diff --git a/boards/obp40_s3_n8r8.json b/boards/obp40_s3_n8r8.json
index 260050c..2ac8c3e 100644
--- a/boards/obp40_s3_n8r8.json
+++ b/boards/obp40_s3_n8r8.json
@@ -19,8 +19,8 @@
     "flash_mode": "qio",
     "hwids": [
       [
-        "0x303A",
-        "0x1001"
+        "0x1A86",
+        "0x7523"
       ]
     ],
     "mcu": "esp32s3",
diff --git a/extra_script.py b/extra_script.py
index ed62c64..b185a93 100644
--- a/extra_script.py
+++ b/extra_script.py
@@ -10,7 +10,7 @@ from datetime import datetime
 import re
 import pprint
 from platformio.project.config import ProjectConfig
-
+from platformio.project.exception import InvalidProjectConfError
 
 Import("env")
 #print(env.Dump())
@@ -104,7 +104,17 @@ def writeFileIfChanged(fileName,data):
     return True    
 
 def mergeConfig(base,other):
+    try:
+        customconfig = env.GetProjectOption("custom_config")
+    except InvalidProjectConfError:
+        customconfig = None
     for bdir in other:
+        if customconfig and os.path.exists(os.path.join(bdir,customconfig)):
+            cname=os.path.join(bdir,customconfig)
+            print("merge custom config {}".format(cname))
+            with open(cname,'rb') as ah:
+                base += json.load(ah)
+            continue   
         cname=os.path.join(bdir,"config.json")
         if os.path.exists(cname):
             print("merge config %s"%cname)
@@ -274,9 +284,9 @@ class Grove:
     def _ss(self,z=False):
         if z:
             return self.name
-        return self.name if self.name is not 'Z' else ''
+        return self.name if self.name != 'Z' else ''
     def _suffix(self):
-        return '_'+self.name if self.name is not 'Z' else ''
+        return '_'+self.name if self.name != 'Z' else ''
     def replace(self,line):
         if line is None:
             return line
diff --git a/extra_script.py.old b/extra_script.py.old
new file mode 100644
index 0000000..ed62c64
--- /dev/null
+++ b/extra_script.py.old
@@ -0,0 +1,518 @@
+print("running extra...")
+import gzip
+import shutil
+import os
+import sys
+import inspect
+import json
+import glob
+from datetime import datetime
+import re
+import pprint
+from platformio.project.config import ProjectConfig
+
+
+Import("env")
+#print(env.Dump())
+OWN_FILE="extra_script.py"
+GEN_DIR='lib/generated'
+CFG_FILE='web/config.json'
+XDR_FILE='web/xdrconfig.json'
+INDEXJS="index.js"
+INDEXCSS="index.css"
+CFG_INCLUDE='GwConfigDefinitions.h'
+CFG_INCLUDE_IMPL='GwConfigDefImpl.h'
+XDR_INCLUDE='GwXdrTypeMappings.h'
+TASK_INCLUDE='GwUserTasks.h'
+GROVE_CONFIG="GwM5GroveGen.h"
+GROVE_CONFIG_IN="lib/hardware/GwM5Grove.in"
+EMBEDDED_INCLUDE="GwEmbeddedFiles.h"
+
+def getEmbeddedFiles(env):
+    rt=[]
+    efiles=env.GetProjectOption("board_build.embed_files")
+    for f in efiles.split("\n"):
+        if f == '':
+            continue
+        rt.append(f)
+    return rt  
+
+def basePath():
+    #see: https://stackoverflow.com/questions/16771894/python-nameerror-global-name-file-is-not-defined
+    return os.path.dirname(inspect.getfile(lambda: None))
+
+def outPath():
+    return os.path.join(basePath(),GEN_DIR)
+def checkDir():
+    dn=outPath()
+    if not os.path.exists(dn):
+        os.makedirs(dn)
+    if not os.path.isdir(dn):
+        print("unable to create %s"%dn)
+        return False
+    return True    
+
+def isCurrent(infile,outfile):
+    if os.path.exists(outfile):
+        otime=os.path.getmtime(outfile)
+        itime=os.path.getmtime(infile)
+        if (otime >= itime):
+            own=os.path.join(basePath(),OWN_FILE)
+            if os.path.exists(own):
+                owntime=os.path.getmtime(own)
+                if owntime > otime:
+                    return False
+            print("%s is newer then %s, no need to recreate"%(outfile,infile))
+            return True
+    return False        
+def compressFile(inFile,outfile):
+    if isCurrent(inFile,outfile):
+        return
+    print("compressing %s"%inFile)
+    with open(inFile, 'rb') as f_in:
+        with gzip.open(outfile, 'wb') as f_out:
+            shutil.copyfileobj(f_in, f_out)
+
+def generateFile(infile,outfile,callback,inMode='rb',outMode='w'):
+    if isCurrent(infile,outfile):
+        return
+    print("creating %s"%outfile)
+    oh=None
+    with open(infile,inMode) as ch:
+        with open(outfile,outMode) as oh:
+            try:
+                callback(ch,oh,inFile=infile)
+                oh.close()
+            except Exception as e:
+                try:
+                    oh.close()
+                except:
+                    pass
+                os.unlink(outfile)
+                raise
+
+def writeFileIfChanged(fileName,data):
+    if os.path.exists(fileName):
+        with open(fileName,"r") as ih:
+            old=ih.read()
+            ih.close()
+            if old == data:
+                return False
+    print("#generating %s"%fileName)
+    with open(fileName,"w") as oh:
+        oh.write(data)
+    return True    
+
+def mergeConfig(base,other):
+    for bdir in other:
+        cname=os.path.join(bdir,"config.json")
+        if os.path.exists(cname):
+            print("merge config %s"%cname)
+            with open(cname,'rb') as ah:
+                merge=json.load(ah)
+                base=base+merge
+    return base
+
+def replaceTexts(data,replacements):
+    if replacements is None:
+        return data
+    if isinstance(data,str):
+        for k,v in replacements.items():
+            data=data.replace("$"+k,str(v))
+        return data
+    if isinstance(data,list):
+        rt=[]
+        for e in data:
+            rt.append(replaceTexts(e,replacements))
+        return rt
+    if isinstance(data,dict):   
+        rt={} 
+        for k,v in data.items():
+            rt[replaceTexts(k,replacements)]=replaceTexts(v,replacements)
+        return rt
+    return data
+def expandConfig(config):
+    rt=[]
+    for item in config:
+        type=item.get('type')
+        if type != 'array':
+            rt.append(item)
+            continue
+        replacements=item.get('replace')
+        children=item.get('children')
+        name=item.get('name')
+        if name is None:
+            name="#unknown#"
+        if not isinstance(replacements,list):
+            raise Exception("missing replacements at array %s"%name)
+        for replace in replacements:
+            if children is not None:
+                for c in children:
+                    rt.append(replaceTexts(c,replace))
+    return rt
+
+def generateMergedConfig(inFile,outFile,addDirs=[]):
+    if not os.path.exists(inFile):
+        raise Exception("unable to read cfg file %s"%inFile)
+    data=""
+    with open(inFile,'rb') as ch:    
+        config=json.load(ch)
+        config=mergeConfig(config,addDirs)
+        config=expandConfig(config)
+        data=json.dumps(config,indent=2)
+        writeFileIfChanged(outFile,data)
+
+def generateCfg(inFile,outFile,impl):
+    if not os.path.exists(inFile):
+        raise Exception("unable to read cfg file %s"%inFile)
+    data=""
+    with open(inFile,'rb') as ch:    
+        config=json.load(ch)     
+        data+="//generated from %s\n"%inFile
+        l=len(config)
+        idx=0
+        if not impl:
+            data+='#include "GwConfigItem.h"\n'
+            data+='class GwConfigDefinitions{\n'
+            data+='  public:\n'
+            data+='  int getNumConfig() const{return %d;}\n'%(l)
+            for item in config:
+                n=item.get('name')
+                if n is None:
+                    continue
+                if len(n) > 15:
+                    raise Exception("%s: config names must be max 15 caracters"%n)
+                data+='  static constexpr const char* %s="%s";\n'%(n,n)
+            data+="};\n"
+        else:
+            data+='void GwConfigHandler::populateConfigs(GwConfigInterface **config){\n'
+            for item in config:
+                name=item.get('name')
+                if name is None:
+                    continue
+                data+='  configs[%d]='%(idx)
+                idx+=1
+                secret="false";
+                if item.get('type') == 'password':
+                    secret="true"
+                data+="     new GwConfigInterface(%s,\"%s\",%s);\n"%(name,item.get('default'),secret)
+            data+='}\n'  
+    writeFileIfChanged(outFile,data)    
+                    
+def labelFilter(label):
+    return re.sub("[^a-zA-Z0-9]","",re.sub("\([0-9]*\)","",label))    
+def generateXdrMappings(fp,oh,inFile=''):
+    jdoc=json.load(fp)
+    oh.write("static GwXDRTypeMapping* typeMappings[]={\n")
+    first=True
+    for cat in jdoc:
+        item=jdoc[cat]
+        cid=item.get('id')
+        if cid is None:
+            continue
+        tc=item.get('type')
+        if tc is not None:
+            if first:
+                first=False
+            else:
+                oh.write(",\n")
+            oh.write("   new GwXDRTypeMapping(%d,0,%d) /*%s*/"%(cid,tc,cat))
+        fields=item.get('fields')
+        if fields is None:
+            continue
+        idx=0
+        for fe in fields:
+            if not isinstance(fe,dict):
+                continue
+            tc=fe.get('t')
+            id=fe.get('v')
+            if id is None:
+                id=idx
+            idx+=1
+            l=fe.get('l') or ''
+            if tc is None or id is None:
+                continue
+            if first:
+                first=False
+            else:
+                oh.write(",\n")
+            oh.write("   new GwXDRTypeMapping(%d,%d,%d) /*%s:%s*/"%(cid,id,tc,cat,l))
+    oh.write("\n")
+    oh.write("};\n")
+    for cat in jdoc:
+        item=jdoc[cat]
+        cid=item.get('id')
+        if cid is None:
+            continue
+        selectors=item.get('selector')
+        if selectors is not None:
+            for selector in selectors:
+                label=selector.get('l')
+                value=selector.get('v')
+                if label is not None and value is not None:
+                    label=labelFilter(label)
+                    define=("GWXDRSEL_%s_%s"%(cat,label)).upper()
+                    oh.write("    #define %s %s\n"%(define,value))
+        fields=item.get('fields')
+        if fields is not None:
+            idx=0
+            for field in fields:
+                v=field.get('v')
+                if v is None:
+                    v=idx
+                else:
+                    v=int(v)
+                label=field.get('l')
+                if v is not None and label is not None:
+                    define=("GWXDRFIELD_%s_%s"%(cat,labelFilter(label))).upper();
+                    oh.write("    #define %s %s\n"%(define,str(v)))
+                idx+=1
+
+class Grove:
+    def __init__(self,name) -> None:
+        self.name=name
+    def _ss(self,z=False):
+        if z:
+            return self.name
+        return self.name if self.name is not 'Z' else ''
+    def _suffix(self):
+        return '_'+self.name if self.name is not 'Z' else ''
+    def replace(self,line):
+        if line is None:
+            return line
+        return line.replace('$G$',self._ss()).replace('$Z$',self._ss(True)).replace('$GS$',self._suffix())
+def generateGroveDefs(inh,outh,inFile=''):
+    GROVES=[Grove('Z'),Grove('A'),Grove('B'),Grove('C')]
+    definition=[]
+    started=False
+    def writeConfig():
+        for grove in GROVES:        
+            for cl in definition:
+                outh.write(grove.replace(cl))
+
+    for line in inh:
+        if re.match(" *#GROVE",line):
+            started=True
+            if len(definition) > 0:
+                writeConfig()
+            definition=[]
+            continue
+        if started:
+            definition.append(line)
+    if len(definition) > 0:
+        writeConfig()
+
+
+
+userTaskDirs=[]
+
+def getUserTaskDirs():
+    rt=[]
+    taskdirs=glob.glob(os.path.join( basePath(),'lib','*task*'))
+    for task in taskdirs:
+        rt.append(task)
+    return rt
+
+def checkAndAdd(file,names,ilist):
+    if not file.endswith('.h'):
+        return
+    match=False
+    for cmp in names:
+        #print("##check %s<->%s"%(f.lower(),cmp))
+        if file.lower() == cmp:
+            match=True
+    if not match:
+        return
+    ilist.append(file) 
+def genereateUserTasks(outfile):
+    includes=[]
+    for task in userTaskDirs:
+        #print("##taskdir=%s"%task)
+        base=os.path.basename(task)
+        includeNames=[base.lower()+".h",'gw'+base.lower()+'.h']
+        for f in os.listdir(task):
+            checkAndAdd(f,includeNames,includes)
+    includeData=""
+    for i in includes:
+        print("#task include %s"%i)
+        includeData+="#include <%s>\n"%i
+    writeFileIfChanged(outfile,includeData)            
+
+def generateEmbedded(elist,outFile):
+    content=""
+    for entry in elist:
+        content+="EMBED_GZ_FILE(\"%s\",%s,\"%s\");\n"%entry
+    writeFileIfChanged(outFile,content)    
+
+def getContentType(fn):
+    if (fn.endswith('.gz')):
+        fn=fn[0:-3]
+    if (fn.endswith('html')):
+        return "text/html"
+    if (fn.endswith('json')):
+        return "application/json"
+    if (fn.endswith('js')):
+        return "text/javascript"
+    if (fn.endswith('css')):    
+        return "text/css"
+    return "application/octet-stream"
+
+
+def getLibs():
+    base=os.path.join(basePath(),"lib")
+    rt=[]
+    for sd in os.listdir(base):
+        if sd == '..':
+            continue
+        if sd == '.':
+            continue
+        fn=os.path.join(base,sd)
+        if os.path.isdir(fn):
+            rt.append(sd)
+    EXTRAS=['generated']
+    for e in EXTRAS:
+        if not e in rt:
+            rt.append(e)
+    return rt
+
+
+
+def joinFiles(target,pattern,dirlist):
+    flist=[]
+    for dir in dirlist:
+            fn=os.path.join(dir,pattern)
+            if os.path.exists(fn):
+                flist.append(fn)
+    current=False
+    if os.path.exists(target):
+        current=True
+        for f in flist:
+            if not isCurrent(f,target):
+                current=False
+                break
+    if current:
+        print("%s is up to date"%target)
+        return
+    print("creating %s"%target)
+    with gzip.open(target,"wb") as oh:
+        for fn in flist:
+            print("adding %s to %s"%(fn,target))
+            with open(fn,"rb") as rh:
+                shutil.copyfileobj(rh,oh)
+    
+
+OWNLIBS=getLibs()+["FS","WiFi"]
+GLOBAL_INCLUDES=[]
+
+def handleDeps(env):
+    #overwrite the GetProjectConfig
+    #to inject all our libs
+    oldGetProjectConfig=env.GetProjectConfig    
+    def GetProjectConfigX(env):        
+        rt=oldGetProjectConfig()
+        cenv="env:"+env['PIOENV']
+        libs=[]
+        for section,options in rt.as_tuple():
+            if section == cenv:
+                for key,values in options:
+                    if key == 'lib_deps':
+                        libs=values
+    
+        mustUpdate=False
+        for lib in OWNLIBS:
+            if not lib in libs:
+                libs.append(lib)
+                mustUpdate=True
+        if mustUpdate:
+            update=[(cenv,[('lib_deps',libs)])]
+            rt.update(update)
+        return rt
+    env.AddMethod(GetProjectConfigX,"GetProjectConfig")
+    #store the list of all includes after we resolved
+    #the dependencies for our main project
+    #we will use them for all compilations afterwards
+    oldLibBuilder=env.ConfigureProjectLibBuilder
+    def ConfigureProjectLibBuilderX(env):
+        global GLOBAL_INCLUDES
+        project=oldLibBuilder()
+        #print("##ConfigureProjectLibBuilderX")
+        #pprint.pprint(project)
+        if project.depbuilders:
+            #print("##depbuilders %s"%",".join(map(lambda x: x.path,project.depbuilders)))
+            for db in project.depbuilders:
+                idirs=db.get_include_dirs()
+                for id in idirs:
+                    if not id in GLOBAL_INCLUDES:
+                        GLOBAL_INCLUDES.append(id)
+        return project
+    env.AddMethod(ConfigureProjectLibBuilderX,"ConfigureProjectLibBuilder")
+    def injectIncludes(env,node):
+        return env.Object(
+            node,
+            CPPPATH=env["CPPPATH"]+GLOBAL_INCLUDES
+        )
+    env.AddBuildMiddleware(injectIncludes)
+
+
+def prebuild(env):
+    global userTaskDirs
+    print("#prebuild running")
+    if not checkDir():
+        sys.exit(1)
+    ldf_mode=env.GetProjectOption("lib_ldf_mode")
+    if ldf_mode == 'off':
+        print("##ldf off - own dependency handling")
+        handleDeps(env)
+    userTaskDirs=getUserTaskDirs()
+    mergedConfig=os.path.join(outPath(),os.path.basename(CFG_FILE))
+    generateMergedConfig(os.path.join(basePath(),CFG_FILE),mergedConfig,userTaskDirs)
+    compressFile(mergedConfig,mergedConfig+".gz")
+    generateCfg(mergedConfig,os.path.join(outPath(),CFG_INCLUDE),False)
+    generateCfg(mergedConfig,os.path.join(outPath(),CFG_INCLUDE_IMPL),True)
+    joinFiles(os.path.join(outPath(),INDEXJS+".gz"),INDEXJS,["web"]+userTaskDirs)
+    joinFiles(os.path.join(outPath(),INDEXCSS+".gz"),INDEXCSS,["web"]+userTaskDirs)
+    embedded=getEmbeddedFiles(env)
+    filedefs=[]
+    for ef in embedded:
+        print("#checking embedded file %s"%ef)
+        (dn,fn)=os.path.split(ef)
+        pureName=fn
+        if pureName.endswith('.gz'):
+            pureName=pureName[0:-3]
+        ct=getContentType(pureName)
+        usname=ef.replace('/','_').replace('.','_')
+        filedefs.append((pureName,usname,ct))
+        inFile=os.path.join(basePath(),"web",pureName)
+        if os.path.exists(inFile):
+            compressFile(inFile,ef)
+        else:
+            print("#WARNING: infile %s for %s not found"%(inFile,ef))
+    generateEmbedded(filedefs,os.path.join(outPath(),EMBEDDED_INCLUDE))
+    genereateUserTasks(os.path.join(outPath(), TASK_INCLUDE))
+    generateFile(os.path.join(basePath(),XDR_FILE),os.path.join(outPath(),XDR_INCLUDE),generateXdrMappings)
+    generateFile(os.path.join(basePath(),GROVE_CONFIG_IN),os.path.join(outPath(),GROVE_CONFIG),generateGroveDefs,inMode='r')
+    version="dev"+datetime.now().strftime("%Y%m%d")
+    env.Append(CPPDEFINES=[('GWDEVVERSION',version)])
+
+def cleangenerated(source, target, env):
+    od=outPath()
+    if os.path.isdir(od):
+        print("#cleaning up %s"%od)
+        for f in os.listdir(od):
+            if f == "." or f == "..":
+                continue
+            fn=os.path.join(od,f)
+            os.unlink(f)
+
+
+print("#prescript...")
+prebuild(env)
+board="PLATFORM_BOARD_%s"%env["BOARD"].replace("-","_").upper()
+print("Board=#%s#"%board)
+print("BuildFlags=%s"%(" ".join(env["BUILD_FLAGS"])))
+env.Append(
+    LINKFLAGS=[ "-u", "custom_app_desc" ],
+    CPPDEFINES=[(board,"1")]
+)
+#script does not run on clean yet - maybe in the future
+env.AddPostAction("clean",cleangenerated)
diff --git a/lib/obp60task/OBP60Extensions.cpp b/lib/obp60task/OBP60Extensions.cpp
index 9f7df24..c589feb 100644
--- a/lib/obp60task/OBP60Extensions.cpp
+++ b/lib/obp60task/OBP60Extensions.cpp
@@ -141,12 +141,12 @@ void deepSleep(CommonData &common){
     getdisplay().print("Sleep Mode");
     getdisplay().setFont(&Ubuntu_Bold8pt7b);
     getdisplay().setCursor(65, 175);
-    getdisplay().print("For wakeup press key and wait 5s");
+    getdisplay().print("To wake up press key and wait 5s");
     getdisplay().nextPage();                // Update display contents
     getdisplay().powerOff();                // Display power off
     setPortPin(OBP_POWER_50, false);        // Power off ePaper display
     // Stop system
-    esp_deep_sleep_start();             // Deep Sleep with weakup via touch pin
+    esp_deep_sleep_start();                 // Deep Sleep with weakup via touch pin
 }
 #endif
 #ifdef BOARD_OBP40S3
@@ -166,7 +166,7 @@ void deepSleep(CommonData &common){
     getdisplay().print("Sleep Mode");
     getdisplay().setFont(&Ubuntu_Bold8pt7b);
     getdisplay().setCursor(65, 175);
-    getdisplay().print("For wakeup press wheel and wait 5s");
+    getdisplay().print("To wake up press wheel and wait 5s");
     getdisplay().nextPage();                // Partial update
     getdisplay().powerOff();                // Display power off
     setPortPin(OBP_POWER_EPD, false);       // Power off ePaper display
@@ -341,13 +341,9 @@ void displayHeader(CommonData &commonData, GwApi::BoatValue *date, GwApi::BoatVa
     static unsigned long tcpClTxOld = 0;
     static unsigned long n2kRxOld = 0;
     static unsigned long n2kTxOld = 0;
-    int textcolor = GxEPD_BLACK;
 
     if(commonData.config->getBool(commonData.config->statusLine) == true){
 
-        // Header separator line (optional)
-        // getdisplay().drawLine(0, 19, 399, 19, commonData.fgcolor);
-
         // Show status info
         getdisplay().setTextColor(commonData.fgcolor);
         getdisplay().setFont(&Ubuntu_Bold8pt7b);
@@ -392,13 +388,37 @@ void displayHeader(CommonData &commonData, GwApi::BoatValue *date, GwApi::BoatVa
             getdisplay().drawXBitmap(166, 1, swipe_bits, swipe_width, swipe_height, commonData.fgcolor);
         }
 #endif
+#ifdef LIPO_ACCU_1200
+        if (commonData.data.BatteryChargeStatus == 1) {
+             getdisplay().drawXBitmap(170, 1, battery_loading_bits, battery_width, battery_height, commonData.fgcolor);
+        } else {
+#ifdef VOLTAGE_SENSOR
+            if (commonData.data.batteryLevelLiPo < 10) {
+                getdisplay().drawXBitmap(170, 1, battery_0_bits, battery_width, battery_height, commonData.fgcolor);
+            } else if (commonData.data.batteryLevelLiPo < 25) {
+                getdisplay().drawXBitmap(170, 1, battery_25_bits, battery_width, battery_height, commonData.fgcolor);
+            } else if (commonData.data.batteryLevelLiPo < 50) {
+                getdisplay().drawXBitmap(170, 1, battery_50_bits, battery_width, battery_height, commonData.fgcolor);
+            } else if (commonData.data.batteryLevelLiPo < 75) {
+                getdisplay().drawXBitmap(170, 1, battery_75_bits, battery_width, battery_height, commonData.fgcolor);
+            } else {
+                getdisplay().drawXBitmap(170, 1, battery_100_bits, battery_width, battery_height, commonData.fgcolor);
+            }
+#endif // VOLTAGE_SENSOR
+        }
+#endif // LIPO_ACCU_1200
 
-        // Heartbeat as dot
-        getdisplay().setTextColor(commonData.fgcolor);
-        getdisplay().setFont(&Ubuntu_Bold32pt7b);
-        getdisplay().setCursor(205, 14);
-        getdisplay().print(heartbeat ? "." : " ");
-        heartbeat = !heartbeat; 
+        // Heartbeat as page number
+        if (heartbeat) {
+            getdisplay().setTextColor(commonData.bgcolor);
+            getdisplay().fillRect(201, 0, 23, 19, commonData.fgcolor);
+        } else {
+            getdisplay().setTextColor(commonData.fgcolor);
+            getdisplay().drawRect(201, 0, 23, 19, commonData.fgcolor);
+        }
+        getdisplay().setFont(&Ubuntu_Bold8pt7b);
+        drawTextCenter(211, 9, String(commonData.data.actpage));
+        heartbeat = !heartbeat;
 
         // Date and time
         getdisplay().setTextColor(commonData.fgcolor);
@@ -442,17 +462,16 @@ void displayFooter(CommonData &commonData) {
         // horizontal elements
         const uint16_t top = 280;
         const uint16_t bottom = 299;
+        // horizontal stub lines
         getdisplay().drawLine(commonData.keydata[0].x, top, commonData.keydata[0].x+10, top, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[1].x-10, top, commonData.keydata[1].x+10, top, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[2].x-10, top, commonData.keydata[2].x+10, top, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[4].x-10, top, commonData.keydata[4].x+10, top, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[5].x-10, top, commonData.keydata[5].x+10, top, commonData.fgcolor);
+        for (int i = 1; i <= 5; i++) {
+            getdisplay().drawLine(commonData.keydata[i].x-10, top, commonData.keydata[i].x+10, top, commonData.fgcolor);
+        }
         getdisplay().drawLine(commonData.keydata[5].x + commonData.keydata[5].w - 10, top, commonData.keydata[5].x + commonData.keydata[5].w + 1, top, commonData.fgcolor);
         // vertical key separators
-        getdisplay().drawLine(commonData.keydata[0].x + commonData.keydata[0].w, top, commonData.keydata[0].x + commonData.keydata[0].w, bottom, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[1].x + commonData.keydata[1].w, top, commonData.keydata[1].x + commonData.keydata[1].w, bottom, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[3].x + commonData.keydata[3].w, top, commonData.keydata[3].x + commonData.keydata[3].w, bottom, commonData.fgcolor);
-        getdisplay().drawLine(commonData.keydata[4].x + commonData.keydata[4].w, top, commonData.keydata[4].x + commonData.keydata[4].w, bottom, commonData.fgcolor);
+        for (int i = 0; i <= 4; i++) {
+            getdisplay().drawLine(commonData.keydata[i].x + commonData.keydata[i].w, top, commonData.keydata[i].x + commonData.keydata[i].w, bottom, commonData.fgcolor);
+        }
         for (int i = 0; i < 6; i++) {
             uint16_t x, y;
             if (commonData.keydata[i].label.length() > 0) {
@@ -476,9 +495,6 @@ void displayFooter(CommonData &commonData) {
                 }
             }
         }
-        // Current page number in a small box
-        getdisplay().drawRect(190, 280, 23, 19, commonData.fgcolor);
-        drawTextCenter(200, 289, String(commonData.data.actpage));
     } else {
         getdisplay().setCursor(65, 295);
         getdisplay().print("Press 1 and 6 fast to unlock keys");
diff --git a/lib/obp60task/OBP60Extensions.h b/lib/obp60task/OBP60Extensions.h
index b6f653f..4118623 100644
--- a/lib/obp60task/OBP60Extensions.h
+++ b/lib/obp60task/OBP60Extensions.h
@@ -100,8 +100,8 @@ void displayFooter(CommonData &commonData);
 SunData calcSunsetSunrise(GwApi *api, double time, double date, double latitude, double longitude, double timezone); // Calulate sunset and sunrise
 
 void batteryGraphic(uint x, uint y, float percent, int pcolor, int bcolor); // Battery graphic with fill level
-void solarGraphic(uint x, uint y, int pcolor, int bcolor);                  // Solar graphic with fill level
-void generatorGraphic(uint x, uint y, int pcolor, int bcolor);              // Generator graphic with fill level
+void solarGraphic(uint x, uint y, int pcolor, int bcolor);                  // Solar graphic
+void generatorGraphic(uint x, uint y, int pcolor, int bcolor);              // Generator graphic
 void startLedTask(GwApi *api);
 
 void doImageRequest(GwApi *api, int *pageno, const PageStruct pages[MAX_PAGE_NUMBER], AsyncWebServerRequest *request);
@@ -160,6 +160,46 @@ static std::map<String, unsigned char *> iconmap = {
     {"AP", ap_bits}
 };
 
+// Battery
+#define battery_width 24
+#define battery_height 16
+
+static unsigned char battery_0_bits[] = {
+   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xff, 0x0f, 0xff, 0xff, 0x1f,
+   0x03, 0x00, 0x18, 0x03, 0x00, 0x78, 0x03, 0x00, 0xf8, 0x03, 0x00, 0xd8,
+   0x03, 0x00, 0xd8, 0x03, 0x00, 0xd8, 0x03, 0x00, 0xf8, 0x03, 0x00, 0x78,
+   0x03, 0x00, 0x18, 0xff, 0xff, 0x1f, 0xfe, 0xff, 0x0f, 0x00, 0x00, 0x00 };
+
+static unsigned char battery_25_bits[] = {
+   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xff, 0x0f, 0xff, 0xff, 0x1f,
+   0x03, 0x00, 0x18, 0x3b, 0x00, 0x78, 0x3b, 0x00, 0xf8, 0x3b, 0x00, 0xd8,
+   0x3b, 0x00, 0xd8, 0x3b, 0x00, 0xd8, 0x3b, 0x00, 0xf8, 0x3b, 0x00, 0x78,
+   0x03, 0x00, 0x18, 0xff, 0xff, 0x1f, 0xfe, 0xff, 0x0f, 0x00, 0x00, 0x00 };
+
+static unsigned char battery_50_bits[] = {
+   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xff, 0x0f, 0xff, 0xff, 0x1f,
+   0x03, 0x00, 0x18, 0xbb, 0x03, 0x78, 0xbb, 0x03, 0xf8, 0xbb, 0x03, 0xd8,
+   0xbb, 0x03, 0xd8, 0xbb, 0x03, 0xd8, 0xbb, 0x03, 0xf8, 0xbb, 0x03, 0x78,
+   0x03, 0x00, 0x18, 0xff, 0xff, 0x1f, 0xfe, 0xff, 0x0f, 0x00, 0x00, 0x00 };
+
+static unsigned char battery_75_bits[] = {
+   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xff, 0x0f, 0xff, 0xff, 0x1f,
+   0x03, 0x00, 0x18, 0xbb, 0x3b, 0x78, 0xbb, 0x3b, 0xf8, 0xbb, 0x3b, 0xd8,
+   0xbb, 0x3b, 0xd8, 0xbb, 0x3b, 0xd8, 0xbb, 0x3b, 0xf8, 0xbb, 0x3b, 0x78,
+   0x03, 0x00, 0x18, 0xff, 0xff, 0x1f, 0xfe, 0xff, 0x0f, 0x00, 0x00, 0x00 };
+
+static unsigned char battery_100_bits[] = {
+   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xff, 0x0f, 0xff, 0xff, 0x1f,
+   0x03, 0x00, 0x18, 0xbb, 0xbb, 0x7b, 0xbb, 0xbb, 0xfb, 0xbb, 0xbb, 0xdb,
+   0xbb, 0xbb, 0xdb, 0xbb, 0xbb, 0xdb, 0xbb, 0xbb, 0xfb, 0xbb, 0xbb, 0x7b,
+   0x03, 0x00, 0x18, 0xff, 0xff, 0x1f, 0xfe, 0xff, 0x0f, 0x00, 0x00, 0x00 };
+
+static unsigned char battery_loading_bits[] = {
+   0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0xfe, 0xe4, 0x0f, 0xff, 0xec, 0x1f,
+   0x03, 0x08, 0x18, 0x03, 0x18, 0x78, 0x03, 0x30, 0xf8, 0x83, 0x3f, 0xd8,
+   0x03, 0x7f, 0xd8, 0x03, 0x03, 0xd8, 0x03, 0x06, 0xf8, 0x03, 0x04, 0x78,
+   0x03, 0x0c, 0x18, 0xff, 0xcb, 0x1f, 0xfe, 0xd3, 0x0f, 0x00, 0x10, 0x00 };
+
 // Other symbols
 #define swipe_width 24
 #define swipe_height 16
diff --git a/lib/obp60task/OBP60Keypad.h b/lib/obp60task/OBP60Keypad.h
index 937f44e..eafe3a2 100644
--- a/lib/obp60task/OBP60Keypad.h
+++ b/lib/obp60task/OBP60Keypad.h
@@ -277,8 +277,8 @@ void initKeys(CommonData &commonData) {
         starttime = millis();   // Start key pressed
         keycodeold = keycode;
       }
-      // If key pressed longer than 200ms
-      if(millis() > starttime + 200 && keycode == keycodeold) {
+      // If key pressed longer than 100ms
+      if(millis() > starttime + 100 && keycode == keycodeold) {
         if (use_syspage and keycode == 3) {
             keystatus = 12;
         } else {
diff --git a/lib/obp60task/OBPSensorTask.cpp b/lib/obp60task/OBPSensorTask.cpp
index 99071ab..445fb21 100644
--- a/lib/obp60task/OBPSensorTask.cpp
+++ b/lib/obp60task/OBPSensorTask.cpp
@@ -88,8 +88,16 @@ void sensorTask(void *param){
     double voffset = (api->getConfig()->getConfigItem(api->getConfig()->vOffset,true)->asString()).toFloat();
     double vslope = (api->getConfig()->getConfigItem(api->getConfig()->vSlope,true)->asString()).toFloat();
     if(String(powsensor1) == "off"){
-        sensors.batteryVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.17) * 20;   // Vin = 1/20
-        sensors.batteryVoltage = sensors.batteryVoltage * vslope + voffset; // Calibration
+        #ifdef VOLTAGE_SENSOR
+        float rawVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.53) * 2;   // Vin = 1/2 for OBP40
+        #else
+        float rawVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.17) * 20;   // Vin = 1/20 for OBP60    
+        #endif
+        sensors.batteryVoltage = rawVoltage * vslope + voffset; // Calibration
+        #ifdef LIPO_ACCU_1200
+        sensors.BatteryChargeStatus = 0;    // Set to discharging
+        sensors.batteryLevelLiPo = 0;       // Level 0...100%
+        #endif
         sensors.batteryCurrent = 0;
         sensors.batteryPower = 0;
         // Fill average arrays with start values
@@ -459,19 +467,61 @@ void sensorTask(void *param){
         // Send supply voltage value all 1s
         if(millis() > starttime5 + 1000 && String(powsensor1) == "off"){
             starttime5 = millis();
-            sensors.batteryVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.17) * 20;   // Vin = 1/20
-            sensors.batteryVoltage = sensors.batteryVoltage * vslope + voffset; // Calibration
+            #ifdef VOLTAGE_SENSOR
+            float rawVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.53) * 2;   // Vin = 1/2 for OBP40
+            #else
+            float rawVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.17) * 20;   // Vin = 1/20 for OBP60    
+            #endif
+            sensors.batteryVoltage = rawVoltage * vslope + voffset; // Calibration
             // Save new data in average array
             batV.reading(int(sensors.batteryVoltage * 100));
             // Calculate the average values for different time lines from integer values
             sensors.batteryVoltage10 = batV.getAvg(10) / 100.0;
             sensors.batteryVoltage60 = batV.getAvg(60) / 100.0;
             sensors.batteryVoltage300 = batV.getAvg(300) / 100.0;
+            #if defined LIPO_ACCU_1200 && defined VOLTAGE_SENSOR
+            // Polynomfit for LiPo capacity calculation for 3,7V LiPo accus, 0...100%
+            sensors.batteryLevelLiPo = sensors.batteryVoltage60 * 203.8312 -738.1635;
+            // Limiter
+            if(sensors.batteryLevelLiPo > 100){
+                sensors.batteryLevelLiPo = 100;
+            }
+            if(sensors.batteryLevelLiPo < 0){
+                sensors.batteryLevelLiPo = 0;
+            }
+            // Charging detection
+            float deltaV = sensors.batteryVoltage - sensors.batteryVoltage10;
+            // Higher limits for lower voltages
+            if(sensors.batteryVoltage10 < 4.0){
+                if(deltaV > 0.045 && deltaV < 4.15){
+                    sensors.BatteryChargeStatus = 1;    // Charging active
+                }
+                if(deltaV < -0.04 || deltaV >= 4.15){   // Charging stops by grater than 4,15V
+                    sensors.BatteryChargeStatus = 0;    // Discharging
+                }
+            }
+            // Lower limits for higher voltages
+            else{
+                if(deltaV > 0.03 && deltaV < 4.15){
+                    sensors.BatteryChargeStatus = 1;    // Charging active
+                }
+                if(deltaV < -0.03 || deltaV >= 4.15){   // Charging stops by grater than 4,15V
+                    sensors.BatteryChargeStatus = 0;    // Discharging
+                }
+            }
+            // Send to NMEA200 bus as instance 10
+            if(!isnan(sensors.batteryVoltage)){
+                SetN2kDCBatStatus(N2kMsg, 10, sensors.batteryVoltage, N2kDoubleNA, N2kDoubleNA, 0);
+                api->sendN2kMessage(N2kMsg);
+            }
+            #endif
+            #ifdef BOARD_OBP60S3
             // Send to NMEA200 bus
             if(!isnan(sensors.batteryVoltage)){
                 SetN2kDCBatStatus(N2kMsg, 0, sensors.batteryVoltage, N2kDoubleNA, N2kDoubleNA, 1);
                 api->sendN2kMessage(N2kMsg);
             }
+            #endif
         }
 
         // Send data from environment sensor all 2s
diff --git a/lib/obp60task/PageVoltage.cpp b/lib/obp60task/PageVoltage.cpp
index d05c903..c98bc96 100644
--- a/lib/obp60task/PageVoltage.cpp
+++ b/lib/obp60task/PageVoltage.cpp
@@ -205,6 +205,18 @@ public:
             getdisplay().setCursor(20, 100);
             getdisplay().print(name1);                           // Value name
 
+            #if defined BOARD_OBP40S3 && defined LIPO_ACCU_1200 && defined VOLTAGE_SENSOR
+            // Show charge status
+            getdisplay().setFont(&Ubuntu_Bold8pt7b);
+            getdisplay().setCursor(185, 100);
+            if(commonData->data.BatteryChargeStatus == true){
+                getdisplay().print("Charge");
+            }
+            else{
+                getdisplay().print("Discharge");
+            }
+            #endif
+
             // Show unit
             getdisplay().setFont(&Ubuntu_Bold20pt7b);
             getdisplay().setCursor(270, 100);
@@ -213,7 +225,12 @@ public:
             // Show battery type
             getdisplay().setFont(&Ubuntu_Bold8pt7b);
             getdisplay().setCursor(295, 100);
+            #ifdef BOARD_OBP60S3
             getdisplay().print(batType);
+            #endif
+            #if defined BOARD_OBP40S3 && defined LIPO_ACCU_1200 && defined VOLTAGE_SENSOR
+            getdisplay().print("LiPo");
+            #endif
 
             // Show average settings
             printAvg(average, 320, 84, true);
diff --git a/lib/obp60task/Pagedata.h b/lib/obp60task/Pagedata.h
index b385b5c..b979b57 100644
--- a/lib/obp60task/Pagedata.h
+++ b/lib/obp60task/Pagedata.h
@@ -31,6 +31,8 @@ typedef struct{
   double batteryVoltage300 = 0; // Sliding average over 300 values
   double batteryCurrent300 = 0;
   double batteryPower300 = 0;
+  double batteryLevelLiPo = 0;  // Battery level for OBP40 LiPo accu
+  int BatteryChargeStatus = 0;  // LiPo charge status: 0 = discharge, 1 = loading activ
   double solarVoltage = 0;
   double solarCurrent = 0;
   double solarPower = 0;
@@ -93,6 +95,7 @@ typedef struct{
   uint16_t fgcolor;
   uint16_t bgcolor;
   bool keylock = false;
+  String powermode;
 } CommonData;
 
 //a base class that all pages must inherit from
@@ -110,7 +113,7 @@ class Page{
         commonData->keydata[2].label = "#LEFT";
         commonData->keydata[3].label = "#RIGHT";
         commonData->keydata[4].label = "";
-        if (commonData->backlight.mode == KEY) {
+        if ((commonData->backlight.mode == KEY) && !(commonData->powermode == "Min Power")) {
             commonData->keydata[5].label = "ILUM";
         } else {
             commonData->keydata[5].label = "";
diff --git a/lib/obp60task/config_obp40.json b/lib/obp60task/config_obp40.json
index 3a4b6bf..888c746 100644
--- a/lib/obp60task/config_obp40.json
+++ b/lib/obp60task/config_obp40.json
@@ -609,10 +609,10 @@
         "label": "Undervoltage",
         "type": "boolean",
         "default": "false",
-        "description": "Switch off device if voltage drops below 9V [on|off]",
+        "description": "Switch off device if LiPo voltage drops below 3.65V [on|off]",
         "category": "OBP40 Hardware",
         "capabilities": {
-            "obp40": "false"
+            "obp40":"true"
         }
     },
     {
diff --git a/lib/obp60task/obp60task.cpp b/lib/obp60task/obp60task.cpp
index a55e62b..1b4b936 100644
--- a/lib/obp60task/obp60task.cpp
+++ b/lib/obp60task/obp60task.cpp
@@ -78,7 +78,7 @@ void OBP60Init(GwApi *api){
     }
 
     #ifdef BOARD_OBP40S3
-    //String sdcard = config->getConfigItem(config->useSDCard, true)->asString();
+//    String sdcard = config->getConfigItem(config->useSDCard, true)->asString();
     String sdcard = "on";
     if (sdcard == "on") {
         SPIClass SD_SPI = SPIClass(HSPI);
@@ -310,12 +310,39 @@ void registerAllPages(PageList &list){
 // Undervoltage detection for shutdown display
 void underVoltageDetection(GwApi *api, CommonData &common){
     // Read settings
-    float vslope = uint(api->getConfig()->getConfigItem(api->getConfig()->vSlope,true)->asFloat());
-    float voffset = uint(api->getConfig()->getConfigItem(api->getConfig()->vOffset,true)->asFloat());
+    double voffset = (api->getConfig()->getConfigItem(api->getConfig()->vOffset,true)->asString()).toFloat();
+    double vslope = (api->getConfig()->getConfigItem(api->getConfig()->vSlope,true)->asString()).toFloat();
     // Read supply voltage
-    float actVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.17) * 20;   // V = 1/20 * Vin
-    actVoltage = actVoltage * vslope + voffset;
-    if(actVoltage < MIN_VOLTAGE){
+    #if defined VOLTAGE_SENSOR && defined LIPO_ACCU_1200
+    float actVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.53) * 2;   // Vin = 1/2 for OBP40
+    float minVoltage = 3.65;  // Absolut minimum volatge for 3,7V LiPo accu
+    #else
+    float actVoltage = (float(analogRead(OBP_ANALOG0)) * 3.3 / 4096 + 0.17) * 20;   // Vin = 1/20 for OBP60
+    float minVoltage = MIN_VOLTAGE;
+    #endif
+    double calVoltage = actVoltage * vslope + voffset;  // Calibration
+    if(calVoltage < minVoltage){
+        #if defined VOLTAGE_SENSOR && defined LIPO_ACCU_1200
+        // Switch off all power lines
+        setPortPin(OBP_BACKLIGHT_LED, false);   // Backlight Off
+        setFlashLED(false);                     // Flash LED Off            
+        buzzer(TONE4, 20);                      // Buzzer tone 4kHz 20ms
+        // Shutdown EInk display
+        getdisplay().setFullWindow();           // Set full Refresh
+        //getdisplay().setPartialWindow(0, 0, getdisplay().width(), getdisplay().height()); // Set partial update
+        getdisplay().fillScreen(common.bgcolor);// Clear screen
+        getdisplay().setTextColor(common.fgcolor);
+        getdisplay().setFont(&Ubuntu_Bold20pt7b);
+        getdisplay().setCursor(65, 150);
+        getdisplay().print("Undervoltage");
+        getdisplay().setFont(&Ubuntu_Bold8pt7b);
+        getdisplay().setCursor(65, 175);
+        getdisplay().print("Charge battery and restart system");
+        getdisplay().nextPage();                // Partial update
+        getdisplay().powerOff();                // Display power off
+        setPortPin(OBP_POWER_EPD, false);       // Power off ePaper display
+        setPortPin(OBP_POWER_SD, false);        // Power off SD card
+        #else
         // Switch off all power lines
         setPortPin(OBP_BACKLIGHT_LED, false);   // Backlight Off
         setFlashLED(false);                     // Flash LED Off            
@@ -323,13 +350,17 @@ void underVoltageDetection(GwApi *api, CommonData &common){
         setPortPin(OBP_POWER_50, false);        // Power rail 5.0V Off
         // Shutdown EInk display
         getdisplay().setPartialWindow(0, 0, getdisplay().width(), getdisplay().height()); // Set partial update
-        getdisplay().fillScreen(common.bgcolor);       // Clear screen
+        getdisplay().fillScreen(common.bgcolor);// Clear screen
         getdisplay().setTextColor(common.fgcolor);
         getdisplay().setFont(&Ubuntu_Bold20pt7b);
         getdisplay().setCursor(65, 150);
         getdisplay().print("Undervoltage");
+        getdisplay().setFont(&Ubuntu_Bold8pt7b);
+        getdisplay().setCursor(65, 175);
+        getdisplay().print("To wake up repower system");
         getdisplay().nextPage();                // Partial update
         getdisplay().powerOff();                // Display power off
+        #endif
         // Stop system
         while(true){
             esp_deep_sleep_start();             // Deep Sleep without weakup. Weakup only after power cycle (restart).
@@ -382,7 +413,8 @@ void OBP60Task(GwApi *api){
     String fastrefresh = api->getConfig()->getConfigItem(api->getConfig()->fastRefresh,true)->asString();
     uint fullrefreshtime = uint(api->getConfig()->getConfigItem(api->getConfig()->fullRefreshTime,true)->asInt());
     #ifdef BOARD_OBP40S3
-    bool syspage_enabled = config->getBool(config->systemPage);
+//    bool syspage_enabled = config->getBool(config->systemPage);
+    bool syspage_enabled = true;
     #endif
 
     #ifdef DISPLAY_GDEY042T81
@@ -523,6 +555,7 @@ void OBP60Task(GwApi *api){
     commonData.backlight.mode = backlightMapping(config->getConfigItem(config->backlight,true)->asString());
     commonData.backlight.color = colorMapping(config->getConfigItem(config->blColor,true)->asString());
     commonData.backlight.brightness = 2.55 * uint(config->getConfigItem(config->blBrightness,true)->asInt());
+    commonData.powermode = api->getConfig()->getConfigItem(api->getConfig()->powerMode,true)->asString();
 
     bool uvoltage = api->getConfig()->getConfigItem(api->getConfig()->underVoltage,true)->asBoolean();
     String cpuspeed = api->getConfig()->getConfigItem(api->getConfig()->cpuSpeed,true)->asString();
diff --git a/lib/obp60task/platformio.ini b/lib/obp60task/platformio.ini
index da78f39..2259b61 100644
--- a/lib/obp60task/platformio.ini
+++ b/lib/obp60task/platformio.ini
@@ -2,7 +2,10 @@
 #if you want a pio run to only build
 #your special environments you can set this here
 #by uncommenting the next line
-default_envs = obp60_s3
+
+default_envs = 
+    obp60_s3
+    obp40_s3
 
 [env:obp60_s3]
 platform = espressif32@6.8.1
@@ -91,6 +94,8 @@ build_flags=
     -D DISABLE_DIAGNOSTIC_OUTPUT    #Disable diagnostic output for GxEPD2 lib
     -D BOARD_OBP40S3                #Board OBP40 V1.0 with ESP32S3 SKU:DIE07300S (CrowPanel 4.2)
     -D DISPLAY_GDEY042T81           #new E-Ink display from Waveshare, R10 2.2 ohm
+    -D LIPO_ACCU_1200               #Hardware extension, LiPo accu 3,7V 1200mAh
+    -D VOLTAGE_SENSOR               #Hardware extension, LiPo voltage sensor with two resistors 
     ${env.build_flags}
 upload_port = /dev/ttyUSB0          #OBP40 download via external USB/Serail converter
 upload_protocol = esptool           #firmware upload via USB OTG seriell, by first upload need to set the ESP32-S3 in the upload mode with shortcut GND to Pin27