diff --git a/lib/iictask/GwBMP280.cpp b/lib/iictask/GwBMP280.cpp
index c1b1729..c295cd9 100644
--- a/lib/iictask/GwBMP280.cpp
+++ b/lib/iictask/GwBMP280.cpp
@@ -33,8 +33,8 @@ class BMP280Config : public IICSensorBase{
     float prOff=0;
     Adafruit_BMP280 *device=nullptr;
     uint32_t sensorId=-1;
-    BMP280Config(GwApi * api, const String &prfx):SensorBase(TYPE,api,prfx){
-        }
+    BMP280Config(GwApi * api, const String &prfx):IICSensorBase(TYPE,api,prfx){
+    }
     virtual bool isActive(){return prAct||tmAct;}
     virtual bool initDevice(GwApi *api,TwoWire *wire){
         GwLog *logger=api->getLogger();  
diff --git a/lib/iictask/GwIicSensors.h b/lib/iictask/GwIicSensors.h
index bade5d0..4937daa 100644
--- a/lib/iictask/GwIicSensors.h
+++ b/lib/iictask/GwIicSensors.h
@@ -11,9 +11,9 @@
     class TwoWire;
 #endif
 
-using BusType=TwoWire;
-using IICSensorList=SensorList<BusType>;
-using IICSensorBase=SensorBase<BusType>;
+using BUSTYPE=TwoWire;
+using IICSensorList=SensorList;
+using IICSensorBase=SensorTemplate<BUSTYPE,SensorBase::IIC>;
 
 
 template <class CFG>
diff --git a/lib/iictask/GwIicTask.cpp b/lib/iictask/GwIicTask.cpp
index 22a7167..81dc0cc 100644
--- a/lib/iictask/GwIicTask.cpp
+++ b/lib/iictask/GwIicTask.cpp
@@ -184,8 +184,8 @@ void runIicTask(GwApi *api){
     bool runLoop=false;
     GwIntervalRunner timers;
     int counterId=api->addCounter("iicsensors");
-    for (auto it=sensors.begin();it != sensors.end();it++){
-        IICSensorBase *cfg=*it;
+    for (auto &&cfg:sensors){
+        if (cfg->busType != SensorBase::IIC) continue;
         auto bus=buses.find(cfg->busId);
         if (! cfg->isActive()) continue;
         if (bus == buses.end()){
diff --git a/lib/sensors/GwSensor.h b/lib/sensors/GwSensor.h
index da9b560..1f85d3b 100644
--- a/lib/sensors/GwSensor.h
+++ b/lib/sensors/GwSensor.h
@@ -16,9 +16,14 @@
 #define _GWSENSORS_H
 #include "GwApi.h"
 #include "GwLog.h"
-template<typename BUS>
 class SensorBase{
     public:
+    using BusType=enum{
+        IIC=0,
+        SPI=1,
+        UNKNOWN=-1
+    };
+    BusType busType=BusType::UNKNOWN;
     int busId=0;
     int iid=99; //N2K instanceId
     int addr=-1;
@@ -27,25 +32,41 @@ class SensorBase{
     long intv=0;
     bool ok=false;
     virtual void readConfig(GwConfigHandler *cfg)=0;
-    SensorBase(const String &tn,GwApi *api,const String &prfx):type(tn),prefix(prfx){
+    SensorBase(BusType bt,const String &tn,GwApi *api,const String &prfx)
+        :busType(bt),type(tn),prefix(prfx){
     }
-    using Creator=std::function<SensorBase<BUS> *(GwApi *api,const String &prfx)>;
+    using Creator=std::function<SensorBase *(GwApi *api,const String &prfx)>;
     virtual bool isActive(){return false;};
-    virtual bool initDevice(GwApi *api,BUS *wire){return false;};
+    virtual bool initDevice(GwApi *api,void *bus){return false;};
     virtual bool preinit(GwApi * api){return false;}
-    virtual void measure(GwApi * api,BUS *wire, int counterId){};
+    virtual void measure(GwApi * api,void *bus, int counterId){};
     virtual ~SensorBase(){}
 };
-
-template<typename BUS>
-class SensorList : public std::vector<SensorBase<BUS>*>{
+template<typename BUS,SensorBase::BusType bt>
+class SensorTemplate : public SensorBase{
     public:
-    void add(GwApi *api, SensorBase<BUS> *sensor){
+    SensorTemplate(const String &tn,GwApi *api,const String &prfx)
+        :SensorBase(bt,tn,api,prfx){}
+    virtual bool initDevice(GwApi *api,BUS *bus){return false;};
+    virtual bool initDevice(GwApi *api,void *bus){
+        if (busType != bt) return false;
+        return initDevice(api,(BUS*)bus);
+    }
+    virtual void measure(GwApi * api,void *bus, int counterId){
+        if (busType != bt) return;
+        measure(api,(BUS*)bus,counterId);
+    };
+};
+
+
+class SensorList : public std::vector<SensorBase*>{
+    public:
+    void add(GwApi *api, SensorBase *sensor){
         sensor->readConfig(api->getConfig());
         api->getLogger()->logDebug(GwLog::LOG,"configured sensor %s, status %d",sensor->prefix.c_str(),(int)sensor->ok);
         this->push_back(sensor);
     }
-    using std::vector<SensorBase<BUS>*>::vector;
+    using std::vector<SensorBase*>::vector;
 };
 
 
diff --git a/lib/spitask/GwSpiSensor.h b/lib/spitask/GwSpiSensor.h
index 3d516a5..88127c6 100644
--- a/lib/spitask/GwSpiSensor.h
+++ b/lib/spitask/GwSpiSensor.h
@@ -48,7 +48,7 @@ class SPIBus{
     spi_host_device_t host() const { return hd;} 
 };
 
-using BusType=SPIBus;
+using BUSTYPE=SPIBus;
 
 class SSIDevice{
     spi_device_handle_t spi;
@@ -90,7 +90,7 @@ class SSIDevice{
 };
 
 
-class SSISensor : public SensorBase<BusType>{
+class SSISensor : public SensorTemplate<BUSTYPE,SensorBase::SPI>{
     std::unique_ptr<SSIDevice> device;
     protected:
     int bits=12;
@@ -125,17 +125,17 @@ class SSISensor : public SensorBase<BusType>{
         }
 
     public:
-    SSISensor(const String &type,GwApi *api,const String &prfx, int host):SensorBase(type,api,prfx)
+    SSISensor(const String &type,GwApi *api,const String &prfx, int host):SensorTemplate<BUSTYPE,SensorBase::SPI>(type,api,prfx)
     {
         busId=host;
     }
     virtual bool isActive(){return act;};
-    virtual bool initDevice(GwApi *api,BusType *bus){
+    virtual bool initDevice(GwApi *api,BUSTYPE *bus){
         return initSSI(api->getLogger(),bus, clock,cs,bits);
     };
     
 };
-using SpiSensorList=SensorList<BusType>;
+using SpiSensorList=SensorList;
 #define GWSPI1_HOST SPI2_HOST
 #define GWSPI2_HOST SPI3_HOST
 #endif
\ No newline at end of file