add code for SHT4X, ENV4

lib/iictask/SHT4X.h

@@ -0,0 +1,76 @@
+#ifndef __SHT4X_H_
+#define __SHT4X_H_
+
+#include "Arduino.h"
+#include "Wire.h"
+
+#define SHT40_I2C_ADDR_44 0x44
+#define SHT40_I2C_ADDR_45 0x45
+#define SHT41_I2C_ADDR_44 0x44
+#define SHT41_I2C_ADDR_45 0x45
+#define SHT45_I2C_ADDR_44 0x44
+#define SHT45_I2C_ADDR_45 0x45
+
+#define SHT4x_DEFAULT_ADDR 0x44 /**< SHT4x I2C Address */
+#define SHT4x_NOHEAT_HIGHPRECISION \
+    0xFD /**< High precision measurement, no heater */
+#define SHT4x_NOHEAT_MEDPRECISION \
+    0xF6 /**< Medium precision measurement, no heater */
+#define SHT4x_NOHEAT_LOWPRECISION \
+    0xE0 /**< Low precision measurement, no heater */
+
+#define SHT4x_HIGHHEAT_1S \
+    0x39 /**< High precision measurement, high heat for 1 sec */
+#define SHT4x_HIGHHEAT_100MS \
+    0x32 /**< High precision measurement, high heat for 0.1 sec */
+#define SHT4x_MEDHEAT_1S \
+    0x2F /**< High precision measurement, med heat for 1 sec */
+#define SHT4x_MEDHEAT_100MS \
+    0x24 /**< High precision measurement, med heat for 0.1 sec */
+#define SHT4x_LOWHEAT_1S \
+    0x1E /**< High precision measurement, low heat for 1 sec */
+#define SHT4x_LOWHEAT_100MS \
+    0x15 /**< High precision measurement, low heat for 0.1 sec */
+
+#define SHT4x_READSERIAL 0x89 /**< Read Out of Serial Register */
+#define SHT4x_SOFTRESET  0x94 /**< Soft Reset */
+
+typedef enum {
+    SHT4X_HIGH_PRECISION,
+    SHT4X_MED_PRECISION,
+    SHT4X_LOW_PRECISION,
+} sht4x_precision_t;
+
+/** Optional pre-heater configuration setting */
+typedef enum {
+    SHT4X_NO_HEATER,
+    SHT4X_HIGH_HEATER_1S,
+    SHT4X_HIGH_HEATER_100MS,
+    SHT4X_MED_HEATER_1S,
+    SHT4X_MED_HEATER_100MS,
+    SHT4X_LOW_HEATER_1S,
+    SHT4X_LOW_HEATER_100MS,
+} sht4x_heater_t;
+
+class SHT4X {
+   public:
+    bool begin(TwoWire* wire = &Wire, uint8_t addr = SHT40_I2C_ADDR_44);
+    bool update(void);
+
+    float cTemp    = 0;
+    float humidity = 0;
+
+    void setPrecision(sht4x_precision_t prec);
+    sht4x_precision_t getPrecision(void);
+    void setHeater(sht4x_heater_t heat);
+    sht4x_heater_t getHeater(void);
+
+   private:
+    TwoWire* _wire;
+    uint8_t _addr;
+
+    sht4x_precision_t _precision = SHT4X_HIGH_PRECISION;
+    sht4x_heater_t _heater       = SHT4X_NO_HEATER;
+};
+
+#endif