Support for Sensirion SHT4x

src/helpers/sensors/EnvironmentSensorManager.cpp

@@ -35,6 +35,12 @@ static Adafruit_BMP280 BMP280;
 static Adafruit_SHTC3 SHTC3;
 #endif
 
+#if ENV_INCLUDE_SHT4X
+#define TELEM_SHT4X_ADDRESS 0x44  //0x44 - 0x46
+#include <SensirionI2cSht4x.h>
+static SensirionI2cSht4x SHT4X;
+#endif
+
 #if ENV_INCLUDE_LPS22HB
 #include <Arduino_LPS22HB.h>
 #endif
@@ -136,6 +142,21 @@ bool EnvironmentSensorManager::begin() {
   }
   #endif
 
+
+  #if ENV_INCLUDE_SHT4X
+  SHT4X.begin(*TELEM_WIRE, TELEM_SHT4X_ADDRESS);
+  uint32_t serialNumber = 0;
+  int16_t sht4x_error;
+  sht4x_error = SHT4X.serialNumber(serialNumber);
+  if (sht4x_error == 0) {
+    MESH_DEBUG_PRINTLN("Found SHT4X at address: %02X", TELEM_SHT4X_ADDRESS);
+    SHT4X_initialized = true;
+  } else {
+    SHT4X_initialized = false;
+    MESH_DEBUG_PRINTLN("SHT4X was not found at I2C address %02X", TELEM_SHT4X_ADDRESS);
+  }
+  #endif
+
   #if ENV_INCLUDE_LPS22HB
   if (BARO.begin()) {
     MESH_DEBUG_PRINTLN("Found sensor: LPS22HB");
@@ -249,6 +270,18 @@ bool EnvironmentSensorManager::querySensors(uint8_t requester_permissions, Cayen
     }
     #endif
 
+    #if ENV_INCLUDE_SHT4X
+    if (SHT4X_initialized) {
+      float sht4x_humidity, sht4x_temperature;
+      int16_t sht4x_error;
+      sht4x_error = SHT4X.measureLowestPrecision(sht4x_temperature, sht4x_humidity);
+      if (sht4x_error == 0) {
+        telemetry.addTemperature(TELEM_CHANNEL_SELF, sht4x_temperature);
+        telemetry.addRelativeHumidity(TELEM_CHANNEL_SELF, sht4x_humidity);
+      }
+    }
+    #endif
+
     #if ENV_INCLUDE_LPS22HB
     if (LPS22HB_initialized) {
       telemetry.addTemperature(TELEM_CHANNEL_SELF, BARO.readTemperature());

src/helpers/sensors/EnvironmentSensorManager.h

@@ -18,6 +18,7 @@ protected:
   bool LPS22HB_initialized = false;
   bool MLX90614_initialized = false;
   bool VL53L0X_initialized = false;
+  bool SHT4X_initialized = false;
 
   bool gps_detected = false;
   bool gps_active = false;

variants/rak4631/platformio.ini

@@ -27,6 +27,7 @@ build_flags = ${nrf52_base.build_flags}
   -D ENV_INCLUDE_INA3221=1
   -D ENV_INCLUDE_INA219=1
   -D ENV_INCLUDE_INA260=1
+  -D ENV_INCLUDE_SHT4X=1
 build_src_filter = ${nrf52_base.build_src_filter}
   +<../variants/rak4631>
   +<helpers/sensors>
@@ -42,7 +43,8 @@ lib_deps =
   adafruit/Adafruit BMP280 Library @ ^2.6.8
   adafruit/Adafruit SHTC3 Library @ ^1.0.1
   adafruit/Adafruit INA260 Library @ ^1.5.3
-  sparkfun/SparkFun u-blox GNSS Arduino Library@^2.2.27
+  sparkfun/SparkFun u-blox GNSS Arduino Library @ ^2.2.27
+  sensirion/Sensirion I2C SHT4x @ ^1.1.2
 
 [env:RAK_4631_Repeater]
 extends = rak4631