Support SHT31 temperature sensor

platformio.ini

@@ -105,4 +105,5 @@ lib_deps =
   adafruit/Adafruit INA260 Library@^1.5.0
   adafruit/Adafruit INA219@^1.2.0
   adafruit/Adafruit SHTC3 Library@^1.0.0
-  adafruit/Adafruit LPS2X@^2.0.4
+  adafruit/Adafruit LPS2X@^2.0.4
+  adafruit/Adafruit SHT31 Library@^2.2.0

src/configuration.h

@@ -114,6 +114,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define SHTC3_ADDR 0x70
 #define LPS22HB_ADDR 0x5C
 #define LPS22HB_ADDR_ALT 0x5D
+#define SHT31_ADDR 0x44
 
 // -----------------------------------------------------------------------------
 // Security

src/detect/i2cScan.h

@@ -191,6 +191,10 @@ void scanI2Cdevice()
                 nodeTelemetrySensorsMap[TelemetrySensorType_MCP9808] = addr;
                 DEBUG_MSG("MCP9808 sensor found\n");
             }
+            if (addr == SHT31_ADDR) {
+                DEBUG_MSG("SHT31 sensor found\n");
+                nodeTelemetrySensorsMap[TelemetrySensorType_SHT31] = addr;
+            }
             if (addr == SHTC3_ADDR) {
                 DEBUG_MSG("SHTC3 sensor found\n");
                 nodeTelemetrySensorsMap[TelemetrySensorType_SHTC3] = addr;

src/modules/Telemetry/EnvironmentTelemetry.cpp

@@ -20,6 +20,7 @@
 #include "Sensor/INA219Sensor.h"
 #include "Sensor/SHTC3Sensor.h"
 #include "Sensor/LPS22HBSensor.h"
+#include "Sensor/SHT31Sensor.h"
 
 BMP280Sensor bmp280Sensor;
 BME280Sensor bme280Sensor;
@@ -29,6 +30,7 @@ INA260Sensor ina260Sensor;
 INA219Sensor ina219Sensor;
 SHTC3Sensor shtc3Sensor;
 LPS22HBSensor lps22hbSensor;
+SHT31Sensor sht31Sensor;
 
 #define FAILED_STATE_SENSOR_READ_MULTIPLIER 10
 #define DISPLAY_RECEIVEID_MEASUREMENTS_ON_SCREEN true
@@ -93,6 +95,8 @@ int32_t EnvironmentTelemetryModule::runOnce()
             if (lps22hbSensor.hasSensor()) {
                 result = lps22hbSensor.runOnce();
             }
+            if (sht31Sensor.hasSensor())
+                result = sht31Sensor.runOnce();
         }
         return result;
     } else {
@@ -211,6 +215,8 @@ bool EnvironmentTelemetryModule::sendTelemetry(NodeNum dest, bool phoneOnly)
     m.variant.environment_metrics.temperature = 0;
     m.variant.environment_metrics.voltage = 0;
 
+    if (sht31Sensor.hasSensor())
+        sht31Sensor.getMetrics(&m);
     if (lps22hbSensor.hasSensor())
         lps22hbSensor.getMetrics(&m);
     if (shtc3Sensor.hasSensor())

src/modules/Telemetry/Sensor/SHT31Sensor.cpp

@@ -0,0 +1,31 @@
+#include "../mesh/generated/telemetry.pb.h"
+#include "configuration.h"
+#include "TelemetrySensor.h"
+#include "SHT31Sensor.h"
+#include <Adafruit_SHT31.h>
+
+SHT31Sensor::SHT31Sensor() : 
+    TelemetrySensor(TelemetrySensorType_SHT31, "SHT31") 
+{
+}
+
+int32_t SHT31Sensor::runOnce() {
+    DEBUG_MSG("Init sensor: %s\n", sensorName);
+    if (!hasSensor()) {
+        return DEFAULT_SENSOR_MINIMUM_WAIT_TIME_BETWEEN_READS;
+    }
+    status = sht31.begin(); 
+    return initI2CSensor();
+}
+
+void SHT31Sensor::setup() 
+{
+    // Set up oversampling and filter initialization
+}
+
+bool SHT31Sensor::getMetrics(Telemetry *measurement) {
+    measurement->variant.environment_metrics.temperature = sht31.readTemperature();
+    measurement->variant.environment_metrics.relative_humidity = sht31.readHumidity();
+
+    return true;
+}    

src/modules/Telemetry/Sensor/SHT31Sensor.h

@@ -0,0 +1,16 @@
+#include "../mesh/generated/telemetry.pb.h"
+#include "TelemetrySensor.h"
+#include <Adafruit_SHT31.h>
+
+class SHT31Sensor : virtual public TelemetrySensor {
+private:
+    Adafruit_SHT31 sht31 = Adafruit_SHT31();
+
+protected:
+    virtual void setup() override;
+    
+public:
+    SHT31Sensor();
+    virtual int32_t runOnce() override;
+    virtual bool getMetrics(Telemetry *measurement) override;
+};