SHTC3 Sensor (RAK-1901) support (#1800)

platformio.ini

@@ -90,4 +90,4 @@ lib_deps =
   adafruit/Adafruit MCP9808 Library@^2.0.0
   adafruit/Adafruit INA260 Library@^1.5.0
   adafruit/Adafruit INA219@^1.2.0
-
+  https://github.com/adafruit/Adafruit_SHTC3@^1.0.0

src/configuration.h

@@ -110,6 +110,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define INA_ADDR_ALTERNATE 0x41
 #define QMC6310_ADDR 0x1C
 #define QMI8658_ADDR 0x6B
+#define SHTC3_ADDR 0x70
 
 // -----------------------------------------------------------------------------
 // Security

src/detect/i2cScan.h

@@ -191,14 +191,18 @@ void scanI2Cdevice(void)
             nodeTelemetrySensorsMap[TelemetrySensorType_MCP9808] = addr;
             DEBUG_MSG("MCP9808 sensor found at address 0x%x\n", (uint8_t)addr);
         }
-        if(addr == QMC6310_ADDR){
+        if (addr == QMC6310_ADDR) {
             DEBUG_MSG("QMC6310 3-Axis magnetic sensor found at address 0x%x\n", (uint8_t)addr);
             nodeTelemetrySensorsMap[TelemetrySensorType_QMC6310] = addr;
         }
-        if(addr == QMI8658_ADDR){
+        if (addr == QMI8658_ADDR) {
             DEBUG_MSG("QMI8658 6-Axis inertial measurement sensor found at address 0x%x\n", (uint8_t)addr);
             nodeTelemetrySensorsMap[TelemetrySensorType_QMI8658] = addr;
         }
+        if (addr == SHTC3_ADDR) {
+            DEBUG_MSG("SHTC3 sensor found at address 0x%x\n", (uint8_t)addr);
+            nodeTelemetrySensorsMap[TelemetrySensorType_SHTC3] = addr;
+        }
         } else if (err == 4) {
             DEBUG_MSG("Unknow error at address 0x%x\n", addr);
         }

src/modules/Telemetry/EnvironmentTelemetry.cpp

@@ -17,6 +17,7 @@
 #include "Sensor/MCP9808Sensor.h"
 #include "Sensor/INA260Sensor.h"
 #include "Sensor/INA219Sensor.h"
+#include "Sensor/SHTC3Sensor.h"
 
 BMP280Sensor bmp280Sensor;
 BME280Sensor bme280Sensor;
@@ -24,6 +25,7 @@ BME680Sensor bme680Sensor;
 MCP9808Sensor mcp9808Sensor;
 INA260Sensor ina260Sensor;
 INA219Sensor ina219Sensor;
+SHTC3Sensor shtc3Sensor;
 
 #define FAILED_STATE_SENSOR_READ_MULTIPLIER 10
 #define DISPLAY_RECEIVEID_MEASUREMENTS_ON_SCREEN true
@@ -83,6 +85,8 @@ int32_t EnvironmentTelemetryModule::runOnce()
                 result = ina260Sensor.runOnce();
             if (ina219Sensor.hasSensor())
                 result = ina219Sensor.runOnce();
+            if (shtc3Sensor.hasSensor())
+                result = shtc3Sensor.runOnce();
         }
         return result;
     } else {
@@ -212,6 +216,8 @@ bool EnvironmentTelemetryModule::sendOurTelemetry(NodeNum dest, bool wantReplies
         ina219Sensor.getMetrics(&m);
     if (ina260Sensor.hasSensor())
         ina260Sensor.getMetrics(&m);
+    if (shtc3Sensor.hasSensor())
+        shtc3Sensor.getMetrics(&m);
 
     DEBUG_MSG("Telemetry->time: %i\n", m.time);
     DEBUG_MSG("Telemetry->barometric_pressure: %f\n", m.variant.environment_metrics.barometric_pressure);

src/modules/Telemetry/Sensor/SHTC3Sensor.cpp

@@ -0,0 +1,34 @@
+#include "../mesh/generated/telemetry.pb.h"
+#include "configuration.h"
+#include "TelemetrySensor.h"
+#include "SHTC3Sensor.h"
+#include <Adafruit_SHTC3.h>
+
+SHTC3Sensor::SHTC3Sensor() : 
+    TelemetrySensor(TelemetrySensorType_SHTC3, "SHTC3") 
+{
+}
+
+int32_t SHTC3Sensor::runOnce() {
+    DEBUG_MSG("Init sensor: %s\n", sensorName);
+    if (!hasSensor()) {
+        return DEFAULT_SENSOR_MINIMUM_WAIT_TIME_BETWEEN_READS;
+    }
+    status = shtc3.begin(); 
+    return initI2CSensor();
+}
+
+void SHTC3Sensor::setup() 
+{
+    // Set up oversampling and filter initialization
+}
+
+bool SHTC3Sensor::getMetrics(Telemetry *measurement) {
+    sensors_event_t humidity, temp;
+    shtc3.getEvent(&humidity, &temp);
+
+    measurement->variant.environment_metrics.temperature = temp.temperature;
+    measurement->variant.environment_metrics.relative_humidity = humidity.relative_humidity;
+
+    return true;
+}    

src/modules/Telemetry/Sensor/SHTC3Sensor.h

@@ -0,0 +1,16 @@
+#include "../mesh/generated/telemetry.pb.h"
+#include "TelemetrySensor.h"
+#include <Adafruit_SHTC3.h>
+
+class SHTC3Sensor : virtual public TelemetrySensor {
+private:
+    Adafruit_SHTC3 shtc3 = Adafruit_SHTC3();
+
+protected:
+    virtual void setup() override;
+    
+public:
+    SHTC3Sensor();
+    virtual int32_t runOnce() override;
+    virtual bool getMetrics(Telemetry *measurement) override;
+};