Add basic sensor files for SCD4x

WifiControlSensor/SCD4X.h

@@ -0,0 +1,23 @@
+#pragma once
+#ifdef CONFIG_ENABLE_SCD4X
+#include "debug_sketch.h"
+
+int SCD4XGetMeasure(float &t, float &h, uint16_t &co2);
+int SCD4XSetup();
+bool SCD4XIsConnected();
+
+#else
+int SCD4XGetMeasure(float &, float &, uint16_t &)
+{
+        return -1;
+};
+int SCD4XSetup()
+{
+        SKETCH_DEBUG_PRINTLN("SCD4X is disabled at build time");
+        return -1;
+};
+bool SCD4XIsConnected()
+{
+        return false;
+};
+#endif

WifiControlSensor/SCD4X.ino

@@ -0,0 +1,61 @@
+#ifdef CONFIG_ENABLE_SCD4X
+#include "SCD4X.h"
+#include <Arduino.h>
+#include <SensirionI2CScd4x.h>
+#include <Wire.h>
+
+SensirionI2CScd4x scd4x;
+
+int SCD4XConnected = 0;
+
+int SCD4XSetup()
+{
+    Wire.begin();
+    scd4x.begin(Wire);
+
+    // Stop previous measurement
+    uint16_t error = scd4x.stopPeriodicMeasurement();
+    if (error) {
+        SKETCH_DEBUG_PRINTLN("Cannot connect to SCD4X");
+        return -1;
+    }
+
+    // Start new measurement
+    error = scd4x.startPeriodicMeasurement();
+    if (error) {
+        SKETCH_DEBUG_PRINTLN("Cannot start measurement for SCD4X");
+        return -1;
+    }
+    SCD4XConnected = 1;
+
+    return 0;
+}
+int SCD4XGetMeasure(float &temperature, float &humidity, uint16_t &co2)
+{
+    // Read Measurement
+    bool isDataReady = false;
+
+    uint16_t error = scd4x.getDataReadyFlag(isDataReady);
+    if (error) {
+        SKETCH_DEBUG_PRINTLN("Error trying to execute getDataReadyFlag() for SCD4X ");
+        return -1;
+    }
+    if (!isDataReady) {
+        return -1;
+    }
+    error = scd4x.readMeasurement(co2, temperature, humidity);
+    if (error || co2 == 0) {
+        char errorMsg[256];
+        SKETCH_DEBUG_PRINT("Error with reading measurement. Error : ");
+        errorToString(error, errorMsg, sizeof(errorMsg));
+        SKETCH_DEBUG_PRINTLN(" Co2: %d", co2);
+
+        return -1;
+    }
+    return 0;
+}
+bool SCD4XIsConnected()
+{
+    return SCD4XConnected != 0;
+}
+#endif