Adapt the project to the SCD41 sensor

src/main.cpp

@@ -1,38 +1,62 @@
 #include "config.h"
 #include "wlan.h"
 #include <Arduino.h>
-#include <DHT.h>
+#include <SensirionI2cScd4x.h>
+#include <Wire.h>
 
-#define DHTTYPE DHT22
-#define DHTPIN 4
-DHT dht(DHTPIN, DHTTYPE);
+SensirionI2cScd4x sensor;
+
+int error;
+static char errorMessage[64];
 
 const char *config_file_path = "/config.json";
+long inactivity_delay;
 Config *config;
 WiFiClient wifi_client;
 PubSubClient mqtt_client(wifi_client);
 
-bool check_valid_value(float value) {
-  return (!isnan(value) && value >= 0 && value <= 100);
+int check_error(int error) {
+    if (error) {
+        Serial.println("Error while initializing sensor");
+        errorToString(error, errorMessage, sizeof errorMessage);
+        return 1;
+    }
+    return 0;
 }
 
 void setup() {
-  Serial.begin(9600);
-  dht.begin();
-  config = (Config *)malloc(sizeof(Config));
-  if (!load_config_file(config_file_path, config))
-    Serial.println("ERROR: The config file could not be loaded");
-  connect_wlan(config);
+    Serial.begin(9600);
+    Wire.begin();
+    sensor.begin(Wire, SCD41_I2C_ADDR_62);
+    error = sensor.wakeUp();
+    error = sensor.stopPeriodicMeasurement();
+    error = sensor.reinit();
+    error = sensor.startPeriodicMeasurement();
+    inactivity_delay = 60000;
 }
 
 void loop() {
-  float temperature = dht.readTemperature();
-  float humidity = dht.readHumidity();
-  float data[2] = {temperature, humidity};
-  if (check_valid_value(temperature) && check_valid_value(humidity)) {
-    mqtt_transfer(mqtt_client, config, data);
-  }
-  disconnect_mqtt(mqtt_client, config->topic);
-  free(config);
-  enter_deep_sleep(false, config->sleep_time);
+    uint16_t co2_concentration = 0.0;
+    float temperature = 0.0;
+    float humidity = 0.0;
+    bool data_available = false;
+
+    error = sensor.getDataReadyStatus(data_available);
+    error = sensor.readMeasurement(co2_concentration, temperature, humidity);
+
+    if (data_available) {
+        Serial.print("CO2 concentration [ppm]: ");
+        Serial.print(co2_concentration);
+        Serial.println();
+        Serial.print("Temperature [°C]: ");
+        Serial.print(temperature);
+        Serial.println();
+        Serial.print("Relative Humidity [RH]: ");
+        Serial.print(humidity);
+        Serial.println();
+    } else {
+        Serial.println(".");
+    }
+
+    delay(inactivity_delay);
 }