MQ4
#include #include #include // Constants const int gasSensorPin = 32; // MQ-4 analog pin const float V_REF = 5.0; // Reference voltage const float R_LOAD = 10.0; // Load resistance in kΩ const float R_ZERO = 9.83; // Rs in clean air, adjust after calibration const float a = 116.6020682; // Datasheet constant const float b = -2.769034857; // Datasheet constant // Wi-Fi credentials const char* ssid = "GalaxyNET"; const char* password = "CONNECTME1"; // ThingSpeak channel info const String apiUrl = "http://api.thingspeak.com/update"; const String apiKey = "KIXTM7EXY1D66X3C"; // Variables unsigned long lastUpdate = 0; // Set up Wi-Fi and HTTP client WiFiClient client; void setup() { Serial.begin(9600); Serial.println("Connecting to Wi-Fi..."); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.print("."); } Serial.println("Connected to ...