#include #include #include "DFRobot_ENS160.h" // Wi-Fi credentials const char* ssid = "MegMan-WiFi"; const char* password = "Zp5egGamPcENXr"; // I2C Communication setup DFRobot_ENS160_I2C ENS160(&Wire, 0x53); // Default I2C address is 0x53 AsyncWebServer server(80); String jsonData = "[]"; // JSON buffer to hold the air quality data uint8_t lastAQI = 0; // Store the last AQI value for display void setup() { Serial.begin(115200); // Initialise the sensor while (NO_ERR != ENS160.begin()) { Serial.println("Communication with ENS160 failed. Please check connections."); delay(3000); } Serial.println("ENS160 initialised successfully."); // Set power mode ENS160.setPWRMode(ENS160_STANDARD_MODE); // Set temperature and humidity compensation ENS160.setTempAndHum(25.0, 50.0); // Example values: 25°C, 50% humidity // Connect to Wi-Fi WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.println("Connecting to Wi-Fi..."); } Serial.println("Connected to Wi-Fi!"); Serial.print("ESP32 IP Address: "); Serial.println(WiFi.localIP()); // Route for the main webpage server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) { String html = R"rawliteral( Air Quality Monitoring

Air Quality Monitoring

Air Quality Index (AQI)

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eCO2 Recommendation

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TVOC Recommendation

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Real-Time Air Quality Graph

)rawliteral"; request->send(200, "text/html", html); }); // Route for sensor data (JSON) server.on("/data", HTTP_GET, [](AsyncWebServerRequest *request) { request->send(200, "application/json", jsonData); }); // Start the server server.begin(); } void loop() { uint16_t TVOC = ENS160.getTVOC(); uint16_t ECO2 = ENS160.getECO2(); uint8_t AQI = ENS160.getAQI(); unsigned long timestamp = millis(); String newEntry = "{\"timestamp\":" + String(timestamp) + ",\"tvoc\":" + String(TVOC) + ",\"eco2\":" + String(ECO2) + ",\"aqi\":" + String(AQI) + "}"; if (jsonData == "[]") { jsonData = "[" + newEntry + "]"; } else { jsonData = jsonData.substring(0, jsonData.length() - 1) + "," + newEntry + "]"; } // Limit data buffer to 60 entries (last minute) int maxEntries = 60; int count = std::count(jsonData.begin(), jsonData.end(), '{'); if (count > maxEntries) { int firstComma = jsonData.indexOf(','); jsonData = "[" + jsonData.substring(firstComma + 1); } delay(1000); // Update every second }