#include #include #define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64 #define OLED_RESET -1 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); #include #include #include #include // Wi-Fi Credentials const char* ssid = "_____"; const char* password = "_____"; ESP8266WebServer server(80); #define ADDR_IN 0x52 #define ADDR_OUT 0x53 #define SDA_PIN D2 #define SCL_PIN D1 SparkFun_ENS160 sensorIn; SparkFun_ENS160 sensorOut; uint16_t co2In = 0, tvocIn = 0; uint16_t co2Out = 0, tvocOut = 0; bool initSensor(SparkFun_ENS160 &sensor, const char* label, uint8_t address) { if (!sensor.begin(Wire, address)) { Serial.print(label); Serial.println(" init FAIL"); return false; } Serial.print(label); Serial.println(" init OK"); sensor.setOperatingMode(0x02); return true; } void readSensor(SparkFun_ENS160 &sensor, const char* label, uint16_t &co2, uint16_t &tvoc) { if (sensor.checkDataStatus()) { co2 = sensor.getECO2(); tvoc = sensor.getTVOC(); Serial.printf("%s: CO2 = %d ppm, TVOC = %d ppb\n", label, co2, tvoc); } else { Serial.printf("%s: No data\n", label); co2 = 0; tvoc = 0; } } void handleRoot() { String html = ""; html += ""; html += ""; html += ""; html += "

"; html += "

🌿 Air Quality Readings (ENS160)

"; html += "

CO₂ IN: " + String(co2In) + " ppm

"; html += "

TVOC IN: " + String(tvocIn) + " ppb

"; html += "

CO₂ OUT: " + String(co2Out) + " ppm

"; html += "

TVOC OUT: " + String(tvocOut) + " ppb

"; html += "

Page refreshes every 5 seconds

"; html += "

"; server.send(200, "text/html", html); } void setup() { Serial.begin(115200); Wire.begin(SDA_PIN, SCL_PIN); delay(1000); WiFi.begin(ssid, password); Serial.print("Connecting to WiFi"); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println("\nWiFi connected"); Serial.println(WiFi.localIP()); initSensor(sensorIn, "Sensor IN", ADDR_IN); delay(500); initSensor(sensorOut, "Sensor OUT", ADDR_OUT); delay(500); server.on("/", handleRoot); server.begin(); Serial.println("Web server started"); if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { Serial.println(F("SSD1306 allocation failed")); for (;;); } display.clearDisplay(); display.setTextSize(1); display.setTextColor(SSD1306_WHITE); display.setCursor(0, 0); display.println("OLED Ready..."); display.display(); delay(1000); } void loop() { readSensor(sensorIn, "Sensor IN", co2In, tvocIn); delay(500); readSensor(sensorOut, "Sensor OUT", co2Out, tvocOut); server.handleClient(); delay(3000); display.clearDisplay(); display.setCursor(0, 0); display.setTextSize(1); display.print("IN: CO2 "); display.print(co2In); display.println(" ppm"); display.print("IN: TVOC "); display.print(tvocIn); display.println(" ppb"); display.println(); display.print("OUT: CO2 "); display.print(co2Out); display.println(" ppm"); display.print("OUT: TVOC "); display.print(tvocOut); display.println(" ppb"); display.display(); }