Apart from Arduino and LCD, we are also using DHT11 sensor to read the atmospheric humidity values. If it finds that relative humidity is lower than the required limit, it turns on the humidifier, and ...

Step 3: If the humidifier decreases below threshold and presence has been detected in the last few minutes, trigger the humidifier module and start the DC fan. Step 4: After a fixed delay, stop the ...

Fig. 2 shows the circuit diagram of the humidifier. The system is built around an Arduino Uno (MOD1), a 5V SPDT relay module, a humidity sensor (DHT22), an ultrasonic humidifier, and a few other ...

Open Arduino IDE and install all nesesary libraries. Open controller.ino and upload to Arduino UNO (controller module) then upload server.ino to ESP8266 (server module). Connect all elements like an ...