Energy Savings, Smart Home, Automation, Microcontrollers, Arduino.
from the app to Arduino. Fig 4 : HC-05 Bluetooth Module Smoke Sensor MQ2 gas sensor is an electronic sensor used for sensing the concentration of gases in the air such as LPG, propane, methane, hydrogen, alcohol, smoke and carbon monoxide. Fig 5 : MQ2 Smoke Sensor Temperature and Humidity Sensor