6. About MQ-4 Gas & Smoke Sensor
Features
◦ High Sensitivity to CH4, Natural Gas
◦ Fast Response
◦ Simple Drive Circuit
◦ Sensitive to LPG, Butane, Propane, Methane, Alcohol, Hydrogen
7. About MQ-4 Gas & Smoke Sensor
Application
◦ Detecting CH4, Natural Gas
◦ Detecting Smoke, Cooking Fumes
8. About MQ-4 Gas & Smoke Sensor
Notes
◦ Resistance of the sensor is different depending on the type of
the gas
◦ Built-in potentiometer allows to adjust the sensor sensitivity
10. About MQ-4 Gas & Smoke Sensor
Working Procedure
◦ The greater the gas concentration,
the greater the output voltage
◦ The lower the gas concentration
the lower the output voltage
11. Circuit Schematics
Pin Wiring for MQ-4 Sensor
◦ VCC to 5V
◦ A0 to A5
◦ GND to GND
Pin Wiring for Arduino UNO
◦ Red LED, Arduino Pin 12
◦ Green LED, Arduino Pin 11
◦ Buzzer, Arduino Pin 10