Description

MH Sensor Series

This is an easy to use sensor module you can use to sense the amount of contaminant in surrounding air, giving the reading of air quality index. This is a famous sensor module commonly used with Arduino to build smoke detectors, IoT environment monitoring and smart agricultural projects.

Note : This sensor works with both digital and analog mode. You can connect analog output (AO) to get the air quality index reading (conversion required), or you can connect the digital output (DO) to sense the threshold of air quality. Adjust the potentiometer (a.k.a. trimmer) to set the digital output (DO) sensitivity.

This gas sensor heating element is alternating between 1.4V and 5V.

Sensitive to Gas

• Carbon Monoxide (CO)
• Flammable gases

 

Common Features

• Operating voltage : 5V
• Output type : DIGITAL and ANALOG
• Preheat duration : 20s
• Adjustable sensitivity via potentiometer
• Comes with LED indicators for POWER and OUTPUT
• Fixed screw holes for easy installation
• Model : FC-22

 

Wiring

Label	Meaning	Connection
VCC	Power source	Connect to 5V of system
GND	Ground	Connect to GND of system
DO	Digital Output	Connect to digital IO pin
AO	Analog Output	Connect to analog input pin

 

Attachments

• Information about MQ gas sensor series
• Introduction to Gas Sensors: Construction Types and Working
• Tutorial with code : How to Calibrate & Use MQ9 Gas Sensor w/ Arduino – Arduino Project Hub
• Tutorial with code : Analog CO/Combustible Gas Sensor(MQ9) – EleCrow
• Datasheet – MQ-9