MQ-9 Carbon Monoxide, Combustible Gas Sensor Module

Easy-to-use sensor for measuring the concentration of carbon monoxide and flammable gases such as methane and LPG in the air. The MQ-9 measures a gas concentration and is ideal for detecting a gas leak, as a gas alarm or for other robotics and microcontroller projects.

The sensors of the MQ series use a small heating element with an electronic-chemical sensor. They are sensitive to various gases and are suitable for the use in rooms.

The sensor has a high sensitivity and fast response time, but it takes a few minutes to give accurate readings because the sensor needs to heat up. The measured values ​​of the sensor are output as an analog value, which can be easily evaluated with a microcontroller.

This sensor is ready for connection to a microcontroller, an Arduino board for example. For the use with a Raspberry Pi, an AD converter is required.

Specification

• Power supply: 5 V
• Current consumption: 150 mA
• Outputs: analog and digital
• Operating temperature: -10 to 50 °C
• Pins: goldpin connectors, 2.54 mm pitch
• Dimensions: 32x 20 mm
• It has mounting holes with diameter: 3 mm

Pin Out:

Pin assignment:

• VCC power supply 5V
• GND ground connection
• AOUT – Analog output
• DOUT – Digital Output

The Digital Output D0

With the help of placed on the reverse side of the board, potentiometer, set is the threshold, exceeding of which, causes the output D0 changing from a high to a low status. The pin D0 can be linked directly with a microcontroller or commissioning set, including Arduino, or for example, a module with a buzzer, which will signal a too low or too high level of unwanted gases in the air.

Analog output A0

The sensor has an analog output A0, which must be connected to the pin of the converter A/D (analog input in Arduino). This will allow you to measure the proportional voltage signal and more accurately determine the concentration.

Application:

• Gas leak monitoring device suitable for home or factory.
• Suitable for carbon monoxide, combustible gases and other monitoring devices.
• Can be tested for carbon monoxide.

MQ9 Gas Sensor Datasheet