MQ-135 alcohol, benzen, ammonia sensor module - semiconductor - Waveshare 9528

The sensor detects the concentration of benzene, alcohol and smoke in the air, the result can be obtained measuring the voltage on the analog output. The system is supplied with the voltage from 2.5 V to 5 V. It has a digital and analog output, making it compatible with most of the commissioning modules including Raspberry Pi and Arduino.

• Power supply: from 2.5 V to 5 V
• Analog and digital output
• Pins: goldpin connectors of 2.54 mm raster
• Board sizes: 40 x 21 mm
• It has mounting holes with the diameter: 2 mm

Specifications and other detailed information can be found in the documentation.

The product is compatible with Arduino

In the web, you can find sample programs for Arduino and STM32.

The module has the connecting cable with female ends.

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

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

• The website of the manufacturer of Waveshare
• Documentation for the sensor MQ-135
• User manual
• Diagram of the module
• Program for Arduino and STM32
• Software TCP232