MQ-135 alcohol, benzine, ammonia sensor - semiconductor

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 mostof the commissioning modulesincluding Raspberry PiandArduino.

• Power supply: from 2.5 V to 5 V
• Analog and digital output
• Pins: goldpin connectors of 2.54 mm raster
• Board sizes: 33 x 20 mm
• It has mounting holes with the diameter: 3 mm

Specifications and other detailed information can be found in thedocumentation.

The product is compatible with Arduino

In the web, you can find sample programsforArduinoandSTM32.

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 witha microcontrolleror commissioning set, includingArduino, or for example, with a module of a buzzer which will signal too low or high level of gasesin the air.

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

• Documentation of the sensor MQ-135
• User manual
• Program for Arduino and STM32
• Software TCP232