MQ-135 Air Quality Sensor

MQ-135 Air Quality Sensor

Smoke Detector 10/1000ppm Cigarette Fire Alarm Harmful Gas NH3 NOx Alcohol Vapor Benzene CO2

     It is suitable for use in monitoring harmful gases in closed areas where people are dense, such as homes, factories, schools etc. The measurement value is between 10 and 1000ppm. Low harmful gases in the air means an increase in air quality. When pollution occurs in the air, the conductivity of the sensor increases. It gives an analog or digital signal from the output pin according to the conductivity ratio.

     It can detect the presence of ammonia NH3, sulfur, alcohol vapor, benzene, butane, propane, smoke and CO2 gases. With its low cost, it provides the opportunity to detect a wide variety of gases. You can get an alarm output by creating a threshold value with the potentiometer on the product and using the digital output pin. Or you can use the analog data from the analog output pin.

•    Versatile gas detection: The MQ-135 sensor module can detect many different gas types such as carbon dioxide (CO2), methane (CH4), ammonia (NH3), methanol (CH3OH). This makes the module usable in a wide range of applications.
•    High sensitivity: Thanks to its high quality sensor, the module measures air quality precisely and detects changes instantly.
•    Instant feedback: MQ-135 works with changes in resistance value depending on the gas type it detects. These changes provide instant feedback via platforms such as microcontroller or Arduino, presenting information to the user.
•    Easy integration: The module is designed for a wide user base and is generally compatible with popular platforms such as Arduino, Raspberry Pi. In this way, users can easily integrate the module into their own projects.
•    Long Life and Durability: MQ-135 is ideal for long term use with its long life sensor and robust structure.

Features:

• Operating voltage: Dc 5V
• Operating current: 150mA
• Test range:  10ppm  / 1000ppm
• Analog signal output AD  DC 0.1V / 4V
• When the concentration increases, the analog output voltage increases.
• TTL Digital signal output DO
• Sensitivity adjustment pot
• It can drive a relay.
• Supply indicator led
• Digital output indicator led.
• Warm up time:  20sec
• Long life
• Fast response time
• Operating temperature:  -20C  /  70C
• 4 Pieces mounting holes
• Dimensions: 20mm x 32mm x 22mm
• Weight:  8gr

Pin description:

• VCC: Supply + 5V
• GND: Ground
• DO: Digital TTL output ( According to the set pot value)
• AO: Analog signal output pin.

Software support:    search.arduino.cc/search?tab=&q=mq-135

Package contents:

• 1 Piece  MQ-135 Air Quality Sensor