Electronic Brick - Gas Sensor MQ135
MQ-135 Gas Sensor
- What is MQ-135 and how does it work?
- Pin Configuration.
- Required Components.
- Wiring Connections.
- Testing the Circuit.
- Code for Arduino.
- 1 What is MQ-135 gas sensor and how does it work?
- 2 Pin Configuration MQ-135 gas sensor
- 3 Specifications of MQ-135 gas sensor
- 4 Code for interfacing of MQ-135 gas sensor with Arduino
What is MQ-135 gas sensor and how does it work?
The gas sensor module consists of a steel exoskeleton under which a sensing element is housed. This sensing element is subjected to current through connecting leads. This current is known as heating current through it, the gases coming close to the sensing element get ionized and are absorbed by the sensing element. This changes the resistance of the sensing element which alters the value of the current going out of it.
Configuration MQ-135 gas sensor
From left to right first pins are as follows:
A0 Analog output
D0 Digital output
Vcc Supply (5V)
Specifications of MQ-135 gas sensor
- Wide detecting scope
- Fast response and High sensitivity
- Stable and long life Simple drive circuit
- Used in air quality control equipment for buildings/offices, is suitable for detecting
of NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
- Size: 35mm x 22mm x 23mm (length x width x height)
- Working voltage: DC 5 V
- Signal output instruction.
- Dual signal output (analog output, and high/low digital output)
- 0 ~ 4.2V analog output voltage, the higher the concentration the higher the voltage.