Mq 135 Gas Sensor Working

The mq 135 gas sensor module has four pins standard male headers as shown above.

Mq 135 gas sensor working.

When there is an increase in polluting gases the resistance of the gas sensor decreases along with that. The ability of a gas sensor to detect gases depends on the chemiresister to conduct current. What is mq 135 and how does it work. The most commonly used chemiresistor is tin dioxide sno2 which is an n type semiconductor that has free electrons also called as donor.

This sensing element is subjected to current through connecting leads. This is a robust gas sensor suitable for sensing lpg smoke alcohol propane hydrogen methane and carbon monoxide concentrations in the air if you are planning on creating an indoor air quality monitoring system. The mq 3 gas sensor has a lower conductivity to clean the air as a gas sensing material. Since ao is a varying voltage this pin should be connected to one analog input of a microcontroller the do pin is an open collector digital output but with a pull up resistor onboard that becomes low when the detection level exceeds a predefined level.

Mq2 is a metal oxide semiconductor type gas sensor. Now you know quite a bit about mq 135 sensor let s move ahead and learn how to interface the mq 135 with arduino interfacing. What is mq 135 gas sensor and how does it work. The air quality information is readable via the ao pin.

Smoke detectors are very useful in detecting smoke or fire in buildings and so are the important safety parameters. The boost converter of the chip mq 3 gas sensor is pt1301. Mq 135 gas sensor applies sno2 which has a higher resistance in the clear air as a gas sensing material. To measure ppm using mq 135 sensor we need to look into the rs ro v s ppm graph taken from the mq135 datasheet.

The smoke sensor we used is the mq 135 sensor. The mq 135 gas sensor senses gases like ammonia nitrogen oxygen alcohols aromatic compounds sulfide and smoke. The operating voltage of this gas sensor is from 2 5v to 5 0v. The gas sensor module consists of a steel exoskeleton under which a sensing element is housed.

It can detect gases in the concentration of range 200 to 10000ppm. This sensor works on 5v dc voltage. Give your next arduino project a nose for gasses with the mq2 gas sensor module. If this works your sensor is working normally.

Try to leak the gas without igniting it near the sensor. Breath checker or early fire detection system mq2 gas sensor module is a great choice. Concentrations of gas in the gas is measured using a voltage divider network present in the sensor.