Mq 135 Gas Sensor Working

The smoke sensor we used is the mq 135 sensor.

Mq 135 gas sensor working.

This sensing element is subjected to current through connecting leads. The gas sensor module consists of a steel exoskeleton under which a sensing element is housed. What is mq 135 and how does it work. The operating voltage of this gas sensor is from 2 5v to 5 0v.

The ability of a gas sensor to detect gases depends on the chemiresister to conduct current. Try to leak the gas without igniting it near the sensor. As the concentration of gas rises around the sensor the current flow through ammeter increases. Concentrations of gas in the gas is measured using a voltage divider network present in the sensor.

It can detect gases in the concentration of range 200 to 10000ppm. What is mq 135 gas sensor and how does it work. The mq 135 gas sensor module has four pins standard male headers as shown above. The most commonly used chemiresistor is tin dioxide sno2 which is an n type semiconductor that has free electrons also called as donor.

Breath checker or early fire detection system mq2 gas sensor module is a great choice. The mq 3 gas sensor has a lower conductivity to clean the air as a gas sensing material. The air quality information is readable via the ao pin. 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 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. Mq2 is a metal oxide semiconductor type gas sensor. When there is an increase in polluting gases the resistance of the gas sensor decreases along with that.

Normally the atmosphere will contain more oxygen than combustible gases. 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. Simply we have interfaced mq 135 gas sensor module with arduino and 16 2 lcd module for display. Give your next arduino project a nose for gasses with the mq2 gas sensor module.

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. Smoke detectors are very useful in detecting smoke or fire in buildings and so are the important safety parameters. 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.