Mq 135 Gas Sensor Working

Mq2 is a metal oxide semiconductor type gas sensor.

Mq 135 gas sensor working.

It can detect gases in the concentration of range 200 to 10000ppm. 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. The smoke sensor we used is the mq 135 sensor. Give your next arduino project a nose for gasses with the mq2 gas sensor module.

Smoke detectors are very useful in detecting smoke or fire in buildings and so are the important safety parameters. This sensor works on 5v dc voltage. Breath checker or early fire detection system mq2 gas sensor module is a great choice. As the concentration of gas rises around the sensor the current flow through ammeter increases.

Try to leak the gas without igniting it near the sensor. When there is an increase in polluting gases the resistance of the gas sensor decreases along with that. The operating voltage of this gas sensor is from 2 5v to 5 0v. The mq 3 gas sensor has a lower conductivity to clean the air as a gas sensing material.

The mq 135 gas sensor senses gases like ammonia nitrogen oxygen alcohols aromatic compounds sulfide and smoke. If this works your sensor is working normally. Normally the atmosphere will contain more oxygen than combustible gases. The ability of a gas sensor to detect gases depends on the chemiresister to conduct current.

Concentrations of gas in the gas is measured using a voltage divider network present in the sensor. Simply we have interfaced mq 135 gas sensor module with arduino and 16 2 lcd module for display. The boost converter of the chip mq 3 gas sensor is pt1301. 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.

This sensing element is subjected to current through connecting leads. 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. Mq 135 gas sensor applies sno2 which has a higher resistance in the clear air as a gas sensing material.

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 and how does it work. The mq 135 gas sensor module has four pins standard male headers as shown above.