The mq 4 gas sensor has a built in variable resistor that changes its value according to the concentration of gas.
Mq 4 gas sensor.
A gas sensor is a device which detects the presence or concentration of gases in the atmosphere.
Besides the built in resistor it is necessary to include load resistor load resistor serve to adjust sensor.
New code examples added for gas concentration mq series sensors use a small heater inside with an electro chemical sensor in order to measure different kind of gases combinations.
When the target combustible gas exist the sensor s conductivity is more higher along with the gas concentration rising.
In this project we will go over how to build a methane sensor circuit with an arduino.
Mq 4 semiconductor sensor for natural gas sensitive material of mq 4 gas sensor is sno 2 which with lower conductivity in clean air.
The heater provides necessary work conditions for work of.
You can get this sensor for several.
Methane ch 4 is a colorless odorless gas.
Mq gas sensor type is the most popular gas sensor for hobbyist easy to get and of course very cheap.
Arduino mq4 gas sensor review and tutorial with video example.
Structure and configuration of mq 4 gas sensor is shown in above figure configuration a or b sensor composed by micro al 2 o 3 ceramic tube tin dioxide sno 2 sensitive layer measuring electrode and heater are fixed into a crust made by plastic and stainless steel net.
They can be calibrated but in order to do that a know.
This is a simple to use compressed natural gas cng sensor suitable for sensing natural gas composed of mostly methane ch4 concentrations in the air.
Structure and configuration of mq 4 gas sensor is shown as fig.
Mq 4 sensor is highly sensitive to methane ch 4.
Mq series semiconductor gas sensor application gas leak detection for houses workshops commercial building fire safety detection system.
The sensor s output is an analog resistance.
Please use simple electrocircuit convert change of conductivity to correspond output.
1 configuration a or b sensor composed by micro al2o3 ceramic tube tin dioxide sno2 sensitive layer measuring electrode and heater are fixed into a crust made by plastic and stainless steel net.
Here s the list taken from arduino cc website.
If the concentration is high the resistance decreases if the concentration is low the resistance increases.
Gas sensor with give an voltage output that increases with concentration.
Carbon monoxide co mq 8.
This is a sensor that is sensitive to effects of methane.
Lpg natural gas coal gas.
This sensor has a high sensitivity and fast response time.
Co and combustible gas.
Natural gas lpg.
Mq 4 methane sensor circuit built with an arduino.
Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor which can be measured as output voltage.
Mq4 gas sensor overview updates.
