The below diagram shows the basic circuit diagram of a gas sensor in a gas sensor module here a and b are the input and output terminals these are reversible means any of the paired terminals can be used as input or output and h is the heater coil terminal.
Mq 9 gas sensor circuit.
For detailed information about the mq 9 sensor please refer to the data sheet provided in resources section.
Good sensitivity to co combustible gas.
Usb 2 0 cable a to mini b protoboard.
It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v.
Long life and low cost.
Mq 9 semiconductor sensor for co combustible gas sensitive material of mq 9 gas sensor is sno 2 which with lower conductivity in clean air.
It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v.
Sensor resistance at various concentrations of gases.
As shown in fig 2 standard measuring circuit of mq 9 sensitive components consists of 2 parts.
Sensitive material of mq 9 gas sensor is sno2 which with lower conductivity in clean air.
5v ftdi basic usb to serial converter.
The sensor s conductivity is more higher along with the gas concentration rising.
Mq 9 gas sensor has high sensitity to carbon monoxide methane and lpg.
One is heating circuit having time control function the.
High sensitivity to methane propane and co.
It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v.
Solder some wires to the gas sensor s pins and add heat shrinking tubing.
Methane gas sensor mq 4.
Mq 9 gas sensor module.
Mq 9 gas sensor has high sensitity to carbon monoxide methane and lpg.
The sensor s conductivity is more higher along with the gas concentration rising.
In clean air after preheating upload the following code and wait for about 15 minutes until r0 reaches a fixed value.
Please note that the best preheat time for the sensor is above 24 hours.
The sensor s conductivity is more higher along with.
This ratio includes r0 sensor resistance in 1000ppm concentration of lpg and rs internal resistance of the sensor which changes by gas concentration.
The sensitivity of the sensor can be adjusted by using the potentiometer.
0 91 monochrome oled display.
A向 fig 1 mq 9 0 1 1 10 100 1000 10000 ppm r s r o lpg co ch4 air fig 3 sensitivity characteristics of the mq 9 a向 standard circuit.
Sensitivity can be adjusted by varying the potentiometer.
The sensor could be used to detect different gases contains co and combustible gases it is with low cost and suitable for different application.
