The sensor could be used to detect different gases contains co and combustible gases it is with low cost and suitable for different application.
Mq 9 gas sensor circuit.
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.
Sensor resistance at various concentrations of gases.
The sensitivity of the sensor can be adjusted by using the potentiometer.
Sensitivity can be adjusted by varying the potentiometer.
0 91 monochrome oled display.
Solder some wires to the gas sensor s pins and add heat shrinking tubing.
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.
The sensor s conductivity is more higher along with.
It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v.
As shown in fig 2 standard measuring circuit of mq 9 sensitive components consists of 2 parts.
The sensor s conductivity is more higher along with the gas concentration rising.
One is heating circuit having time control function the.
The output voltage from the gas sensor increases when the concentration of gas increases.
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.
The sensor s conductivity is more higher along with the gas concentration rising.
Sensitive material of mq 9 gas sensor is sno2 which with lower conductivity in clean air.
Usb 2 0 cable a to mini b protoboard.
Good sensitivity to co combustible gas.
This ratio includes r0 sensor resistance in 1000ppm concentration of lpg and rs internal resistance of the sensor which changes by gas concentration.
Mq 9 gas sensor module.
Please note that the best preheat time for the sensor is above 24 hours.
The sensor could be used to detect different gases contains co and combustible gases it is with low cost and suitable for different application.
It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v.
It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v.
For detailed information about the mq 9 sensor please refer to the data sheet provided in resources section.
In clean air after preheating upload the following code and wait for about 15 minutes until r0 reaches a fixed value.
Methane gas sensor mq 4.
Long life and low cost.
Sensitive material of mq 9 gas sensor is sno2 which with lower conductivity in clean air.
High sensitivity to methane propane and co.
