Mq 9 Gas Sensor Circuit

In clean air after preheating upload the following code and wait for about 15 minutes until r0 reaches a fixed value.

Mq 9 gas sensor circuit.

5v ftdi basic usb to serial converter. High sensitivity to methane propane and co. Please note that the best preheat time for the sensor is above 24 hours. 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. As shown in fig 2 standard measuring circuit of mq 9 sensitive components consists of 2 parts. Sensitivity can be adjusted by varying the potentiometer. 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. 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. For detailed information about the mq 9 sensor please refer to the data sheet provided in resources section. The sensor s conductivity is more higher along with the gas concentration rising.

Usb 2 0 cable a to mini b protoboard. Sensor resistance at various concentrations of gases. It make detection by method of cycle high and low temperature and detect co when low temperature heated by 1 5v. The sensor s conductivity is more higher along with the gas concentration rising.

Solder some wires to the gas sensor s pins and add heat shrinking tubing. One is heating circuit having time control function the. Sensitive material of mq 9 gas sensor is sno2 which with lower conductivity in clean air. The sensor s conductivity is more higher along with.

The output voltage from the gas sensor increases when the concentration of gas increases. Mq 9 gas sensor has high sensitity to carbon monoxide methane and lpg. The sensor could be used to detect different gases contains co and combustible gases it is with low cost and suitable for different application. 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. 0 91 monochrome oled display. Mq 9 gas sensor module. Good sensitivity to co combustible gas.

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. Mq 9 gas sensor has high sensitity to carbon monoxide methane and lpg.