MQ2 Combustible Gas sensor circuit

demetal · Jun 11, 2011

Hi,

i want to built a Combustible gas sensor circuit using the 6 pin gas sensor MQ2 (winsen)... to interface with microcontroller... now i only want to operate a relay without using a microcontroller...

I dont know how to connect the pins... if any one have schematic please help.....

Thankyou.

mister_rf · Jun 11, 2011

Read the datasheet:

The sensor need to be put 2 voltage:
heater voltage（VH） and test voltage（VC）.
VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance （RL）whom is in series with sensor. The sensor has light polarity, Vc need DC
power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance,
suitable RL value is needed: Power of Sensitivity body(Ps):
Ps=Vc2×Rs/(Rs+RL)2

Vh=5V

---------- Post added at 12:17 ---------- Previous post was at 12:14 ----------

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demetal · Jun 12, 2011

i want circuit which uses IC HA17358B ( dual opamp) and IC HEF40106B..... please help.....

aameer · Oct 17, 2011

check this 1

it may help u but the sensor is MQ303A

MQ2 Combustible Gas sensor circuit

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MQ2 Combustible Gas sensor circuit

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