SN-MQ7 and SN-MQ9

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SN-MQ7 and SN-MQ9

Postby junseen » Tue Apr 28, 2015 5:43 am

I am confused why both the SN-MQ7 and SN-MQ9 sensors' pin2-VCC and pin3-GND are interconnected ? Can someone help me?
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Re: SN-MQ7 and SN-MQ9

Postby ZaM » Tue Apr 28, 2015 3:34 pm

do you refer from shematic provided by cytron? if yes, that not connect, but if there red dot, that mean it connect each other.
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Re: SN-MQ7 and SN-MQ9

Postby junseen » Tue Apr 28, 2015 9:53 pm

There is no red dot on the sensor.I use the digital mutlimeter to check the continuity but still found that those 2 pins are interconnected. What is the problem and solution you suggest? Thanks.
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Re: SN-MQ7 and SN-MQ9

Postby ober » Wed Apr 29, 2015 9:09 am

If you check the schematic and the datasheet, the VCC and GND is connected to the heating coil, and most of the coil is low resistance. If you use continuity test, you will get buzzer when resistance is low, try use low resistance test instead, example 200 ohm.
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www.cytron.com.my
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Re: SN-MQ7 and SN-MQ9

Postby junseen » Wed Apr 29, 2015 7:22 pm

Thanks for your explanation. In overall, even both pins are connected to heating coil there will be no problem for the sensor to use?
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