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question for gas sensor(MQ5)

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patece

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could you please help me regarding my problem what will be my VREF and VREF- in the MQ5 gas sensor?. If this will be my problem. Is it possible that I rather use interrupt applying 5 or 0V to specific port pin by using operational amplifier. I am using pic16f877a mcu. Thanks and more power.
 

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