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how to interface 1 mq-7 sensor with an at89c51 microcontroller ?

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Majd995

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i used a RL=47Kohm and a pcf8591t adc , i interfaced the analog Vout of the mQ-7 sensor with one of pcf8591 analog input pins then how should i interface the pcf with the 89c51 microcontroller ?
if there any thing wrong with the things that i have interfaced plz tell me ..
this is for my project
and pls i want insructions and a block diagram ...
 
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