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Does anyone know how to initialize mq3 alcohol sensor in keil software using c language? To also know how many percentage (range) of the presence of alcohol from someone's breath to be as input? Please help
The sensor neither knows nor cares what microcontroller you use - let alone what language or toolchain:
How to Interface Anything to Anything Else
Have you studied the sensor's datasheet ?
Have you explored the sensor manufacturer's website for support materials - such as examples, tutorials, application notes, etc ?