I want to use atmega32 adc i want to use its 4 channel (in single end mode) to convert four analouge signals into digital (one at a time) i have written the c code what i cannot figure out is what should i do with the ground pins of those four analog signals should i common them and give them to controller ground?and why there are two ground pins in atmega 32 (11 and 31) is one of them is for analouge signal ground?
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