mini arduino ADC problem

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yassin.kraouch

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Please i need help in this mini-arduino Arduino - ArduinoBoardProMini
i have a voltage of 2.14 V ( measured with the multimeter) and when i connect this voltage to the A0 input the voltage become is 1.5V,
have you an idea about this problem ?
 

I don't see a reason for the voltage to drop, are you sure that the pin in set as input?
What is the source of this voltage?
Is it a constant DC?

Alex
 

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