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problem with ntc thermistor and Aref

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M

mah

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I have problem when i read from ntc thermistor, lcd display -273 C on lcd (proteus) and it doesn't change. that happened when i connect Aref to ground and program ADC REF to internal cap. but if i connect it to 5v and program its refernce to vcc it works fine. what is the problem?​

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