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  • Thanks. Can you tell how to post a code better? There is not a A3, in the code, cause of it is default. that's why I don't how to change. Commented Jul 25, 2021 at 0:46
  • I have never done so at this point I will not try to explain it. There are many others that do a better job then I can. ADMUX = 0x03; Is one of the statements I believe you need to change it to ADMUX = 0x00; Let us know how you did? I chased the circuit back to simple circuits where somebody asked the same question. There answer was close to mine. " If you need to change A3 to A0 you must change the analog pin definition in the code" Commented Jul 25, 2021 at 0:59
  • perfect ! charged ADMUX = 0x03 as ADMUX = 0x00, it works. Thank you. Commented Jul 25, 2021 at 1:18
  • Actually, charged ADMUX = 0x03 as ADMUX = 0x02, A2 as input; but charged ADMUX = 0x03 as ADMUX = 0x01, A1-A7 non of as input works! WHY? Commented Jul 25, 2021 at 1:33
  • Did you move the connection to A0? Also check any references to ADMUX. Commented Jul 25, 2021 at 1:35