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  • so does your program work when not using pin 20? Commented Jul 14, 2017 at 3:18
  • 1
    @MohammadAli Yup. But once again, it works fine using pin 20 in Python... Commented Jul 14, 2017 at 11:31
  • Somehow both answers overlooked that comment above: if it were a misconfiguration problem, Python would not work either. Commented Dec 7, 2020 at 14:24