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  • this may help ... electronics.stackexchange.com/questions/562412/… Commented Sep 8, 2023 at 19:16
  • Well, that is helpful ! I still need to really understand it but this link seems to help a lot: gammon.com.au/forum/?id=14175 Commented Sep 10, 2023 at 15:22
  • look at the "initial case" circuit ... change arduino input to arduino output .... add arduino input to switch pin 1 Commented Sep 10, 2023 at 17:57
  • Yup, I got it but I still would like to understand why it "sinks" the tension... Commented Sep 11, 2023 at 6:46