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- 2i think that you are misunderstanding how the circuit is wired ... one side of a lamp is connected to the +V ... the other side of the lamp is connected to an open collector AUX output ... the output gets pulled low to light a lamp .... connect arduino ground to decoder ground ... connect the AUX3 to arduino data pin ... do not connect lamp to AUX3 ... enable arduino internal pullup resistor .... AUX output acts like a switch that connects AUX to groundjsotola– jsotola2021-04-11 23:58:31 +00:00Commented Apr 11, 2021 at 23:58
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