No1sonuk Posted May 17, 2021 Posted May 17, 2021 1 hour ago, crash test pilot said: Ok, these have two common ground pins. Use one of these for ground contact, and the +5v pin for the signal. Do not attach to +5v on your arduino. They have build-in resistors so you do not need extra resistor. Looks like it's intended for making it easier to daisy-chain the gnd connections so only one is needed on the driver board.
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