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- Apr 11, 2019
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I would just like some assistance with a relay board
Can I use the DB9 pins as the input pins and the terminal headers 5v and GND for the relay and not connect pin5 of the db9
I'm planning to use the attached relay boards and they require 5v and gnd
I used pins 1 and 2 with an external 5V source to be able to operate my relay, I think that's what you want to do