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Brandon Wolfram asked Do I have to use all 3 of the ports of the relay sheild?
I'm trying to make a rov and I'm using a relay shield. I only have 2 wires for the motors. There is 3 ports in the shield
And got the following answer:
Four Arduino pins, 4 thru 7, control the four relays on the relay shield. Use them as you need them, but those 4 pins are hooked up to the base of the relay drive transistors, so it wouldn't be advisable to try to use pins 5 and 6 for PWM control of some other device because they are hardwired to those transistors, thus possibly messing up those 2 relays. If you don't need the relay, just don't program an action from the Arduino on those pins.
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