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- There is no material difference in GPIO operation between the Pi2 and Pi3. If you used this set-up on the Pi2 that suggests you have wired something wrong. Perhaps you need to put the Pi2 back and check it still works. The LEDs on a relay reflect the relay circuitry. Not all relays are active high inputs.joan– joan2016-07-26 16:01:50 +00:00Commented Jul 26, 2016 at 16:01
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