Choose relay hole

How it's done

There are two more free pins on relay channel. Which one to connect? Depends on what do you want!

If you want the LED to be connected with power source (middle pin on relay) only when channel is turned on (LOW) then connect it with the 3rd hole (from right).

If you want the LED to be connected even when the relay is off, then connect it with the 1st hole (from top).

Lines near holes on relay board show what the initial state is when relay is off. Two holes are always connected, middle and right or middle and left, only depends if it is LOW or HIGH.

Activity Q&A

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