Outputs can be used to power LEDs, relays, optop-coupler, gates and much more.


The selected pin will be HIGH when the LED/Gate ist on. Otherwise it will be LOW (0 Volt).

You can reverse this by selecting "Output rev." instead of "Output" during setup.


Connecting an LED is really easy:

       Connect the kathode (short leg) to GND.

       Connect the anode (long leg) to the desired pin via a 220 Ohm resistor


It should look like this.


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