How to use the Gpio for LED

[dernassesmart]

Hello and thank you very much for this excellent repository. It’s fun to follow your guide and build it. I noticed that there is an option for the LED in the configuration file. My question is whether I need to add a resistor in between or if I can simply use any LED. And what about colored LEDs?
Thank you in advance.

[rednblkx]

Hello!

I'm glad you like it.

Note that the LED_PIN in config.h is strictly used by the HomeSpan library as a status LED(see more in their docs). This has been renamed in the dev branch to better reflect its usage.

In the dev branch, among other things, now you have the option to assign a GPIO pin to be actioned on a successful/failed HomeKey Auth if that interests you. I'm still working on things so the wiki won't be updated yet until i've merged dev into main.

Following your question about adding a resistor, unless the board already includes a resistor of the right value on the pin, you should always make sure to add a resistor on the led's anode to not fry it.

Not sure if you are referring to an RGB led, but if you do, that requires 3 separate GPIO pins for each of the colors.

Let me know if you have any other questions.

[dernassesmart]

thank you very much for the detailed answer. i think the dev branch is what i am looking for!