Toggling between two pairs of LEDs

[alto777]

State Change (or Edge) Detection along with some way to accommodate switch bouncing is an essential first bit of power you can take for yourself.

See this post and the thread it is part of; read the code play with it in the simulator until it makes sense:

Storing Button State

I normally point ppl to the IDE Examples/02.Digital/StateChangeDetection sketch, and the article that goes with it. Here is an adjustment and reduction of that example, which actually works. And somewhat less code to slog through to get the basic idea. One of the original's flaws is that it does not handle Try it here [Wokwi_badge] State Change Detection This code also follows the IPO model, which is a very useful and very used model for many the things we do with the Arduino. IPO Pr…

HTH

a7