Signalling Pi Zero with Unicorn pHAT

@Unxmaal wrote:

I have a Pi Zero W with a Unicorn pHAT. I’ll probably be powering the Zero via standard USB power adapter.

I’d like to be able to tap a single keyboard-style switch to start (for example) ‘sudo ./rainbow.py’.

I’m guessing I’ll need to add in a resistor and handle the signal via GPIO, but I don’t know how to wire this in alongside the Unicorn pHAT.

Any ideas?

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