I need to send messages through some old lowgauge wiring. Maybe you need to do something similar where wire gauge and number is limited. Here's a neat way to do this using UART and the Raspberry Pi Pico (not the wifi version, so cheaper). I'll be adding more components of time to this build just to show how you can expand it over time and get it to do different things.

If you want to pick up your own Raspberry Pi Pico, please use the link below, it helps me (and the pair is $14)!
https://amzn.to/3lIMTXz

micropython code for this build:
https://github.com/SmarterCircuits/Si...

Please consider donating
https://www.gofundme.com/f/helpmebu...
or becoming a Patron
  / smartercircuits  

I have to put it out there because gadgets don't fall from the sky and I'd like to keep exploring and building Smarter Circuits with you. I put some behind the scenes exclusive stuff up for Patrons as well as early access to videos and other perks listed on the Patreon.