* Set up a uart interface - based on 

  https://www.circuitbasics.com/how-to-set-up-uart-communication-for-arduino/

https://appelsiini.net/2011/simple-usart-with-avr-libc/

https://www.nongnu.org/avr-libc/user-manual/group__avr__stdio.html



* You can download EAGLE under Fusion 360 for personal use subscription

  https://www.autodesk.com/products/eagle/free-download?plc=F360&term=1-YEAR&support=ADVANCED&quantity=1


  Included with a Fusion 360 for personal use subscription, EAGLE free download is a limited version
  for hobbyists including 2 schematic sheets, 2 signal layers, and an 80cm2 (12.4in2) board area.


Outstanding Reference For Arduino UNO
We can run directely off 12V


https://www.circuito.io/blog/arduino-uno-pinout/#:~:text=Arduino%20Uno%20pinout%20-%20Power%20Supply.%20There%20are,manufacturer%20recommends%20to%20keep%20it%20between%207-12%20volts.

Power Adaptor Plug


https://www.digikey.com/en/products/detail/sparkfun-electronics/PRT-10287/6163698?utm_adgroup=Between%20Series%20Adapters&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Connectors%2C%20Interconnects&utm_term=&utm_content=Between%20Series%20Adapters&gclid=CjwKCAiAxKv_BRBdEiwAyd40N0bJtBxeSVcgx0vxMOGOxmguH4G0ZBsaTooDSHsyMqSgVnQi_acThxoCSXIQAvD_BwE


Cheap PC Boards

https://www.pcbway.com/helpcenter/technical_support/Generate_Gerber_files_in_Eagle.html