(Links Below)
Following up on    • Use a Raspberry Pi to power and parse...   we are looking at how to allow the Raspberry Pi to talk back to the Arduino. Note: Node-red can be run on a PC and I will cover setting that up in a later video in this playlist.

Arduino Code - https://pastebin.com/msxpLpsM
Node-Red Code - https://pastebin.com/mF7cBbdi
For Node-Red, hit the hamburger menu, click import, click clipboard. Paste the raw contents of the code above and click import.

Pi Starter Kit - https://amzn.to/2MeYtWs
Good SD Card - https://amzn.to/2LHn72Q
Arduino Starter Kit - https://amzn.to/2LHn72Q