Leaderboard

You still haven't told wich power (ac/dc, voltage, current) you'll be switching. Anyway, there's no need for an extra µC here, unless your requirements exceed what can be handled by easily found cheep devices. https://fr.aliexpress.com/w/wholesale-usb-to-8-relays.html

Understand now what the issue is you were solving! thanks for that and I have uploaded an updated zip file to also handle the Strings AutoComplete correctly. It also fixes the Removing the rest-string in case that is equal to the end of the AutoComplete word.

A microcontroller would easily solve this, atmega 328p for example. There are several communication UDF's that would be very easy to adapt, you could use an Arduino UNO via the USB port or communicate directly with the 328p via serial Rx/Tx.

More information is needed: 1/ which kind of charge these "switches" are going to power (AC or DC, voltage, current)? 2/ how many "switches" do you need? 3/ which port are available to drive your "switches" (USB, serial, //, other)? 4/ how this interface will be powered (from USB, from an external adapter, battery)? 5/ how frequent are the changes (once per ms, once per s, once per hour, once a month,...)? 6/ do you care about cosmetic (a pretty ad-hoc box) or is a hobby-style device OK? 7/ what is your budget for the hardware part? Depending on your 7 answers, there can be several solutions, ready-made or more DIY.

Take webcam input and process the content with OpenCV (or something similar) to look for your colors in different regions of your screenshot. OpenCV it's well documented and there is an UDF that support most if not all functions available.

modified verision: WebcamDS_UDF.zip