Recently I needed head regulation and it was super easy & cheap to implement using ESP8266 & Blynk. And yes, I know that both exist for a quite long time, but I didn't do "simple analogue in/out IoT" for a long time.

A touchscreen was completely was completely broken. However, screen used to work until I accidentally cut a screen cable during the disassembling process. Therefore, I had to buy both, screen and touchscreen which cost around 20e.

The screen is not the same quality as it used to be, but I am still happy as I disassembled and assembled a the l parts of phone.