Multiple TFT Screens from One Dev Board
Posting here as I never found an answer in my searching before attempting this. I am using a single ESP32 dev board and I’ve managed to have it drive x4 of st7796 3.5” TFT displays that I got off Aliexpress. The end goal is to make a 4 faced clock tower so I wanted to have multiple displays. I originally started trying with eInk but that required more wires than GPIOs available and none of the eInk displays played nicely refreshing that often.
Are the screens perfectly refreshing? Not 100% at the same time, but close enough to be functional. They all share a common PWM dimming line. So hopefully this answers someone’s question when they are frantically searching like myself.
Next step is to make a daughter card for the ESP32 to clean up the wiring. Off to OSHPark we go!