Hello,
I'm planning out a project that uses a RP2040 feather (PID 4884) to control 4 RBG matricies in addition to rPi Zero controlling a 5" TFT screen (PID 1680) via the TFT Kippah (PID 2454). I'd like to use an PWM pin off of the RP2040 to control the backlight of the TFT screen via a transistor, but in looking at the schematic of the TFT Kippah, it looks like the way to do this is by cutting the trace from the rPi pin 4&7 and the touch point 7 (TP7 - marked 5V). Replacing this would the modulated 5V supply from the transistor connected via the TP7.
This seems like an inelegant way to do it. Am I missing an enable pin or the like on the TFT Kippah that I could toggle a control signal to instead?
PWM Backlight control of TFT Kippah (PID 2454) using external transistor
Moderators: adafruit_support_bill, adafruit
Please be positive and constructive with your questions and comments.
- Vogon_Poetry
- Posts: 4
- Joined: Wed Sep 17, 2014 3:44 pm
PWM Backlight control of TFT Kippah (PID 2454) using external transistor
- Attachments
-
- TFTKippahMod.PNG (107.53 KiB) Viewed 77 times
Please be positive and constructive with your questions and comments.