This is from a module I’m using and I don’t understand this part of it. https://files.waveshare.com/upload/3/3c/RP2040-Touch-LCD-1.28.pdf
This is from a module I’m using and I don’t understand this part of it. https://files.waveshare.com/upload/3/3c/RP2040-Touch-LCD-1.28.pdf
It looks like an n channel mosfet connecting the negative pin of the header to ground, with a resistor to keep the gate low (and consequentially keeping the mosfet on) until pulled high by gpio 4