I have a 10 pin connector which I'd like to use as the connector between a Pi Zero and a PiTFT 3.5". I've already desoldered the PiTFT headers, and will use a 10 pin header soldered to the PiTFT with a 10 pin connector bridging the gap between Pi and screen.
PiTFT pinout here: https://pinout.xyz/pinout/pitft_plus_35#
However, the PiTFT needs 8 GPIO pins and 3 power pins (5V, 3V3, 0V) which is a total of 11 pins. So my thought was to take the 5V at the PiTFT end (power comes from the Pi) and use a voltage divider soldered directly to the back of the PiTFT which will turn the 5V to 3V3. Is this likely to cause issues? Presumably the 3V3 is used by the PiTFT to communicate with the Pi. If the two seperate 3V3 sources (one on the Pi, one on the PiTFT) are not exactly the same voltage, or not connected together and therefore equalised, are there likely to be any problems? Can I leave them as two seperate 3V3 sources that are not connected?
That's one question - the main one. But also, if the above idea does not work, does the PiTFT really need board pins 18, 22, 24, 26? Is there a way to leave out one of those pins? I'm presuming not.
Of course, I could just add an extra connection between the PiTFT and the main board, but it's neater not to.