I am controlling a stepper motor and an LCD screen from one raspberry pi. Originally, the motor and screen were powered from the 5V output pin on the raspberry pi. I found that this would draw too much power and one or both of the devices wouldn't work.
I have a variable power supply, if I was to set this to 5V can I connect this in either series or parallel to the GPIO pins on the raspberry pi?
Would this cause any damage to the raspberry pi?
(I'm aware that I could just power the Pi from the power supply and that there are other solutions to this get around connecting the PSU to the Pi but that is not what I am asking)