Hello all ,
Long time reader first time poster. I have a project which I have a Uno and a RPi communicating via i2c , I am using a portable mobile phone power bank to power both Arduino and RPi from USB/micro USB ports.
But I need to free up the USB port on the arduino to be able to connenct with my computer . I read it's not safe to connect 5v directly to arduino 5v pin.
Can I simply cut a USB wire from my power supply and solder red and black wires to USB socket at PCB (is this called back feeding) ? if I do that, do I have to make sure I use a USB cable with 5V disconnected for data transfer?