I have a Raspberry Pi 3 but no HDMI cable but I do have a 2560 mega Arduino. I read a couple of places that Arduino has an onboard ttl chip.
on the Arduino I shorted reset to gnd (which should of put it into the proper mode) I connect tx1/rx0 on the arduino with pin 8 and 10 on the Pi https://pinout.xyz/# then ground to gnd and 5.5v to pin 4
when I set minicom to /dev/ttyAMC0 (the same device that appears in Arduino normal mode), minicom just locks up.
How do I connect to a Raspberry Pi via rs232 using Arduino as a serial to USB bridge on Linux?
the Pi 3 appears to be DOA. I found HDMI and get a black screen upon power on.