I'm basically trying to build my own Arduino Mega with as many shortcuts as possible.
I've had success building the basic circuit, but I had to use a Nano as ISP to upload sketches onto it. My goal is to have some kind of UART to serial circuit i could easily build next to the 2560 chip, so i can have it all on one pcb, where i only have to plug a USB cable into it to program it using Arduino IDE, like a Mega.
i've tried the FT232RL chip, i managed to get it to upload sketches onto a stand alone ATmega328 chip no problem, but not the 2560. I ended up frying my 2560chip and i'm just wondering if it's worth buying a new one.
I've not been able to find much online about how to upload sketches without using a Nano. Does anyone here know of any existing circuits that work? or any other helpful advice? sorry i don't have much info to go on.