I have an UNO set up as a programmer for my Pro Minis.... the way I always do it
RX-RX, TX-TX, Ground - Ground.
Uno reset held low.
Always works fine.
Yesterday, it all failed and I just cannot fix it.
Changed out the UNO twice and tried 3 new Pro Minis.
Nothing connected to the Pro mini except RX,TX and a supply. Removed all the other circuitry.
The code will read (progress bar runs across the screen), but then hangs at the write part of the process.
It shows 'write', and then the progress bar just hangs.
Any ideas? I spend more time troubleshooting programming these damn things than I do the actual code