Hello,
When Sanguinololu is attached to PC (USB cable) everything works perfectly. When I connect external 12V power supply everything is still fine. Finally I can disconnect USB cable and Sanguinololu keeps on working.
But... I have LCD+SD card and I like to to use printer standalone. When USB cable is not connected and I switch external power supply on Sanguinololu does not work. I can see booting loop on LCD screen every few seconds. Maybe every 1/20 times it starts so it corfirms that the setup is working.
Been trying to add capacitors, pullup resistors to every place I can imageni but no help.
Am I alone with this? I saw similar discussion related to Arduino Uno R2 board.
