I have an Arduino UNo R3. It won't power up from the "Japan jack" power input.
Plugging in the USB works though. The usb does IMHO not give enough amps for the sensors I'd like to use.
I also tried to input 5V power through Vin and Gnd but get nothing. When using USB for rx/tx and power all digital/analog data pins and 3.3V work fine.
What I'd like is have USB connected for serial output debugging but use a better power supply.
What do I solder and where?
If I solder power in somehow I don't want to get into a situation where plugging in USB causes a conflict (two diffrent v+ and v-).
I am no using the RX/TX pins. I am also thinking that I could solder power from external source and use RX/TX for debugging.
Any pointers and info are appreciated