Hi, just a basic question (to start!): I have a brand new Rainbowduino connected through UART_SBv21. The UART_SBv21 is supplying 5V to the board through the VCC pin when the USB cable is plugged in. Is it OK to connect the Rainbowduino to external 6.5V power on the JST connector at the same time as it is connected to UART_SBv21, or will that fry something? Thanks.
Yes, UartSB and JST can power at same time.
There is a diode D1 can protect the UartSB(PC).