RaspberryPi/UART

Powering the Raspberry Pi

The UART connector can also power the Raspberry Pi. However, do not connect two power sources! The two scenarios shown below are alternatives.

RaspberryPi_UART_POWER.JPG

Raspberry Pi B+ powered via UART/serial cable:

In this case, you should not connect USB power.

RaspberryPi_UART_and_USB_power.JPG

Raspberry Pi B+ connected via UART/serial cable, but powered through USB:

In this case, you should not power the Raspberry Pi via UART (i.e. do not connect the red cable on the UART connector).

Similar image, for model B from http://elinux.org/RPi_Serial_Connection

http://aperiodic.net/screen/quick_reference

RaspberryPi_UART_Ethernet.JPG

In both scenarios above, the ethernet cable can be connected as well. The picture below shows Raspberry Pi B+ connected via UART/serial cable and ethernet cable, powered through USB:

If you remove the USB power supply, you could also power the Raspberry Pi using the red UART cable.