Hardware: Powering the Pi

Powering the Pi

Warning:  It is important to only use one power source at a time.  
 For example, do not power the Pi through the Micro USB power connector from one power supply
 and through the USB console cable from another power supply.  The two power supplies may fight 
 each other and burn up!

The Pi, scale. and other sensors can be powered several ways.

Operation from 5VDC

5 VDC can be supplied from a AC mains adapter or an automotive 12 VDC USB adapter.

Micro USB power connector on the Pi

This is the safest way to power the system. A USB Type A Male to USB Micro B Male cable plugged into the power connector on the Pi. This is the preferred method as the pico fuse on the Pi board is used. The other end of the Micro USB cable can be plugged into a USB power supply like a cell phone charger, a powered USB hub, or a USB port on a computer.

TTL/USB conversion cable

Through the USB console cable. This is handy for testing and development as the system can be powered from the USB port of another computer. Plug the cable into H4 on the interface board in this order: Red, White, Green, Black.

Back feed through the Pi's USB port

Back feed through the Pi's USB port with a special USB Type A Male to USB Type A Male cable.

1. 1. The pico fuse is bypassed.
   2. This cable violates and defeats the USB standard.
   3. The USB Type A to Type A cable is dangerous to have around. Do not use it to connect two powered devices, such as two laptops, together.