Difference between revisions of "Hardware: Powering the Pi"
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'''Warning:''' It is important to only use one power source at a time. | '''Warning:''' It is important to only use one power source at a time. | ||
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and through the USB console cable from another power supply. The two power supplies may fight | and through the USB console cable from another power supply. The two power supplies may fight | ||
each other and burn up! | each other and burn up! | ||
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The Pi, scale. and other sensors require 5 VDC and can be powered several ways. 5 VDC can be supplied from a AC mains adapter, an automotive 12 VDC USB adapter, or the power supply on the Hive Interface board. | The Pi, scale. and other sensors require 5 VDC and can be powered several ways. 5 VDC can be supplied from a AC mains adapter, an automotive 12 VDC USB adapter, or the power supply on the Hive Interface board. | ||
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==Back feed through the Pi's USB port== | ==Back feed through the Pi's USB port== | ||
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Back feed through the Pi's USB port with a special USB Type A Male to USB Type A Male cable. | Back feed through the Pi's USB port with a special USB Type A Male to USB Type A Male cable. | ||
##The pico fuse is bypassed. | ##The pico fuse is bypassed. | ||
Revision as of 16:30, 12 March 2016
Contents
Introduction
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 require 5 VDC and can be powered several ways. 5 VDC can be supplied from a AC mains adapter, an automotive 12 VDC USB adapter, or the power supply on the Hive Interface board.
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.
- The pico fuse is bypassed.
- This cable violates and defeats the USB standard.
- 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.
