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Raspberry Pi Battery Backup How-To @Raspberry_Pi #piday #raspberrypi

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George shares how to make a battery backup circuit for your RPi via repairhub.co.uk:

This is a step by step instructions on how to make a battery backup circuit for your Raspberry Pi computer. For more information about Raspberry Pi visit the Foundation’s website.

First I’d like to explain a little bit about what I tried to achieve with this design and also pros and cons of this approach. I’m using my Raspberry Pi as a backup device with two hard drives connected to it, to back up various online servers that I administer. I use automated backup scripts based on Rsnapshot, and also I’m using this particular Pi as an Apple time machine server. Because Raspberry Pi is a very low power device, I thought it would be possible to design a cheap backup power supply using a 9V rechargeable battery, and this way prevent any abrupt shutdowns during power cuts or when someone accidentally unplugs it from the mains. As an added feature it also will provide a convenient way to safely power the device off without adding a hardware button or logging-in remotely and issuing a shutdown. But what this circuit doesn’t currently do is monitor battery levels, nor provide any kind of low voltage cut off, but there is a time limit/delay after which it will automatically power off and disconnect the battery.

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The finished circuit does the following:

  • Trickle charge the battery while on mains power
  • Send a signal to Pi GPIO pin when mains power is disconnected
  • issue a shutdown after a few minutes if power haven’t returned (Done via software)
  • disconnect the battery from the circuit after shutdown is completed (this is to prevent discharging the battery below its limit)
  • keep a log file with all the time stamps and alerts for mains power, shutdowns and restarts of the Pi

Check out the full tutorial here.


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