UPS Project
Uninterruptible Power Supply for Raspberry Pi This is a blog to share my UPS project. You'll see pictures, code, schematics, and test information. I have never written a blog before so good luck to me! Introduction This uninterruptible power supply was designed to provide operating power to a Raspberry Pi (RPi) computer. It uses a diode switch to select wall power if available, but switch to battery backup automatically should there be a power failure. Battery voltage is supplied by 8xAA Nickel-Metal Hydride batteries. To ensure that power will be available, I selected Tenergy brand Centura Low Self Discharge cells, such as these available from Amazon. They are intended to maintain charge over long periods of storage. The Tenergy AA size battery has built in low self discharge technology that prevents it from losing its power after long storage periods. Once charged, it can be stored for 12-2...