tRPOf with Trinket - updated

This article is about a RPOf circuit for the Raspberry Pi using a Trinket, thus the name  tRPOf.
The main difference from previous ones, is that this project uses a standard Adafruit Trinket as microcontroller instead the MSP430 in order to use "off the shelf" components with less effort of programming and a LiPo charger/USB DC/DC converter..

Raspberry Pi - RPOf project

The Raspberry Pi can be used to run some kind of embedded Linux.
Like any *nix system, removing suddenly power is not a  good thing, it is very easy to corrupt  some SD card sector if the power removal happens during a writing cycle.