For some of you the title might seem familiar, as [Patrick Van Oosterwijck] LiFePO4wered/Pi project is a quite successful Hackaday.io project. Now he’s designing from scratch the plus version to fill in some gaps and solve some of the challenges that affected the initial project. So what exactly is LiFePO4wered/Pi+ and what can it do?
In a nutshell, it’s a smart UPS for the Raspberry Pi. The standard version allows a Model A+ and Pi Zero to run on battery for over 2 hours, and the B+, B2 and B3 to run for at least an hour (it maybe less, depending on the system load, of course). It implements two-way communications between the power system and the Raspberry Pi (running the open-source daemon) over the I2C bus. This allows for continuous measurement of the battery voltage and load voltage, with user programmable thresholds for boot, clean shutdown and hard power down. There’s a touch pad that provides clean boot/shutdown capability even in a headless setup, a wake timer allowing the Raspberry Pi to be off for low duty cycle applications and an auto-boot feature to maximize uptime by making the Raspberry Pi run whenever there is sufficient battery power.
That’s the standard version, which we covered last year… what else could the plus version have?
Well, to start, it brings more current to run complete systems with LCD screen and hard drives, the previous version was limited when it came to current. It will provide the option for a wider range of input power sources, such as solar panels, which is pretty nice. The on/off button and the power led will no longer be soldered on the main board so they can ‘relocated’ elsewhere, for example, when making a custom enclosure. Detection of input power to trigger automatic boot and shutdown will be added and last, but not least, a real-time clock with absolute time wake up.
So there it is, the new LiFePO4wered/Pi+ version, with all bells and whistles for the Raspberry Pi enthusiast.