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Fixing A Cheap UPS HAT For Your Raspberry Pi With A Tiny Daemon

posted by janrinok on Thursday August 29 2019, @09:27AM   Printer-friendly
from the hat-tip dept.

Arthur T Knackerbracket has found the following story:

An uninterruptible power supply (UPS) isn’t something solely to have hooked up to your desktop PC. Your Raspberry Pi SBC might also benefit from it. Yet the available options aren’t too great, or are too expensive. This leads folk including [Joachim Baumann] to modify cheerfully cheap Chinese UPS HAT[*] boards such as the Geekworm UPS HAT to fix its myriad of issues and missing features.

[...] With [Simon]’s project, a PIC MCU was used to provide a supervisor for the UPS HAT. It also bypasses the HAT’s control over whether the Raspberry Pi gets power or not. The results did however not fit [Joachim]’s needs, so the ATtiny Daemon project was born. This uses some of the fixes [Simon] implemented and adds a daemon that runs on the Raspberry Pi to establish two-way communications between the UPS and OS.

The settings for the UPS are stored also on the HAT, in the MCU’s EEPROM, with the daemon able to update and read it out as needed.

[*] HAT = Hardware Attached on Top. Hat tip to commenters who asked what a HAT was.

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  • (Score: 2) by srobert on Thursday August 29 2019, @02:09PM (3 children)

    by srobert (4803) on Thursday August 29 2019, @02:09PM (#887280)

    Try googling UPS HAT. You get ball caps for UPS drivers.
    OK I think I got that UPS was an Uninterruptible Power Supply.
    But what's a HAT?
    Is this something I'd be aware of if I weren't getting old?

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  • (Score: 4, Informative) by takyon on Thursday August 29 2019, @03:45PM (1 child)

    by takyon (881) <{takyon} {at} {soylentnews.org}> on Thursday August 29 2019, @03:45PM (#887319) Journal

    It attaches to the General Purpose Input/Output (GPIO) pins, covering them and making it easier to extend the hardware.

    https://www.raspberrypi.org/blog/introducing-raspberry-pi-hats/ [raspberrypi.org]

    The Raspberry Pi B+ has been designed specifically with add-on boards in mind and today we are introducing ‘HATs’ (Hardware Attached on Top). A HAT is an add-on board for B+ that conforms to a specific set of rules that will make life easier for users. A significant feature of HATs is the inclusion of a system that allows the B+ to identify a connected HAT and automatically configure the GPIOs and drivers for the board, making life for the end user much easier!

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  • (Score: 3, Informative) by Freeman on Thursday August 29 2019, @04:45PM

    by Freeman (732) on Thursday August 29 2019, @04:45PM (#887357) Journal

    It's RaspberryPi jargon. Best explained, at least the first time mentioned, when writing an article. A HAT (Hardware Attached on Top) in RaspberryPi terms is an accessory that can be directly connected to the RaspberryPi, usually or perhaps always via the GPIO (General-purpose input/output) interface.

    HAT:
    https://www.raspberrypi.org/blog/introducing-raspberry-pi-hats/ [raspberrypi.org]

    GPIO:
    https://www.raspberrypi.org/documentation/usage/gpio/ [raspberrypi.org]

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