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SugarPie is a Python library to drive the PiSugar UPS / Battery.

Project description

Have a piece of SugarPie

SugarPie is a Python library to drive the PiSugar UPS / Battery (

The main motivations to create this library are:

  • The official driver takes the form of a web server, which is not always practical.
  • The official driver does not support all the features of the product (eg: the watchdog).

This library is based upon the official documentation for the PiSugar 3 Series:

Support for other versions of the product may be added later.


Suggested installation is through pip: pip install sugarpie

Make sure I2C is activated on the Raspberry Pi (it is the communication channel used to control the PiSugar). One option to execute the following command on the device: raspi-config nonint do_i2c 0.

You can find some examples in the contrib directory with some systemd services and corresponding Python scripts that use the library.

from sugarpie import pisugar


(Be careful when playing with the system watchdog. When turned on, you need to either stop it or reset it regularly, or the PiSugar will restart the power! You can find a complete example in the contrib/systemd folder.)

Supported Features

The goal is to support all the features advertised officially in the PiSugar documentation. Here is a list of the currently supported features.
You can find more details within the src/ module where each feature should have its corresponding method with a well described docstring.

  • Sytem Watchdog: turn on, turn off and reset the watchdog: pisugar.switch_system_watchdog('on|off') + pisugar.reset_system_watchdog() every < 30 seconds by default.
  • Boot Watchdog: turn on, turn off and reset the watchdog: pisuagr.switch_boot_watchdog('on|off') + pisugar.reset_boot_watchdog() (currently not working on the PiSugar 3 Plus, see this issue)
  • Power Output Switch: turn off the power delivered to the Raspberry Pi with an optional delay: pisugar.switch_power_output(delay in seconds) (Useful for completely cutting power after a shutdown.) (The delay is currently not working on the PiSugar 3 Plus, please see this issue
  • Get the PiSugar temperature: pisugar.get_temperature()
  • Get the PiSugar firmware version: pisugar.get_firmware_version()
  • Get the PiSugar current battery level: pisugar.get_battery_level() (default is percentage, voltage is also availabel with pisugar.get_battery_level(output='voltage'))

How it works

Everything happens over the i2c bus by setting bits at specific addresses. It depends on the SMBus library.

In case you are interested, here is a (incomplete) map of the registers and their corresponding functions: Registers Addresses


Contributions are welcome. The project is organized such as it should be simple to just add new support, withtout having to modify the current structure (trying to respect the SOLID principles).
When contributing, please format your code with Black, or the CI will break.


MIT License.

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