https://github.com/peterhinch/micropython-micropower

Support for building ultra low power systems based on the Pyboard (1.x and D series).
https://github.com/peterhinch/micropython-micropower

embedded micropython

Last synced: 3 months ago
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Support for building ultra low power systems based on the Pyboard (1.x and D series).

• Host: GitHub
• URL: https://github.com/peterhinch/micropython-micropower
• Owner: peterhinch
• License: mit
• Created: 2015-09-02T06:24:39.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2023-09-11T16:00:05.000Z (about 1 year ago)
• Last Synced: 2024-04-22T13:31:31.058Z (7 months ago)
• Topics: embedded, micropython
• Language: Python
• Homepage:
• Size: 2.28 MB
• Stars: 44
• Watchers: 13
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-micropython - Pyboard micropower - Tutorial and code for low power applications on Pyboard 1.x and Pyboard D. (Tutorials / Utilities)

README

        
# Reducing Pyboard system power consumption

This repository is specific to STM systems. It primarily supports Pyboard 1.x

and Pyboard D. An alternative micropower architecture is to use ESPNow with

ESP8266 or ESP32. [This document](https://github.com/peterhinch/micropython-mqtt/tree/master/mqtt_as/esp32_gateway)

describes an MQTT client suitable for long term battery operation.

The Pyboard can be used to build systems with extremely low power consumption,

and it is possible to build systems capable of running for over a year on

standard batteries such as AA cells or even coin cells. With the Pyboard 1.x

series, achieving the lowest possible power consumption where peripheral

devices are attached requires a little additional hardware. The Pyboard D

overcomes this requirement by virtue of a software switchable 3.3V regulator

which also powers the I2C pullups.

Broadly there are two approaches, depending on the acceptable level of power

consumption. If an idle current in the range of 500uA to 1mA is acceptable,

code can be largely conventional with `pyb.stop()` being employed to reduce

power consumption during periods when the Pyboard is idle.

For the lowest possible power consumption `pyb.standby()` must be used, cutting

consumption to around 6μA. With external hardware on the Pyboard 1.x or via the

switchable regulator on the D series the peripherals may be turned off ensuring

that the entire system uses only this amount. The drawback of `standby` is that

on waking the Pyboard restarts as if from a reboot. This introduces potential

difficulties regarding determining the source of the wakeup and the storage of

program state while sleeping.

Two sets of resources are provided to assist with the development of low power

solutions.

### Hardware

[hardware](./HARDWARE.md) A discussion of techniques to minimise power

consumption including ways to shut down attached devices, calculation of

battery usage and measurements of results. A schematic for a typical system is

provided with accompanying PCB layout. 

### Software

[upower](./UPOWER.md) This documents `upower.py`, a module providing access to

features of the Pyboard SOC which are currently unsupported in the official

firmware. Some of these features may be of wider use, such as using the battery

backed RAM to store arbitrary Python objects and accessing the RTC registers.

All code is issued under the [MIT license](./LICENSE)