Pi Zero Bikecomputer

An open-source bike computer based on Raspberry Pi Zero (W, WH) with GPS and ANT+

https://github.com/hishizuka/pizero_bikecomputer

News

2021/4/18 Please reinstall pyqtgraph when using python3-pyqt5 in Raspberry Pi OS (skip check if using).
2021/4/3 Please reinstall openant and pyqtgraph because both libraries are re-forked.

$ sudo pip3 uninstall pyqtgraph
$ sudo pip3 install git+https://github.com/hishizuka/pyqtgraph.git
$ sudo pip3 uninstall openant
$ sudo pip3 install git+https://github.com/hishizuka/openant.git

Abstract
Features
Specs
Comparison with other bike computers
Hardware Installation
Software Installation
Q&A
License
Author

Abstract

Pi Zero Bikecomputer is a GPS and ANT+ bike computer based on Raspberry Pi Zero(W, WH). This is the first DIY project in the world integrated with necesarry hardwares and softwares for modern bike computer. It measures and records position(GPS), ANT+ sensor(speed/cadence/power) and I2C sensor(pressure/temperature/accelerometer, etc). It also displays these values, even maps and courses in real-time. In addition, it write out log into .fit format file.

In this project, Pi Zero Bikecomputer got basic functions needed for bike computers. Next target is to add new functions which existing products do not have!

You will enjoy both cycling and the maker movement with Pi Zero Bikecomputer!

Here is detail articles in Japanese.

Daily update at twitter (@pi0bikecomputer), and my cycling activity at STRAVA.

Features

Easy to make
- Use modules available at famous Maker stores.
- Assemble in Raspberry Pi ecosystems.
- Install with basic commands such as apt-get install, pip and git command.
Customization
- Need only modules you want to use. Pi Zero Bikecomputer detects your modules.
Easy to develop
- Pi Zero Bikecomputer uses same libraries as for standard Linux.
  - Python
  - numpy
  - PyQt5 and PyQtGraph
  - GPSd for GPS modules.
  - CircuitPython libraries for some I2C sensors.
- So, you can run in cross platform environments such as Raspberry Pi OS, some Linux, macOS and Windows.
Good balance between battery life and performance

Specs

Some functions depend on your parts.

General

Specs	Detail	Note
Logging	Yes	See as below
Sensors	Yes	See as below
Positioning	Yes	A GPS module is required. See as below.
GUI	Yes	See as below
Wifi	Yes	Built-in wifi
Battery life(Reference)	18h	with 3100mAh mobile battery(Garmin Charge Power Pack) and MIP Reflective color LCD.

Logging

Specs	Detail	Note
Stopwatch	Yes	Timer, Lap, Lap timer
Lap	Yes	[Total, Lap ave, Pre lap ave] x [HR, Speed, Cadence, Power]
Cumulative value	Yes	[Total, Lap, Pre lap] x [Distance, Works, Ascent, Descent]
Elapsed time	Yes	Elapsed time, average speed(=distance/elapsed time), gained time from average speed 15km/h(for brevet)
Auto stop	Yes	Automatic stop at speeds below 4km/h(configurable), or in the state of the acceleration sensor when calculating the speed by GPS alone
Recording insterval	1s	Smart recording is not supported.
Resume	Yes
Output .fit log file	Yes
Upload to STRAVA	Yes
Live sending	Yes	But I can't find a good dashboard service like as Garmin LiveTrack

Sensors

USB dongle is required if using ANT+ sensors.

Specs	Detail	Note
ANT+ heartrate sensor	Yes
ANT+ speed sensor	Yes
ANT+ cadence sensor	Yes
ANT+ speed&cadence sensor	Yes
ANT+ powermeter	Yes	Calibration is not supported.
ANT+ LIGHT	Yes	Bontrager Flare RT only.
ANT+ Control	Yes	Garmin Edge Remote only.
Bluetooth sensors	No
Barometric altimeter	Yes	An I2c sensor(pressure, temperature) is required.
Accelerometer	Yes	An I2c sensor is required.
Magnetometer	Yes	An I2c sensor is required.
Light sensor	Yes	An I2c sensor is required. For auto backlight and lighting.

Positioning

Specs	Detail	Note
Map	Yes	Support map tile format like OSM. So, offline map is available with local caches.
Course on the map	Yes	A course file(.tcx) is required.
Course profile	Yes	A course file(.tcx) is required.
Cuesheet	Yes	Use course points included in course files.
Search Route	Yes	Google Directions API

Map with Toner Map
- Very useful with 2 colors displays (black and white).
Map with custimized Mapbox
- Use 8 colors suitable for MIP Reflective color LCD.
Course profile

GUI

Specs	Detail	Note
Basic page(values only)	Yes
Graph	Yes	Altitude and performance(HR, PWR)
Customize data pages	Yes	With layout.yaml
ANT+ pairing	Yes
Adjust wheel size	Yes	Set once, store values
Adjust altitude	Yes	Auto adjustments can be made only once, if on the course.
Language localization	Yes	Font and translation file of items are required.
No GUI option	Yes	headless mode