Pi Zero Bikecomputer

An open-source bike computer based on Raspberry Pi Zero (W, WH, 2 W) with GPS and ANT+.

https://github.com/hishizuka/pizero_bikecomputer

News

2024/6/21 Changed the value for display in setting.conf when using JDI/Sharp MIP LCD. See modules/display/display_core.py for setting values.
- MIP_JDI_color_400x240
- MIP_JDI_color_640x480
- MIP_Azumo_color_272x451 (WIP)
- MIP_Sharp_mono_400x240
- MIP_Sharp_mono_320x240
2024/6/21 Vertical layouts is avaiable. Set from the initial display resolution at startup. If you want to try it in a desktop environment, change DEFAULT_RESOLUTION in modules/display/display_core.py. For individual hardware displays, specify the appropriate value.

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

Abstract

Pi Zero Bikecomputer is a GPS and ANT+ bike computer based on Raspberry Pi Zero(W, WH, 2 W). This is the first DIY project in the world integrated with necessary hardwares and software 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.

Summary

Specs	Support	Detail
Logging	Yes	See below.
Sensors	Yes	ANT+ sensors and I2C sensors. See below.
Maps and navigations	Yes	A GPS module or the Android app GadgetBridge is required. See below.
GUI	Yes	Implemented using PyQt. See below.
Wifi & Bluetooth	Yes	Using built-in modules.
Smartphone connections	Yes	Android only. Mirroring notifications and getting locations via GadgetBridge.
Battery life(Reference)	18h	with 3100mAh mobile battery(Garmin Charge Power Pack) and MIP Reflective color LCD.

Logging

Specs	Support	Detail
Stopwatch	Yes	Timer, Lap, Lap timer
Average value	Yes	[Total, Lap ave, Pre lap ave] x [HR, Speed, Cadence, Power], [3s, 30s, 60s] x [HR, Power]
Cumulative value	Yes	[Total, Lap, Pre lap] x [Distance, Works, Ascent, Descent]
Gross	Yes	Elapsed time, gross 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	Recording continues even if the power is suddenly turned off and restored.
Output .fit log file	Yes	The standard format used by famous services as Strava and Garmin Connect. Also .csv format output is supported.
Upload	Yes	Strava, Garmin and Ride with GPS.
Live Track	Yes	Track data is uploaded in real time to ThingsBoard.io dashboard service, so you can share your activity with friends and family.

Dashboard(ThingsBoard) example

Sensors

USB dongle is required if using ANT+ sensors.

Specs	Support	Detail
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.
ANT+ Environment	Yes	Garmin tempe (temperature sensor)
Bluetooth sensors	No	developping now...
Barometric altimeter	Yes	I2C sensor(pressure, temperature)
Accelerometer	Yes	I2C sensor
Magnetometer	Yes	I2C sensor
Light sensor	Yes	I2C sensor. Use for auto backlight and lighting.

Maps and navigations

Specs	Support	Detail
GPS module	Yes	UART GPS module(via GPSd) and I2C GPS are supported.
Positioning from smartphones	Yes	Using the Android app GadgetBridge.
Map	Yes	Support raster map tile format like OSM (z/x/y.png or jpg). So, offline map is available with local caches. Also, raster .mbtile format is supported.
Course on the map	Yes	Local file(.tcx), or cloud course from Ride with GPS with internet connection.
Search route	Yes	Google Directions API
Course profile	Yes
Detect climbs	Yes	Like Garmin ClimbPro. Only climbs on the course, not detect nearby climbs.
Cuesheet	Yes	Use course points included in course files(.tcx).
Map overlay	Yes	Heatmap (Strava / Ride with GPS) and weather(rain / wind).

Map example

Map and Course Profile with detecting climbs.

Heatmap overlay

Strava heatmap.

Weather map overlay

RainViewer and openportguide are available worldwide.

In Japan, 気象庁降水ナウキャスト(rain) and SCW(wind) are available.

GUI

Specs	Detail	Note
Basic page(values only)	Yes
Graph	Yes	Altitude and performance(HR, PWR, W prime balance)
Customize data pages	Yes	With layout.yaml
ANT+ pairing	Yes
Select course	Yes	local .tcx file and Ride with GPS.
Upload activity	Yes	Strava, Garmin and Ride with GPS.
Select map	Yes	maps and overlays(heatmap and weather)
Adjust parameter	Yes	wheel size, altitude, CP and W prime balance
Network setting	Yes	Toggle wifi and BT, BT tethering.
Language localization	Yes	Font and translation file of items are required.
No GUI option	Yes	headless mode