Video link: [Homemade] This may be the most powerful DIY bicycle computer you have ever seen

1.54-inch screen version: X-Track computer 1.54-inch screen version

The screen was changed to 1.3 inches, and the tb GPS module was not used. The GPS module was integrated on the screen PCB. The star search time is about 3 minutes, and the maximum connection is 10 stars (window sill with metal anti-theft net). The power supply is changed to tps63000 automatic step-up and step-down (the actual one used is tps63001, fixed 3.3v output version, R11-0 ohm, R10 is not installed).

Designed to use a 400mAh battery (582728), the battery life is only 3 hours (discharged to the battery protection board protection voltage).

Only half of the shell is drawn (the attachment is in fusion360 format, the software cannot be logged in, and I will upload it when I can log in). I am too lazy, and I also feel that the design is too thick (it is already 20mm+ not including the shell). Basically gave up.

Today I can log in to fusion360, but the level is not good, so I can only unbox it. I think it’s pretty ugly even when I look at it. .

Some purchase links:

GPS module: Zhongke Micro ATGM336H-5N31 5N71 5NR32 GPS Beidou dual-mode module can be saved after power failure

GPS antenna: Active GPS Beidou dual-frequency positioning ceramic antenna 28DBi high-gain UAV module GPS positioning antenna (4mm, 1st generation ipex, A type 20*6mm)

Connector: 1.27mm SMD simple horn socket board to board DC3-/20/30/40/60/80/100P with column

The following is the original introduction

X-TRACK

Open source GPS bicycle computer.

Has an offline map showing real-time location.

Supports recording and displaying real-time trajectories and exporting trajectory files in standard GPX format.

Newly designed "page life cycle management" and "message subscription publishing framework" .

Demo video: https://www.bilibili.com/video/BV1GB4y1K7VV

GUI

LVGL V8

Hardware Configuration

• 1. Main control: AT32F403ACGU7 (Main frequency: 240MHz RAM: 224KB ROM: 1MB)
• 2. Screen: ST7789 IPS 1.54inch SPI interface 240x240 resolution 60Hz refresh rate
• 3.Storage: Micro SD CARD 32GB
• 4.Input device: rotary encoder
• 5.RTC: MCU built-in RTC clock
• 6. Accelerometer: LSM6DSM (supports hardware step counting output)
• 7. Geomagnetometer: LIS3MDL
• 8.GPS: ATGM336H (BDS + GPS + GLONASS + GALILEO + QZSS + SBAS)
• 9.Battery: Li-ion 3.7V 683030 700mAh
• 10.Power management: LP5907-3.3 + MCP73831
• 11. Shell: 3D printing light curing

Function

• 1.Support speed, distance, time, calories and heading display
• 2. Has an offline map , supports display of real-time location, and supports zooming
• 3.Support step counting
• 4. Support latitude, longitude and altitude display
• 5. Support RTC automatic calibration based on GPS
• 6. Supports recording tracks and can export files in GPX format
• 7. Supports automatic saving of data (JSON format file) when power is off
• 8. Four hours of battery life (continuous work, always on screen)
• 9. Supports simulation in PC simulator and debugs without hardware (configured as Release x86 )
• 10. Support display of real-time trajectory
• 11.To be continued...