Compact and portable lap timer, capable of measuring time on:
- Closed-loop tracks (1-gate mode)
- Start/finish tracks (2-gate mode)
Infrared light barriers are used as optical triggers to detect when an object crosses the start or finish line.
- High accuracy using STM32 hardware timers
- OLED display for showing lap times
- Two operating modes: 1-gate or 2-gate
- Modulated IR system (38 kHz) for ambient light immunity
Design: ✅ --> Fabrication & Assembly: ✅ --> Bring-up: ✅
Simplified arhitecture of the Lap Timer is shown on the block diagram bellow:
This project contains 3 custom PCBs:
- Timer board: main PCB of the system, responsible for time measurement and displaying results
- Transmitter board: generates the modulated IR light beam for the optical barrier
- Receiver board: (used only in 2-gate mode) detects the IR signal and triggers the timer
Each board has a custom-designed 3D printed enclosure.
- KiCad - Schematic and PCB design
- Autodesk Fusion 360 - 3D modeling
- STM32CubeIDE - STM32 firmware development (build/flash/debug)
- Dominik Pluta:
- Responsibility: Timer board
- Mateusz Gwioździk:
- Responsibility: Transmitter board
- Radek Mierzwa:
- Responsibility: Receiver board