Pablerdo
Published © GPL3+

Wireless Laser-Gate Timing System for Track and Field

Costs around $120 USD (incredibly cheap compared to competitors) and uses easy-to-find components.

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Wireless Laser-Gate Timing System for Track and Field

Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×2
RGB LCD Shield Kit, 16x2 Character Display
RGB LCD Shield Kit, 16x2 Character Display
×1
5 mm LED: Red
5 mm LED: Red
×2
5 mm LED: Green
5 mm LED: Green
×2
LED, Blue Green
LED, Blue Green
×2
LDR, 5 Mohm
LDR, 5 Mohm
×6
Speaker: 3W, 4 ohms
Speaker: 3W, 4 ohms
×1
Plastic Enclosure, Project Box
Plastic Enclosure, Project Box
You are going to need some sort of enclosure, it doesn't need to be this one though, I just put it for reference.
×2
SparkFun Transceiver Breakout - nRF24L01+ (RP-SMA)
SparkFun Transceiver Breakout - nRF24L01+ (RP-SMA)
You can use any nRF24L01+, but it has to have the screw-on antenna.
×2
Tripod
×2
Toggle Switch, Toggle
Toggle Switch, Toggle
×3
9V Battery Clip
9V Battery Clip
×3
Keyes laser module
×1
nRF24L01+ 3.3V Regulator
×2

Software apps and online services

Arduino Web Editor
Arduino Web Editor

Story

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Schematics

Custom Laser PCB Schematic

You can also use any laser module or laser you have lying around. But I created my own.

Custom Laser PCB Board

Custom Finish Line PCB Schematic

This is the PCB that goes in the module that sits in the finish line

Custom Finish Line PCB Board

This is the PCB that goes on the finish line module

Custom Start Line PCB Schematic

This is the PCB that goes in the module that sits on the start line

Custom Start Line PCB Board

This is the PCB that sits on the start line

Code

Finish Line Module Code

Upload this into Arduino Uno at the Finish Line Module

Start Line Module Code

Upload this into Arduino Uno at the Start Line Module

Credits

Pablerdo

Pablerdo

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