VDosda/Crossfit_Timer

Crossfit Timer with Arduino

CrossFit Timer overview

About this project

Hi !
This project was to build a Crossfit Timer from scratch.
I had the idea during the lockdown (COVID-19) when I was doing sport at home. A Crossfit Timer is better than a phone or a computer and a real one is pretty much expensive.
Modes I did : count up, count down, interval, the possibility to set rounds and a basic clock mode.

Table of contents

• Making
• Electronic
• Code
• Documentation

Making

Softwares :

• Fusion 360
• Cura

3D Printer :

• Alfawise u20
• Black AmazonBasics PLA Filament,1.75mm

Other :

• Black Car Window Foils Tint
• Translucent paper
• M3 Inserts Brass
• M3 Screw
• Brass Standoff Spacer PCB

Electronic

Softwares :

• EasyEDA
• Fritzing

PCB:

• JLCPCB

Components

• Arduino nano
• Real Time Clock (RTC)
• Tactile Push Button
• Resistors
• Capacitors
• Leds SK6812
• Buzzer
• Rechargeable Battery Lipo cells
• Lipo Charger Module
• 5V DC-DC Step-Up Power Module
• Slide switch

Code

Softwares :

• Arduino IDE

Architecture

I splited the code in four parts/files

Main code	Display	Set-up	Timer
Button functions	Leds matrix	Set-up mode functions	Count up/down/interval functions
Setup function	Digit and Alphabet matrix		10 secondes countdown function
Main loop	Timer display functions		Buzzer gestion
			Clock mode

Code and more details

Documentation

There is five buttons ( beginning from the right )

Button	ROLE	Timer is set	Set-up mode	Timer is running	Timer is pause	Clock mode
First	START / PAUSE / OK	Start	Ok	Pause	Start	Nothing
Second	SETUP TIME	Setup mode	Change digits	Nothing	Nothing	Setup mode
Third	UP	Up count mode	Count up	Nothing	Nothing	Nothing
Fourth	DOWN	Down count mode	Count Down	Nothing	Nothing	Nothing
Fifth	RESET / CLOCK MODE	Nothing or after 3 sec clock mode	Nothing	Reset	Reset	After 3 sec timer mode