Stopwatch
Published
Creating a stopwatch with an Arduino and a seven-segment shield
Overview
This page was updated in 2020 to use the SevenSegmentShield library. For a download and more information, follow this guide.
This code uses the Gravitech seven-segment shield.
Code
This is a simple program that counts up every second and displays the counter on the segments, similar to a stopwatch.
/*
Stopwatch
Displays numbers on a seven segment display shield like a stopwatch.
Parts required:
Arduino Uno
Seven segment shield
*/
#include <SevenSegmentShield.h> // Include shield library
#include <Wire.h> // Include Wire library for I2C
Display ds; // Create Display object to use
int count = 0; // The variable to display
void setup() {
Wire.begin(); // Init I2C bus
ds.begin(); // Init display
}
void loop() {
ds.displayInt(count++); // Increment count and display on segments
delay(1000); // Wait one second before continuing
}