{"id":41160,"date":"2014-08-14T10:00:27","date_gmt":"2014-08-14T14:00:27","guid":{"rendered":"http:\/\/lemasney.com\/consulting\/?p=41160"},"modified":"2025-11-14T22:37:10","modified_gmt":"2025-11-15T03:37:10","slug":"arduino-based-five-ten-egg-timer","status":"publish","type":"post","link":"https:\/\/lemasney.com\/consulting\/2014\/08\/14\/arduino-based-five-ten-egg-timer\/","title":{"rendered":"Arduino Based Five Ten Egg Timer"},"content":{"rendered":"

I love the five-ten egg. It’s a hard-boiled egg that leaves the yolk just a bit soft and the outside done. Simply boil water, drop your egg, and watch your time. At 5 minutes, ten seconds, pull and ice bath the egg to stop cooking. Peel, enjoy.<\/p>\n

I have been relearning my Arduino chops, and one of the ways that I’ve done this is by recreating the Arduino starter kit projects, including one for a digital hourglass.<\/p>\n

I decided to repurpose the digital hourglass to light an LED each minute through five minutes, then blink the last LED for ten seconds. Here is the circuit:<\/p>\n

\"Arduino<\/a>

Arduino Five Ten Egg Timer – John LeMasney<\/p><\/div>\n

Here is the code:<\/p>\n

\/*
\nArduino Starter Kit example
\nProject 8 – Digital Hourglass, modified to a Five-Ten egg timer.<\/p>\n

This sketch is written to accompany Project 8 in the
\nArduino Starter Kit<\/p>\n

Parts required:
\n10 kilohm resistor
\nsix 220 ohm resistors
\nsix LEDs
\ntilt switch<\/p>\n

Created 13 September 2012
\nby Scott Fitzgerald<\/p>\n

Modified 13 August 2014
\nby John LeMasney<\/p>\n

https:\/\/store.arduino.cc\/usa\/arduino-starter-kit<\/p>\n

This example code is part of the public domain
\n*\/<\/p>\n

\/\/ named constant for the switch pin
\nconst int switchPin = 8;<\/p>\n

unsigned long previousTime = 0; \/\/ store the last time an LED was updated
\nint switchState = 0; \/\/ the current switch state
\nint prevSwitchState = 0; \/\/ the previous switch state
\nint led = 2; \/\/ a variable to refer to the LEDs<\/p>\n

\/\/ 60000 = 1 minutes in milliseconds
\nlong interval = 60000; \/\/ interval at which to light the next LED<\/p>\n

void setup() {
\n\/\/ set all of the LED pins as outputs
\nfor(int x = 2;x<8;x++){
\npinMode(x, OUTPUT);
\n}
\n\/\/ set the tilt switch pin as input
\npinMode(switchPin, INPUT);
\n}<\/p>\n

void loop(){
\n\/\/ store the time since the Arduino started running in a variable
\nunsigned long currentTime = millis();<\/p>\n

\/\/ compare the current time to the previous time an LED turned on
\n\/\/ if it is greater than your interval, run the if statement
\nif(currentTime – previousTime > interval) {
\n\/\/ save the current time as the last time you changed an LED
\npreviousTime = currentTime;
\n\/\/ Turn the LED on
\ndigitalWrite(led, HIGH);
\n\/\/ increment the led variable
\n\/\/ in 1 minute the next LED will light up
\nled++;<\/p>\n

if(led == 6){
\n\/\/ the 5 minutes is up, light up fifth LED, then blink last LED for ten seconds, then leave solid.
\ndigitalWrite(6,HIGH);
\nfor(int b = 1;b<6;b++){
\ndigitalWrite(7,HIGH);
\ndelay(1000);
\ndigitalWrite(7,LOW);
\ndelay(1000);
\n}
\ndigitalWrite(7,HIGH);
\n}
\n}<\/p>\n

\/\/ read the switch value
\nswitchState = digitalRead(switchPin);<\/p>\n

\/\/ if the switch has changed
\nif(switchState != prevSwitchState){
\n\/\/ turn all the LEDs low
\nfor(int x = 2;x<8;x++){
\ndigitalWrite(x, LOW);
\n}<\/p>\n

\/\/ reset the LED variable to the first one
\nled = 2;<\/p>\n

\/\/reset the timer
\npreviousTime = currentTime;
\n}
\n\/\/ set the previous switch state to the current state
\nprevSwitchState = switchState;
\n}<\/p><\/blockquote>\n

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