Pomodoro Timer with an Arduino and an LCD Screen

Looking for more productivity, here is how to make a simple pomodoro timer prototype with LEDs and an LCD screen.

BeginnerShowcase (no instructions)1 hour5,425

Pomodoro Timer with an Arduino and an LCD Screen

Things used in this project

Hardware components

Arduino UNO

Jumper wires (generic)

LED (generic)

LCD screen

10k ohm potentiometer

Resistor 220 ohm

Software apps and online services

Arduino IDE

Story

Looking for more productivity? I have a pretty cool solution for you!

Increase your old projects...

Most of the prototype come from an old project, very easy to build. I just added 2 LEDs, a green one and a red one.

The LEDs

The green LED indicate that you can have a break

The red LED indicate that you should work

Those LEDs are connected to the pin 6 (for the green) and to the pin 7 (for the red one). Of course, this connection can be modified in the code.

/!\ Don't forget to add a 220ohm resistor in front of each LED to avoid too much current.

In the following code, you can adjust the values of your work time and your rest time at the beginning, by modifying WORK_TIME_MIN and REST_TIME_MIN.

pomodoro_timer

#include <LiquidCrystal.h>

/*MODIFY THOSE VALUES TO ADAPT THE TIMER*/
const int WORK_TIME_MIN = 15;
const int REST_TIME_MIN = 5;

/*LCD INITIALISATION*/
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

/*VARIABLES*/
signed short minutes, secondes, types;
signed short periodType = 0; // periodType == 0 : work time; periodType == 1 : rest time
char timeline[16];

void setup() {
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  lcd.begin(16, 2);
  lcd.print("Time spent :");

  digitalWrite(6, LOW);
  digitalWrite(7, HIGH);
}

void loop() {

  lcd.setCursor(0, 1);
  sprintf(timeline, "%0.2d mins %0.2d secs", minutes, secondes);
  lcd.print(timeline);

  delay(1000);
  secondes++;

  if (secondes == 60)
  {
    secondes = 0;
    minutes ++;
  }
  /*PASSAGE TRAVAIL VERS REPOS*/
  if ((minutes == WORK_TIME_MIN) && (periodType == 0)) /*15*/
  {
    minutes = 0;
    periodType = 1;
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
  }

  /*PASSAGE REPOS VERS TRAVAIL*/
  else if ((minutes == REST_TIME_MIN) && (periodType == 1)) /*5*/
  {
    minutes = 0;
    periodType = 0;
    digitalWrite(6, LOW);
    digitalWrite(7, HIGH);
  }

}

Credits

Hugo Blanc

4 projects • 11 followers

Student learning computer science and electronics {thinks out of the brackets}

Pomodoro Timer with an Arduino and an LCD Screen