Published June 15, 2020 © GPL3+

Hand wash timer

¡Easy Hand washing ! with I2C LCD

IntermediateFull instructions provided1 hour644

Things used in this project

Hardware components

5 mm LED: Red

5 mm LED: Green

SparkFun Pushbutton switch 12mm

Buzzer

active

Breadboard (generic)

Jumper wires (generic)

4 male/female the rest male / male

Arduino UNO

Resistor 10k ohm

Resistor 221 ohm

DFRobot I2C 16x2 Arduino LCD Display Module

Software apps and online services

Arduino Web Editor

can be both

Story

This project is a simplified handwashing timer with basic components, I have thought it because I wanted to do a project to prevent covid but simple, low cost and accessible in arduino stores.

This project works like this: press the button and the code will turn it on, the timer will start counting, it will last 20 seconds and it will start ringing when finished.

An image

How to build the project:

1. Ride the lights.

The red led connected to pin 13, green led to pin 12 and both connected to ground with a resistance and gnd connect to the negative side of the bread board

2. Mount button.

Connect pin 5v to the positive part of the breadboard also connect to pin 10 with 10k ohm resistance to ground

3. Mount the buzzer

connect pin 11 to positive part and with ground wire

4. Finally place the LCD I2C like this:

SDA to SDA

SCL to SCL

VCC to 5V

GND to GND

And so it is done

Code

code

#include <Wire.h>                 
#include <LiquidCrystal_I2C.h>  //libraries for lcd

LiquidCrystal_I2C lcd(0x27,16,2); 
                                 
//we define variables and constant variables
int ledr=13;//red led
int ledg=12;//green led
const  int Buzzer = 11 ;//nuestro zumbador activo
int btn = 10;// our button

void setup(){
 //we define the outputs
 pinMode(ledr, OUTPUT);
 pinMode(ledg, OUTPUT);
 pinMode(Buzzer,OUTPUT);
 //and the inputs
 pinMode(btn,INPUT);
 //we start the lcd
   lcd.init();                     
  lcd.backlight();
      lcd.setCursor(0, 0); 
      lcd.print("start      ");  
 }
void loop(){
  // leemos el valor del boton si esta encendido inicia la cuenta
if (digitalRead(btn)==HIGH){ 
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, HIGH);
delay(500);
lcd.setCursor(0, 0); 
lcd.print("20 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("remember  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("19 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("this can  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("18 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("save your ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("17 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("life      ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("16 seconds");    
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("15 seconds");
lcd.setCursor(0, 1); 
lcd.print("remember  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("14 seconds");
lcd.setCursor(0, 1); 
lcd.print("this can  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("13 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("save your ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("12 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("life      ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("11 seconds");    
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("10 seconds"); 
lcd.setCursor(0, 1); 
lcd.print("remember  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("9 seconds "); 
lcd.setCursor(0, 1); 
lcd.print("this can  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("8 seconds ");  
lcd.setCursor(0, 1); 
lcd.print("save your ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("7 seconds ");
lcd.setCursor(0, 1); 
lcd.print("life      ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("6 seconds ");    
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("5 seconds ");  
lcd.setCursor(0, 1); 
lcd.print("remember  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0);
lcd.print("4 seconds "); 
lcd.setCursor(0, 1); 
lcd.print("this can  ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("3 seconds "); 
lcd.setCursor(0, 1); 
lcd.print("save your ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("2 seconds ");  
lcd.setCursor(0, 1); 
lcd.print("life      ");
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("1 second  ");    
digitalWrite(ledr, HIGH);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
delay(1000);
lcd.setCursor(0, 0); 
lcd.print("successful");
lcd.setCursor(0, 1); 
lcd.print("washing   ");
digitalWrite(ledr, LOW);
digitalWrite(ledg, HIGH);
digitalWrite(Buzzer, HIGH);
delay(500);
lcd.setCursor(0, 0); 
lcd.print("successful");
lcd.setCursor(0, 1); 
lcd.print("washing   ");
digitalWrite(ledr, LOW);
digitalWrite(ledg, HIGH);
digitalWrite(Buzzer, LOW);
delay(500);
lcd.setCursor(0, 0); 
lcd.print("successful");
lcd.setCursor(0, 1); 
lcd.print("washing   ");
digitalWrite(ledr, LOW);
digitalWrite(ledg, HIGH);
digitalWrite(Buzzer, HIGH);
delay(500);
lcd.setCursor(0, 0); 
lcd.print("successful");
lcd.setCursor(0, 1); 
lcd.print("washing   ");
digitalWrite(ledr, LOW);
digitalWrite(ledg, HIGH);
digitalWrite(Buzzer, LOW);
delay(500);
lcd.setCursor(0, 0); 
lcd.print("can go out");
lcd.setCursor(0, 1); 
lcd.print("          ");
delay(5000);
}
else {
digitalWrite(ledr, LOW);
digitalWrite(ledg, LOW);
digitalWrite(Buzzer, LOW);
lcd.setCursor(0, 0); 
lcd.print("start      "); 
}
}

Credits

newproyecto

3 projects • 4 followers

Hello everyone, my name is Antonio and I love programming and doing projects with Arduino and I hope these projects will help you.

Hand wash timer

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

mighty_uusam_4r5FeEjxUo.png

Code

code

Credits

newproyecto

Comments

Embed the widget on your own site

Hand wash timer

Hand wash timer

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

mighty_uusam_4r5FeEjxUo.png

Code

code

Credits

newproyecto

Comments

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