jackycppp
Published © GPL3+

Clock using Arduino UNO, 16 x 2 LCD Display, and Switches

My research project on microcontrollers, using a Arduino UNO R3 and other components.

IntermediateWork in progress132
Clock using Arduino UNO, 16 x 2 LCD Display, and Switches

Things used in this project

Hardware components

Single Turn Potentiometer- 10k ohms
Single Turn Potentiometer- 10k ohms
×1
Resistor 220 ohm
Resistor 220 ohm
×1
Resistor 10k ohm
Resistor 10k ohm
×3
Alphanumeric LCD, 16 x 2
Alphanumeric LCD, 16 x 2
×1
Arduino UNO
Arduino UNO
×1
Pushbutton switch 12mm
SparkFun Pushbutton switch 12mm
×3

Story

Read more

Schematics

Use project 9 and 11 from projects book

Replace the tilt sensor in project 11 with the switch from project 9

Looking at the code, the way the button works in project 9 will allow you to use a switch, for this project the switch will adjust hour and minutes.

Code

Code for Arduino

Arduino
This code allows the clock to constantly count seconds while allowing you to press buttons to change the hour or the minute.
unsigned long seconds;
int hour = 1; // what hour the program starts with
int minute = 0;


#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);


const int pinone = 8; // the pin that the arduino is reading
const int pintwo = 13; // the pin that the arduino is reading
const int pinthree = 7; // the pin that the arduino is reading
int state = 0;
int statetwo = 0;
int statethree = 0;

void setup() {
   // put your setup code here, to run once:
Serial.begin(9600);

pinMode(pinthree,INPUT);

lcd.begin(16, 2);
lcd.setCursor (0, 0);
lcd.print("This is a clock");
lcd.setCursor (0, 1);
lcd.print("Time:");
seconds = 0;

}

void loop() {

  state = digitalRead(pinone);
  statetwo = digitalRead(pintwo);
  statethree = digitalRead(pinthree);
  
  // put your main code here, to run repeatedly:
Serial.print("Time: ");

Serial.println(seconds);
delay(1000); // 1000 milliseconds = 1 second
seconds=seconds+1;


lcd.setCursor(13,1);
lcd.print(seconds); // display seconds
lcd.print("s");  // 1 second passes


lcd.setCursor(10,1);
lcd.print(minute); // display minutes
lcd.print(":");


lcd.setCursor(7,1);
lcd.print(hour); // display hour
lcd.print(":");



if(statethree == HIGH){ // When switch is pressed it will read HIGH
    
    hour++; // LEFT BUTTON - add a hour

    
    lcd.setCursor(0,0);
    lcd.print("Adjust Hour      ");
}
    else if(state == HIGH){ // When switch is pressed it will read HIGH
    
      minute++; //MIDDLE BUTTON - add a minute

      
      lcd.setCursor(0,0);
      lcd.print("Adjust Minute   ");
    }

    
  else if (statetwo == HIGH){ // When switch is pressed it will read HIGH
    
    lcd.setCursor(0,0);
    lcd.print("[HOUR][MIN] INFO"); //RIGHT BUTTON - show info 
  }


if (seconds >= 60){
  seconds = 0;
  minute = minute + 1;  // count up to a minute
  

  
if (minute >= 60){
minute=0;
hour = hour + 1; // count up to a hour 


 
if (hour == 13){ // clock does not pass 12, after 12, the next number should be 1
hour = 1;


}
}
}
}

Credits

jackycppp

jackycppp

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