Wednesday, April 22, 2020
Arduino Programmable On/Off Timer Switch for Automation
COMPONENTS ARE REQUIRED:-
1 arduino uno
3 switches
4 10k ohm resistor
1 wood box
1 liquid crystal LCD 12*2
1 5v relay
1 silicon diode
1 socket
1 button
.....some jumpers wire
CODE:-
#include <LiquidCrystal.h>
LiquidCrystal lcd(7,6,5,4,3,2);
const int set = 8;
int hours=10;
int start=11;
int relay=9;
long b=0,h=0;
long t=0;
int buttonState = 0;
int lastButtonState = 0;
void setup() {
pinMode(set,INPUT);
pinMode(hours,INPUT);
pinMode(relay,OUTPUT);
pinMode(start,INPUT);
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("Adjustable Timer");
}
int timer( int b,int h)
{
if(b<=9)
{
lcd.setCursor(8,1);
lcd.print(0);
lcd.setCursor(9,1);
lcd.print(b);
}
else{lcd.setCursor(8,1);
lcd.print(b);}
lcd.setCursor(0,1);
lcd.print("=====");
lcd.setCursor(7,1);
lcd.print(":");
lcd.setCursor(10,1);
lcd.print("=====");
if(h<=9)
{
lcd.setCursor(5,1);
lcd.print(0);
lcd.setCursor(6,1);
lcd.print(h);
}
else{lcd.setCursor(5,1);
lcd.print(h);}
}
void loop()
{
buttonState = digitalRead(set);
if (buttonState != lastButtonState)
{
if(buttonState == HIGH)
{
lcd.clear();
lcd.print("Set time in min:");
b++;
timer(b,h);
}
lastButtonState = buttonState;
}
if (digitalRead(hours)== HIGH)
{
lcd.clear();
lcd.print("Set time in hours");
h++;
timer(b,h);
while(digitalRead(hours)==HIGH);
}
if(digitalRead(start)==HIGH)
{
lcd.clear();
t=((h*3600)+(b*60))*1000;
lcd.print("Timer is set for");
timer(b,h);
digitalWrite(relay,HIGH);
delay(t);
digitalWrite(relay,LOW);
while(digitalRead(start) == HIGH );
}
}
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