Hello Digital Timer

Hello Digital Timer for turning any device on for a set duration.

Dec 27, 2020

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254 views

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2 respects

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Components and supplies

Solid State Relay

Arduino UNO

Slide Switch

Resistor 220 ohm

LED Light Bulb, Cool White

Buzzer

Jumper wires (generic)

Breadboard (generic)

Rotary potentiometer (generic)

DC Motor, Miniature

Alphanumeric LCD, 16 x 2

Apps and platforms

tinkercad

Arduino IDE

Project description

Code

Untitled file

c_cpp

1#include <LiquidCrystal.h>
2LiquidCrystal lcd1(13, 12, 11, 10, 9, 8);
3LiquidCrystal   lcd2(7, 6, 5, 4, 3, 2);
4int push_button = A0; // select the input pin for switch
5int   minutes;
6int seconds;
7int updated_minutes;
8int updated_seconds;
9int   button = 0; // variable to store the value coming from the sensor
10int timer_time;
11int   duration;
12void setup()
13{
14Serial.begin(9600);  
15lcd1.begin(16, 2);
16lcd2.begin(16,   2);
17pinMode(A3, OUTPUT);
18pinMode(A4, OUTPUT);  
19pinMode(push_button, INPUT);
20pinMode(A1,   INPUT); 
21pinMode(A2, INPUT);  
22}
23
24void loop()
25{ 
26digitalWrite(A3,LOW);
27digitalWrite(A4,LOW);   
28button = digitalRead(push_button);
29timer_time = analogRead(A1); 
30timer_time   = timer_time/20;  
31duration = analogRead(A2);
32duration = duration/20;  
33Serial.print("Timer   time = ");
34Serial.println(timer_time); 
35Serial.print("Duration = ");
36Serial.println(duration);   
37lcd2.setCursor(0,0);
38lcd2.print("Timer Time ");
39lcd2.setCursor(13,0);
40lcd2.print(timer_time);   
41lcd2.setCursor(0,1);
42lcd2.print("Duration ");
43lcd2.setCursor(13,1);
44lcd2.print(duration);   
45delay(400);
46lcd2.clear();  
47  if(button == HIGH )
48  {
49    digitalWrite(A4,   HIGH); 
50  for(minutes=0;minutes<timer_time;minutes++)
51  {
52    lcd1.setCursor(0,0);
53     lcd1.print("My Timer:-   ");
54    lcd1.setCursor(11,0);
55    lcd1.print(minutes);
56     lcd1.print(":");
57    for(seconds=0;seconds<=59;seconds++)
58    {
59     lcd1.setCursor(13,0);
60    lcd1.print(seconds);
61    delay(1000);
62    
63     }
64    lcd1.setCursor(11,0);
65    updated_minutes = minutes+1;
66    lcd1.print(   updated_minutes);
67    lcd1.print(":");
68    updated_seconds = seconds-59;
69     lcd1.setCursor(13,0);
70    lcd1.print(updated_seconds);
71   digitalWrite(A3,   LOW); 
72   digitalWrite(A4, HIGH);
73   lcd1.clear();
74  }
75  for(seconds=duration;seconds>=0;seconds=seconds-1)
76   {
77    lcd1.setCursor(0,0);
78    lcd1.print("Duration:    ");
79
80   lcd1.setCursor(11,0);
81    lcd1.print(seconds);
82    digitalWrite(A3, HIGH);
83    digitalWrite(A4, LOW);
84   
85   delay(1000);
86     
87  }
88}
89else 
90{
91digitalWrite(A3, LOW);   
92}
93}

#include <LiquidCrystal.h>
LiquidCrystal lcd1(13, 12, 11, 10, 9, 8);
LiquidCrystal   lcd2(7, 6, 5, 4, 3, 2);
int push_button = A0; // select the input pin for switch
int   minutes;
int seconds;
int updated_minutes;
int updated_seconds;
int   button = 0; // variable to store the value coming from the sensor
int timer_time;
int   duration;
void setup()
{
Serial.begin(9600);  
lcd1.begin(16, 2);
lcd2.begin(16,   2);
pinMode(A3, OUTPUT);
pinMode(A4, OUTPUT);  
pinMode(push_button, INPUT);
pinMode(A1,   INPUT); 
pinMode(A2, INPUT);  
}

void loop()
{ 
digitalWrite(A3,LOW);
digitalWrite(A4,LOW);   
button = digitalRead(push_button);
timer_time = analogRead(A1); 
timer_time   = timer_time/20;  
duration = analogRead(A2);
duration = duration/20;  
Serial.print("Timer   time = ");
Serial.println(timer_time); 
Serial.print("Duration = ");
Serial.println(duration);   
lcd2.setCursor(0,0);
lcd2.print("Timer Time ");
lcd2.setCursor(13,0);
lcd2.print(timer_time);   
lcd2.setCursor(0,1);
lcd2.print("Duration ");
lcd2.setCursor(13,1);
lcd2.print(duration);   
delay(400);
lcd2.clear();  
  if(button == HIGH )
  {
    digitalWrite(A4,   HIGH); 
  for(minutes=0;minutes<timer_time;minutes++)
  {
    lcd1.setCursor(0,0);
     lcd1.print("My Timer:-   ");
    lcd1.setCursor(11,0);
    lcd1.print(minutes);
     lcd1.print(":");
    for(seconds=0;seconds<=59;seconds++)
    {
     lcd1.setCursor(13,0);
    lcd1.print(seconds);
    delay(1000);
    
     }
    lcd1.setCursor(11,0);
    updated_minutes = minutes+1;
    lcd1.print(   updated_minutes);
    lcd1.print(":");
    updated_seconds = seconds-59;
     lcd1.setCursor(13,0);
    lcd1.print(updated_seconds);
   digitalWrite(A3,   LOW); 
   digitalWrite(A4, HIGH);
   lcd1.clear();
  }
  for(seconds=duration;seconds>=0;seconds=seconds-1)
   {
    lcd1.setCursor(0,0);
    lcd1.print("Duration:    ");

   lcd1.setCursor(11,0);
    lcd1.print(seconds);
    digitalWrite(A3, HIGH);
    digitalWrite(A4, LOW);
   
   delay(1000);
     
  }
}
else 
{
digitalWrite(A3, LOW);   
}
}

Untitled file

c_cpp

1#include <LiquidCrystal.h>
2LiquidCrystal lcd1(13, 12, 11, 10, 9, 8);
3LiquidCrystal  lcd2(7, 6, 5, 4, 3, 2);
4int push_button = A0; // select the input pin for switch
5int  minutes;
6int seconds;
7int updated_minutes;
8int updated_seconds;
9int  button = 0; // variable to store the value coming from the sensor
10int timer_time;
11int  duration;
12void setup()
13{
14Serial.begin(9600);  
15lcd1.begin(16, 2);
16lcd2.begin(16,  2);
17pinMode(A3, OUTPUT);
18pinMode(A4, OUTPUT);  
19pinMode(push_button, INPUT);
20pinMode(A1,  INPUT); 
21pinMode(A2, INPUT);  
22}
23
24void loop()
25{ 
26digitalWrite(A3,LOW);
27digitalWrite(A4,LOW);  
28button = digitalRead(push_button);
29timer_time = analogRead(A1); 
30timer_time  = timer_time/20;  
31duration = analogRead(A2);
32duration = duration/20;  
33Serial.print("Timer  time = ");
34Serial.println(timer_time); 
35Serial.print("Duration = ");
36Serial.println(duration);  
37lcd2.setCursor(0,0);
38lcd2.print("Timer Time ");
39lcd2.setCursor(13,0);
40lcd2.print(timer_time);  
41lcd2.setCursor(0,1);
42lcd2.print("Duration ");
43lcd2.setCursor(13,1);
44lcd2.print(duration);  
45delay(400);
46lcd2.clear();  
47  if(button == HIGH )
48  {
49    digitalWrite(A4,  HIGH); 
50  for(minutes=0;minutes<timer_time;minutes++)
51  {
52    lcd1.setCursor(0,0);
53    lcd1.print("My Timer:-   ");
54    lcd1.setCursor(11,0);
55    lcd1.print(minutes);
56    lcd1.print(":");
57    for(seconds=0;seconds<=59;seconds++)
58    {
59    lcd1.setCursor(13,0);
60    lcd1.print(seconds);
61    delay(1000);
62    
63    }
64    lcd1.setCursor(11,0);
65    updated_minutes = minutes+1;
66    lcd1.print(  updated_minutes);
67    lcd1.print(":");
68    updated_seconds = seconds-59;
69    lcd1.setCursor(13,0);
70    lcd1.print(updated_seconds);
71   digitalWrite(A3,  LOW); 
72   digitalWrite(A4, HIGH);
73   lcd1.clear();
74  }
75  for(seconds=duration;seconds>=0;seconds=seconds-1)
76  {
77    lcd1.setCursor(0,0);
78    lcd1.print("Duration:    ");
79
80   lcd1.setCursor(11,0);
81   lcd1.print(seconds);
82    digitalWrite(A3, HIGH);
83    digitalWrite(A4, LOW);
84  
85   delay(1000);
86     
87  }
88}
89else 
90{
91digitalWrite(A3, LOW);  
92}
93}

#include <LiquidCrystal.h>
LiquidCrystal lcd1(13, 12, 11, 10, 9, 8);
LiquidCrystal  lcd2(7, 6, 5, 4, 3, 2);
int push_button = A0; // select the input pin for switch
int  minutes;
int seconds;
int updated_minutes;
int updated_seconds;
int  button = 0; // variable to store the value coming from the sensor
int timer_time;
int  duration;
void setup()
{
Serial.begin(9600);  
lcd1.begin(16, 2);
lcd2.begin(16,  2);
pinMode(A3, OUTPUT);
pinMode(A4, OUTPUT);  
pinMode(push_button, INPUT);
pinMode(A1,  INPUT); 
pinMode(A2, INPUT);  
}

void loop()
{ 
digitalWrite(A3,LOW);
digitalWrite(A4,LOW);  
button = digitalRead(push_button);
timer_time = analogRead(A1); 
timer_time  = timer_time/20;  
duration = analogRead(A2);
duration = duration/20;  
Serial.print("Timer  time = ");
Serial.println(timer_time); 
Serial.print("Duration = ");
Serial.println(duration);  
lcd2.setCursor(0,0);
lcd2.print("Timer Time ");
lcd2.setCursor(13,0);
lcd2.print(timer_time);  
lcd2.setCursor(0,1);
lcd2.print("Duration ");
lcd2.setCursor(13,1);
lcd2.print(duration);  
delay(400);
lcd2.clear();  
  if(button == HIGH )
  {
    digitalWrite(A4,  HIGH); 
  for(minutes=0;minutes<timer_time;minutes++)
  {
    lcd1.setCursor(0,0);
    lcd1.print("My Timer:-   ");
    lcd1.setCursor(11,0);
    lcd1.print(minutes);
    lcd1.print(":");
    for(seconds=0;seconds<=59;seconds++)
    {
    lcd1.setCursor(13,0);
    lcd1.print(seconds);
    delay(1000);
    
    }
    lcd1.setCursor(11,0);
    updated_minutes = minutes+1;
    lcd1.print(  updated_minutes);
    lcd1.print(":");
    updated_seconds = seconds-59;
    lcd1.setCursor(13,0);
    lcd1.print(updated_seconds);
   digitalWrite(A3,  LOW); 
   digitalWrite(A4, HIGH);
   lcd1.clear();
  }
  for(seconds=duration;seconds>=0;seconds=seconds-1)
  {
    lcd1.setCursor(0,0);
    lcd1.print("Duration:    ");

   lcd1.setCursor(11,0);
   lcd1.print(seconds);
    digitalWrite(A3, HIGH);
    digitalWrite(A4, LOW);
  
   delay(1000);
     
  }
}
else 
{
digitalWrite(A3, LOW);  
}
}

Downloadable files

When the duration time is on.

When the timer is on

Initial state of the project

When the duration time is on.

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