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Timer

Do you not know how to manage time. Do you want to time yourself for something but you don't want a phone time. Then this is for you.

Jan 7, 2021

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Components and supplies

Switch Actuator, Head for spring return push-button

Buzzer, Piezo

Breadboard (generic)

Arduino UNO

Alphanumeric LCD, 16 x 2

Project description

Code

c_cpp

You can use it on Arduino IDE for real projects. Or in tinkercad for simulation

1#include <LiquidCrystal.h>
2
3#define TONO_ERROR 600
4#define TIME_INTERVAL  3000
5
6
7LiquidCrystal lcd(7, 8, 9, 10, 11, 12); 
8
9int hours = 0;            
10int  minutes = 0;         
11int seconds = 0;         
12
13
14
15int hourbutton  = 2;             
16int minutebutton = 3;            
17int secondsbutton = 4;             
18int nueva = 0;
19int startbutton = 6;
20int aux;
21int aux2;
22int  aux3;
23int startbuttonstate;
24int buzzer = 5;
25
26
27void setup()
28{
29   lcd.begin(16, 2);          
30 
31   pinMode(hourbutton, INPUT);     
32   pinMode(minutebutton,  INPUT);     
33   pinMode(secondsbutton, INPUT);     
34   pinMode(startbutton,  INPUT); 
35   pinMode(buzzer,OUTPUT);
36  
37
38      lcd.setCursor(0,0);
39       lcd.print("Timer with");
40       lcd.setCursor(1,1);
41       lcd.print("Arduino  + LCD");
42       delay(2500);
43       lcd.clear();
44}
45
46
47void loop()
48{
49aux  = digitalRead(hourbutton);
50aux2 = digitalRead(minutebutton);
51aux3 = digitalRead(secondsbutton);
52startbuttonstate  = digitalRead(startbutton);
53  if(nueva==0) {
54  lcd.setCursor(0,0);
55       lcd.print("Enter  Time");
56       lcd.setCursor(1,1);
57       lcd.print(hours); 
58       lcd.print(":");  
59       lcd.print(minutes); 
60       lcd.print(":"); 
61       lcd.print(seconds);  
62       lcd.print(":"); 
63       delay(200);
64       lcd.clear();
65
66
67       if(aux==HIGH){
68      
69hours=hours+1;
70
71    if(hours>=59){
72
73      hours=0;
74
75    }
76
77       }else{
78
79hours=hours;
80       }
81
82    if(aux2==HIGH){
83
84    minutes=minutes+1;
85    if(minutes>=59){
86
87      minutes=0;
88
89    }
90 
91    }else{
92minutes=minutes;  
93    }
94  if(aux3==HIGH){
95
96    seconds=seconds+1;
97
98    if(seconds>=59){
99
100      seconds=0;
101      
102    }
103  }else{
104
105  seconds=seconds;
106
107  }
108
109  if(startbuttonstate==HIGH){
110
111  nueva=1;
112  
113  }else{
114
115  nueva=0;
116
117    
118  }
119  
120
121
122  
123  } else if(nueva==1){
124
125  lcd.setCursor(0,0);
126       lcd.print("Getting Started");
127       lcd.setCursor(1,1);
128       lcd.print(hours); 
129       lcd.print(":"); 
130       lcd.print(minutes);  
131       lcd.print(":"); 
132       lcd.print(seconds); 
133       lcd.print(":");  
134       delay(200);
135
136
137
138        if(seconds==0){
139          if(minutes!=0){
140            seconds=59;
141          }
142          
143          if(minutes<=0){
144            minutes=0;
145          }else{
146            minutes=minutes-1;
147          }
148        if(minutes==0){
149          if(hours!=0){
150            minutes=59;
151          }
152          
153          if(hours<=0){
154            hours=0;
155          }else{
156            hours=hours-1;
157          }
158
159        if(hours==0){
160          if(minutes==0){
161            if(seconds==0){
162              nueva=2;  
163            }
164          }
165          
166        }
167        
168        }
169        
170        }else{
171        seconds=seconds-1;
172          delay(1000);
173        }
174
175
176       
177          
178}
179
180else if(nueva==2){
181
182            lcd.setCursor(0,0);
183              lcd.print("Time Up");
184
185                digitalWrite(buzzer,HIGH);
186  				tone(buzzer, 2000, 1000);
187    			delay(1000);
188                digitalWrite(buzzer,LOW);
189  				delay(1000);
190
191                  nueva=0;
192
193                  seconds=0;
194                  minutes=0;
195                  hours=0;
196
197
198                  
199}
200
201
202
203
204
205}

#include <LiquidCrystal.h>

#define TONO_ERROR 600
#define TIME_INTERVAL  3000


LiquidCrystal lcd(7, 8, 9, 10, 11, 12); 

int hours = 0;            
int  minutes = 0;         
int seconds = 0;         



int hourbutton  = 2;             
int minutebutton = 3;            
int secondsbutton = 4;             
int nueva = 0;
int startbutton = 6;
int aux;
int aux2;
int  aux3;
int startbuttonstate;
int buzzer = 5;


void setup()
{
   lcd.begin(16, 2);          
 
   pinMode(hourbutton, INPUT);     
   pinMode(minutebutton,  INPUT);     
   pinMode(secondsbutton, INPUT);     
   pinMode(startbutton,  INPUT); 
   pinMode(buzzer,OUTPUT);
  

      lcd.setCursor(0,0);
       lcd.print("Timer with");
       lcd.setCursor(1,1);
       lcd.print("Arduino  + LCD");
       delay(2500);
       lcd.clear();
}


void loop()
{
aux  = digitalRead(hourbutton);
aux2 = digitalRead(minutebutton);
aux3 = digitalRead(secondsbutton);
startbuttonstate  = digitalRead(startbutton);
  if(nueva==0) {
  lcd.setCursor(0,0);
       lcd.print("Enter  Time");
       lcd.setCursor(1,1);
       lcd.print(hours); 
       lcd.print(":");  
       lcd.print(minutes); 
       lcd.print(":"); 
       lcd.print(seconds);  
       lcd.print(":"); 
       delay(200);
       lcd.clear();


       if(aux==HIGH){
      
hours=hours+1;

    if(hours>=59){

      hours=0;

    }

       }else{

hours=hours;
       }

    if(aux2==HIGH){

    minutes=minutes+1;
    if(minutes>=59){

      minutes=0;

    }
 
    }else{
minutes=minutes;  
    }
  if(aux3==HIGH){

    seconds=seconds+1;

    if(seconds>=59){

      seconds=0;
      
    }
  }else{

  seconds=seconds;

  }

  if(startbuttonstate==HIGH){

  nueva=1;
  
  }else{

  nueva=0;

    
  }
  


  
  } else if(nueva==1){

  lcd.setCursor(0,0);
       lcd.print("Getting Started");
       lcd.setCursor(1,1);
       lcd.print(hours); 
       lcd.print(":"); 
       lcd.print(minutes);  
       lcd.print(":"); 
       lcd.print(seconds); 
       lcd.print(":");  
       delay(200);



        if(seconds==0){
          if(minutes!=0){
            seconds=59;
          }
          
          if(minutes<=0){
            minutes=0;
          }else{
            minutes=minutes-1;
          }
        if(minutes==0){
          if(hours!=0){
            minutes=59;
          }
          
          if(hours<=0){
            hours=0;
          }else{
            hours=hours-1;
          }

        if(hours==0){
          if(minutes==0){
            if(seconds==0){
              nueva=2;  
            }
          }
          
        }
        
        }
        
        }else{
        seconds=seconds-1;
          delay(1000);
        }


       
          
}

else if(nueva==2){

            lcd.setCursor(0,0);
              lcd.print("Time Up");

                digitalWrite(buzzer,HIGH);
  				tone(buzzer, 2000, 1000);
    			delay(1000);
                digitalWrite(buzzer,LOW);
  				delay(1000);

                  nueva=0;

                  seconds=0;
                  minutes=0;
                  hours=0;


                  
}





}

Downloadable files

Circuit

Tinkercad Circuit

Circuit

Tinkercad Circuit

Circuit

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