Door Alarm Sensor (Wired)

Protect your home with a simple magnetic sensor and alarm with an arduino uno.

Jun 18, 2020

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2 respects

security

Components and supplies

Resistor 330 ohm

Jumper wires (generic)

Arduino UNO

Breadboard (generic)

Resistor 10k ohm

5 mm LED: Red

Buzzer, Piezo

5 mm LED: Yellow

Reed Switch, Magnet Switch Set

Tools and machines

Solder Wire, Lead Free

Soldering iron (generic)

Project description

Code

Door Alarm Sensor Code

arduino

1int buzzer = 9; 
2int red = 13;
3int yellow = 12;
4int yellowState  = LOW;
5int REED = 3;
6int redState = HIGH;
7int proximity = LOW;
8int proximityprevious  = LOW;
9
10
11void setup(){
12  pinMode(yellow,OUTPUT);
13  pinMode(buzzer,  OUTPUT); 
14  pinMode(red, OUTPUT);
15  pinMode(REED, INPUT_PULLUP);
16      
17  if (yellowState == LOW)       
18  tone(buzzer,2500);
19  delay(900);
20  noTone(buzzer);
21  }
22 
23
24
25void loop(){
26
27proximity = digitalRead(REED); 
28
29if  (proximityprevious == HIGH)
30{
31  proximity = HIGH;
32}
33
34
35
36
37  
38    if (proximity == HIGH)
39      
40             
41   {
42              proximityprevious  = HIGH;     
43              yellowState = LOW;             
44             digitalWrite(red,  HIGH);
45             delay(45);
46             digitalWrite(red, LOW);
47             delay(5);  
48             tone(buzzer, 3000); 
49             delay(200);        
50             noTone(buzzer);     
51             delay(100);       
52}
53            
54    else
55             {
56              yellowState = HIGH;
57             redState = LOW;
58             }
59                
60                
61           
62   
63
64     
65{
66digitalWrite(red,redState);
67digitalWrite(yellow,yellowState);
68
69  
70
71}
72}
73             
74
75

int buzzer = 9; 
int red = 13;
int yellow = 12;
int yellowState  = LOW;
int REED = 3;
int redState = HIGH;
int proximity = LOW;
int proximityprevious  = LOW;


void setup(){
  pinMode(yellow,OUTPUT);
  pinMode(buzzer,  OUTPUT); 
  pinMode(red, OUTPUT);
  pinMode(REED, INPUT_PULLUP);
      
  if (yellowState == LOW)       
  tone(buzzer,2500);
  delay(900);
  noTone(buzzer);
  }
 


void loop(){

proximity = digitalRead(REED); 

if  (proximityprevious == HIGH)
{
  proximity = HIGH;
}




  
    if (proximity == HIGH)
      
             
   {
              proximityprevious  = HIGH;     
              yellowState = LOW;             
             digitalWrite(red,  HIGH);
             delay(45);
             digitalWrite(red, LOW);
             delay(5);  
             tone(buzzer, 3000); 
             delay(200);        
             noTone(buzzer);     
             delay(100);       
}
            
    else
             {
              yellowState = HIGH;
             redState = LOW;
             }
                
                
           
   

     
{
digitalWrite(red,redState);
digitalWrite(yellow,yellowState);

  

}
}

Door Alarm Sensor Code

arduino

1int buzzer = 9; 
2int red = 13;
3int yellow = 12;
4int yellowState   = LOW;
5int REED = 3;
6int redState = HIGH;
7int proximity = LOW;
8int proximityprevious   = LOW;
9
10
11void setup(){
12  pinMode(yellow,OUTPUT);
13  pinMode(buzzer,   OUTPUT); 
14  pinMode(red, OUTPUT);
15  pinMode(REED, INPUT_PULLUP);
16      
17   if (yellowState == LOW)       
18  tone(buzzer,2500);
19  delay(900);
20  noTone(buzzer);
21   }
22 
23
24
25void loop(){
26
27proximity = digitalRead(REED); 
28
29if   (proximityprevious == HIGH)
30{
31  proximity = HIGH;
32}
33
34
35
36
37   
38    if (proximity == HIGH)
39      
40             
41   {
42              proximityprevious   = HIGH;     
43              yellowState = LOW;             
44             digitalWrite(red,   HIGH);
45             delay(45);
46             digitalWrite(red, LOW);
47             delay(5);   
48             tone(buzzer, 3000); 
49             delay(200);        
50             noTone(buzzer);      
51             delay(100);       
52}
53            
54    else
55             {
56               yellowState = HIGH;
57             redState = LOW;
58             }
59                 
60                
61           
62   
63
64     
65{
66digitalWrite(red,redState);
67digitalWrite(yellow,yellowState);
68
69   
70
71}
72}
73             
74
75

int buzzer = 9; 
int red = 13;
int yellow = 12;
int yellowState   = LOW;
int REED = 3;
int redState = HIGH;
int proximity = LOW;
int proximityprevious   = LOW;


void setup(){
  pinMode(yellow,OUTPUT);
  pinMode(buzzer,   OUTPUT); 
  pinMode(red, OUTPUT);
  pinMode(REED, INPUT_PULLUP);
      
   if (yellowState == LOW)       
  tone(buzzer,2500);
  delay(900);
  noTone(buzzer);
   }
 


void loop(){

proximity = digitalRead(REED); 

if   (proximityprevious == HIGH)
{
  proximity = HIGH;
}




   
    if (proximity == HIGH)
      
             
   {
              proximityprevious   = HIGH;     
              yellowState = LOW;             
             digitalWrite(red,   HIGH);
             delay(45);
             digitalWrite(red, LOW);
             delay(5);   
             tone(buzzer, 3000); 
             delay(200);        
             noTone(buzzer);      
             delay(100);       
}
            
    else
             {
               yellowState = HIGH;
             redState = LOW;
             }
                 
                
           
   

     
{
digitalWrite(red,redState);
digitalWrite(yellow,yellowState);

   

}
}

Downloadable files

Door Alarm Sensor Setup

The yellow LED remains on all the time. The red LED blinks and the buzzer sounds when the door is opened/ alarm is triggered. The alarm does not stop until you press the reset button on the arduino or disconnect from power. I used a Wemo plug to set the time that I want the alarm to be on and to have easier access to an OFF switch in case the alarm sounds.

Door Alarm Sensor Setup

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