Musical Door Lock

Instead of using a keypad to open your front door or even your safe, why not control the mechanism by a slider that glides through pitches?

Nov 30, 2020

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7 respects

music

Components and supplies

Buzzer

Resistor 220 ohm

Linear Solenoid, 12 VDC

LED (generic)

Ultrasonic Sensor - HC-SR04 (Generic)

Arduino UNO

Project description

Code

arduino

1const int trigPin = 10;
2const int echoPin = 11;
3const int buzzer   = 12;
4const int lock = 4;
5const int led = 13;
6
7float duration, distance,   note, number;
8
9
10void setup() 
11{
12  pinMode(trigPin, OUTPUT);
13  pinMode(echoPin,   INPUT);
14  pinMode(buzzer, OUTPUT); // Set buzzer - pin 12 as an output
15  pinMode(lock,   OUTPUT);
16  pinMode(led, OUTPUT);
17  Serial.begin(9600);
18}
19
20void loop()   
21{
22  digitalWrite(trigPin, LOW);
23  delayMicroseconds(2);
24  digitalWrite(trigPin,   HIGH);
25  delayMicroseconds(10);
26  digitalWrite(trigPin, LOW);
27
28  duration   = pulseIn(echoPin, HIGH);
29  number = (duration*.0343)/2;
30  distance = round(number);
31   delay(100);
32  Serial.print("Distance: ");
33  Serial.println(distance);
34
35   if(distance < 3)
36  {
37    delay(1000);
38    Serial.print("START");
39     Sequence();
40    
41  } 
42}
43
44
45void Sequence()
46  {  
47    digitalWrite(lock,   LOW);
48    digitalWrite(led, LOW);
49    delay(2000);
50    if(distance < 5)
51     {
52      delay(1000);
53      tone(buzzer, 262);
54      Serial.print("C");
55       delay(2000);
56      digitalWrite(trigPin, LOW);
57      delayMicroseconds(2);
58       digitalWrite(trigPin, HIGH);
59      delayMicroseconds(10);
60      digitalWrite(trigPin,   LOW);
61
62      duration = pulseIn(echoPin, HIGH);
63      number = (duration*.0343)/2;
64       distance = round(number);
65      delay(100);
66      Serial.print("Distance:   ");
67      Serial.println(distance);
68      
69      if(distance == 5)
70       {
71        delay(1000);
72        tone(buzzer, 294);
73        Serial.print("D");
74         delay(2000);
75        digitalWrite(trigPin, LOW);
76        delayMicroseconds(2);
77         digitalWrite(trigPin, HIGH);
78        delayMicroseconds(10);
79        digitalWrite(trigPin,   LOW);
80  
81        duration = pulseIn(echoPin, HIGH);
82        number = (duration*.0343)/2;
83         distance = round(number);
84        delay(100);
85        Serial.print("Distance:   ");
86        Serial.println(distance);       
87        
88        if(distance   >= 6)
89        {
90        delay(1000);     
91        tone(buzzer, 330);
92         Serial.print("It Worked");
93        digitalWrite(lock, HIGH);
94        digitalWrite(led,   HIGH);
95        delay(1000);
96        noTone(buzzer);
97         }
98
99          else if(distance < 6)
100        {
101        Serial.print("Didn't work   2");
102        tone(buzzer, 262);
103        delay(500);
104        noTone(buzzer);
105         delay(500);
106        tone(buzzer, 262);
107        delay(500);
108        noTone(buzzer);
109         delay(500);
110        tone(buzzer, 262);
111        delay(500);
112        noTone(buzzer);
113       }
114      }
115      else if((distance < 5) || (distance >6))
116      {
117         Serial.print("Didn't work 1");
118        tone(buzzer, 262);
119        delay(500);
120         noTone(buzzer);
121        delay(500);
122        tone(buzzer, 262);
123         delay(500);
124        noTone(buzzer);
125        delay(500);
126        tone(buzzer,   262);
127        delay(500);
128        noTone(buzzer);
129      }
130    }
131     
132    else
133    {
134      Serial.print("Restart");
135    }
136  }

const int trigPin = 10;
const int echoPin = 11;
const int buzzer   = 12;
const int lock = 4;
const int led = 13;

float duration, distance,   note, number;


void setup() 
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin,   INPUT);
  pinMode(buzzer, OUTPUT); // Set buzzer - pin 12 as an output
  pinMode(lock,   OUTPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop()   
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin,   HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration   = pulseIn(echoPin, HIGH);
  number = (duration*.0343)/2;
  distance = round(number);
   delay(100);
  Serial.print("Distance: ");
  Serial.println(distance);

   if(distance < 3)
  {
    delay(1000);
    Serial.print("START");
     Sequence();
    
  } 
}


void Sequence()
  {  
    digitalWrite(lock,   LOW);
    digitalWrite(led, LOW);
    delay(2000);
    if(distance < 5)
     {
      delay(1000);
      tone(buzzer, 262);
      Serial.print("C");
       delay(2000);
      digitalWrite(trigPin, LOW);
      delayMicroseconds(2);
       digitalWrite(trigPin, HIGH);
      delayMicroseconds(10);
      digitalWrite(trigPin,   LOW);

      duration = pulseIn(echoPin, HIGH);
      number = (duration*.0343)/2;
       distance = round(number);
      delay(100);
      Serial.print("Distance:   ");
      Serial.println(distance);
      
      if(distance == 5)
       {
        delay(1000);
        tone(buzzer, 294);
        Serial.print("D");
         delay(2000);
        digitalWrite(trigPin, LOW);
        delayMicroseconds(2);
         digitalWrite(trigPin, HIGH);
        delayMicroseconds(10);
        digitalWrite(trigPin,   LOW);
  
        duration = pulseIn(echoPin, HIGH);
        number = (duration*.0343)/2;
         distance = round(number);
        delay(100);
        Serial.print("Distance:   ");
        Serial.println(distance);       
        
        if(distance   >= 6)
        {
        delay(1000);     
        tone(buzzer, 330);
         Serial.print("It Worked");
        digitalWrite(lock, HIGH);
        digitalWrite(led,   HIGH);
        delay(1000);
        noTone(buzzer);
         }

          else if(distance < 6)
        {
        Serial.print("Didn't work   2");
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
         delay(500);
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
         delay(500);
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
       }
      }
      else if((distance < 5) || (distance >6))
      {
         Serial.print("Didn't work 1");
        tone(buzzer, 262);
        delay(500);
         noTone(buzzer);
        delay(500);
        tone(buzzer, 262);
         delay(500);
        noTone(buzzer);
        delay(500);
        tone(buzzer,   262);
        delay(500);
        noTone(buzzer);
      }
    }
     
    else
    {
      Serial.print("Restart");
    }
  }

Code

arduino

1const int trigPin = 10;
2const int echoPin = 11;
3const int buzzer  = 12;
4const int lock = 4;
5const int led = 13;
6
7float duration, distance,  note, number;
8
9
10void setup() 
11{
12  pinMode(trigPin, OUTPUT);
13  pinMode(echoPin,  INPUT);
14  pinMode(buzzer, OUTPUT); // Set buzzer - pin 12 as an output
15  pinMode(lock,  OUTPUT);
16  pinMode(led, OUTPUT);
17  Serial.begin(9600);
18}
19
20void loop()  
21{
22  digitalWrite(trigPin, LOW);
23  delayMicroseconds(2);
24  digitalWrite(trigPin,  HIGH);
25  delayMicroseconds(10);
26  digitalWrite(trigPin, LOW);
27
28  duration  = pulseIn(echoPin, HIGH);
29  number = (duration*.0343)/2;
30  distance = round(number);
31  delay(100);
32  Serial.print("Distance: ");
33  Serial.println(distance);
34
35  if(distance < 3)
36  {
37    delay(1000);
38    Serial.print("START");
39    Sequence();
40    
41  } 
42}
43
44
45void Sequence()
46  {  
47    digitalWrite(lock,  LOW);
48    digitalWrite(led, LOW);
49    delay(2000);
50    if(distance < 5)
51    {
52      delay(1000);
53      tone(buzzer, 262);
54      Serial.print("C");
55      delay(2000);
56      digitalWrite(trigPin, LOW);
57      delayMicroseconds(2);
58      digitalWrite(trigPin, HIGH);
59      delayMicroseconds(10);
60      digitalWrite(trigPin,  LOW);
61
62      duration = pulseIn(echoPin, HIGH);
63      number = (duration*.0343)/2;
64      distance = round(number);
65      delay(100);
66      Serial.print("Distance:  ");
67      Serial.println(distance);
68      
69      if(distance == 5)
70      {
71        delay(1000);
72        tone(buzzer, 294);
73        Serial.print("D");
74        delay(2000);
75        digitalWrite(trigPin, LOW);
76        delayMicroseconds(2);
77        digitalWrite(trigPin, HIGH);
78        delayMicroseconds(10);
79        digitalWrite(trigPin,  LOW);
80  
81        duration = pulseIn(echoPin, HIGH);
82        number = (duration*.0343)/2;
83        distance = round(number);
84        delay(100);
85        Serial.print("Distance:  ");
86        Serial.println(distance);       
87        
88        if(distance  >= 6)
89        {
90        delay(1000);     
91        tone(buzzer, 330);
92        Serial.print("It Worked");
93        digitalWrite(lock, HIGH);
94        digitalWrite(led,  HIGH);
95        delay(1000);
96        noTone(buzzer);
97         }
98
99         else if(distance < 6)
100        {
101        Serial.print("Didn't work  2");
102        tone(buzzer, 262);
103        delay(500);
104        noTone(buzzer);
105        delay(500);
106        tone(buzzer, 262);
107        delay(500);
108        noTone(buzzer);
109        delay(500);
110        tone(buzzer, 262);
111        delay(500);
112        noTone(buzzer);
113      }
114      }
115      else if((distance < 5) || (distance >6))
116      {
117        Serial.print("Didn't work 1");
118        tone(buzzer, 262);
119        delay(500);
120        noTone(buzzer);
121        delay(500);
122        tone(buzzer, 262);
123        delay(500);
124        noTone(buzzer);
125        delay(500);
126        tone(buzzer,  262);
127        delay(500);
128        noTone(buzzer);
129      }
130    }
131    
132    else
133    {
134      Serial.print("Restart");
135    }
136  }

const int trigPin = 10;
const int echoPin = 11;
const int buzzer  = 12;
const int lock = 4;
const int led = 13;

float duration, distance,  note, number;


void setup() 
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin,  INPUT);
  pinMode(buzzer, OUTPUT); // Set buzzer - pin 12 as an output
  pinMode(lock,  OUTPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop()  
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin,  HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration  = pulseIn(echoPin, HIGH);
  number = (duration*.0343)/2;
  distance = round(number);
  delay(100);
  Serial.print("Distance: ");
  Serial.println(distance);

  if(distance < 3)
  {
    delay(1000);
    Serial.print("START");
    Sequence();
    
  } 
}


void Sequence()
  {  
    digitalWrite(lock,  LOW);
    digitalWrite(led, LOW);
    delay(2000);
    if(distance < 5)
    {
      delay(1000);
      tone(buzzer, 262);
      Serial.print("C");
      delay(2000);
      digitalWrite(trigPin, LOW);
      delayMicroseconds(2);
      digitalWrite(trigPin, HIGH);
      delayMicroseconds(10);
      digitalWrite(trigPin,  LOW);

      duration = pulseIn(echoPin, HIGH);
      number = (duration*.0343)/2;
      distance = round(number);
      delay(100);
      Serial.print("Distance:  ");
      Serial.println(distance);
      
      if(distance == 5)
      {
        delay(1000);
        tone(buzzer, 294);
        Serial.print("D");
        delay(2000);
        digitalWrite(trigPin, LOW);
        delayMicroseconds(2);
        digitalWrite(trigPin, HIGH);
        delayMicroseconds(10);
        digitalWrite(trigPin,  LOW);
  
        duration = pulseIn(echoPin, HIGH);
        number = (duration*.0343)/2;
        distance = round(number);
        delay(100);
        Serial.print("Distance:  ");
        Serial.println(distance);       
        
        if(distance  >= 6)
        {
        delay(1000);     
        tone(buzzer, 330);
        Serial.print("It Worked");
        digitalWrite(lock, HIGH);
        digitalWrite(led,  HIGH);
        delay(1000);
        noTone(buzzer);
         }

         else if(distance < 6)
        {
        Serial.print("Didn't work  2");
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
        delay(500);
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
        delay(500);
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
      }
      }
      else if((distance < 5) || (distance >6))
      {
        Serial.print("Didn't work 1");
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
        delay(500);
        tone(buzzer, 262);
        delay(500);
        noTone(buzzer);
        delay(500);
        tone(buzzer,  262);
        delay(500);
        noTone(buzzer);
      }
    }
    
    else
    {
      Serial.print("Restart");
    }
  }

Downloadable files

Schematic

Solenoid Schematic

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