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Sunday, April 29, 2018

Arduino Mosquito Repellent - How you can generate high frequency sounds with Arduino

It's a good practice(and it's a hobby of mine)to see a simple Arduino project that can be easily built from time to time.
Picture of Arduino Mosquito Repeller


Being busy makes us in need to manage our times efficiently to do many things we want to do.

 He is a simple Arduino project that I wanted to share with you.

 When I first started to learn microcontroller I used to blink that LED as a very primitive embedded software project.



I also wanted to make those signals make sense other than just blinking the LED.

 So I used those microcontroller generated signals to drive speakers and buzzers to make sounds with different frequencies.

 One of those reasons to make these projects was to make an electronic Mosquito Repellent.

 As the legend says, high audio frequencies keep Mosquitoes away from you.

 Of course, this turned out to be a hoax and you can try it for yourself. This simply cannot keep pests nor dogs away from you.

 This only represents sound for them.

 I've tried many circuits and Android App that generated high frequencies to repel Mosquitoes with no use.

 However, the project is so easy and can be modified to be used as an Ultrasonic Ranging device.

 I thought of modifying the code to make one piezoelectric transducer act as a transmitter and the other to act as a reciever.

 I have many trnasducers of them so I want to try that project someday.

 Components
Picture of Tools and Components

 Arduino Uno
PCB
Piezoelectric Disk
Header Pins
A breadboard (optional)
Wires
Soldering Iron

Soldering Lead

Connections
The circuit is very simple, one of the piezoelectric disk is connected to digital pin 9 and the other to digital pin 11. The left over terminal of both the disks is connected together and soldered to the ground terminal of the Arduino.


Circuit
Picture of Code

 Code

 


int speaker = 9;
int frequency = 31000;
int speaker2 = 11;
int frequency2 = 31000;



void setup(){
  pinMode(speaker, OUTPUT);
  pinMode(speaker2, OUTPUT);
}



void loop(){
  tone(speaker, frequency, 1000);
  tone(speaker2, frequency2, 1000);
}




Source: Instructables





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Arduino Automatic Self Powered Water Tap - Use Arduino to control your faucet

In this post, we'll see how to make an Arduino controller self powered automatic water tap.
I've thought of this many times ago. How to make a water tap that opens and closes as you put your hand under it?

 This is obvious of course. It needs an infrared transmitter and sensor to track your hands movements and a controller for operation.

 What is the problem then?

 The only problem is the power that supplies the controller and infrared transmitter and sensor.

 Would you make them powered by DC or AC? Would you power them from a battery or from a wall outlet?



In both cases you need to maintain the power source and make sure it is safe and can power the system or otherwise you'll not be able to use the water.

 Here in this instructable, the author has made a brilliant idea.

 He came up with a simple yet efficient idea to power the system.

 He made it self powered. The water tap makes it own power.

 Here the faucet system generates its own power by a small hydro-generator.

 This small generator can power the system and can also store the power inside a battery to use it in all times.

 So you don't need a wall outlet nor you need a battery to keep checking and recharging. The system is self powered.


Picture of Self-Powered Automatic Water Tap

 Here is the hydro generator 
Picture of Bill of Materials

 Components

 1. 3.6V Micro Hydro Generator

 2. Screw thread (G 1/2", female)

 3. Thread seal tape

 4. Arduino Uno

 5. IR Transmitter 

 6. IR Receiver

 7. 56k Resistor

 8. 220 ohm resistor

 9. PCB board

 10. Micro servo motor

 11. Polymer Lithium Ion Battery

 12. 1.25" diameter plastic pipe
13. Some wires


 Code

 
#include 
int value = 0;
int avg_value = 0;
int sensorPin = A5;  //connect ir receiver output to this pin
int buttonPin = 18;  // button pin to A4
boolean buttonState = HIGH; 
boolean tapState = LOW;
int ledPin = 13; //this is for testing purpose
int tapForState = 0;
Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(buttonPin, HIGH);
  //servo motor is connected to Arduino digital pin 3
  myservo.attach(3);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  delay(50);
  if(buttonState==LOW && tapState==LOW){
    digitalWrite(ledPin, HIGH);
    myservo.write(0);
    delay(7000);
    tapState = HIGH;
    tapForState = 1;  // check either tap was on for button press or not
    }
  else if(buttonState==LOW && tapState==HIGH && tapForState==1){
    digitalWrite(ledPin, LOW);
    myservo.write(80);
    delay(100);
    tapState = LOW;
    tapForState = 0;
    }
  // put your main code here, to run repeatedly:
  for(int i=0; i<20 20="" analogread="" avg_value="" check="" data="" delay="" digitalwrite="" high="" i="" if="" ledpin="" myservo.write="" on="" sensor="" sensorpin="" serial.println="" tap="" tapforstate="2;" tapstate="HIGH;" using="" value="" was="">500 && tapForState==2){
    digitalWrite(ledPin, LOW);
    myservo.write(80);
    delay(100);
    tapState = LOW;
    }
    value = 0;   
}
Source: Instructables






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Friday, April 27, 2018

Arduino Mario Theme - How you can make Arduino Play Mario Theme in 5 minutes

This is dedicated to my tribe...


How don't love that Mario Theme? We all love that epic game and like to see over and over.

 Today we can see this fast built circuit that uses Arduino to play Mario Theme.

 You can typically build this circuit in only 5 minutes.

 My tribe know me and realize that I'm short in time. That's why I like fast built projects.
Components



What you need:

 Arduino Uno Board

USB Cable
8 Ohm Speaker

 Arduino IDE (download and setup on your computer)




Connections


​The circuit is very simple.
This circuit uses PWM signals from PIN 3 to generate tones.
Then all you have to do is to connect the speaker to PIN 3 and GND on your Arduino Board.



Circuit



Code

 

  

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

#define melodyPin 3
//Mario main theme melody
int melody[] = {
  NOTE_E7, NOTE_E7, 0, NOTE_E7,
  0, NOTE_C7, NOTE_E7, 0,
  NOTE_G7, 0, 0,  0,
  NOTE_G6, 0, 0, 0,

  NOTE_C7, 0, 0, NOTE_G6,
  0, 0, NOTE_E6, 0,
  0, NOTE_A6, 0, NOTE_B6,
  0, NOTE_AS6, NOTE_A6, 0,

  NOTE_G6, NOTE_E7, NOTE_G7,
  NOTE_A7, 0, NOTE_F7, NOTE_G7,
  0, NOTE_E7, 0, NOTE_C7,
  NOTE_D7, NOTE_B6, 0, 0,

  NOTE_C7, 0, 0, NOTE_G6,
  0, 0, NOTE_E6, 0,
  0, NOTE_A6, 0, NOTE_B6,
  0, NOTE_AS6, NOTE_A6, 0,

  NOTE_G6, NOTE_E7, NOTE_G7,
  NOTE_A7, 0, NOTE_F7, NOTE_G7,
  0, NOTE_E7, 0, NOTE_C7,
  NOTE_D7, NOTE_B6, 0, 0
};
//Mario main them tempo
int tempo[] = {
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,

  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,

  9, 9, 9,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,

  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,

  9, 9, 9,
  12, 12, 12, 12,
  12, 12, 12, 12,
  12, 12, 12, 12,
};
//Underworld melody
int underworld_melody[] = {
  NOTE_C4, NOTE_C5, NOTE_A3, NOTE_A4,
  NOTE_AS3, NOTE_AS4, 0,
  0,
  NOTE_C4, NOTE_C5, NOTE_A3, NOTE_A4,
  NOTE_AS3, NOTE_AS4, 0,
  0,
  NOTE_F3, NOTE_F4, NOTE_D3, NOTE_D4,
  NOTE_DS3, NOTE_DS4, 0,
  0,
  NOTE_F3, NOTE_F4, NOTE_D3, NOTE_D4,
  NOTE_DS3, NOTE_DS4, 0,
  0, NOTE_DS4, NOTE_CS4, NOTE_D4,
  NOTE_CS4, NOTE_DS4,
  NOTE_DS4, NOTE_GS3,
  NOTE_G3, NOTE_CS4,
  NOTE_C4, NOTE_FS4, NOTE_F4, NOTE_E3, NOTE_AS4, NOTE_A4,
  NOTE_GS4, NOTE_DS4, NOTE_B3,
  NOTE_AS3, NOTE_A3, NOTE_GS3,
  0, 0, 0
};
//Underwolrd tempo
int underworld_tempo[] = {
  12, 12, 12, 12,
  12, 12, 6,
  3,
  12, 12, 12, 12,
  12, 12, 6,
  3,
  12, 12, 12, 12,
  12, 12, 6,
  3,
  12, 12, 12, 12,
  12, 12, 6,
  6, 18, 18, 18,
  6, 6,
  6, 6,
  6, 6,
  18, 18, 18, 18, 18, 18,
  10, 10, 10,
  10, 10, 10,
  3, 3, 3
};

void setup(void)
{
  pinMode(3, OUTPUT);//buzzer
  pinMode(13, OUTPUT);//led indicator when singing a note

}
void loop()
{
  //sing the tunes
  sing(1);
  sing(1);
  sing(2);
}
int song = 0;

void sing(int s) {
  // iterate over the notes of the melody:
  song = s;
  if (song == 2) {
    Serial.println(" 'Underworld Theme'");
    int size = sizeof(underworld_melody) / sizeof(int);
    for (int thisNote = 0; thisNote < size; thisNote++) {

      // to calculate the note duration, take one second
      // divided by the note type.
      //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
      int noteDuration = 1000 / underworld_tempo[thisNote];

      buzz(melodyPin, underworld_melody[thisNote], noteDuration);

      // to distinguish the notes, set a minimum time between them.
      // the note's duration + 30% seems to work well:
      int pauseBetweenNotes = noteDuration * 1.30;
      delay(pauseBetweenNotes);

      // stop the tone playing:
      buzz(melodyPin, 0, noteDuration);

    }

  } else {

    Serial.println(" 'Mario Theme'");
    int size = sizeof(melody) / sizeof(int);
    for (int thisNote = 0; thisNote < size; thisNote++) {

      // to calculate the note duration, take one second
      // divided by the note type.
      //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
      int noteDuration = 1000 / tempo[thisNote];

      buzz(melodyPin, melody[thisNote], noteDuration);

      // to distinguish the notes, set a minimum time between them.
      // the note's duration + 30% seems to work well:
      int pauseBetweenNotes = noteDuration * 1.30;
      delay(pauseBetweenNotes);

      // stop the tone playing:
      buzz(melodyPin, 0, noteDuration);

    }
  }
}

void buzz(int targetPin, long frequency, long length) {
  digitalWrite(13, HIGH);
  long delayValue = 1000000 / frequency / 2; // calculate the delay value between transitions
  //// 1 second's worth of microseconds, divided by the frequency, then split in half since
  //// there are two phases to each cycle
  long numCycles = frequency * length / 1000; // calculate the number of cycles for proper timing
  //// multiply frequency, which is really cycles per second, by the number of seconds to
  //// get the total number of cycles to produce
  for (long i = 0; i < numCycles; i++) { // for the calculated length of time...
    digitalWrite(targetPin, HIGH); // write the buzzer pin high to push out the diaphram
    delayMicroseconds(delayValue); // wait for the calculated delay value
    digitalWrite(targetPin, LOW); // write the buzzer pin low to pull back the diaphram
    delayMicroseconds(delayValue); // wait again or the calculated delay value
  }
  digitalWrite(13, LOW);

}

 Now open Arduino IDE and paste this code inside it.

 Compile the code.

 Upload the sketch into your Arduino board.

 Play your favorite Mario Theme and enjoy.











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