Electronic Ultrasonic Emitter (Project E.U.E) - Basic Version

electronic_ultrasonic_emitter_basic.ino

/**
 * Electronic Ultrasonic Emitter (Project E.U.E) - Basic Version
 * by Waren Gonzaga
 * Version: 1.0.6
 * 
 * A simple project that emits ultrasonic waves and possible to repel mosquiotoes.
 * Check this project on Instructables.com
 * Link: https://www.instructables.com/id/Electronic-Ultrasonic-Emitter-Basic-Version/
 * 
 * Contribute to improve this project on gist!
 * Link: https://gist.github.com/WarenGonzaga/a51d4402fcc9e995672340b8c3d97312/
 * 
 * This project is made possible by the following.
 * Hive Electronics
 * Connected Cities
 * 
 * Having Trouble?
 * Please email me here: warengonzaga.dev@gmail.com
 * or Just send a quick message to my facebook page.
 * Link: https://facebook.com/warengonzagaofficialpage
 * Follow me on twitter: @waren_gonzaga
 * Visit my website: https://warengonzaga.com/
 * 
 * Licensed under Creative Commons BY-NC-SA
 * Copyright © 2017 Waren Gonzaga
 */

// Speakers
int speaker = 11; // Digital Pin 11

// Lights
int led_blue  = 2; // Digital Pin 2
int led_green = 3; // Digital Pin 3
int led_red   = 4; // Digital Pin 4

// Frequency
int frequency = 40000; // 40KHz (adjust it between 20KHz to 65KHz)

//Are you using RGB?
int withRGB = 1; // 1 = true and 0 = false;

void setup(){
  // Setting Up the Outputs
  pinMode(speaker, OUTPUT);
  pinMode(led_blue, OUTPUT);
  pinMode(led_green, OUTPUT);
  pinMode(led_red, OUTPUT);

  // initializing (light indicator)
  if (withRGB == 1) {
     initTesting(); 
  } else {
     speakerTest();
  }
}

void loop(){
  // dragonfly frequency
  tone(speaker, frequency);
  
  if (withRGB == 1) {
     blinkyIndicator(); 
  }
}

void speakerTest() {
  // testing speaker sound
  tone(speaker, 600);
  delay(1000);
  // last testing of speaker
  tone(speaker, 700);
}

void initTesting() {
  digitalWrite(led_blue, HIGH);
  delay(100);
  digitalWrite(led_blue, LOW);
  delay(100);
  digitalWrite(led_green, HIGH);
  delay(100);
  digitalWrite(led_green, LOW);
  delay(100);
  digitalWrite(led_red, HIGH);
  delay(100);
  digitalWrite(led_red, LOW);
  delay(500);
  digitalWrite(led_blue, HIGH);
  delay(2000);
  // testing speaker sound
  tone(speaker, 600);
  digitalWrite(led_blue, LOW);
  delay(1000);
  digitalWrite(led_green, HIGH);
  delay(2000);
  // last testing of speaker
  tone(speaker, 700);
  digitalWrite(led_green, LOW);
  delay(50);
  digitalWrite(led_green, HIGH);
  delay(50);
  digitalWrite(led_green, LOW);
  delay(50);
  digitalWrite(led_green, HIGH);
  delay(50);
  digitalWrite(led_green, LOW);
}

// optional, delete this if you are not using RGB
void blinkyIndicator() {
  // light indicators 
  digitalWrite(led_blue, HIGH);
  delay(100);
  digitalWrite(led_blue, LOW);
  delay(1000);
  digitalWrite(led_green, HIGH);
  delay(50);
  digitalWrite(led_green, LOW);
  delay(20);
  digitalWrite(led_green, HIGH);
  delay(50);
  digitalWrite(led_green, LOW);
  delay(1000);
  digitalWrite(led_red, HIGH);
  delay(50);
  digitalWrite(led_red, LOW);
  delay(5000);
}

If you take this emmitter and make two. Input into each emitter your voice at two ultrasonic frequencies that are say 4khz apart. You will be able to talk to someone in a zone where the two emmitters cross. This will be a great haloween trick. A sound someone can only hear at a specific spot in front of your house.