This was one of my first Arduino builds back in May 2020. (It makes reference to the coffin dance which felt a little dated back then).
I’ve uploaded this project to tinkercad for easy simulation/access:
Social distancing project (tinkercad.com)
The UARDUINO_UNO_R3_5V is coming from the on-board 5V DCDC converter (not shown in diagram below). The input power (which is not shown, is coming from a 9V battery input to the DC Barrel Jack. This battery was hidden underneath the arduino and was placed into a small pocket sewn into the hat just underneath the arduino. I used a needle and thread to secure the arduino board to the hat though its standoff holes.
Arduino Code found below:
//----------pitches.h file-----------------
#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
//----------END OF pitches.h file-------
//#include "pitches.h"
const int pingPin = 7; // Trigger Pin of Ultrasonic Sensor
const int echoPin = 6; // Echo Pin of Ultrasonic Sensor
const int buzzpin = 3; //passive buzzer pin (should connect to a resistor of over 400ohms)
long microsecondsToInches(long microseconds) {
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds) {
return microseconds / 29 / 2;
}
int melody[] = {
NOTE_AS4, NOTE_AS4, NOTE_AS4, NOTE_AS4,
NOTE_AS4, NOTE_AS4, NOTE_AS4, NOTE_AS4,
NOTE_AS4, NOTE_AS4, NOTE_AS4, NOTE_AS4,
NOTE_AS4, NOTE_AS4, NOTE_AS4, NOTE_AS4,
NOTE_AS4, NOTE_AS4, NOTE_AS4, NOTE_AS4,
NOTE_D5, NOTE_D5, NOTE_D5, NOTE_D5,
NOTE_C5, NOTE_C5, NOTE_C5, NOTE_C5,
NOTE_F5, NOTE_F5, NOTE_F5, NOTE_F5,
NOTE_G5, NOTE_G5, NOTE_G5, NOTE_G5,
NOTE_G5, NOTE_G5, NOTE_G5, NOTE_G5,
NOTE_G5, NOTE_G5, NOTE_G5, NOTE_G5,
NOTE_C5, NOTE_AS4, NOTE_A4, NOTE_F4,
NOTE_G4, 0, NOTE_G4, NOTE_D5,
NOTE_C5, 0, NOTE_AS4, 0,
NOTE_A4, 0, NOTE_A4, NOTE_A4,
NOTE_C5, 0, NOTE_AS4, NOTE_A4,
NOTE_G4,0, NOTE_G4, NOTE_AS5,
NOTE_A5, NOTE_AS5, NOTE_A5, NOTE_AS5,
NOTE_G4,0, NOTE_G4, NOTE_AS5,
NOTE_A5, NOTE_AS5, NOTE_A5, NOTE_AS5,
NOTE_G4, 0, NOTE_G4, NOTE_D5,
NOTE_C5, 0, NOTE_AS4, 0,
NOTE_A4, 0, NOTE_A4, NOTE_A4,
NOTE_C5, 0, NOTE_AS4, NOTE_A4,
NOTE_G4,0, NOTE_G4, NOTE_AS5,
NOTE_A5, NOTE_AS5, NOTE_A5, NOTE_AS5,
NOTE_G4,0, NOTE_G4, NOTE_AS5,
NOTE_A5, NOTE_AS5, NOTE_A5, NOTE_AS5
};
// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
4,4,4,4,
};
void setup() {
Serial.begin(9600); // Starting Serial Terminal
pinMode(buzzpin,OUTPUT);
}
void loop() {
long duration, inches, cm;
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(10);
digitalWrite(pingPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
if( inches >=48) {noTone(buzzpin);}
else if(inches >12){tone(buzzpin,NOTE_AS4);}
else{for (int thisNote = 0; thisNote < 112; thisNote++)
{int noteDuration = 750 / noteDurations[thisNote];
tone(buzzpin, melody[thisNote], noteDuration);
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
noTone(buzzpin);}}
}
//things to fix: there should be a 3 or 4 second delay between samples so if you're passing people the buzzer won't go off, only people stanting next to you.
//There should also be a on/off switch so the user can disable the sensor when they're looking at a wall or grocery store isle. A potentiometer could also be used to adjust volume if it's not already too bulky.
Eli Bartlit 
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