This is a didactic project for to learn how to connect an Ultrasonic Sensor to an Arduino UNO.
COMPONENTS REQUIRED
| COMPONENTS | PRICE |
|---|---|
| Arduino UNO clone (Aliexpress) | $ 2.40 |
| Ultrasonic Sensor (Aliexpress) | $ 0.75 |
| 2 Buttons (Aliexpress) | $ 0.64 ($ 0,32 x 2) |
| Plastic box for cheese 🙂 | Free |
CONNECTIONS
| ULTRASONIC SENSOR | ARDUINO |
| VCC | 5V |
| TRIG | D5 |
| ECHO | D6 |
| GND | GND |
| BUTTON 1 | |
| PIN1 | 5V |
| PIN2 | - GND (resistor 10K ohm) - D12 (see the picture) |
| BUTTON 2 | |
| PIN1 | 5V |
| PIN2 | - GND (resistor 10K ohm) - D13 (see the picture) |
In this schematic I drawn a connection to an external speaker but, if you prefere, you can connect the PIN 8 to a Panel Mount Jack (if you wish connect a earphones).
SOFTWARE (SKETCH)
To upload the software for the Poor Man’s Theremin you have to download and install the free ARDUINO IDE clicking here.
The Ultrasonic sensor sends very short pulses of ultrasound to measure the distance to an object. The distance is calculated in CM e converted in tones: distance = 0.034 * duration / 2;
I created an array to convert the CM in tones:Â tone(PIN8, tones[distance ]);
Copy and paste this code in a new arduino sketch!
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// The POOR MAN's THEREMIN // wwww.bleepbit.com // (C) 2018 const int triggerPort = 5; const int echoPort = 6; int noteoff = 1; long duration = 1000; int distance = 1; int distance2 = 1; int tones[] = {66, 70, 74, 78, 83, 88, 93, 98, 104, 110, 117, 124, 131, 139, 147, 156, 165, 175, 185, 196, 208, 220, 233, 247, 262, 277, 294, 311, 330, 349, 370, 392, 415, 440, 466, 494, 523, 554, 587, 622, 659, 698, 740, 784, 831, 880, 932, 988, 1046, 1109, 1175, 1245, 1319, 1397, 1480, 1568, 1661, 1760, 1865, 1976 }; int type=1; int button1 = LOW; int button2 = LOW; void setup() { pinMode(triggerPort, OUTPUT); pinMode(echoPort, INPUT); } void loop() { button1 = digitalRead(12); button2 = digitalRead(13); digitalWrite( triggerPort, LOW ); digitalWrite( triggerPort, HIGH ); delayMicroseconds( 10 ); digitalWrite( triggerPort, LOW ); long duration = pulseIn( echoPort, HIGH ); distance = 0.034 * duration / 2; // BUTTON2 CHANGE EFFECT if (button2 == 1) { type = type + 1; // IF YOU ADD EFFECT INCREASE THE TYPE IN THE NEXT ROW if (type==5) { type = 1; } noTone(8); tone(8,1660); delay(150); noTone(8); delay(100); } // BUTTON1: WHEN PRESSED THE SOUND IS ON if (button1 == 1) { // Distance test if (distance < 41) { distance = distance; } else { distance = noteoff; } // TYPE 1 if (type==1) { for (int k=tones[distance]; k<(tones[distance]+(tones[distance]/5));k=k+1) { tone(8,k); delay(2); } noteoff = distance; } // TYPE 2 if (type==2) { distance2 = distance + 12; for (int k=tones[distance2]+300; k>tones[distance2];k=k-4) { tone(8,k); delay(2); } noteoff = distance; } // TYPE 3 if (type==3) { distance2 = distance + 12; tone(8,tones[distance2]); delay(5); tone(8,tones[distance2] * 5); delay(5); noteoff = distance; } // TYPE 4 if (type==4) { distance2 = (distance); tone(8,tones[distance2]); delay(50); tone(8,tones[distance2+12]); delay(50); noteoff = distance; } // ADD OTHER TYPES delay(10); } else { noTone(8); } } |
Enjoy it!
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