Arduino Challenge for Using Potentiometer to Tune the Piezo

Arduino Starter Kit Project 06 Youtube Video Challenge

In the Arduino tutorial for starter kit (https://www.youtube.com/watch?v=DnD92Q_Kpac), the challenge presented for changing the phototransistor to control the Piezo to potentiometer.

First, the terms for the project explained:

• Potentiometer: It is used to control the voltage or current in a circuit. The potentiometer consists of a resistive track and a sliding contact, which can be moved by rotating a knob or shaft. The two pins are connected to voltage and ground, while the other would connect to analog signal input to Arduino.
• Piezo: A piezo is a device that vibrates when receiving electricity, and would create song wave.

So the challenge would involve adjusting project 5: Mood Cue and project 6: Light Theremin.

// declare
int sensorValue; // hold sensor value
int potLow = 1023; // calibrate low value 
int potHigh = 0; // calibrate high value 
const int ledPin = 13; // LED pin

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);

  // Make the LED pin an output and turn it on
  pinMode(ledPin, OUTPUT); 
  digitalWrite(ledPin, HIGH);

  // calibrate for the first five seconds after program runs
  while (millis() < 5000) {
    sensorValue = analogRead(A0); 
    // record the max sensor value
    if (sensorValue > potHigh) {
      potHigh = sensorValue; 
    }
    // record the min sensor value
    if (sensorValue < potLow) {
      potLow = sensorValue; 
    }
  }
  // turn the LED off, signaling the end of the calibration period
  digitalWrite(ledPin, LOW);
}

void loop() {
  // read analog signal to A0 pin
  sensorValue = analogRead(A0); 
  // map the sensor values to a wide range of pitches 
  int pitch = map(sensorValue, potLow, potHigh, 100, 2000); 

  // play the tone for 20 ms on pin 8
  tone(8, pitch, 20); 

  Serial.print("sensorVal: " + String(sensorValue)); 

  int angle = map(sensorValue, potLow, potHigh, 0, 179);
  Serial.println("Angle: " + String(angle));

  delay(10); 
}

The schematic of the Arduino would be pretty similar to project 06, except for replacing phototransistor with potentiometer. Also, we could put capacitor in-between potentiometer and wires-to-voltage-and-ground for smoothing out the voltage changes.

Thank you for your reading, please leave a comment!

Ref:

1. ARDUINO PROJECT BOOK
2. 05 Starter Kit: Mood Cue (https://www.youtube.com/watch?v=ybG6TLamn_I&t=3s)
3. 06 Starter Kit: Theremin (https://www.youtube.com/watch?v=DnD92Q_Kpac)