Labs | Analog Tone & Servo Control

Tone Output Using Arduino

My photoresistors broke because of my spectacular soldering work. I've ordered replacements.

In the meanwhile I followed through on the lab but my photoresistors broke so I ended up using buttons to implement the same feature.

I increased the threshold to 20 otherwise there was random noise coming in.

Concern: For some reason the sound in the speaker comes out very low. Im curious about what the cause behind it is

#include "pitches.h"
 
const int threshold = 20;      // minimum reading of the sensors that generates a note
const int speakerPin = 8;      // pin number for the speaker
const int noteDuration = 20;   // play notes for 20 ms
 
// notes to play, corresponding to the 3 sensors:
int notes[] = {
NOTE_A4, NOTE_B4,NOTE_C3 };
 
void setup() {
 
}
 
void loop() {
  for (int thisSensor = 0; thisSensor < 2; thisSensor++) {
    // get a sensor reading:
    int sensorReading = analogRead(thisSensor) ;
   
 
    // if the sensor is pressed hard enough:
    if (sensorReading > threshold) {
      // play the note corresponding to this sensor:
      tone(speakerPin, notes[thisSensor], noteDuration);
    }
  }
}

Servo Motor Control

I was also able to get the servo motor working properly.

#include "pitches.h"
#include "Servo.h"


Servo servoMotor;
int servoPin = 2;
const int speakerPin = 8;      // pin number for the speaker

const int threshold = 30;      // minimum reading of the sensors that generates a note
const int noteDuration = 20;   // play notes for 20 ms

// notes to play, corresponding to the 3 sensors:
int notes[] = {
  NOTE_A4, NOTE_B4, NOTE_C3
};

void setup() {
  Serial.begin(9600);       // initialize serial communications
  servoMotor.attach(servoPin);
}

int changing = 0;

void loop() {
  int total = 0;

  for (int thisSensor = 0; thisSensor < 2; thisSensor++) {
    //    // get a sensor reading:
    int sensorReading = analogRead(thisSensor) ;
    total = total + sensorReading;
  }

  // Control servo
  int servoAngle = map(total, 0, 2047, 0, 90);

  if (millis() % 500 < 2) {
    // Log
    Serial.print(total);
    Serial.print("| ");
    Serial.print(servoAngle);
    Serial.println();
  }

  if (millis() % 20 < 2) {
    //    servoMotor.write(servoAngle);
    servoMotor.write(changing);
  }

  if (millis() % 10 < 2) {
//    changing = (changing + 20) % 180;
    changing = servoAngle;
  }
}