Lab 2

In this lab, we focused on using the microcontroller to measure both inputs and outputs. First, we determined how to generate a ramp output and a sine wave and displayed them both in StampPlot. Additionally, we learned how to output these functions into the Oscilloscope.


Sine Wave

void setup() {

Serial.begin(9600);

}

float x=0;

void loop()

{

Serial.println(sin(x));

x+=0.1;

delay(10);

}

Square Wave

int period;

void setup() {

pinMode(12,OUTPUT);

period = 10;

}

void loop()

{

  digitalWrite(12,HIGH);

 

delay(period);

  digitalWrite(12,LOW);

 

delay(period);

}

We also focused on creating a program that measured how fast the user could tap their finger:

void setup() {

Serial.begin(9600);

pinMode(12,OUTPUT);

void loop(){

digitalWrite(12,HIGH);

digitalRead(12);

float x=digitalRead(12);

Serial.println(x);

delay(10);

}

Tones

int melody[] = {NOTE_C4, NOTE_G3,NOTE_G3, NOTE_A3, NOTE_G3,0, NOTE_B3, NOTE_C4};

// note durations: 4 = quarter note, 8 = eighth note, etc.:

int noteDurations[] = {4, 8, 8, 4,4,4,4,4 };

void setup() {

  // iterate over the notes of the melody:

  for (int thisNote = 0; thisNote < 8; thisNote++) {

    // to calculate the note duration, take one second

    // divided by the note type.

    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.

    int noteDuration = 1000/noteDurations[thisNote];

    tone(8, melody[thisNote],noteDuration);

    // to distinguish the notes, set a minimum time between them.

    // the note's duration + 30% seems to work well:

    int pauseBetweenNotes = noteDuration * 1.30;

    delay(pauseBetweenNotes);

    // stop the tone playing:

    noTone(8);

  }

}

void loop() {

  // no need to repeat the melody.

}