Day 1: (Mon Aug 26) Welcome, Arduino Introduction

Notes for 2019-08-26. See also the Fall 2019 Calendar.

Agenda

1. Welcome.

   • What is IDeATe?

   • What is Physical Computing? What is a kinetic system?

   • Project focus: Pittsburgh Children’s Museum. Note that several Friday morning trips are mandatory.

   • Unspoken prerequisites.

   • 16-223 is a good portal for the IDeATe Physical Computing Minor

2. Administrative

   • Enrollment and waitlist.

     • Course site: https://courses.ideate.cmu.edu/16-223

       • Daily log pages (like this one): Daily Agenda Logbook

       • Calendar: Fall 2019 Calendar

       • 16-223 Student Work

     • Weekend trips and child clearances.

     • Laser cutter policies: these have changed for F19.

       • Laser cutter safety training courses: see IDeATe Laser Cutter Policy

       • New buddy system: don’t ever cut alone. Lasers will be available 10AM-10PM (no more middle of the night).

       • New mandatory IDeATe training, even for previous users: 4:30PM on Sep 4, 5, 6, 9, 10, 11.

       • Fire Extinguisher training. Sign up via BioRaft, convenient sessions will be in HL A5 on Sep 3 at 4:30, 5:00, 5:30, 6:00.

   • Attendance and tardiness policies.

   • Electronic device policies.

   • Resources

     • 16-223-F19 Canvas.

     • Card access.

     • Physical Computing Lab use and abuse.

     • We are sharing the room with six other classes (see IDeATe PhysComp Lab Calendar).

     • IDeATe Computing Virtual Cluster.

     • Office hours: TBD

   • Name tags and photos.

3. Assignments

   • Prepare for PA child clearances. See Child Clearances and the clearance authorization form

   • If you already have clearances, please come on time and I’ll take you aside for personal tutorial.

4. In-class

   1. Brief introduction to the Arduino.

   2. Each person pick up an Arduino, USB cable, cluster laptop, breadboard, speaker, dropping resistor, and a few jumper wires.

   3. Crash course in Arduino basics.

   4. Write an Arduino sketch to play tones in sequence to create a siren. For now, it is easiest to use tone() and delay() inside loop().

   5. Face photos.

   6. Related exercises: Exercise: Arduino Introduction, Exercise: Coding, Compiling, Deploying, Exercise: Unipolar Drivers

   7. If time permits: rewrite your sketch without using delay(), then add a simultaneous fast-blink on the LED. For ideas, see Exercise: Event-Loop Programming

   8. At the end of class, please return the Arduinos and other components.

Figures

Lecture code samples

(See also Lecture Sample Code).

// 1. blink the onboard Arduino LED on pin 13.
// 2. demonstrate setup(), loop()
// 3. demonstrate pinMode(), digitalWrite(), delay()

void setup()
{
  pinMode(13, OUTPUT);
}

void loop()
{
  digitalWrite(13, HIGH);
  delay(1000);

  digitalWrite(13, LOW);
  delay(1000);
}

// 1. generate tones on a speaker on pin 5
// 2. demonstrate tone(), noTone(), delay()

void setup()
{
  // empty body, tone() configures a pin for output
}
void loop()
{
  tone(5, 440);
  delay(1000);

  noTone(5);
  delay(1000);

  tone(5, 660);
  delay(1000);
}

// 1. generate chromatic tones on a speaker on pin 5
// 2. demonstrate for loops, int and float variables

void setup()
{
}

void loop()
{
  float freq = 440.0;
  for (int i = 0; i < 24; i = i + 1) {
    tone(5, freq);
    delay(200);
    freq = freq * 1.0595;
  }
  noTone(5);
  delay(1000);
}

// 1. measure execution time
// 2. demonstrate the firmware clock
// 3. demonstrate debugging on the serial port

void setup()
{
  Serial.begin(115200);
}

long last_time = 0;

void loop()
{
  long now = micros();

  Serial.print(millis());
  Serial.print(" ");  

  Serial.print(micros());
  Serial.print(" ");

  Serial.println(now - last_time);

  last_time = now;
}

// 1. generate complex waveform on a speaker on pin 5
// 2. demonstrate execution speed, firmware clocks, bit-banging logic

void setup()
{ 
  pinMode(5, OUTPUT);
}
void loop()
{
  long now = micros();
  bool square1 = (now % 2274) < 1136;
  bool square2 = (now % 1516) < 758;
  digitalWrite(5, square1 ^ square2);
}