Julia Burch's Labs
Lab 4
Lesson One
Blink
/*
* Blink
*
* The basic Arduino example. Turns on an LED on for 1/10 of a second,
* then off for 9/10 of a second, and so on... We use pin 13 because,
* depending on your Arduino board, it has either a built-in LED
* or a built-in resistor so that you need only an LED.
*
* http://www.arduino.cc/en/Tutorial/Blink
*/
int ledPin = 13; // LED connected to digital pin 13
void setup() // run once, when the sketch starts
{
pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop() // run over and over again
{
digitalWrite(ledPin, HIGH); // sets the LED on
delay(100); // waits for 1/10 of a second
digitalWrite(ledPin, LOW); // sets the LED off
delay(900); // waits for 9/10 of a second
}
Lesson Two
Blink Two
- Exercise 1 Modify the code so that the light is on for 100 msec and off for 900 msec.
- Exercise 2 Modify the code so that the light is on for 50 msec and off for 50 msec. What happens? 'The light begins to blink very rapidly.'
- Exercise 3 Modify the code so that the light is on for 10 ms and off for 10 ms. What happens? 'The light does not appear to blink.'
- Exercise 4 Now pick up the Arduino and gently wave it back and forth, in a dark room. What happens? 'The light trails dashes through the air as you wave the Arduino back and forth.'
- Exercise 5 What do you think is happening here? 'This occurs because the Arduino is blinking, it is just occurring too quickly for our eyes to perceive.'
Lesson Four
Hello World!
/*
* Hello World!
*
* This is the Hello World! for Arduino.
* It shows how to send data to the computer
*/
void setup() // run once, when the sketch starts
{
Serial.begin(9600); // set up Serial library at 9600 bps
}
void loop() // run over and over again
{
Serial.println("Hello world!"); // prints hello with ending line break
delay(1000);
}
Have Some Math!
/*
* Math is fun!
*/
int a = 5;
int b = 10;
int c = 20;
void setup() // run once, when the sketch starts
{
Serial.begin(9600); // set up Serial library at 9600 bps
Serial.println("Here is some math: ");
Serial.print("a = ");
Serial.println(a);
Serial.print("b = ");
Serial.println(b);
Serial.print("c = ");
Serial.println(c);
Serial.print("a + b = "); // add
Serial.println(a + b);
Serial.print("a * c = "); // multiply
Serial.println(a * c);
Serial.print("c / b = "); // divide
Serial.println(c / b);
Serial.print("b - c = "); // subtract
Serial.println(b - c);
}
void loop() // we need this to be here even though its empty
{
}