Code and Diagrams from Intro to Arduino talk given at Montana Programmers on Thursday, Marth 8, 2012

1 - Blink.fzz

1 - Blink.png

3 - Police.fzz

3 - Police.png

4 - Brightness Police.fzz

4 - Brightness Police.png

_1_Blink.ino

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */

void setup() {                
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(9, OUTPUT);     
}

void loop() {
  digitalWrite(9, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(9, LOW);    // set the LED off
  delay(1000);              // wait for a second
}

_3_Police.ino

int blue_brightness = 0;  // how bright the blue LED is
int red_brightness = 255; // how bright the red LED is
int blue_fadeAmount = 5; // how many points to fade the blue LED by
int red_fadeAmount = -5;  // how many points to fade the red LED by

void setup()  {
  // declare pins 9 and 10 to be an outputs:
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
} 

void loop()  { 
  // set the brightness levels:
  analogWrite(9, blue_brightness);
  analogWrite(10, red_brightness);

  // change the brightness for next time through the loop:
  blue_brightness = blue_brightness + blue_fadeAmount;
  red_brightness = red_brightness + red_fadeAmount;

  // reverse the direction of the fading at the ends of the fade: 
  if (blue_brightness == 0 || blue_brightness == 255) {
    blue_fadeAmount = -blue_fadeAmount ; 
  }
  if (red_brightness == 0 || red_brightness == 255) {
    red_fadeAmount = -red_fadeAmount ; 
  }   
  // set the delay based off of the light sensor reading so that 
  // the speed of fading is set by the ambient light amount  
  delay(5);                            
}

_4_BrightnessPolice.ino

int blue_brightness = 0;  // how bright the blue LED is
int red_brightness = 255; // how bright the red LED is
int blue_fadeAmount = 5; // how many points to fade the blue LED by
int red_fadeAmount = -5;  // how many points to fade the red LED by
int ambient = 0;

void setup()  {
  // declare pins 9 and 10 to be an outputs:
  pinMode(9, OUTPUT); // blue LED
  pinMode(10, OUTPUT); // red LED
  pinMode(A0, INPUT); // Light Sensor
} 

void loop()  { 
  // set the brightness levels:
  analogWrite(9, blue_brightness);
  analogWrite(10, red_brightness);

  ambient = analogRead(0); //grab the value from the light sensor

  // change the brightness for next time through the loop:
  blue_brightness = blue_brightness + blue_fadeAmount;
  red_brightness = red_brightness + red_fadeAmount;

  // reverse the direction of the fading at the ends of the fade: 
  if (blue_brightness == 0 || blue_brightness == 255) {
    blue_fadeAmount = -blue_fadeAmount ; 
  }
  if (red_brightness == 0 || red_brightness == 255) {
    red_fadeAmount = -red_fadeAmount ; 
  }   
  // set the delay based off of the light sensor reading so that 
  // the speed of fading is set by the ambient light amount  
  delay(30 % ambient);                            
}

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Code and Diagrams from Intro to Arduino talk given at Montana Programmers on Thursday, Marth 8, 2012