Tangible User Interfaces - Fall 2011

 

/* 

 * Serial RGB LED

 * ---------------

 * Serial commands control the brightness of R,G,B LEDs

 *

 * Command structure is "<colorCode><colorVal>", where "colorCode" is

 * one of "r","g",or "b" and "colorVal" is a number 0 to 255.

 * E.g. "r0"   turns the red LED off.  

 *      "g127" turns the green LED to half brightness

 *      "b64"  turns the blue LED to 1/4 brightness

 *

 * Created 18 October 2006

 * copyleft 2006 Tod E. Kurt <tod@todbot.com

 * http://todbot.com/

 *

 * John utilized the code and changed it 09/13/2011

 * it is buggy but it works! 

 */

 

 //------------------------------------------------------------------------------------------

char serInString[100];

//int photocellPin = 2;   // the cell and 10K pulldown are connected to a0

//int photocellReading;   // the analog reading from the sensor divider

int LEDpinRed = 3;      // Red LED

int LEDpinGreen = 6;    // Green LED  

int LEDpinBlue = 5;     // Blue LED

//int LEDbrightness;      //the value given by the PhotoCell

int mySpeed = 100;      //the update speed

int myCounter = 0;     

int colorCode;

 

unsigned int LEDredValue = 220;

unsigned int LEDgreenValue = 10;

unsigned int LEDblueValue = 10;

 

 //------------------------------------------------------------------------------------------

 //

void setup() {

  pinMode(LEDpinRed,   OUTPUT); 

  pinMode(LEDpinGreen, OUTPUT);   

  pinMode(LEDpinBlue,  OUTPUT);

  Serial.begin(9600);

  analogWrite(LEDpinRed,   LEDredValue);

  analogWrite(LEDpinGreen, LEDgreenValue);

  analogWrite(LEDpinBlue,  LEDblueValue);

}

 

 //------------------------------------------------------------------------------------------

 //

void loop () {

  memset(serInString, 0, 100);     // clear the string

  readSerialString(serInString);   //read the serial port and create a string out of what you read

  myInput(serInString, 100);

  readSerialString(serInString);

   delay(mySpeed);                  //update speed

 //------------------------------------------------------------------------------------------

 // PHOTOCELL

 // photocellReading = analogRead(photocellPin);             

 // Serial.println(photocellReading);                       // the raw analog reading

 // photocellReading =  photocellReading;                    //now we have to map 0-1023 to 0-255 since thats the range analogWrite uses

 // LEDbrightness = map(photocellReading, 0, 1023, 0, 255);  //added this to give output of photocell value

 }

 

 //------------------------------------------------------------------------------------------

 // ANALYZING THE INPUT

 

 void myInput(char *strArray, int length) {

 

  while (myCounter < length && strArray[myCounter] != '\0') {

    

    colorCode = strArray[myCounter];

 

    if(colorCode == 'r') {

     LEDredValue = (LEDredValue + 10);

     Serial.print("Red Value: ");

     Serial.println(LEDredValue);

     analogWrite(LEDpinRed, LEDredValue);

    } 

 

    else if(colorCode == 'g') {

      LEDgreenValue = (LEDgreenValue + 10);

      Serial.print("Green Value: ");

      Serial.println(LEDgreenValue);

      analogWrite(LEDpinGreen, LEDgreenValue);

    } 

 

    else if(colorCode == 'b') {

      LEDblueValue = (LEDblueValue + 10);

      Serial.print("Blue Value: ");

      Serial.println(LEDblueValue);

      analogWrite(LEDpinBlue, LEDblueValue);

    }

  ++myCounter;

  }

}

 

 //------------------------------------------------------------------------------------------

 // READ STRING AND STORE IN AN ARRAY

 

//read a string from the serial and store it in an array

//you must supply the array variable

 

void readSerialString (char *strArray) {

  int i = 0;

  if(!Serial.available()) {

    return;

  }

  while (Serial.available()) {

    strArray[i] = Serial.read();

    i++;

  }

} //end

 //------------------------------------------------------------------------------------------