Tree diffuser turning 3 different range of purple

 

Description 

In this assignment I created a diffuser as a tree made by paper, cotton wool and stickys.

 

The 3  (R, G, B) LEDs atlernate between 3 different color shades - here 3 different shades of purple. This is defined in the loop by 'p' for purple. When 'p' is typed in the Serial Monitor the 3 different shades of purple will change continually.

 

*I had problems by defining an array that could change continually by only one  touch of the keyboard button ’p’. Elliot helped me with the coding part. 

 

Components 

3 x LED Lights (R, G, B) 

3 x resister

USB cable

Breadboard

Arduino

1 x elastic

4 x leads

Paper

Cotton wool

Stickys

 

 

Code 

/*

 * 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/

 */

 

char serInString[100];  // array that will hold the different bytes of the string. 100=100characters;

                        // -> you must state how long the array will be else it won't work properly

char colorCode;

int colorVal;

 

int redPin   = 9;   // Red LED,   connected to digital pin 9

int greenPin = 10;  // Green LED, connected to digital pin 10

int bluePin  = 11;  // Blue LED,  connected to digital pin 11

 

int redV[] = {0, 0, 0}; // defining redV array

int greenV[] = {0, 0, 0};  // defining greenV array

int blueV[] = {0, 0, 0}; // defining blueV array

int i = 0; //sets i to null

 

void setup() {

  pinMode(redPin,   OUTPUT);   // sets the pins as output

  pinMode(greenPin, OUTPUT);  

  pinMode(bluePin,  OUTPUT);

  Serial.begin(9600);

  analogWrite(redPin,   0);   // set them all to mid brightness

  analogWrite(greenPin, 0);   // set them all to mid brightness

  analogWrite(bluePin,  0);   // set them all to mid brightness

  Serial.println("enter color command (e.g. 'r43') :"); 

}

 

void loop () {

  // memset clear the string / string

  memset(serInString, 0, 100);

  //read the serial port and create a string out of what you read

  readSerialString(serInString);

   

  colorCode = serInString[0];

  if( colorCode == 'r' || colorCode == 'g' || colorCode == 'b' || colorCode == 'p' || colorCode == 'y') { //which colorcodes that are excepted

   /* colorVal = atoi(serInString+1);

    Serial.print("setting color ");

    Serial.print(colorCode);

    Serial.print(" to ");

    Serial.print(colorVal);

    Serial.println();

    serInString[0] = 0;     */    // indicates we've used this string

   

    if(colorCode == 'r') //sets the value of red

   {

      /*  analogWrite(redPin, 255);

       analogWrite(greenPin, 0);

       analogWrite (bluePin, 0);

   */

     redV[0] = 10;

     redV[1] = 155;

     redV[2] = 225;

     greenV[0] = 0;

     greenV[1] = 0;

     greenV[2] = 0;

     blueV[0] = 0;

     blueV[1] = 0;

     blueV[2] = 0;

    }

     

      else if (colorCode == 'g') //sets the value of green

      {

      /* analogWrite(greenPin, 255);

       analogWrite(redPin, 0);

       analogWrite (bluePin, 0); */

     

     redV[0] = 0;

     redV[1] = 0;

     redV[2] = 0;

     greenV[0] = 10;

     greenV[1] = 155;

     greenV[2] = 225;

     blueV[0] = 0;

     blueV[1] = 0;

     blueV[2] = 0;

     

      }

     

    else if (colorCode == 'b') //sets the value of blue

    {

      /*analogWrite(bluePin, 255);  

      analogWrite(greenPin, 0);

      analogWrite (redPin, 0);*/

     redV[0] = 0;

     redV[1] = 0;

     redV[2] = 0;

     greenV[0] = 0;

     greenV[1] = 0;

     greenV[2] = 0;

     blueV[0] = 10;

     blueV[1] = 155;

     blueV[2] = 255;

     

    }

  

  else if (colorCode == 'p') //sets the value of 3 different shades of purple

  {

     redV[0] = 150;

     redV[1] = 255;

     redV[2] = 255; //light purple

     greenV[0] = 0;

     greenV[1] = 10;

     greenV[2] = 0; //light purple

     blueV[0] = 102;

     blueV[1] = 200;

     blueV[2] = 255; // light purple

   }

  

  }//if statement, INSIDE loop so don't have to continue with pressing the 'key'

  

   analogWrite(redPin, redV[i]);

   analogWrite(bluePin, blueV[i]);

   analogWrite(greenPin, greenV[i]);

    

   Serial.println(redV[i] + greenV[i] + blueV[i]);

 

  if (i<2) { //runs the array from 0-2

  i++;

  }

  else { // when array reaches = 2, start at 0 (again)

  i = 0;

  }

   

  delay(700);  // set the waiting time, wait a bit, for serial data

 

}

 

//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++;

  }

}

 

 

 

 

 

• 3 x LED Lights (R, G, B) 
• 3 x resister
• USB cable
• Breadboard
• Arduino
• 1 x elastic
• 4 x leads
• Paper
• Cotton wool
• Stickys

Code