LAB2

Description

Use Keyboard to control LED color combination.

Components Used

• R,G,B LEDs
• Resistors 220
• Wires
• Diffuser

Arduino Code

/*
 * Serial RGB LED - TUI Homework
 * ---------------
 * Serial commands control the brightness of R,G,B LEDs
 *
 * Command structure is multiple typing or 'r' 'g' 'b' keys
 */

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

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 no brightness
  analogWrite(greenPin, 0);   // set them all to no brightness
  analogWrite(bluePin,  0);   // set them all to no brightness
  Serial.println("play light with 'r','g','b' keys :"); 
}

void loop () {
  // clear the string
  memset(serInString, 0, 100);
  //read the serial port and create a string out of what you read
  readSerialString(serInString);
   
  colorCode = serInString[0];

    serInString[0] = 0;                   // indicates we've used this string
    if(colorCode == 'r')
      analogWrite(redPin, 51);
    else if(colorCode == 'rr')
      analogWrite(redPin, 102);
    else if(colorCode == 'rrr')
      analogWrite(redPin, 153);
    else if(colorCode == 'rrrr')
      analogWrite(redPin, 204);
    else if(colorCode == 'rrrrr')
      analogWrite(redPin, 255);
    else if(colorCode == 'g')
      analogWrite(greenPin, 51);
    else if(colorCode == 'gg')
      analogWrite(greenPin, 102);
    else if(colorCode == 'ggg')
      analogWrite(greenPin, 153);
    else if(colorCode == 'gggg')
      analogWrite(greenPin, 204);
    else if(colorCode == 'ggggg')
      analogWrite(greenPin, 255);
    else if(colorCode == 'b')
      analogWrite(bluePin, 51);
    else if(colorCode == 'bb')
      analogWrite(bluePin, 102);
    else if(colorCode == 'bbb')
      analogWrite(bluePin, 153);
    else if(colorCode == 'bbbb')
      analogWrite(bluePin, 204);
    else if(colorCode == 'bbbbb')
      analogWrite(bluePin, 255);

 
  delay(100);  // 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++;
  }
}