Assignment: Digital I/O with Arduino Boards + Diffuser

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Assignment: Digital I/O with Arduino Boards + Diffuser
Collaborators:

Description

Create a diffuser and a system in which entering r, g, or b increases the intensity by 10.

I created the diffuser with an empty opaque white medicine bottle stuffed with the fluffy filling from class.

For bonus, I also include code that lets the user choose red, blue, green, cyan, yellow, or magenta.

Components Used

• 3 x Light Emitting Diode (LED)
• 3 x Resistor

Arduino Code

/* 
 * Serial RGB LED
 * ---------------
 * Serial commands control the brightness of R,G,B LEDs 
 *
 * Command structure is "<colorCode>", where "colorCode" is
 * combinations of "r","g",or "b." Each letter will raise the corresponding color by 10.
 *
 * 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 redVal = 127;
int greenVal = 127;
int blueVal = 127;

int percentage = 10; // how much the color value goes up for each letter pressed

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,   redVal);   // set them all to mid brightness
  analogWrite(greenPin, greenVal);   // set them all to mid brightness
  analogWrite(bluePin,  blueVal);   // set them all to mid brightness
  Serial.println("enter color command (e.g. 'rrr') :");  
}

void loop () {
  //read the serial port and create a string out of what you read
  readSerialString(serInString);
  
  for (int i = 0; i < 100; i++) {
    colorCode = serInString[i];
    if (colorCode == '\0') {
        break;
    } else if (colorCode == 'r') {
        redVal = (redVal + percentage) % 255;
        analogWrite(redPin, redVal);
        Serial.print("Setting r to ");
        Serial.print(redVal);
        Serial.println();
    } else if (colorCode == 'g') {
        greenVal = (greenVal + percentage) % 255;
        analogWrite(greenPin, greenVal);
        Serial.print("Setting g to ");
        Serial.print(greenVal);
        Serial.println();
    } else if (colorCode == 'b') {
        blueVal = (blueVal + percentage) % 255;
        analogWrite(bluePin, blueVal);
        Serial.print("Setting b to ");
        Serial.print(blueVal);
        Serial.println();
    }
  }
  for (int i = 0; i < 100; i++) {  
    serInString[i] = '\0';      // indicates we've used this string
  }
  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++;
  }
}


/* 
 * Serial RGB LED
 * ---------------
 * Serial commands control the brightness of R,G,B LEDs 
 *
 * Command structure is "<colorCode>", where "colorCode" is
 * "red," "green," "blue," "black," "white," "cyan," "magenta," or
 * "yellow."
 *
 * 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
int redVal = 127;
int greenVal = 127;
int blueVal = 127;

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,   redVal);   // set them all to mid brightness
  analogWrite(greenPin, greenVal);   // set them all to mid brightness
  analogWrite(bluePin,  blueVal);   // set them all to mid brightness
  Serial.print("enter color command ");
  Serial.println("red, green, blue, cyan, yellow, or magenta) :");  
}

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

  if (strcmp(serInString, "red") == 0) {
    analogWrite(redPin, 255);
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 0);
  } else if (strcmp(serInString, "green") == 0) {
    analogWrite(redPin, 0);
    analogWrite(greenPin, 255);
    analogWrite(bluePin, 0);
  } else if (strcmp(serInString, "blue") == 0) {
    analogWrite(redPin, 0);
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 255);
  } else if (strcmp(serInString, "cyan") == 0) {
    analogWrite(redPin, 0);
    analogWrite(greenPin, 255);
    analogWrite(bluePin, 255);
  } else if (strcmp(serInString, "yellow") == 0) {
    analogWrite(redPin, 255);
    analogWrite(greenPin, 255);
    analogWrite(bluePin, 0);
  } else if (strcmp(serInString, "magenta") == 0) {
    analogWrite(redPin, 255);
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 255);
  }
  for (int i = 0; i < 100; i++) {  
    serInString[i] = '\0';      // indicates we've used this string
  }
  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++;
  }
}

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