Diffuser

  Description
 
This second lab was an introduction to digital input and output on the Arduino Uno.
 
My hardware consisted of 3 LEDs (colors: red, green and blue) placed in parallel and spatially close to one another on the breadboard.   I designed a diffuser using a tennis ball packet and plastic bag.  I put this diffuser over the 3 LEDs so that when on in certain brightness configurations the diffusion of those 3 colors would produce other colors.
 
My code utilized if loops to set the LEDs to different brightness levels. The user input choices were the following (using example color red):
            ‘r’ = off
            ‘rr’ = medium brightness
            ‘rrr’ = high brightness
 
ComponentsUsed
 
1 – Arduino Uno
1 – Mini Breadboard
1 – Red LED
1 – Green LED
1 – Blue LED
1 – Diffuser (tennis ball holder and plastic bag)
3 – 220 Ω Resistors
 
Code
 
/*
 
 Serial Lab #2
 
 */
 
char serInString[100]; //creation of array
 
 
char LED;       //LED is a character input
int comLength;   //comLength is an integar input
 
int redPin = 9;       //Red LED connected to pin 9
int greenPin = 10;    //Green LED connected to pin 10
int bluePin = 11;     //Blue LED connected to pin 11
 
void setup() {
 
  pinMode(redPin, OUTPUT);      //sets the pins as output
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  Serial.begin(9600);
  analogWrite(redPin, 127);     //set red pin to mid brightness
  analogWrite(greenPin, 127);   //set green pin to mid brightness
  analogWrite(bluePin, 127);    //set blue pin to mid brightness
  Serial.println("enter desired brightness (ex. r for low, rr for med, rrr for high");
 
}
 
void loop () {
  //clear the string
 
  memset(serInString,0,100);    //red the serial port and create a string out of what you read
  readSerialString(serInString);
 
 LED = serInString[0];
 if(LED == 'r'){
 
  comLength = strlen(serInString);
  if(comLength == 1){
    analogWrite(redPin, 0);
    Serial.print("Turning red led off");
    Serial.println();}
  if(comLength == 2){
    analogWrite(redPin, 127);
    Serial.print("Turning red led to medium brightness");
    Serial.println();}
  if(comLength == 3){
    analogWrite(redPin, 255);
    Serial.print("Turning red led to high brightness");
    Serial.println();}
    }
   
if(LED == 'g'){
 
  comLength = strlen(serInString);
  if(comLength == 1){
    analogWrite(greenPin, 0);
    Serial.print("Turning green led off");
    Serial.println();}
  if(comLength == 2){
    analogWrite(greenPin, 127);
    Serial.print("Turning green led to medium brightness");
    Serial.println();}
  if(comLength == 3){
    analogWrite(greenPin, 255);
    Serial.print("Turning green led to high brightness");
    Serial.println();}
    }   
 
if(LED == 'b'){
 
  comLength = strlen(serInString);
  if(comLength == 1){
    analogWrite(bluePin, 0);
    Serial.print("Turning blue led off");
    Serial.println();}
  if(comLength == 2){
    analogWrite(bluePin, 127);
    Serial.print("Turning blue led to medium brightness");
    Serial.println();}
  if(comLength == 3){
    analogWrite(bluePin, 255);
    Serial.print("Turning blue led to high brightness");
    Serial.println();}
    }
 
  delay(100);  //wait a bit for serial data
 
}
 
void readSerialString (char *strArray) {
  int i = 0;
  if(!Serial.available()) {
    return;
  }
  while (Serial.available()) {
    strArray[i] = Serial.read();
    i++;
  }
}