Rainbow Ball

Description

I created a rainbow ball. It allows users to type the initial character of a rainbow color, and LEDs inside the ball will graduate changes their brightness to show this color. It accepts 7 characters from users:

  1. ‘r’: set the ball to red;
  2. ‘o’: set the ball to orange;
  3. ‘y’: set the ball to yellow;
  4. ‘g’: set the ball to green;
  5. ‘c’: set the ball to cyan;
  6. ‘b’: set the ball to blue;
  7. ‘p’: set the ball to purple.

Components

  • 1 Arduino
  • 1 Diffuser (cotton ball)
  • 3 LEDs
  • 3 Resistors (220Ω)
  • 7 Jumper wires
  • 1 USB cable
  • 1 Breadboard

Code

char serInString[100];  
int redVal, greenVal, blueVal;
int redCurr = 127;
int greenCurr = 127;
int blueCurr = 127;
int increRed, increBlue, increGreen;
int redPin   = 9;   
int greenPin = 10;  
int bluePin  = 11; 
int redPre = 127;
int bluePre = 127;
int greenPre = 127;

void setup() {
  pinMode(redPin,   OUTPUT);  
  pinMode(greenPin, OUTPUT);   
  pinMode(bluePin,  OUTPUT);
  Serial.begin(9600);
  analogWrite(redPin,   redPre);   
  analogWrite(greenPin, bluePre);   
  analogWrite(bluePin,  greenPre);  
  Serial.println("enter a rainbow color 
  ('r' for Red, 
  'o' for Orange,
  'y' for Yellow, 
  'g' for Green, 
  'c' for Cyan, 
  'b' for Blue,
  'p' for Purple)");  
}

void printSerial() {
  Serial.print("setting color ");
  Serial.print("red");
  Serial.print(" to ");
  Serial.print(redCurr);
  Serial.println(); 

  Serial.print("setting color ");
  Serial.print("blue");
  Serial.print(" to ");
  Serial.print(blueCurr);
  Serial.println();

  Serial.print("setting color ");
  Serial.print("green");
  Serial.print(" to ");
  Serial.print(greenCurr);
  Serial.println();
}

void loop () {
  memset(serInString, 0, 100);
  readSerialString(serInString);
    
  if( serInString[0]== 'r') {
    redCurr = 255;
    greenCurr = 0;
    blueCurr = 0;
    printSerial();
    serInString[0] = ' ';                  
  }
  if( serInString[0]== 'o') {
    redCurr = 255;
    greenCurr = 127;
    blueCurr = 0;
    printSerial();
    serInString[0] = ' ';                  
  }
  if( serInString[0]== 'y') {
    redCurr = 255;
    greenCurr = 255;
    blueCurr = 0;
    printSerial();
    serInString[0] = ' ';  
  }
  if( serInString[0]== 'g') {
    redCurr = 0;
    greenCurr = 255;
    blueCurr = 0;
    printSerial();
    serInString[0] = ' ';
  }
  if( serInString[0]== 'c') {
    redCurr = 0;
    greenCurr = 255;
    blueCurr = 255;
    printSerial();
    serInString[0] = ' ';
  }
  if( serInString[0]== 'b') {
    redCurr = 0;
    greenCurr = 0;
    blueCurr = 255;
    printSerial();
    serInString[0] = ' '; 
  }
  if( serInString[0]== 'p') {
    redCurr = 127;
    greenCurr = 0;
    blueCurr = 255;
    printSerial();
    serInString[0] = ' '; 
  }
  
  if(redPre > redCurr) {
    increRed = -1;
  }
  else {
    increRed = 1;
  }
  redVal = redPre;
  while(redVal != redCurr) {
    analogWrite(redPin, redVal);
    delay(10);
    redVal += increRed;
  }
  redPre = redCurr;
  
  if(bluePre > blueCurr) {
    increBlue = -1;
  }
  else {
    increBlue = 1;
  }
  blueVal = bluePre;
  while(blueVal != blueCurr) {
    analogWrite(bluePin, blueVal);
    delay(10);
    blueVal += increBlue;
  }
  bluePre = blueCurr;
  if(greenPre > greenCurr) {
    increGreen = -1;
  }
  else {
    increGreen = 1;
  }

  greenVal = greenPre;
  while(greenVal != greenCurr) {
    analogWrite(greenPin, greenVal);
    greenVal += increGreen;
    delay(10);
  }
  greenPre = greenCurr;
  
delay(100);
}

void readSerialString (char *strArray) {
  int j = 0;
  if(!Serial.available()) {
    return;
  }
  while (Serial.available()) {
    strArray[j] = Serial.read();
    j++;
  }
}


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