Go Down

Topic: Arduino Project (Read 756 times) previous topic - next topic

bhann1

Feb 24, 2012, 08:07 pm Last Edit: Feb 24, 2012, 08:17 pm by CrossRoads Reason: 1
Arduino RGB LED color fade

When the potentiometer is = 0 the light will shine white
When you began to turn it to the right the LED will cycle through all the colors
Once it reaches <899 the LED will continuously cycle through colors


code:

(tags added by moderator)
Code: [Select]

int LEDGreen=9;
int LEDBlue=10;
int LEDRed=11;



int sensorPin=0;
int val;

// Output
int redPin = 9;   // Red LED,   connected to digital pin 9
int grnPin = 10;  // Green LED, connected to digital pin 10
int bluPin = 11;  // Blue LED,  connected to digital pin 11

// Color arrays
int black[3]  = { 0, 0, 0 };
int white[3]  = { 100, 100, 100 };
int red[3]    = { 100, 0, 0 };
int green[3]  = { 0, 100, 0 };
int blue[3]   = { 0, 0, 100 };
int yellow[3] = { 40, 95, 0 };
int dimWhite[3] = { 30, 30, 30 };
// etc.

// Set initial color
int redVal = black[0];
int grnVal = black[1];
int bluVal = black[2];

int wait = 1;      // 10ms internal crossFade delay; increase for slower fades
int hold = 1;       // Optional hold when a color is complete, before the next crossFade
int DEBUG = 1;      // DEBUG counter; if set to 1, will write values back via serial
int loopCount = 0; // How often should DEBUG report?
int repeat = 0;     // How many times should we loop before stopping? (0 for no stop)
int j = 0;          // Loop counter for repeat

// Initialize color variables
int prevR = redVal;
int prevG = grnVal;
int prevB = bluVal;



void setup(){
 Serial.begin(9600);
 pinMode(LEDRed,OUTPUT);
 pinMode(LEDGreen,OUTPUT);
 pinMode(LEDBlue,OUTPUT);  
}

void loop(){
 
 val=map(analogRead(sensorPin),0,1023,0,900);
 Serial.println(val);
 
 if(val>=899)  {
   
  crossFade(red);
 crossFade(green);
 crossFade(blue);
   //cycle colors
 } else if(val==0){
   analogWrite(LEDRed, 0);
   analogWrite(LEDGreen, 0);
   analogWrite(LEDBlue, 0);  

 } else {
 
  if (val < 1){
    analogWrite(LEDRed, 0);
   analogWrite(LEDGreen, 0);
   analogWrite(LEDBlue, 0);
   Serial.println("boo");
 } else if (val<150) {
   analogWrite(LEDRed,0);
   analogWrite(LEDBlue,255);
   analogWrite(LEDGreen,255);
Serial.println("150");  
 } else if (val<300) {
   analogWrite(LEDRed,map(val,150,300,0,255));
   analogWrite(LEDBlue,map(val,150,300,255,0));
   analogWrite(LEDGreen,255);
 } else if (val<450) {
   analogWrite(LEDRed,255);
   analogWrite(LEDBlue,0);
   analogWrite(LEDGreen,255);  
 } else if (val<600) {
   analogWrite(LEDRed,255);
   analogWrite(LEDBlue,map(val,450,600,0,255));
   analogWrite(LEDGreen,map(val,450,600,255,0));
 } else if (val<750) {
   analogWrite(LEDRed,255);
   analogWrite(LEDBlue,255);
   analogWrite(LEDGreen,0);  
 } else if (val<900) {
   analogWrite(LEDRed,map(val,750,900,255,0));
   analogWrite(LEDBlue,255);
   analogWrite(LEDGreen,map(val,750,900,0,255));
 }
   
   //stop cycling colors
 }
 
 
 
 
 delay(10);
}



/* BELOW THIS LINE IS THE MATH -- YOU SHOULDN'T NEED TO CHANGE THIS FOR THE BASICS
*
* The program works like this:
* Imagine a crossfade that moves the red LED from 0-10,
*   the green from 0-5, and the blue from 10 to 7, in
*   ten steps.
*   We'd want to count the 10 steps and increase or
*   decrease color values in evenly stepped increments.
*   Imagine a + indicates raising a value by 1, and a -
*   equals lowering it. Our 10 step fade would look like:
*
*   1 2 3 4 5 6 7 8 9 10
* R + + + + + + + + + +
* G   +   +   +   +   +
* B     -     -     -
*
* The red rises from 0 to 10 in ten steps, the green from
* 0-5 in 5 steps, and the blue falls from 10 to 7 in three steps.
*
* In the real program, the color percentages are converted to
* 0-255 values, and there are 1020 steps (255*4).
*
* To figure out how big a step there should be between one up- or
* down-tick of one of the LED values, we call calculateStep(),
* which calculates the absolute gap between the start and end values,
* and then divides that gap by 1020 to determine the size of the step  
* between adjustments in the value.
*/

int calculateStep(int prevValue, int endValue) {
 int step = endValue - prevValue; // What's the overall gap?
 if (step) {                      // If its non-zero,
   step = 1020/step;              //   divide by 1020
 }
 return step;
}

/* The next function is calculateVal. When the loop value, i,
*  reaches the step size appropriate for one of the
*  colors, it increases or decreases the value of that color by 1.
*  (R, G, and B are each calculated separately.)
*/

int calculateVal(int step, int val, int i) {

 if ((step) && i % step == 0) { // If step is non-zero and its time to change a value,
   if (step > 0) {              //   increment the value if step is positive...
     val += 1;          
   }
   else if (step < 0) {         //   ...or decrement it if step is negative
     val -= 1;
   }
 }
 // Defensive driving: make sure val stays in the range 0-255
 if (val > 255) {
   val = 255;
 }
 else if (val < 0) {
   val = 0;
 }
 return val;
}

/* crossFade() converts the percentage colors to a
*  0-255 range, then loops 1020 times, checking to see if  
*  the value needs to be updated each time, then writing
*  the color values to the correct pins.
*/

void crossFade(int color[3]) {
 // Convert to 0-255
 int R = (color[0] * 255) / 100;
 int G = (color[1] * 255) / 100;
 int B = (color[2] * 255) / 100;

 int stepR = calculateStep(prevR, R);
 int stepG = calculateStep(prevG, G);
 int stepB = calculateStep(prevB, B);

 for (int i = 0; i <= 1020; i++) {
   redVal = calculateVal(stepR, redVal, i);
   grnVal = calculateVal(stepG, grnVal, i);
   bluVal = calculateVal(stepB, bluVal, i);

   analogWrite(redPin, redVal);   // Write current values to LED pins
   analogWrite(grnPin, grnVal);      
   analogWrite(bluPin, bluVal);

   delay(wait); // Pause for 'wait' milliseconds before resuming the loop

   if (DEBUG) { // If we want serial output, print it at the
     if (i == 0 or i % loopCount == 0) { // beginning, and every loopCount times
       Serial.print("Loop/RGB: #");
       Serial.print(i);
       Serial.print(" | ");
       Serial.print(redVal);
       Serial.print(" / ");
       Serial.print(grnVal);
       Serial.print(" / ");  
       Serial.println(bluVal);
     }
     DEBUG += 1;
   }
 }
 // Update current values for next loop
 prevR = redVal;
 prevG = grnVal;
 prevB = bluVal;
 delay(hold); // Pause for optional 'wait' milliseconds before resuming the loop
}



Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy