Check out http:// http://todbot.com/blog/bionicarduino/

There is a sketch for a RGB mood light where it cycles the intensity of each pin of the RGB led in a similar fashion to fade through different colors.  Perhaps you could modify this code to achieve your goal.

That or i have no idea what you are atempting ;D.

How about a 2 or more part tutorial via links.  Progressive learning is easy when there are links on where to go next to expand on the current topic.

Correct.  I would like to make a function for future use.  So what I am really interested in is the code used in the the Arduino function or comparable code to write a similar function.

I could always rewrite that example or the code inside the Arduino function each time but I'm much to lazy for that.      

To generate a random number within a specified range.

I saw this example online however I wanted to see the Arduino code version.  If it differs I would prefer to use it as opposed to what I found.

Code:

//generates a psuedo-random integer between 0 and max
int randint(int max)
{
    return int(max*rand()/(RAND_MAX+1.0));
}

//generates a psuedo-random integer between min and max
int randint(int min, int max)
{
    if (min>max)
    {
        return max+int((min-max+1)*rand()/(RAND_MAX+1.0));
    }
    else
    {
        return min+int((max-min+1)*rand()/(RAND_MAX+1.0));
    }
}

 

@ programmer

I am aware of that however their is no, at least no std, max or min/max functionally.  But thanks for the heads up.

@AlphaBeta

Thanks  

Hello,

Would someone be able to point me to where I could find the C code used for the random max and random min/max functions.  I would like to port them to an ATtiny project I am working on among other things.  

I've found various versions online however I've never had any issues using this function so If I could continue to use it that would be great.  

Thanks

Can any pin on arduino be used with interrupts, and can I have several of them?

You can use digital pins 2 or 3 for interrupts see this page,  http://arduino.cc/en/Reference/AttachInterrupt

If the interrupt interrupts a main loop, after execution the function does it get back to the next command of the loop before interrupting or to beginning of the loop?

In my experience to the next command in the loop, and I think the interrupt should always interrupt the main loop.  Thats the only code running, nothing else need interruption .  Someone correct me if I am wrong.

Done!
At lease with the frame of the sketch.  
I added "if (Mode != 2) break;" to each for statement, adjusting the 2 to whatever the # Mode it was in obviously.

Code:

 if (Mode == 2) {
    reset();
    for (int greenVal=0; greenVal<=255; greenVal++) {
      analogWrite(greenLedPin, greenVal);
      if (Mode != 2) break;
      delay(10);
    }
    for (int greenVal=255; greenVal>=0; greenVal--) {
      analogWrite(greenLedPin, greenVal);
      if (Mode != 2) break;
      delay(10);
    }

That seems to have done the trick.  Ironic how after reading you advice the next chapter in my C book explained continue, break, and switch case.
In any case thanks again.

For starters, thanks for the info.  

As for the pot input being more responsive, as soon as I read your response the fact that I should have put an analog read in each for statement became painfully obvious to me.  I adjusted the code and it works great.  I plan on looking into your second suggestion for this issue later just to expand my knowledge.

When next I get some free time I plan on adding code to monitor the button presses in the fades as suggested, I'll let you know how that turns out.

As far as the structure of my code, listed below is the hopefully not too poorly written sketch.  I am slowly adding functionality as I go and troubleshooting as req'd.

Code:

/*
 *RGB LED LAMP PROJECT
 *
 */
volatile int Mode = 0;

int fast = 0;

int redPotPin = 1;    // select the input pin for the potentiometer
int greenPotPin = 2;
int bluePotPin = 3;

int redLedPin = 9;   // select the pin for the LED
int greenLedPin = 10;
int blueLedPin = 11;

int redVal = 0;       // variable to store the value
int greenVal = 0;
int blueVal = 0;

void setup() {

  attachInterrupt(0, next, RISING); // Button attached to interrupt 0, digital pin 2,
                                    // to trigger fuction next when button goes from low to high  
  Serial.begin(9600);

  pinMode(redLedPin, OUTPUT);  // declare the ledPin as an OUTPUT
  pinMode(greenLedPin, OUTPUT);
  pinMode(blueLedPin, OUTPUT);
}

void loop(){


  // Now do whatever the Mode indicates
  if (Mode == 0) {
    redVal = analogRead(redPotPin);    // read the value from the sensor
    analogWrite(redLedPin, redVal/4);  // convert from 0-1023 to 0-255 and apply value to LED

    greenVal = analogRead(greenPotPin);  
    analogWrite(greenLedPin, greenVal/4);  

    blueVal = analogRead(bluePotPin);    
    analogWrite(blueLedPin, blueVal/4);  
  }

  if (Mode == 1) {
    {
      analogWrite(greenLedPin, 0);
      analogWrite(redLedPin, 0);
      analogWrite(blueLedPin, 0);
      fast = analogRead(redPotPin)/50;
      fast = max(fast, 1);              // limits fast to a min. of 1 by selecting
    }                                   // The higher of the two values ,fast or 1,
                                        // and asigining it to fast.  
    for (int redVal=0; redVal<=255; redVal++) {
      analogWrite(redLedPin, redVal);
      fast = analogRead(redPotPin)/50;
      fast = max(fast, 1);  
      delay(fast);
    }
    for (int redVal=255; redVal>=0; redVal--) {
      analogWrite(redLedPin, redVal);
      fast = analogRead(redPotPin)/50;
      fast = max(fast, 1);  
      delay(fast);
    }
  }

  if (Mode == 2) {
    for (int greenVal=0; greenVal<=255; greenVal++) {
      analogWrite(greenLedPin, greenVal);
      delay(10);
    }
    for (int greenVal=255; greenVal>=0; greenVal--) {
      analogWrite(greenLedPin, greenVal);
      delay(10);
    }

  }
  if (Mode == 3)  {
    for (int blueVal=0; blueVal<=255; blueVal++) {
      analogWrite(blueLedPin, blueVal);
      delay(10);
    }
    for (int blueVal=255; blueVal>=0; blueVal--) {
      analogWrite(blueLedPin, blueVal);
      delay(10);
    }

  }    
}

void next()
{
  if (Mode == 0) {          //
    Mode = 1;               //
  }
  else {
    if (Mode == 1) {        //
      Mode = 2;             //
    }
    else {
      if (Mode == 2) {      //
        Mode = 3;           //
      }
      else {
        if (Mode == 3) { // above 3 it returnes to 0
          Mode = 0;           //
        }
      }
    }
  }
}

Any further input/suggestions are welcome.

Thanks again.

Greetings,

I used AttachInterupt and a tactile switch to cycle between several RGB LED sequences/fades.  When the button is pressed the mode will change however it only changes after the full code of the current sequence completes.  For instance if you press the button in during the fades two for statements the current sequence completes prior to moving to the next sequence, or the one after the next if you press the button twice.

Is there a way to have the program respond to a button press in real time?

Also I use a pot to control the speed of the fade in one of the sequences.  Again I must wait till both for statements complete until the duration of the delay, controlled by the pot, is reassessed.  Is it possible to have this value update in real time?

Thanks again.

Cool,

Thanks

I was writhing a sketch and went to name an int "speed" however the word turned orange, as far as I could tell as I am partially color blind,  as if it was a function or something.  When I searched the extended reference section of the website I found no mention of such a command.

Anyone know what this is?

Hello,

For starters all sketches require a loop.  I recommend you read the contents of this link http://www.arduino.cc/en/Tutorial/Sketch , especially the last part entitled "setup() and loop()"

Another good piece of reading material is this http://www.freeduino.org/files/arduino_notebook_v1-1.pdf , if you read the section entitled "for" on page 21 you will understand

how to change this code to exicute x number of times and then move on to something else like a different sequence , or even just stop.

Maybe i should not even care because the program compiles and runs fine as far as i can tell but when i hit auto format i get the following error message.

Code:

Binary sketch size: 6776 bytes (of a 14336 byte maximum)

java.lang.ArrayIndexOutOfBoundsException: 10
      at processing.app.tools.AutoFormat.show(AutoFormat.java:561)
      at processing.app.Editor$15.actionPerformed(Editor.java:728)
      at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
      at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
      at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
      at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
      at javax.swing.AbstractButton.doClick(AbstractButton.java:334)
      at javax.swing.AbstractButton.doClick(AbstractButton.java:282)
      at javax.swing.plaf.basic.BasicMenuItemUI$Actions.actionPerformed(BasicMenuItemUI.java:1020)
      at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1576)
      at javax.swing.JComponent.processKeyBinding(JComponent.java:2772)
      at javax.swing.JMenuBar.processBindingForKeyStrokeRecursive(JMenuBar.java:656)
      at javax.swing.JMenuBar.processBindingForKeyStrokeRecursive(JMenuBar.java:664)
      at javax.swing.JMenuBar.processBindingForKeyStrokeRecursive(JMenuBar.java:664)
      at javax.swing.JMenuBar.processKeyBinding(JMenuBar.java:640)
      at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:255)
      at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:242)
      at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2849)
      at javax.swing.JComponent.processKeyBindings(JComponent.java:2841)
      at javax.swing.JComponent.processKeyEvent(JComponent.java:2735)
      at java.awt.Component.processEvent(Component.java:5360)
      at java.awt.Container.processEvent(Container.java:2010)
      at java.awt.Component.dispatchEventImpl(Component.java:4050)
      at java.awt.Container.dispatchEventImpl(Container.java:2068)
      at java.awt.Component.dispatchEvent(Component.java:3885)
      at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1826)
      at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:681)
      at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:938)
      at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:810)
      at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:645)
      at java.awt.Component.dispatchEventImpl(Component.java:3923)
      at java.awt.Container.dispatchEventImpl(Container.java:2068)
      at java.awt.Window.dispatchEventImpl(Window.java:1791)
      at java.awt.Component.dispatchEvent(Component.java:3885)
      at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
      at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
      at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

This started popping up  after i added 3 else statements in addition to the original 5.

any ideas.... should i even be concerned?

I was looking to change the status of multiple pins with a single digitalWrite.  I'll read up on bitmask operations and adjust my code accordingly.

Thanks for the push in the right direction.