My First Arduino Build

Forum 2005-2010 (read only) General Exhibition
1

My Arduino Duemilanove arrived in the mail today.
So I ripped it open and after the blink tutorial I made this pretty crap thing.
Makes an RGB LED display a rainbow.
This is my very first arduino build should probably read some instructions or a tutorial xD
To figure out the colour values i used this colour mixer
http://colormixers.com/mixers/cmr/
Any Suggestions on improvements would be appreciated

Video:

Code:

/*
 *RAINBOW
 *by CaptainCool
 *
 *Blinks an RGB LED through the ROYGBV colour selection
 *
 *
 */

int ledgreen = 11;
int ledblue = 12;
int ledred =  13;

void setup()   {              
 pinMode(ledred, OUTPUT);  
 pinMode(ledblue, OUTPUT);
 pinMode(ledgreen, OUTPUT);
}


void loop()                   
{
//red on
 analogWrite(ledred, 255);
 delay(1000);
//red off
 analogWrite(ledred, 0);
 delay(0);


//orange on
 analogWrite(ledred, 255);
 delay(0);
 analogWrite(ledgreen, 128);
 delay(1000);
//orange off
 analogWrite(ledred, 0);
 delay(0);
 analogWrite(ledgreen, 0);
 delay(0);


//yellow on
 analogWrite(ledred, 255);
 delay(0);
 analogWrite(ledgreen, 215);
 delay(1000);
//yellow off
 analogWrite(ledred, 0);
 delay(0);
 analogWrite(ledgreen, 0);
 delay(0);

//green on
 analogWrite(ledgreen, 255);
 delay(1000);
//green off
 analogWrite(ledgreen, 0);
 delay(0);

//blue on
 analogWrite(ledblue, 255);
 delay(1000);
//blue off
 analogWrite(ledblue, 0);
 delay(0);

//purple on
 analogWrite(ledred, 255);
 delay(0);
 analogWrite(ledblue, 255);
 delay(1000);
//purple off
 analogWrite(ledred, 0);
 delay(0);
 analogWrite(ledblue, 0);
 delay(0);


}
2

I changed all the code so it fades through the rainbow.

Video:

Here is my revised code:

/*
 *FADING RAINBOW
 *by CaptainCool
 *
 *Fades through a rainbow of colour.
 *
 */
int ledRed = 9;
int ledGreen = 10;
int ledBlue = 11;

void setup()
{
  //fade in red
  for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) { 
    analogWrite(ledRed, fadeValue);         
    delay(50);    
  }
}

void 

loop()  { 
  //fade in green
  for(int fadeValue2 = 0 ; fadeValue2 <= 255; fadeValue2 +=5) { 
    analogWrite(ledGreen, fadeValue2);           
    delay(50);                            
  }

  //fade out red
  for(int fadeValue = 255 ; fadeValue >= 0; fadeValue -=5) { 
    analogWrite(ledRed, fadeValue);            
    delay(50);                            
  }

  //fade in blue
  for(int fadeValue3 = 0 ; fadeValue3 <= 255; fadeValue3 +=5) { 
    analogWrite(ledBlue, fadeValue3);            
    delay(50);                            
  } 

  //fade out green
  for(int fadeValue2 = 255 ; fadeValue2 >= 0; fadeValue2 -=5) { 
    analogWrite(ledGreen, fadeValue2);             
    delay(50);                            
  } 

  //fade in red 
  for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) { 
    analogWrite(ledRed, fadeValue);            
    delay(50);                            
  }

  // fade out blue
  for(int fadeValue3 = 255 ; fadeValue3 >= 0; fadeValue3 -=5) { 
    analogWrite(ledBlue, fadeValue3);             
    delay(50);                            
  }
}

Any easier way i could've done this?

3

Where did you buy your arduino?

4

Looks great!

5

It doesn't look like theres any resistors on the RGB LED, which suggests the new Arduino won't last too long......

6

Where did you buy your arduino?

You can get a list of places here: Distributors — Arduino Official Store

7

This is my very first arduino build should probably read some instructions or a tutorial

Resistors are your friend. My only suggestion is keep playing with it, they're so fun!

8

I'm surprised your LEDs didn't burn out by now, without resistors and whatnot. If you're just starting out I can't blame you--everyone's blown up a few electronic components before. But you should always include current limiting resistors with an LED so that you don't fry either your arduino or your LED

9

There is a 330ohm resistor on the LED it's just near impossible to see in the second video. It wasn't there in the first one. Didn't think. xD

Where did you buy your arduino?

I got my arduino from nicegear (www.nicegear.co.nz) which is a New Zealand site because i'm from New Zealand