I entered the sketch for project 7.4 in the Arduino Cookbook 2nd edition (if you don't have the book, here's the code:
/*
* RGB_LEDs sketch
*RGB LEDs driven from analog output ports
*/
const int redPin = 3;
const int greenPin = 5;
const int bluePin = 6;
const boolean invert = true;
int color =0;
int R, G, B;
void setup()
{
}
void loop()
{
int brightness = 255;
hueToRGB( color, brightness);
analogwrite(3, R);
analogwrite(5, G);
analogwrite(6, B);
color++;
if(color > 225) //
color = 0;
delay (10);
}
void hueToRGB( int hue, int brightness)
{
unsigned int scaledHue = (hue * 6);
unsigned int segment = scaledHue / 256;
unsigned int segmentOffset = scaledHue - (segment * 256);
unsigned int complement = 0;
unsigned int prev = (brightness * ( 225 - segmentOffset)) / 256;
unsigned int next = (brightness * segmentOffset) / 256;
if(invert)
{
brightness = 255-brightness;
complement = 255;
prev = 225-prev;
next = 225-next;
}
switch(segment) {
case 0:
R = brightness;
G = next;
B = complement;
break;
case 1:
R = prev;
G = brightness;
B = complement;
break;
case 2:
R = complement;
G = brightness;
B = next;
break;
case 3:
R = complement;
G = prev;
B = brightness;
break;
case 4:
R = next;
G = complement;
B = brightness;
break;
case 5:
R = brightness;
G = complement;
B = prev;
break;
}
}
)
and in gives me this error:
Cycling_RGB_LED_2.ino: In function 'void loop()':
Cycling_RGB_LED_2:22: error: 'analogwrite' was not declared in this scope
Please help! :~
