AnalogWrite LED problems MAX/MSP to Arduino.

i have 3 leds, (red/green/blue)
each led connected  pin (9, 10 & 11 in case.) on arduino.
i have 3 faders in max/msp,
each fader outputs value between (0-255)
i understand in order control each of leds,
i can send data via serial object in max.
no problems far,  have managed send value (0-255) fader single pin (led) using analogwrite.
my problem want write each pin separately & independently.
how can arduino recognize pin sending (0-255) value for?

i think may have send data in max/msp in format..
r255
g255
b255 (or number 0-255)

i need pointed in right direction this.
thanks in advance.

code far..

int outputpinr = 9 ;
int outputping = 10 ;
int outputpinb = 11 ;
int val;

void setup()
{
 serial.begin(19200);

 pinmode(outputpinr, output);
 pinmode(outputping, output);
 pinmode(outputpinb, output);
 digitalwrite(outputpinr, high);
 digitalwrite(outputping, high);
 digitalwrite(outputpinb, high);
 delay(5000);
 digitalwrite(outputpinr, low);
 digitalwrite(outputping, low);
 digitalwrite(outputpinb, low);
 // test leds working
}

void loop()
{ if (serial.available())
{
   val = serial.read();
   { analogwrite(outputpinr, val);}
 // bit recognizes 0-255 fader value max
}
}

maybe send 3 bytes 1 after other, first bye red value, green value , blue value.
you must indicate beginning of "color message", suggest:
use values 0..254 colors , use 255 sync if possible max...

then (untested) code might this:

code: [select]


void loop()
{
 if (serial.available())
 {
   val = serial.read();
   if(val == 255)//start or sync
   {
     //now read 3 values (rgb), each in range 0..254
     while(!serial.available()){};
     analogwrite(outputpinr, serial.read());
     while(!serial.available()){};
     analogwrite(outputping, serial.read());
     while(!serial.available()){};
     analogwrite(outputpinb, serial.read());
   }
 }
}


Arduino Forum > Forum 2005-2010 (read only) > Software > Interfacing > AnalogWrite LED problems MAX/MSP to Arduino.

arduino