serial send and receive never works

hello,

code: [select]


#define led 3

int bytereceived;

void setup()
{ pinmode(led, output);
  serial.begin(9600);
  serial.println("--- start serial monitor send_rcve ---");

}


void loop()
{
  if (serial.available() > 0)
  {

    if (bytereceived == '1')
    {
      digitalwrite(led, high);
      serial.print(" led on ");
    }

    if (bytereceived == '0')
    {
      digitalwrite(led, low);
      serial.print(" led off");
    }

  }
}



this code simple never works.


when type 1 or 0 in serial monitor on arduino ide 1.6.3

i cannot see "led on" or "led off" on monitor

the led never lights ( digital pin 3 ---330 ohm resistor ---led(anode)--- led(cathode) ---gnd)

i have no idea issue is.

footnote: using arduino uno r3 powered usb cable on windows 7

thanks lot.

because never read serial interface

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