Pin 0 on Arduino UNO board won't stay LOW

i'm using uno board , trying set pin 0 low. briefly flickers low reverts being high , sticks there. have nothing connected 0. missing?   :~

i expecting pin 0 stay low after sending "x" in serial monitor. loop keeps sending count, know code isn't frozen.

my code:

code: [select]


const int pin0 = 0;

int cntr = 0;

void setup() {
  pinmode(pin0, output);
  digitalwrite(pin0, low);
 
  serial.begin(9600);
  delay(2);
  serial.println("x start\n");
  while (serial.read() <= 0) {}
  delay(400);
}

void loop() {
    serial.println(string(cntr));
    digitalwrite(pin0, low);
    delay(1000);
    digitalwrite(pin0, high);
    delay(1000);
    cntr += 1;
}


quote from: nelsonhoover on jun 02, 2014, 05:51 am

i have nothing connected 0.

oh do.  serial.  can use pin 0 i/o.  or can use pin 0 serial.  cannot both.

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