Does a LED light up when connected to digital pin 0 ( and also ground ) ?

Normally, does a LED light up when connected to digital pin 0 ( and also ground ) ?

Is the pin fried ?

Does that mean I cant do anything on that pin?

Please reply!!!!!!!!!!!!

Digital Pin 0 is the Serial Receive pin. If you don't need the hardware serial port (Serial.begin(baudrate)) you can use it as a data pin.

(Digital Pin 1 is the Serial Transmit pin.)

But is it normally high?

But is it normally high?

It is normally an input. Have you done anything to change this (in your code, which you haven't posted. Hint)

Did you remember a current-limiting resistor?

http://arduino.cc/forum/index.php/topic,65617.0.html Cross-posting makes me cross.

If the LED is really sensitive if may appear to be lit up on an input pin that is floating. If the internal pullup is enabled, then even more so. Don't forge the current limiting resister or it may (or will, more likely) be fried when you output a 1 to that pin.

Normally, does a LED light up when connected to digital pin 0 ( and also ground ) ?

Yes it will (if it's a high efficiency led) but only because of a unique property of pin 0. The on board USB serial converter chip 'pulls' this signal high (+5vdc) through a 1k series resistor if there is no serial data being sent to pin 0, so wiring a led from pin 0 to ground will allow a small amount of current to flow through the led. Other arduino pins don't have the property as default. However if you program a input pin to enable it's internal pull-up then there is also the possibility of seeing what with a very efficient led wired between the input pin and ground.

Lefty