# Is there any difference between pin 13 and the rest of the pins?

Pin 13 has a surface mounted LED on it. Aside from the fact that it makes something light up, is there any non-negligible difference between this pin and a general digital pin?

For example, if I analogWrite() on pins 12 and 13, will the output on 13 be significantly less?

• Remember that analogWrite() gives you a duty cycle not a voltage. There is no 'less'. Also, apart from the Due, most Arduinos do not support analogWrite() on pins 12 or 13. – Octopus Apr 9 '13 at 20:14