Hi,
I'm an arduino beginner and I have a problem with lighting up a led.
I connected the led with the + side to Pin 13 and the - side to ground of the arduino.
If I connect the 3,3 v to the led instead of the Pin 13, the led working.
#define LEDPIN 13
void setup() {
pinMode(LEDPIN, OUTPUT);
}
void loop() {
digitalWrite(LEDPIN, HIGH);
}
So whats wrong?
Thanks.
Also tried the example
int ledPin = 12; // LED connected to digital pin 13
void setup()
{
pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop()
{
digitalWrite(ledPin, HIGH); // sets the LED on
delay(1000); // waits for a second
digitalWrite(ledPin, LOW); // sets the LED off
delay(1000); // waits for a second
}
same result, no voltage
It's working now. Maybe a cable was broken. 
mranguish:
I connected the led with the + side to Pin 13 and the - side to ground of the arduino.
You should never run a LED without a current limiting resistor directly from the Arduino pins.
You will damage the LED and the Arduino.