Why does this yellow light keep blinking?

This yellow light on my labeled "L"  i/o board is constantly blinking. And I keep trying to upload "blink" but it doesn't reset and it also makes the LED blink in that pattern to.

wandersen5 years ago
change blink as follows to turn t off:

Not all of blink code:

// constants won't change. Used here to
// set pin numbers:
const int led13 = 13;
const int ledPin = 12; // the number of the LED pin

// Variables will change:
int ledState = LOW; // ledState used to set the LED
long previousMillis = 0; // will store last time LED was updated

// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long interval = 1000; // interval at which to blink (milliseconds)

void setup() {
// set the digital pin as output:
pinMode(ledPin, OUTPUT);
pinMode(led13, OUTPUT);
int ledLow = LOW ;
int ledHigh = HIGH ;

void loop()
digitalWrite( led13, ledLow) ;

wandersen5 years ago
The yellow led on you Ardruino UNO board marked with L is port 13.
transuranic (author) 6 years ago
randomly blinking along with "L"
frollard6 years ago
....the blink example code causes the io light to flash...
...uploading code causes the led to flash also...

what EXACTLY is it doing? flickering quickly, or flashing at a 1 second interval?