LED timer code

Other Hardware LEDs and Multiplexing
1

I am trying to find a code I can use with my arduino uno that will turn off a blinking LED after 15 minutes. The blink rate would be 1000ms on, then 2000ms off. I am pretty new to arduino's and really green at code. Thanks for any help you can offer.

2

We can help you come up with something.
Please show us what you have attempted so far.

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3

Here is the mills() I found to control the LED. I just don't know how to create a 15 minute timer that will shut off the flashing LED.
Thanks for the help!

// These variables store the flash pattern
// and the current state of the LED

int ledPin = 13; // the number of the LED pin
int ledState = LOW; // ledState used to set the LED
unsigned long previousMillis = 0; // will store last time LED was updated
long OnTime = 250; // milliseconds of on-time
long OffTime = 750; // milliseconds of off-time

void setup()
{
// set the digital pin as output:
pinMode(ledPin, OUTPUT);
}

void loop()
{
// check to see if it's time to change the state of the LED
unsigned long currentMillis = millis();

if((ledState == HIGH) && (currentMillis - previousMillis >= OnTime))
{
ledState = LOW; // Turn it off
previousMillis = currentMillis; // Remember the time
digitalWrite(ledPin, ledState); // Update the actual LED
}
else if ((ledState == LOW) && (currentMillis - previousMillis >= OffTime))
{
ledState = HIGH; // turn it on
previousMillis = currentMillis; // Remember the time
digitalWrite(ledPin, ledState); // Update the actual LED
}
}

4

15 minutes is:
my15MinuteMillis = 15601000UL; // my15MinuteMillis must be "unsigned long"

Use this variable in a "if" function, when the time has expired, make a Boolean false which then prevents the led from toggling.

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5

Thanks Larry. I'll give this a shot. This is my first attempt at writing some code myself. Thanks for the guidance!

6

This is my first attempt at writing some code myself.

No time like the present.

If you run into trouble, lots of people here ready to help.

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