Pulse Every 45 Seconds - Solid On When Button Pressed

[ec255]

Been working on a pet-project the last day and no further ahead now than I was yesterday at this time. I am very new to programming and this one is getting to me.

Looking for a way to turn on an LED on Pin 0 every 30 seconds for 2 seconds, and repeat. This I have working just fine. The second part I am trying to figure out is to sense a pushbutton on Pin 2 and if active, turn the LED on for as long as the button is pressed. After releasing the button, we can go back to the 30 second on/off sequence.

I have tried so many things, I cannot seem to get it.
Anyone share some thoughts on how to do this??

Appreciate it.. Eric

[LarryD]

If this is an UNO, do not use pin D0 as it is for Serial communications.

Show us your current sketch.

Show us your circuit schematic.

[lastchancename]

First things first…. do not use delay() in your code.

You need the program to be aware of the button at all times. delay() will block that.

[runaway_pancake]

Pulse Every 45 Seconds
vs.

@ec255

Looking for a way to turn on an LED on Pin 0 every 30 seconds for 2 seconds, and repeat.

[6v6gt]

@ec255

to sense a pushbutton on Pin 2

The choice of pin 2 (Uno) could imply that this exercise was intended to demonstrate interrupt handling.

[johnwasser]

const byte LEDPin = 0;  // It's OK to use Pin 0 if you don't use Serial
const byte ButtonPin = 2;

const unsigned long BlinkInterval = 30000; // Thirty Seconds
const unsigned long BlinkLength = 2000; // Two Seconds

unsigned long StartOfInterval;

void setup()
{
  digitalWrite(LEDPin, LOW);
  pinMode(LEDPin, OUTPUT);
  pinMode(ButtonPin, INPUT_PULLUP); // Button from Pin to Gnd, LOW = pressed

  StartOfInterval = millis();
}

void loop()
{
  unsigned long currentMillis = millis();

  unsigned long elapsedMillis = currentMillis - StartOfInterval;

  if (elapsedMillis >= BlinkInterval)
  {
    StartOfInterval = currentMillis;
    elapsedMillis = 0;
  }

  if ((elapsedMillis < BlinkLength) || (digitalRead(ButtonPin) == LOW))
    digitalWrite(LEDPin, HIGH);  // LED On
  else
    digitalWrite(LEDPin, LOW);  // LED Off
}