Adding a pasue to Blink Without Delay to cycle an LED..........

Other Hardware LEDs and Multiplexing
1

Please help....

I got the following "Blink Without Delay" to work great, but I would like to add a pause in the LED flash.....for example

Flash..Flash.....pause 3 seconds.....Flash..Flash.....pause 3 seconds.....Flash..Flash.....pause 3 seconds.............

// set pin numbers:
const int conv1start =  22;      // the number of the LED pin

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

long interval = 250;           // interval at which to blink (milliseconds)

void setup() {
  // set the digital pin as output:
  pinMode(conv1start, OUTPUT);      
}

void loop()
{
   
  // blink the LED.
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > interval) {
    // save the last time you blinked the LED 
    previousMillis = currentMillis;   

    // if the LED is off turn it on and vice-versa:
    if (ledState == HIGH)
      ledState = LOW;
    else
      ledState = HIGH;

    // set the LED with the ledState of the variable:
    digitalWrite(conv1start, ledState);
  }
}
2

I suggest you have 3 or 4 "states" in a variable. Eg. "start first flash", "end first flash", "start pause", "end pause". Then cycle through each state based on time elapsed.