arduino single signal digital

Can this help?

#define SIGNAL1_PIN  5
#define SIGNAL2_PIN  8
#define SIGNAL1_PULSE_LENGTH_MS 2000
#define SIGNAL2_START_DELAY_MS 500 

void setup() {
pinMode(SIGNAL1_PIN, OUTPUT);
pinMode(SIGNAL2_PIN, OUTPUT);
digitalWrite(SIGNAL1_PIN, HIGH);
digitalWrite(SIGNAL2_PIN, HIGH);
}

void pulseS1LowS2() {
digitalWrite(SIGNAL1_PIN, LOW);
delay(SIGNAL2_START_DELAY_MS);
digitalWrite(SIGNAL2_PIN, LOW);
delay(SIGNAL1_PULSE_LENGTH_MS - SIGNAL2_START_DELAY_MS);
digitalWrite(SIGNAL1_PIN, HIGH);
}

void loop() {
  // call pulseS1LowS2() when needed
}

Can this help?

#define SIGNAL1_PIN  5
#define SIGNAL2_PIN  8
#define SIGNAL1_PULSE_LENGTH_MS 2000
#define SIGNAL2_START_DELAY_MS 500 

void setup() {
pinMode(SIGNAL1_PIN, OUTPUT);
pinMode(SIGNAL2_PIN, OUTPUT);
digitalWrite(SIGNAL1_PIN, HIGH);
digitalWrite(SIGNAL2_PIN, HIGH);
}

void pulseS1LowS2() {
digitalWrite(SIGNAL1_PIN, LOW);
delay(SIGNAL2_START_DELAY_MS);
digitalWrite(SIGNAL2_PIN, LOW);
delay(SIGNAL1_PULSE_LENGTH_MS - SIGNAL2_START_DELAY_MS);
digitalWrite(SIGNAL1_PIN, HIGH);
}

void loop() {
  // call pulseS1LowS2() when needed
}

delay is not suitable because it slows down the code and I have a lot of it. Here's an example I don't know how to fix it.

unsigned long currentMillis = millis();

unsigned long currentMillis2 = millis();

// These variables store the flash pattern

// and the current state of the LED

int ledPin =  13;

int ledPin2 =  12;// the number of the LED pin

int ledState = LOW;

int ledState2 = LOW; // ledState used to set the LED

unsigned long previousMillis = 0;

unsigned long previousMillis2 = 0;// will store last time LED was updated

long OnTime = 100;

long OnTime2 = 50;// milliseconds of on-time

long OffTime = 7000;

long OffTime2 = 5000;// milliseconds of off-time

void setup()

{

  // set the digital pin as output:

  pinMode(ledPin, OUTPUT);

  pinMode(ledPin2, OUTPUT);     

}

void loop()

{

  // check to see if it's time to change the state of the LED

  unsigned long currentMillis = millis();

  unsigned long currentMillis2 = millis();

  if((ledState == LOW) && (currentMillis - previousMillis >= OnTime))

  {

    ledState = HIGH;  // Turn it off

    previousMillis = currentMillis;  // Remember the time

    digitalWrite(ledPin, ledState);  // Update the actual LED

  }

  else if ((ledState == HIGH) && (currentMillis - previousMillis >= OffTime))

  {

    ledState = HIGH;  // turn it on

    previousMillis = currentMillis;   // Remember the time

    digitalWrite(ledPin, ledState);    // Update the actual LED

  }

// second signal

  if((ledState2 == LOW) && (currentMillis2 - previousMillis2 >= OnTime2))

  {

    ledState2 = HIGH;  // Turn it off

    previousMillis2 = currentMillis2;  // Remember the time

    digitalWrite(ledPin2, ledState2);  // Update the actual LED

  }

  else if ((ledState2 == HIGH) && (currentMillis2 - previousMillis2 >= OffTime2))

  {

    ledState2 = LOW;  // turn it on

    previousMillis2 = currentMillis2;   // Remember the time

    digitalWrite(ledPin2, ledState2);    // Update the actual LED

  }

}

ok i will try

thank you very much

I'm glad you've solved!

if later you need to do things while waiting to change state, then instead of using blocking delays you can use timers or any library for no-blocking delays:

GitHub - contrem/arduino-timer: Non-blocking library for delaying function calls

or

How to code Timers and Delays in Arduino (forward.com.au)