December 4, 2022 Arduino

Non-Blocking Delays

Using delay() function

void loop()
 {
  int button_state = digitalRead(button_pin);
  if(button_state == HIGH) {
    digitalWrite(led_pin,HIGH);
  } else {
    digitalWrite(led_pin,LOW);
  }
  delay(1000);
}

Without delay() function. Using non-blocking delays

static int last_time = millis();
void loop()
 {
  int current_time = millis();
   
  int button_state = digitalRead(button_pin);
   
  // This is the "delay" block, runs until 1 
  // second elapsed since the previous time it ran.
  // The code in this section is equivalent to the 
  // delay() code above.
  if(current_time - last_time >= 1000){
    if(button_state == HIGH){
      digitalWrite(led1_pin, HIGH);
    }else{
      digitalWrite(led1_pin, LOW);
    }
    last_time = current_time;
  }
   
  if(button_state == HIGH){
    digitalWrite(led2_pin, HIGH);
  }else{
    digitalWrite(led2_pin, LOW);
  }
}