Maybe we can help if you post code.Get instant access to the Arduino Crash Course, a 12 lesson video training curriculum that teaches the details of Arduino programming and electronics and doesn’t assume you have a PhD.You will receive email correspondence about Arduino programming, electronics, and special offers. Serial communication that appears at the RX pin is recorded, PWM ( This number represents the time (measured in milliseconds No, this is definitely not a tight loop. What have we established so far?First we’ve said the delay function decreases the tightness of a loop. If your answer is using the delay function, well, you’re kind of right. Certain things do go on while the delay () function is controlling the Atmega chip, however, because the delay function does not disable interrupts.

So it was just racing through the loop. La fonction millis() ne prend aucun paramètre et renvoie un unsigned long qui représente le nombre de millisecondes écoulées depuis la mise en tension de l’Arduino.

And if it is, we print something out. In the previous example, we had no code.
Since there’s nothing inside of the loop to execute, the time it takes to go thru the sketch is practically zilch. We’ve got four lines of code. It all depends on your application. It’s the same deal here.So this is not a tight loop. So, from the start of the loop, to the end of the loop, is that pretty quick?Yes, it’s still quite quick. We will discuss the delay function, as well as the millis() function, in the video below:This is part 2 of our millis() function mini-series. Starting with the most basic sketch, we’ve only got two functions: void setup, and void loop. Check out our “delay() Arduino Function: Tight Loops and Blocking Code” tutorial which explores the millis function even […][…] millis() function mini-series. The Arduino Reference text is licensed under a And the more familiar you are with using the millis function, to help you time events in your Arduino code, the easier it will be to incorporate other parts into your program later on. Maybe every 3 seconds you want a servo to move, or maybe every 1 minute you want to send a status update to  a web server.How do you do that? It accepts a single integer as an argument. More knowledgeable programmers usually avoid the use of delay () for timing of events longer than 10’s of milliseconds unless the Arduino sketch is very simple. On the Uno and … Still tight, still fast.Next let’s add a delay to this program using the Arduino delay() function. If your answer is using the delay function, well, you’re kind of right. The code starts fast, we do the serial print, but then we get halted right there at the delay function.The whole program comes to a standstill while we wait for this delay code to finish.When the Arduino gets to this line of code, it’s kind of like going to the grocery store. None of the code after delay can run until the delay is over, so it’s getting blocked.Blocking code is not, however, just when we use the delay() function.Let’s take our program and get rid of delay, but we’ll add a for loop. We hope you’ve enjoyed this tutorial. A well known Arduino function is delay () which pauses the program for an amount of milliseconds specified as parameter. It takes very little time, so that’s a fast, tight loop.It’s worth noting, however, that this loop is not as tight as the previous example.

If you need to check the status of a sensor every 10 millionth of a second, then a program that has three lines of code may not be tight enough, it just depends.Another point to make is that not all lines of code take the same amount of time to execute. And as you may know, void setup only runs once, and then it hands the show over to void loop.Void loop then goes through every line of code that might be inside the loop (inside these curly brackets).It executes the first line, then it executes the second, and then the third, and so on and so forth, until it gets to the bottom. (There are 1000 milliseconds in a second. Arduino - delay function - The way the delay() function works is pretty simple.


There are a thousand microseconds in a millisecond and a million microseconds in a second. And then it goes back to the top.How fast does it execute the loop? If so, then we print something else to the serial monitor window.Is this a tight loop? By submitting this form you agree to the delay() Arduino Function: Tight Loops and Blocking Code