If I run this loop for 1000 times, I get a delay of approximately 1000ms or 1 second. The combination of 250 and 248 in the for loops take approximately 1millisecond of the controller’s execution time. NOTE: This is in fact the main delay code I use in my 8051 Microcontroller projects. The following is a possible code for delay that keeps the processor busy. during the execution of the delay function, Arduino cannot perform any other tasks, like reading a button for example. When the delay function with a value is called, Arduino enters into a busy state and suspends all activity until that time is finished. There seems no problem with this approach but if you observe or understand closely how delay works internally, you will get to know the disadvantage of delay. Using the delay function is simple and straightforward: mention the amount of time in milliseconds in the delay function and your microcontroller holds its operations for that period of time. It is a simple function that is associated with timing. From the day go with Arduino, delay is one of the first function you come across. You might be familiar with the delay() function in the Arduino environment. In this code, the Arduino UNO is configured to make the Digital IO pin 13 HIGH for a second and LOW for a second and this process repeats in a loop. The following code is a simple Blink Code that Blinks the LED connected to Pin 13 of Arduino UNO. How Arduino benefits by avoiding Delay?īefore I begin the Arduino Millis Tutorial, let me show a simple example circuit and code that you might be following till now.Īssume, Arduino UNO board and in that board, a user LED is connected to Digital IO pin 13.In such a case, you can use the millis() command to set each task to occur when the counter reaches a certain difference (such as blinking every 500ms and printing out every 1500ms). If, however, your task involves more “moving parts” (such as blinking the LED and periodically printing out a counter), you’ll need millis() to do that. After all, the unit doesn’t need to accomplish anything else in the time that the LED is on or off. In practical terms, while the delay() function interrupts the other processes – essentially putting everything on hold – the millis() command can establish timing without interrupting other functions, enabling a sort of “multitasking” effect.įor a very simple sketch, like making an LED blink without other functionality, the delay() command may be sufficient. The millis() command, on the other hand, bases its timing on changes in a timer that starts at 0 and continues to advance, unrelated to other activities, then pauses and begins again. Simply put, the primary difference is that the delay() command regulates the timing of an activity (such as blinking an LED) by temporarily suspending nearly all of the Arduino’s functions for a specified amount of time. The differences, however, are what make the millis() command really shine. You can use both delay() and millis() commands to regulate the timing of operations. Here, we’ll clarify the difference and examine how to start using the Arduino millis() command effectively. Despite sharing some superficial commonalities, these two commands are quite different and useful for different kinds of applications.
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