![]() You can put code in the myDelay function for an action that you want to happen repeatedly while the function waits for the specified time to elapse. We can customize the functionality for your application, but in this example, an LED is flashed five times per second even while the print statement in the loop is delayed for four-second intervals: This number will overflow (go back to zero) in approximately 50days.īy storing the start time for an event, you can determine the duration of the event by subtracting the start time from the current time, as shown here: Long duration = millis() – startTime The millis function returns the number of milliseconds since the current sketch started running. We want to know how much time has elapsed since an event happened for example, how long a switch has been held down.Īrduino has a function named millis (short for milliseconds) that is used in the following sketch to print how long a button was pressed. ![]() delayMicroseconds will pause from one microsecond to around 16 milliseconds, but for delays longer than a few thousand microseconds you should use delay instead: delayMicroseconds(10) //delay for a 10 microsecondsĭelay and delayMicroseconds will delay for at least the amount of time given as the parameter, but they could delay a little longer if interrupts occur within the delay time. There are 1,000 microseconds in one millisecond, and 1 million microseconds in one second. You can use delayMicroseconds to delay short periods. The delay function pauses the execution of your sketch for the duration of the delay. The delay function has a range from one one-thousandth of a second to around 25 days (just less than 50 days if using an unsigned long variable type). The sketch that shows how we can use the delay to get almost any interval. ![]() delay pauses a sketch for the number of milliseconds specified as a parameter (there are 1,000 milliseconds in one second). The Arduino delay function is used in many sketches, as we have seen. This may be some number of milliseconds or time given in seconds, minutes, hours, or days. We want our sketch to pause for some period of time. ![]()
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