Inside the loop we'll perform the following: if (millis() snapshot_time + 150) Just before the looping code within which time-delayed code will run, we'll set the snapshot variable: snapshot_time = millis() We start by declaring a variable for the snapshot - it must be an unsigned long, as that's the return value for both millis() and micros(). Let's look at a real-world example from running code. By subtracting first value from current we get a value of how many milliseconds or microseconds have elapsed, and if enough time has passed, we replace the snapshot with a current value and wait for the difference to reach our desired interval value again. Second, inside the loop we check to see what the difference is from the current millis()/micros value is versus the snapshot. The way we use these for timing is twofold: first, we take a snapshot of the current millis() or micros() value just before we enter a loop. Since they simply return a number, they don't block code execution, and that means they're wonderfully useful for situations where you have a loop running and need code inside that loop to fire off on a regular interval without hanging the loop in the process like a blocking function like delay() will. These two functions return the number of milliseconds or microseconds that have elapsed since the program started running. ("I know people asked about" because I also asked, and found posts here where others have asked before me.) I'll be posting various things in various places, so hopefully I'll get the locations right, and if not, if a mod could make moves as needed that'd be lovely.įor this post, I'll throw in yet another tutorial on using millis() and micros() for timing. Since I've had success with developing an idea to preproduction prototype stage using Arduinos, I'm giving back to the community by spamming several subfora with things I've worked out through my dev process that I know people have asked about.
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