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Blink Without Delay
Sometimes you need to blink an LED (or some other time sensitive function) at the same time as something else (like watching for a button press). That means you can't use delay(), or you'd stop everything else the program while the LED blinked. Here's some code that demonstrates how to blink the LED without using delay(). It keeps track of the last time it turned the LED on or off. Then, each time through loop() it checks if a sufficient interval has passed - if it has, it turns the LED off if it was on and vice-versa.
Circuit
Schematic:
click the image to enlarge
Code
- div class=code
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