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  • Yes, your are right! That's also the way I decided to go. Though, I tried to achieved this to have a more convenient implementation of the library: This if(ready==true) could theoretically be somewhere in loop(). But my periodically checking is VERY time-sensitive. If I call the function to check in the if(), I have to be sure, that there is no delay which alters the result. Commented Sep 12, 2015 at 2:59
  • Now it is like: void loop() { freqdetec.checkFreq(); if (freqdetec.freqChanged()) { // do stuff } } The benefit from separating it into two calls is first, that it is more obvious what the single calls are doing, and second, I can place the checkFreq() in the beginning of the loop(), to avoid having it cluttered somewhere. Commented Sep 12, 2015 at 3:04
  • As another person answered, if it is highly time-sensitive you could use an interrupt (if this is a switch you are checking), or a timer firing periodically (if you need to test something like an analog reading). Commented Sep 12, 2015 at 3:09