On Dr. Monk's library page here, he states: "You can attach up to 10 events to a timer." I am wondering if this is a hardware limit, or if it was an arbitrary number he chose for his library.

In Timer.h, he defines the maximum number of timed events like this:


Can you foresee any problems if I changed that to a higher number? My sketch is already approaching the limit of 10 timed events running at the same time, so it would help me if I was able to increase the maximum number of timed events to about 20.

1 Answer 1


I don't see anything that would cause any issue. Just don't exceed 255.

  • Thanks! I'll mark this as the answer if I don't notice any problems by tomorrow. I wonder why he would choose such a low arbitrary number. Even the forked updated versions on github keep the 10 limit.
    – Jerry
    Dec 18, 2015 at 0:00
  • 1
    This is due to memory. The library creates 10 Event objects and stores them in an array. That is at least 11 bytes per object.
    – Gerben
    Dec 18, 2015 at 13:33

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