I sometimes have problems with timing accuracy when using the millis() for timing a clock. I can run the timer alone and its fine, but in some of my projects I also use VirtualWire which evidently uses clock1, and often I have an interrupt connected to pin 2 . I know you mustnt use pins 9 or 10 fo…

what effects millis() ?

John_Smith April 22, 2014, 8:04pm 10

Thats better, thanks Bob.

Its within a second after 3 hours with all libraries and things running.

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