How come this constant declaration...
const unsigned long ms15 = 10006015; //milliseconds in 15 minutes.
produces this value when I print it out using Serial.println(ms15,DEC)???
ms in 15 minutes = -17504
-- Rich
Even though you are putting the result in an unsigned long type, these (10006015) are still seen as ints. Give one of them the suffix UL.
1000UL * 60*15