Links: http://www.powerswitchtail.com/Pages/PowerSSRTail.aspxhttp://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1230333861/0Using an interrupt is needed to dim the AC controller. There is no other way.Okay, maybe, perhaps.Originally the ATmega8 has INT0 and INT1 as interrupt inputs.http://arduino.cc/hu/Hacking/PinMappingThe Arduino function attachInterrupt() is for those two pins.http://arduino.cc/it/Reference/AttachInterruptBut the newer ATmega168 ... ATmega328p have interrupts on almost every pin: PCINT0 ... PCINT23.http://arduino.cc/en/Hacking/Atmega168HardwareAs far as I know, those PCINT pins can also be set a pin-change-interrupt. So it should be possible. But you might have to write your own interrupt routine.I think that using this will work: http://arduino.cc/playground/Main/PcInt
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