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Library to send appropriate pulses to an IR LED to trigger Nikon cameras
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"TimedAction is a library for the Arduino. It is created to help hide the mechanics of how to implement Protothreading and general millis() timing. It is sutied for those actions that needs to happen approximately every x milliseconds." Aha.
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"This library is a collection of routines for configuring the 16 bit hardware timer called Timer1 on the ATmega168/328." (Timers look hard).