An Arduino project that acts as a wired remote shutter release for a Nikon DSLR.
(15) PORTJ0 = CLK out (normal high, strobe low) (14) PORTJ1 = LAT out (normal low, strobe high) (16) PORTH1 = D0 in (actuated button = low)
(17) PORTH0 = cue shutter, active low (18) PORTD3 = fire shutter, active low (19) PORTD2 = open valve, active high
(20) SDA (21) SCL