Has anyone done time lapse photography? I made an intervalometer by programming an arduino and adding an 8-pin DIP switch and a VISHAY ILD32 optocoupler. Time intervals are additive by setting the DIP switches on in intervals of 5, 15, 30, 60, 120, 240, 480, 960, and 1920 seconds. If all switches are off the default is 5 seconds. The program also takes care of a wake up and focus time before each shot. The cable shown is a 1/8in audio cable. I found an adapter online to the 2.5mm for under $2. Although not too exciting at 45 sec intervals the movie is here. All images were shot with a Canon T1i in the smaller frame format and assembled using Picasa into the mpg file.