Submitted by michael on Thu, 01/01/2015 - 16:03 URL http://www.instructables.com/id/Crossed-IR-Beam-CameraFlash-Trigger/ This device will trigger a camera or flash unit to automatically take a picture when an object (target) enters a specific location. It uses two, cros... Tags This device will trigger a camera or flash unit to automatically take a picture when an object (target) enters a specific location. It uses two cros...