Our space-communicationsantenna array includes a camera that looks in the direction that the array is pointing. This camera helps us check that we are aiming directly at the moon during EME attempts. In addition, when it lets us see airplanes that may be the source of interfering signals when we conduct radio-astronomy observations.
This is a hack that combines three of my favorite passions: pacemakers, photography, and coffee! I took this photograph by feeding the output of an infrared barrier to the atrium input of an old DDD pacemaker, setting an appropriate AV delay, and using the ventricular output to trigger a camera flash (via a optoisolator). In