Self calibrating sundial

cults3d

Here's my self-calibrating sundial gadget! It's one of my latest Arduino projects, and although it's working flawlessly, I'm still tweaking the code to get it just right. My device is equipped with two SG90 servos, a GPS receiver, and a digital compass - all connected and controlled by an Arduino nano (check out the attached schematic). The compass will position the sundial in a North-South direction, no matter where I start it. Then the GPS finds my latitude and tilts the sundial plate at that angle. Wherever I place this sundial, it'll calibrate itself - as long as it's in a sunny spot and level enough to get accurate time readings. This is an equatorial sundial with a perpendicular gnomon, and once tilted at latitude angle, it gives me solar time. Here's a video that shows how it works: https://www.youtube.com/watch?v=TAUqQ9iddgU Enjoy!