We’re past the winter solstice and the days are getting longer, but that doesn’t mean we’re not sick of the sun setting around 5 in the afternoon. There is a way to get more sunlight through our windows – a heliostat. Lucky for us, [Gabriel] sent in his Open Source Sun Tracking / Heliostat project that can reflect sunlight through our windows all winter long.
Using mirrors to brighten up a room is an ancient practice; a few thousand years ago, heliostats went by the archaic term, “slaves.” Luckily there’s a far more elegant way of doing things nowadays – an Arduino. [Gabriel] came up with an Arduino sketch that calculates the altitude and azimuth of the sun using only latitude, longitude and time zone. [Gabriel] used this sketch to drive a pair of stepper motors and reflect sunlight through his window.
You can check out [Gabriel]’s demo of his heliostat after the break.