This is a very reliable Arduino based 2 axis solar tracker. Using small Pv panels as "optical" sensors to achieve best tracking in any weather conditions. doesn't work on ephemerides so don't need to set time and date on each power failure / reboot.Use potentiometer to set system sensivity and I've added a normal relay to automatically control a night light.Using wi-fi NRF24l01 capabilities can communicate system working conditions and parameter to a remote station.For wiring and Arduino sketch pls contact me.