Arduino 2-axis servo solar tracker

Posted on Feb 6, 2014

I marked the approximate center of the base and drilled a hole large enough to screw the setscrew for the servo armature in. I then hot glued the armature to the underside of the base making sure not to get glue in the hole i drilled. I used 3 light sensors and 1 tilt sensor. You can substitute LEDs orphoto-transistors for the CDS cells, and/or me

Arduino 2-axis servo solar tracker
Click here to download the full size of the above Circuit.

rcury switches for theball bearing tilt sensor but your code will have to reflect the change(s). I soldered wires from a scrap ribbon cable to the leads of each light sensor and a 2 pin header on the opposite end to connect easily to the breadboard. Use electrical tape / heat shrink / liquid insulator on the bare parts of the wire so that they don`t short out. Once that`s done, hot glue the sensors at equal intervals around the circumference of the mirror. I placed the sensors so that the flat collecting side of the sensor was parallel with the plane of the mirror and angled out from the center just slightly. The tilt sensor that I found was a plastic box with 4 contacts running through it and a ball bearing inside. This sensor prevents the tracker from pointing at the ground and also gives the y-axis an end-stop. Solder wires onto the 4 pins of the tilt sensor then glue it on the back side of the mirror with the leads running horizontally. With the mirror pointing straight upward, the BB should be resting on the 2 middle leads.

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