Art emulates nature or nature emulates art? This arduino based solar tracker would be considered a result of craft and knowledge, but it emulates nature and art beautifully. Like a sunflower, the arm in this project looks out for and tracks the sun, or the most radiant light source in an arena. It is a lovely DIY that is cheap, fun, and can be installed on your rooftop or window with good effect.
Geo Bruce, an instructable user, made a sensor of 4 LDRs with sheets between them. As can be seen in the image, the white strips are the LDRs . When the arm is pointed to the light source, the four LDRs receive the same amount of light on them. So, say, if the sun is on top-left position w.r.t. the arm, the top-left sensor gets most light and the right-top, the right-down and the left-down sensors are in the shadow.
Using this difference, a code is written on arduino to figure out the most radiant light source and then instruct the motor to point the attached arm in that direction. Simple and effective.
Filed Under: Reviews