This bot, despite having no sensors, avoids shadows and stays in the warm sunlight.
I used no complicated electronics in this build - but you could improve it by adding a photo-popper circuit.
How it works
The trick is simple: Left solar cell powers right motor, and vice versa.
Here's an illustration of the movement:
Here's also a very old video of it:
- Solar cells in series (2 per motor - the more, the better)
- Two motors from CD-ROM drives (or any other)
- A piece aluminium, aluminium foil for the chassis, some plastic to encase the cells.
Here's a detail from the front:
(There used to be a rubber tubing on the axes, I must've lost it somehow)