Another photopopper, this time using a circuit based on the Miller engine.
I was very pleased with the design and performance of this bot - it scoots along even in low light and doesn't suffer from any lockup issues that plague FLED-based designs. The motors fit perfectly in salvaged fuse clips, hot glued at angles to the main capacitor. Two more little blobs of glue on the tips of their shafts provide plenty of grip.
The potentiometer serves to fine-tune the balance between the two solar engines, so it's able to follow light really well.
Of course, without any photosensitive FLEDs, a photopopper using the Miller engine needs to include some sort of light sensor. Photodiodes are recommended, but phototransistors, IR sensors, and even IR LEDs should work. I used two PD638B6 photodiodes, which seem to work well.
