Based on the project in our book "Junkbots...", it's been re-featured in Make Magazine Volume 28 as a DIY article!
Make Magazine does great projects, and Volume 28 features a construction article on building your own Solar Pendulum, which has roots in the Magbot Pendulum project in the book Junkbots, Bugbots, and Bots on Wheels and defunct Solar Pendulum kit.
Use the Make article (not included - get a copy!) and this parts bundle to construct your own solar-powered, self-activating pendulum, at a 20% saving over buying the parts individually.
This particular build was developed by Owen Tanner - good job!
1x Mag1 Neodymium magnet, 25x3mm
1x double-sided sticky tape (for mounting the magnet)
1x Red LED
1x CMH Coil
2x SC2422 Solar cells
1x 3300µF capacitor
1x 1000µF capacitor
1x 2N3904 transistor
1x 2N3906 transistor
2x 100k resistors
1x 1N914 diode