Figure B : New solarengine control circuit.

Figure C : Zeefly new design 2007.

Fig D : Flashing LED

BEAM is an acronym standing for Biology, Electronics, Aesthetics, Mechanics:

The BEAM design approach creates nimble robots from simple components, with no programming required.

Figure A : solar engine technical schematic

My new ZEEFLY solarengine will use a voltage-based activation circuit. That means the circuit watches the volts stored in the capacitor to determine when to activate.BEAM robotics is a family of electronic circuits that will let you convert the weak power output of a solar cell to drive the load of a small robot.

A solarengine stores the trickle of power from the solar cell ,and releases it in bursts of usable energy. That means you have to wait a while until the power stores up to that usable level,but at least you're getting some movement when it would be impossible without the solarengine.

( From : Junkbots,Bugbots & Bots on Wheels / Mc Graw Hill / OSBORNE )

Zeefly waiting for the solarengine .