Hello(sorry for the late reply)
I'm still very much interested in BEAM but haven't built one in awhile.I was too busy making joule thieves and Theremins and sometimes those two in one project.
Anyway,your Bisymet sounds interesting and I might make one myself sometime(do you have a drawing of the circuit?)
--- In firstname.lastname@example.org, "connor_ramsey@..." wrote:
> Hello? anyone out there?
> I'm working on a light seeking symet too. Shouldn't all symets be light seeking? Anyway, It's gonna be called "Bisymet", due to the fact that it's longer than it is wide, and because it can move in two directions.
> It doesn't ACTUALLY have any dedicated light sensors, but it uses a zener diode to measure the average voltage output of the solar panel, and if the voltage is too low, the transistor coupling switches state, reversing the motor's direction on the next solar engine cycle. So basically, Bisymet will keep moving forward until the light gets too dim, indicating it has moved away from the light source, it reverses its direction until it migrates back into it's "comfort zone". Otherwise, Bisymet will simply bump its way out of any encounter with an obstacle, like a normal symet. Although I intend to off-center the motor shaft to create a more interesting exploration behavior. Again I think that should be standard among symets.
> Concerning that FLED walker i mentioned earlier, the rear FLEDs can simply double as light sensors to bias the rear motor toward light.
> The only ways I can figure to fit any obstacle avoidance are a) use the light sensing FLEDs to detect when an object is blocking ambient light on one side, but much more effectively is b) to add a potentiometer with a pair of feelers mounted, that biases the power levels supplied to the transistors on either side of the front motor driver, effectively shortening the stride on that side of the robot.
> Hope you enjoy, Connor