Alt-BEAM Archive

Message #03154



To: "'Wouter Brok'" w.j.m.brok@stud.tue.nl
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Mon, 10 May 1999 12:38:42 -0700
Subject: [alt-beam] Re: any other ideas?


Hello Wouter,

Unlike your other "useless idea" (see my reply), this one needs a little
help (grin). What you want is two voltage comparators with some hysteresis
and low pass filtering. One is used for the light and the other for the
battery voltage with the following logic on the output.

1. If the light is low and the battery is high - move
2. If the light is high or if the battery is low - stop

I am sure you can design the circuit yourself or else give a shout

regards

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----
> From: Wouter Brok [SMTP:w.j.m.brok@stud.tue.nl]
> Sent: Sunday, May 09, 1999 11:32 PM
> To: beam@corp.sgi.com
> Subject: any other ideas?
>
> Hello,
>
> For my walking solarpowered (batterycharging) phototropic robot I need a
> little circuit that does the following:
> When the input of the circuit goes high (when there is enough light to
> charge the battery) the output should be low (the robot shouldn't walk),
> but when then the input goes low again (because the light is gone) the
> output should get high as to give the robot a signal that it should start
> seeking for new light. This high output should be maintained until there
> is
> enough light again or until the battery runs out.
>
> I have a little drawing of a circuit attached (R2 could also be the
> leakage-resistance of the capacitor), which I made up, but I was wondering
> if anybody (you maybe, Wilf) had another, better idea?
>
> Thanks already
>
> Wouter Brok
> << File: Idea2.GIF >>

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