Alt-BEAM Archive

Message #11924



To: beam@sgiblab.sgi.com
From: Daniel Grace lifebytes_98@yahoo.com
Date: Wed, 15 Mar 2000 16:20:03 -0800 (PST)
Subject: [alt-beam] Re: Rat Shack FLED


I got a red FLED from there not long ago. If you
overload them at all (voltage or current either one)
they STOP responding. I couldn't get the
characteristics to change in light either. Maybe it's
just me. Anyone else?

~Daniel

--- walkau wrote:
> a question:
>
> are rat shack FLEDs reliable or should they be
> avoided?
>
> thanks
> niels
>

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11925 Wed, 15 Mar 2000 17:48:09 EST [alt-beam] FRED bread boarded...problems beam@sgiblab.sgi.com "Corey Centen" Hi all, sorry to bother again,

I just bread-boarded FRED but it didn't work. The FLED would flash but the
motor would not turn. I only bread-boarded half the circuit, or one engine.
I don't know why this is. Where does the second wire of the FLED go? Any
help would be appreciated.

Also...

If I use a larger voltage than something like a 2 or 3 volt solar panel, do
I need a larger cap?

Thanks!
______________________________________________________



11926 Wed, 15 Mar 2000 17:58:00 -0800 [alt-beam] Re: IR Sensor Circuit alt-beam@eGroups.com, BEAM David Simmons Daniel,

If it isn't too much trouble I would greatly appreciate a copy of the
circuit. What I've found so far seems to be getting me no where.

Thank you,
Dave

Daniel Cotter wrote:
>
> I have added an IR sensors to a 2 motor solar roller I have. It sends
> an IR pulse for 100ms (or less) about 10 times per second. The same
> oscillator generating that pulse is used at the reciever to see if a
> pulse is returned. IR won't reflect of some surfaces well, especially
> in the sun light. There is also a another problem if you choose to use
> a reciever module because most of them need +5V fairly constantly, were
> as a photo diode is much easier to please. I found that a reciever
> module was not needed because I only wanted to recieve the infrared
> when the bot got about 30 or 40mm from an object.
>
> Also the IR signal the reciever gets is often distorted and not a
> straight pulse, so you must make sure you can use an Resistor-Capacitor
> circuit to make sure that any decent pulse for the transmitter will be
> enough to set the bot to reverse. I have a circuit for all this
> somewhere and once I find it I can send you it you it if you want.
>
> Hope some info here is helpful.
> Cya,
> Daniel
>
> david simmons wrote:
> original article:http://www.egroups.com/group/alt-beam/?start=11812
> > Hi all,
> >
> > Does anyone a simple IR crash sensor circuit, I have IR senders and IR
> > detectors that look like LEDs but don't know how to use them. Looking
> > for a simple way to backup a solar turtle with out touch sensors. Any
> > idea's would be of great assistance.
> >
> > Thx,
> > Dave
>
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