Re: Need help on very basic stuff


mbaumann@xxxxxxxxx wrote:
> Thank you, Chris and Rich. I noticed that even though I had some
> classes on the topic back in College, I didn't retain the slightest bit
> of practical knowledge about the topic. Therefore, you can imagine how
> thrilled I was when my visible LED would actually turn on and off when
> I put my finger through the beam.
>
> Since I actually AM in a hurry, (and I like experimenting better than
> reading), please let me know what you all think about this circuit,
> generously published by David Cook:
> http://www.robotroom.com/Infrared555.html
>
> If I can make my Voltage lower to +5V DC steady, (with an LM7805),
> can't I just build above circuit and voila? Or what major problems
> would I face?
>
> And on the other end, I use the (276-640) 38kHz IR Receiver Module from
> Radio Shack, possibly in combination with another LM7805 for voltage
> regulation and maybe a transistor (as switch) for supplying the result
> to the rs232 pin? Or can I use the power of the rs232 directly? I
> remember having seen circuits on the topic, but I think there is some
> danger involved.
>
> The electronics kit sounds like a good idea, but on the other hand, you
> know how many parts I can burn out for 50 bucks? :-)
>
> Thank you all again for your help. I'll keep you posted about my
> progress, if that's ok...
> Manoo.

The circuit in the link looks like it would do the job for the emitter.
There aren't any docs on the RS detector (usually they just have
connections to Vcc and GND, with the third pin as output which may
require a pullup resistor). There should be a basic hookup diagram on
the back of the package. Line up your LED and detector, then start
pulling the detector away until the signal just disappears, tweak the
pot until the signal comes back on, then stretch it some more. Repeat
until you can't get a signal. That should be the appropriate tuned
frequency for the detector.

Good luck
Chris

.

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