Subject:
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RE: IR outputB
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 25 Feb 1999 18:04:50 GMT
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Original-From:
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MAR ERICSON <MAR@COOPER.EDUspamless>
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Viewed:
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992 times
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I am looking at the Schematic in the HB HP right now. It looks like the 1K
resistor is connected to the visible LED.
From the schematic, it looks like you can connect a resitor and IR LED in
series to the "3-pin female header" to make your transmitter.
However, the value of your resistor...would depend on the specs of your
LED and the transistor like John said.
The transistor should drop the voltage a little, but not enough to comply
with the "maximum voltage allowable" for most IR LED's. So use a
resistor to be safe. Hmmm...or perhaps it blinks so fast that it would
not blow the LED? I don't know.
If you need more range, you need to use more current and a more powerful
IRLED. In this case, what I would do is:
Put a more powerful transistor in parrallel to the ZTX614transitor and
connect your resistor and IRLED's negative end to the new transistor
instead of the pin on the header (which connects to old one). Come to
think of it...you can just replace the ZTX614! That would be better if
you don't mind desoldering.
-----------
ericson mar
Robotics Consultant
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Thu, 25 Feb 1999, John Hatton wrote:
> The software written by Max Davies should allow transmission as well as
> receiving. The information that I have doesn't include the hardware
> layout but as far as I understand the 1K resistor in the IR transmission
> circuit on the board should allow an infrared LED to be connected
> directly to the header connection (I may be wrong so any corrections
> will be appreciated, Fred ?). I imagine that you would have to refer to
> the specifications of the IR LED and the transistor driving it to find
> out if you need to limit the current any further.
>
> John Hatton
> mailto:johnhatton@email.com
>
> >
>
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Message is in Reply To:
 | | RE: IR outputB
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| The software written by Max Davies should allow transmission as well as receiving. The information that I have doesn't include the hardware layout but as far as I understand the 1K resistor in the IR transmission circuit on the board should allow an (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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