IR PhotoTransistor
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Posts: 46,084
I need to find what RL should be used on a Radio Shack PhotoTransistor (NOT
THE DECODER, JUST THE PhotoTransistor that comes packaged with a LED)
This could be either as a Common Cathode or Common Anode setup to use this
as a switch. If connected to P3, for instance, I would have a 1 or 0 if the
LED was passing to the PhotoTransistor or just the opposite if it were
blocked.
Barry
[noparse][[/noparse]Non-text portions of this message have been removed]
THE DECODER, JUST THE PhotoTransistor that comes packaged with a LED)
This could be either as a Common Cathode or Common Anode setup to use this
as a switch. If connected to P3, for instance, I would have a 1 or 0 if the
LED was passing to the PhotoTransistor or just the opposite if it were
blocked.
Barry
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
and higher sensitivity, use 100K. Instead of Radio Shack, you can also
use Phlmore platic fiber optic photologic detectors, without the plastic
light pipe. They are TTL/CMOS compatible.
Dennis
Original Message
From: Barry Erick [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=aLJUyvtxEX_psyohKmBFQ5EzlwKa2ZLkZd9BIw96P_uq5RlfwK-WNzY7CIaxichSd7Pm5Hk]berick@e...[/url
Sent: Tuesday, June 29, 2004 7:05 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] IR PhotoTransistor
I need to find what RL should be used on a Radio Shack PhotoTransistor
(NOT THE DECODER, JUST THE PhotoTransistor that comes packaged with a
LED)
This could be either as a Common Cathode or Common Anode setup to use
this as a switch. If connected to P3, for instance, I would have a 1 or
0 if the LED was passing to the PhotoTransistor or just the opposite if
it were blocked.
Barry
[noparse][[/noparse]Non-text portions of this message have been removed]
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sent the message last night and when it did not show, I thought maybe it was
because I did not post it from Yahoo and just my email. So I posted again.
Then I saw the first message was just stuck in my outgoing mail and was
never sent until it was too late.
It turns out my 60 year old eyes misread the resistor I was using and I
picked a 1.2k instead of a 12k. That fried the phototransistor and my 60
year old mind also skipped over good old ohms law on the value. Maybe
because I am on vacation and not doing my main work that I have over 40
years in that uses ohms law daily.
Barry
>
Original Message
> From: Dennis O'Leary [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=43epQmD9j0qjps5mM9u7DTlSp9ahtBDb4nNkMPoICF30SbkxoiTl-2IVsgz4G6xrlYngCRhQf6oCKVv_EQ]doleary@e...[/url
> Sent: Wednesday, June 30, 2004 2:06 PM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] IR PhotoTransistor
>
> For faster response and lower sensitivity, use 10K. For slower response
> and higher sensitivity, use 100K. Instead of Radio Shack, you can also
> use Phlmore platic fiber optic photologic detectors, without the plastic
> light pipe. They are TTL/CMOS compatible.
>
> Dennis
>
>
Original Message
> From: Barry Erick [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=i76-l4KH0JMe2U5rGSFSyr9JesCiVpfBP55F0VNA2HNwL2ATBffj8K6KXaXqq0wSh44QgRmC]berick@e...[/url
> Sent: Tuesday, June 29, 2004 7:05 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] IR PhotoTransistor
>
>
> I need to find what RL should be used on a Radio Shack PhotoTransistor
> (NOT THE DECODER, JUST THE PhotoTransistor that comes packaged with a
> LED)
>
> This could be either as a Common Cathode or Common Anode setup to use
> this as a switch. If connected to P3, for instance, I would have a 1 or
> 0 if the LED was passing to the PhotoTransistor or just the opposite if
> it were blocked.
>
> Barry
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject
> and Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>