276-137A and Current
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Hello,
I've hooked up a Radio shack 276-137A IR detector's output directory
to the stamp before, even though the output is TTL, the port blew.
This leads me to my questions. Please help.
1. If you know where I can find a data sheet on this IR detector,
please share that info, i've been looking for some time now with no
luck.
2. I know these sensors "dissipate" 3.0mA, but how much current would
its output source to the stamp? In other words, why did it blow the
port on the stamp (2sx) if the stamp is capable of sinking 25mA per
pin??? I only had four inputs on the stamp..each one was one of these
detectors, and of course only reading one at a time.
3! What I plan on doing is having four of these sensors wired to say
ports 0, 1, 2, and 3, and reading their state simoultaneously by
using "InA". Theoretically this shouldn't be a problem, however my
experience with this sensor tells me this will burn these four ports.
Please give me some feedback on this, it's very important to me, as
having this work is crucial to my project.
Thanks
I've hooked up a Radio shack 276-137A IR detector's output directory
to the stamp before, even though the output is TTL, the port blew.
This leads me to my questions. Please help.
1. If you know where I can find a data sheet on this IR detector,
please share that info, i've been looking for some time now with no
luck.
2. I know these sensors "dissipate" 3.0mA, but how much current would
its output source to the stamp? In other words, why did it blow the
port on the stamp (2sx) if the stamp is capable of sinking 25mA per
pin??? I only had four inputs on the stamp..each one was one of these
detectors, and of course only reading one at a time.
3! What I plan on doing is having four of these sensors wired to say
ports 0, 1, 2, and 3, and reading their state simoultaneously by
using "InA". Theoretically this shouldn't be a problem, however my
experience with this sensor tells me this will burn these four ports.
Please give me some feedback on this, it's very important to me, as
having this work is crucial to my project.
Thanks
Comments
Stamps and never had any trouble. The one thing you MUST do is make sure
that your pin is an INPUT. To be on the safe side, you can put a 1K resistor
between the Stamp pin and the output from the detector -- that will protect
the Stamp from programming errors.
-- Jon Williams
-- Parallax
In a message dated 1/11/02 6:35:25 PM Central Standard Time, cbielek@y...
writes:
> I've hooked up a Radio shack 276-137A IR detector's output directory
> to the stamp before, even though the output is TTL, the port blew.
> This leads me to my questions. Please help.
>
> 1. If you know where I can find a data sheet on this IR detector,
> please share that info, i've been looking for some time now with no
> luck.
>
> 2. I know these sensors "dissipate" 3.0mA, but how much current would
> its output source to the stamp? In other words, why did it blow the
> port on the stamp (2sx) if the stamp is capable of sinking 25mA per
> pin??? I only had four inputs on the stamp..each one was one of these
> detectors, and of course only reading one at a time.
>
> 3! What I plan on doing is having four of these sensors wired to say
> ports 0, 1, 2, and 3, and reading their state simoultaneously by
> using "InA". Theoretically this shouldn't be a problem, however my
> experience with this sensor tells me this will burn these four ports.
> Please give me some feedback on this, it's very important to me, as
>
[noparse][[/noparse]Non-text portions of this message have been removed]
side use your advice.
--- jonwms@a... wrote:
> You may have made a programming error. I have used
> that part with BASIC
> Stamps and never had any trouble. The one thing you
> MUST do is make sure
> that your pin is an INPUT. To be on the safe side,
> you can put a 1K resistor
> between the Stamp pin and the output from the
> detector -- that will protect
> the Stamp from programming errors.
>
> -- Jon Williams
> -- Parallax
>
>
>
> In a message dated 1/11/02 6:35:25 PM Central
> Standard Time, cbielek@y...
> writes:
>
>
> > I've hooked up a Radio shack 276-137A IR
> detector's output directory
> > to the stamp before, even though the output is
> TTL, the port blew.
> > This leads me to my questions. Please help.
> >
> > 1. If you know where I can find a data sheet on
> this IR detector,
> > please share that info, i've been looking for some
> time now with no
> > luck.
> >
> > 2. I know these sensors "dissipate" 3.0mA, but how
> much current would
> > its output source to the stamp? In other words,
> why did it blow the
> > port on the stamp (2sx) if the stamp is capable of
> sinking 25mA per
> > pin??? I only had four inputs on the stamp..each
> one was one of these
> > detectors, and of course only reading one at a
> time.
> >
> > 3! What I plan on doing is having four of these
> sensors wired to say
> > ports 0, 1, 2, and 3, and reading their state
> simoultaneously by
> > using "InA". Theoretically this shouldn't be a
> problem, however my
> > experience with this sensor tells me this will
> burn these four ports.
> > Please give me some feedback on this, it's very
> important to me, as
> >
>
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been
> removed]
>
>
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