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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020>The LTR-301 is just a photo transistor. As
was said, with a 1k pullup, it will work about a foot but will not be what
you expect from a remote. It will also have soft edges due to the open
collector output and capacitance of the transistor. You could improve it
by following with a comparator with a bit of hysterisis but you still won't get
what you probably expect.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020>IR Remotes are transmitted with manchester
encoding (like PWM) on a low freqency carrier- usually 32Khz or 40
Khz- Sony is 40 Khz. This carrier allows the reciever to be narrow band
and allow it to have a lot of gain without turning into a noisy mess. What
you want is a IR Reciever module, these generally look like a photo transistor
but actually have an amplifier, bandpass filter and data slicer in them which
give a logic out- also with a pull up. Below is a link that is pretty
good. IR reciever modules are not hard to find. I have some around
here if you're in a time bind and need one today.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020>Here's the link-</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020><A
href="https://faculty-web.msoe.edu/johnsontimoj/Common/FILES/sony_sirc_protocol.pdf">https://faculty-web.msoe.edu/johnsontimoj/Common/FILES/sony_sirc_protocol.pdf</A></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=397102813-22102020></SPAN></FONT> </DIV>
<DIV> </DIV><!-- Converted from text/plain format -->
<P><FONT size=2>Regards,<BR>John M. Wettroth<BR>(984) 329-5420 (home)<BR>(919)
349-9875 (cell) </FONT></P>
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<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> TriEmbed
[mailto:triembed-bounces@triembed.org] <B>On Behalf Of </B>Shane Trent via
TriEmbed<BR><B>Sent:</B> Tuesday, October 20, 2020 10:03 PM<BR><B>To:</B> Paul
MacDougal<BR><B>Cc:</B> TriEmbed Discussion<BR><B>Subject:</B> Re: [TriEmbed] IR
remote signals<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr>You need more pull-up. Use an external 1k pull-up and you should
see the square waves.</DIV><BR>
<DIV class=gmail_quote>
<DIV class=gmail_attr dir=ltr>On Tue, Oct 20, 2020 at 8:37 PM The MacDougals via
TriEmbed <<A
href="mailto:triembed@triembed.org">triembed@triembed.org</A>>
wrote:<BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex">
<DIV lang=EN-US style="overflow-wrap: break-word">
<DIV class=gmail-m_-8652242202530604021WordSection1>
<P class=MsoNormal>See the attached scope shot…<U></U><U></U></P>
<P class=MsoNormal>This is one mark from a SONY remote captured by an LTR-301
IR detector.<U></U><U></U></P>
<P class=MsoNormal><A
href="https://www.sparkfun.com/datasheets/Components/LTR-301.pdf"
target=_blank>https://www.sparkfun.com/datasheets/Components/LTR-301.pdf</A><U></U><U></U></P>
<P class=MsoNormal>I have this device attached to an Arduino Uno and am using
INPUT_PULLUP (internal pullup on the pin).<U></U><U></U></P>
<P class=MsoNormal><U></U><U></U> </P>
<P class=MsoNormal>I think that the wiggle on the scope between the cursors is
the 40kHz modulation of the signal.<U></U><U></U></P>
<P class=MsoNormal>The cursors cover 10 wiggles and the scope reports 4.04
kHz.<U></U><U></U></P>
<P class=MsoNormal>My question is why is this wiggle of such small magnitude?
I was expecting to see full voltage swing.<U></U><U></U></P>
<P class=MsoNormal>Is it just this particular IR detector? Is there
something in the datasheet that would indicate this?<U></U><U></U></P>
<P class=MsoNormal><U></U><U></U> </P>
<P class=MsoNormal><U></U><U></U> </P>
<P class=MsoNormal>---> Paul<U></U><U></U></P>
<P
class=MsoNormal><U></U><U></U> </P></DIV></DIV>_______________________________________________<BR>Triangle,
NC Embedded Computing mailing list<BR><BR>To post message: <A
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