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<div class="moz-cite-prefix">Yup. Agree with Shane. If you look at
the rising edge on the right hand side of the screen, that's the
rise time that the current pull up can muster. The quick pulses of
the modulation can't reach their full voltage because they're not
on long enough.</div>
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<div class="moz-cite-prefix">Kevin</div>
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<div class="moz-cite-prefix">On 10/20/20 10:02 PM, Shane Trent via
TriEmbed wrote:<br>
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<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 dir="ltr" class="gmail_attr">On Tue, Oct 20, 2020 at 8:37
PM The MacDougals via TriEmbed <<a
href="mailto:triembed@triembed.org" moz-do-not-send="true">triembed@triembed.org</a>>
wrote:<br>
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<div class="gmail-m_-8652242202530604021WordSection1">
<p class="MsoNormal">See the attached scope shot…</p>
<p class="MsoNormal">This is one mark from a SONY remote
captured by an LTR-301 IR detector.</p>
<p class="MsoNormal"><a
href="https://www.sparkfun.com/datasheets/Components/LTR-301.pdf"
target="_blank" moz-do-not-send="true">https://www.sparkfun.com/datasheets/Components/LTR-301.pdf</a></p>
<p class="MsoNormal">I have this device attached to an
Arduino Uno and am using INPUT_PULLUP (internal pullup
on the pin).</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I think that the wiggle on the scope
between the cursors is the 40kHz modulation of the
signal.</p>
<p class="MsoNormal">The cursors cover 10 wiggles and the
scope reports 4.04 kHz.</p>
<p class="MsoNormal">My question is why is this wiggle of
such small magnitude? I was expecting to see full
voltage swing.</p>
<p class="MsoNormal">Is it just this particular IR
detector? Is there something in the datasheet that
would indicate this?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">---> Paul</p>
<p class="MsoNormal"> </p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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