<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">triembed@triembed.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><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>
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