<div dir="ltr">Hi Daniel,<div><br></div><div>We use these around the lab: <a href="https://www.amazon.com/dp/B00IM8OD14/ref=pe_2640190_232748420_TE_item">https://www.amazon.com/dp/B00IM8OD14/ref=pe_2640190_232748420_TE_item</a>.<div><div><br></div><div>It's a small photodiode sensor board with an amp and some minimal logic. Puts out both analog (continuous) signal and thresholded level (on-board pot). Hard to beat for ~$5 assembled... You can cut the traces powering the LEDs if they cause problems with experiment, but useful for debugging..</div><div><br></div><div>best,</div><div>/jamie</div><div><br></div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Jun 20, 2018 at 10:50 AM Daniel Seshu Joyce <<a href="mailto:dsjoyce@stanford.edu">dsjoyce@stanford.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p style="margin-top:0;margin-bottom:0">Hi all,</p>
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<p style="margin-top:0;margin-bottom:0">I am looking to build a simple light sensor to detect transitions between stimuli of different intensities. This will be recorded by an EEG channel and used to segment the EEG data based on the <span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols;font-size:16px">timing
of the</span> stimulus transitions. I would be grateful if you could point me in the direction of any resources/schematics that you have used with success - <span style="font-size:12pt">I recall there may have been some discussion on this topic on cvnet/visionlist some
years ago, and maybe even a tutorial paper mentioned.</span></p>
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<p style="margin-top:0;margin-bottom:0"><span style="font-size:12pt">Many thanks,</span></p>
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<p style="margin-top:0;margin-bottom:0">Daniel</p>
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<font size="2" style="font-family:Calibri,sans-serif,serif,EmojiFont"><span style="font-size:11pt"><font size="2" color="#8C1515"><span style="font-size:10pt"><b>Daniel S. Joyce, </b></span></font><font size="2" color="#8C1515"><span style="font-size:10pt"><b>PhD</b></span></font></span></font></div>
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<font size="2" style="font-family:Calibri,sans-serif,serif,EmojiFont"><span style="font-size:11pt"><font size="2" color="#4D4F53"><span style="font-size:10pt">Postdoctoral Research Fellow</span></font></span></font></div>
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<font size="2" style="font-family:Calibri,sans-serif,serif,EmojiFont"><span style="font-size:11pt"><font size="2" color="#4D4F53"><span style="font-size:10pt">VA Palo Alto Health Care System & </span></font><font size="2" color="#4D4F53"><span style="font-size:10pt">Department
of Psychiatry and Behavioral Sciences</span></font><font size="2" color="#4D4F53"><span style="font-size:10pt"> | School of Medicine | Stanford University | <a href="mailto:dsjoyce@stanford.edu" target="_blank">dsjoyce@stanford.edu</a></span></font><font size="2" color="#494A4C"><span style="font-size:10pt"></span></font></span></font></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div style="font-size:12.8px"><div style="font-size:12.8px"><span style="font-size:12.8px">James Mazer</span><br></div><div style="font-size:12.8px"><span style="font-size:12.8px"> Department of Cell Biology & Neuroscience</span><br></div><div style="font-size:12.8px"><span style="font-size:12.8px"> Montana State University, Bozeman, MT</span></div><div style="font-size:12.8px"><span style="font-size:12.8px"> <a href="mailto:james.mazer@montana.edu" target="_blank">james.mazer@montana.edu</a> 406-994-5947</span></div><div style="font-size:12.8px"><span style="font-size:12.8px"> </span><span style="font-size:12.8px"><a href="http://kernel.montana.edu/" target="_blank">http://kernel.montana.edu</a></span></div></div></div></div></div></div></div></div>