Hey kids!<br><br>So, I was taking a peek through Jameco today to see what kinds of phototransistors could be used for the DO sensor, and came across these cool dillios:<br><br><a href="https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_1872986_-1">https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_1872986_-1</a><br>
<br>Essentially, we've got an IR LED with a phototransistor all in one package. Its designed to do solid object sensing, but wouldn't it be possible to use this as our spectrophotometer? I think using this guy could solve a lot of problems - the mount is already designed, the gap spacing is well characterized, and everything already lines up. <br>
<br>Do people have experience using these kinds of things, or should I go ahead and order a couple?<br><br>Sean<br><br><div class="gmail_quote">On Tue, Apr 5, 2011 at 11:56 PM, Rikke Rasmussen <span dir="ltr"><<a href="mailto:rikke.c.rasmussen@gmail.com">rikke.c.rasmussen@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hey all,<div><br></div><div><br></div><div>Thanks for a great meeting yesterday, pleasant and very informative in spite of weekend-wear and happy KDE people at Noiseybridge!</div>
<div> </div><div>Rolf, the OP506B looks just perfect - 100% relative response at 850nm, and schematics so simple even I can follow them - brilliant! Ihave just been reading through the attached .pdf on the wonders of single-colour NIR for biomass measurements, published by one of Optek's competitors, mainly for calibration equations + curves. Also a nice basic intro to spectrometry, should anyone else be curious.<br>
<br></div><div>Charlie, thanks so much for the <a href="http://www.element14.com/community/blogs/bioboardblog" target="_blank">blog post</a> - was on my way to give a somewhat wishy-washy update, and there was this brilliant, high-level discussion of thermocouples and thermistors with pics and all! Check it out, everyone!</div>
<div><br></div><div><a href="http://www.element14.com/community/blogs/bioboardblog" target="_blank"></a>In other news, there will be both destillation and kombucha brewing and bottling to have fun with tomorrow night at Noisebridge, approx. 7pm - come hang out, help out...or both!</div>
<div><br></div><font color="#888888"><div>/Rikke</div></font><div><div></div><div class="h5"><div><br></div><div><br><div class="gmail_quote">On Wed, Apr 6, 2011 at 12:18 AM, Rolf <span dir="ltr"><<a href="mailto:rolfvw@gmail.com" target="_blank">rolfvw@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Folks!<br>
It was good to see everyone yesterday, and get updated on what people<br>
are working on.<br>
Too bad it got so noisy at Noiseybridge!<br>
<br>
I went ahead and ordered some parts today (will expense with Rikke<br>
soon) for the<br>
pH amplifier. It's going to be quite an effort.<br>
I also will get some phototransistors for the NIR probe.<br>
<br>
I found some parts that are well matched for the 850nm IR LEDs that I brought in<br>
yesterday. It's the Optek OP506B. They cost 80 cents each.<br>
A very simple circuit is required around it, and it might even work<br>
with a couple<br>
resistors.<br>
I think the probe will require 3 wires: +5v power, signal output, and<br>
GND (hopefully shielded).<br>
<br>
If these parts work, then the mechanicals should be straightforward.<br>
The LED and the detector are both 3mm LED-like packages.<br>
This should make it easier to design a probe around it.<br>
<br>
Cheers,<br>
-rolf<br>
<br>
<br>
On Sun, Apr 3, 2011 at 1:37 AM, Rikke Rasmussen<br>
<<a href="mailto:rikke.c.rasmussen@gmail.com" target="_blank">rikke.c.rasmussen@gmail.com</a>> wrote:<br>
> Hey all,<br>
> Welcome to the Biobridge mailing list! By way of introduction, here's a<br>
> quick update on present status and future plans for the BioBridge group.<br>
> Our current project, the BioBoard, one of the entries in the Great Global<br>
> Hackerspace Challenge, is coming along really nicely. For any subscribers<br>
> unfamiliar with the project, we're basically building a bunch of different<br>
> sensors (temp., pH, dissolved oxygen, NIR spectrometer), hooking them up to<br>
> a microcontroller and transmitting the sensor data to a server somewhere<br>
> with a web app that plots a nice graph for you so you can monitor your<br>
> microbial culture in real time from the comfort of your couch.<br>
> What we've got so far:<br>
> Sensors<br>
> - thermometer: 2 different set-ups (one-wire digital thermometer,<br>
> thermistor), both functional (yay!) - Charlie's the man here<br>
> - pH: several leads, and at least two good brains chippin' away at the<br>
> problem - Rolf and Otute are the dudes on the job<br>
> - dO: solvent sandwiched in a cheap and beautiful mylar/vinyl bilayer,<br>
> catalyst to arrive on Thursday - Sean's got it down<br>
> - NIR: have a fairly decent plan for the LED/photosensor part, but need help<br>
> regarding circuitry and wiring - Rikke's fumbling with this one<br>
> Microcontroller<br>
> - Arduino board + ethernet shield have been successfully delivered to Marc<br>
> (I hope?)<br>
> - alternative suggestions have come up, we'll go through the pros and cons<br>
> of each on Monday<br>
> Software<br>
> - we've been given an Arduino sketch for above assembly<br>
> Project group meetings are on Mondays at 7:30pm at Noisebridge, (new)<br>
> deadline is March 3rd. Current plan is another 2 weeks of sensor building,<br>
> then a week of assembling and testing and a final week of fine tuning the<br>
> final product. All of this ends in a big finale at Maker Faire (where<br>
> Biobridge will hopefully also be represented at the Noisebridge table at<br>
> least some of the time), May 21st-22nd.<br>
> Once Maker Faire is over, it is my hope that we can start hosting regular<br>
> classes at Noisebridge - both theoretical (intro to general microbiology,<br>
> specific aspects of bacteriology/mycology/phycology as relevant,<br>
> biochemistry/molecular biology/genetics, ecology & evolution) and practical<br>
> (aerobic/anaerobic fermentation, bacterial/algal cultivation, mushroom<br>
> growing, selection/mutagenesis/mating group experiments, basic<br>
> transformation, whatever else we think of or find someone to teach) ...in<br>
> short, all the fun we can have with microbes. We might well use the wiki to<br>
> plan this - all input is valued!<br>
> Thoughts, ideas, comments?<br>
> /Rikke<br>
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