Hello All,<br><br>To follow up with the pH probe, I contacted Prof Goldcamp to inquire about the probe they published the paper on.<br>He said they were able to use the probe with a standard pH meter without modification - which leads me to conclude that the signal output from the probe leads must be just as in a commercial probe. This remains to be seen. The materials are on order and I should have a prototype hopefully by next week. What wasn't mentioned in the paper clearly is that a second reference electrode is needed for the whole setup to work. They used a commercial one - odd. I will try to build the reference electrode just like the main one only with a different solution. That should work :)<br>
<br>Cheers,<br><br>-O.<br><br><br><div class="gmail_quote">On Tue, Apr 5, 2011 at 5:18 PM, 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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</blockquote></div><br>