Categories

• Announcements
  

  Announcements regarding our community

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  M

  Does anyone can suggest compact flash card 128MB, 45x or 60x that works well and it's available to purchase on American/Japanese market?

• Colorimeter
  

  Forum for discussing the IO Rodeo colorimeter

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  W

  @poseidon

  I don't have a change log, but this is probably something I should start doing. There are the repository commits here
  https://bitbucket.org/iorodeo/colorimeter/commits/all The new release incorporates all the changes starting at 2016-09-04

• Rodeostat
  

  Forum for discussing the new open source potentiostat shield

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  W

  @marilia

  We don't have DPV implemented yet. However, we did just add squarewave voltammetry (SWV). I will be putting up some documentation on the squarewave voltammetry shortly.

  I think adding DPV wouldn't be too difficult. I plan to put together some online notes showing how to implement custom tests by modifying the firmware for the teensy. You could have a look at the implementation of the squarewave test in the Rodeostat's firmware here https://bitbucket.org/iorodeo/potentiostat/src as it will be very similay. See the "firmware/libraries/potentiostat" sub-directory. The squarewave test is implemented in ps_squarewave_test.h and ps_squarewave_test.cpp.

• Cheapstat Potentiostat
  

  Forum for discussing open source potentiostats

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  M

  I could not buy some parts.
  Can some parts be replaced?
  For example, are there replacement parts for TLC2264ID?

• Electrophoresis and Gel Imaging
  

  A forum for discussing our open source gel electrophoresis, transilluminators and gel imaging equipment

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  J

  Hi Fiona,
  We have looked into UV LEDs in the past for ethidium bromide, but unfortunately they are just too expensive.
  I have not tried to do a sensitivity comparison for blue light vs. UV light for viewing ethidium bromide gels. I think that probably using a UV transilluminator will be the best option for ethidium bromide gels. We have made UV transilluminators in the past and have some instructions here: http://public.iorodeo.com/docs/uv_transilluminator/. We no longer sell the kit but maybe you can find something useful from the instructions. Otherwise, maybe you can find a supplier of inexpensive UV transilluminators.
  Sorry we could not be more helpful.
  Best,
  Jo

• Panels Display System
  

  Forum for questions about the Panels Display System

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  A

  Oh gosh, you are right! I’m sorry for the delay but I was very busy. I have never thought to rotate the LED matrix because I thought I was right with that (otherwise, if not, no LED would have turned on). Thanks very much! I also take advantage of you for another issue. I have tried to load the arena configuration on the SD card but PControl doesn’t let me do that. Have you any suggestion? It seems that the controller doesn’t communicate to the SD nevertheless at the beginning (when the controller is switch on) PControl finds and initializes the SD card. I’m sorry because of all these questions!

• Online store and Shipping
  

  A place to ask questions about our online store, inventory and shipping

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  J

  Below are some images of the green LED transilluminator we designed for a custom application using the superbright green LEDs I mentioned earlier. The enclosure is the same as the blue version, we just swap the 470 nm LED for the superbright green LED. A diffuser and green filter is placed over the LEDs as I mentioned.

  The red viewing filter that sits above the LED board is actually a thin film Roscolux #26 filter which we laser cut.
  

  Because it is thin, we have to support it. We can do this using a black frame.
  

  Let me know what you think and whether this would work for your application.

  We would be able to ship approx. a week after ordering. The lead-time would be on purchasing the LEDs from Superbright. Once we receive the LEDs we would ship 1-2 days later. The cost would be $225 for the fully assembled version with the 18V power supply. So it would be ready to use. I can send you a formal quote if you want to send me an email with your shipping info to jo@iorodeo.com.

• General Discussion
  

  A place to talk about whatever you want

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  J

  Specifically I have been developing a sensor suite for colorimetry/spectrophotometry, as well as turbidity and electrical conductivity. (and pH would be a bonus to get in there) But you guys have already created it pretty much. With all that information you could quantitatively measure species in water samples and other chemical reactions.

  I am excited to see that it works, your lead tests were a nice proof of that, but I feel that it could be expanded upon if the detector is sensitive enough, and I think AMS just released one. If you emit a wavelength that is absorbed by a certain molecule, it then emits a photon again when the electron drops back to the lower energy state. There should be a wealth of information within that space between light you emit, what is transmitted, scattered, and absorbed, and then what is emitted again by the electron dropping to the lower energy level.

  I have worked with spectrophotemeters, beer-lambert law, and the most interesting to me, flame atomic absorption spectroscopy, so I would love to discuss your devices with someone. I cant promise I would be useful, but maybe I would have some insights. My specialty is water chemistry but I love all kinds of chemistry and physics. I would love to talk about any of this, including your potentiostats, which are brilliant. They would allow creation of absolutely efficient plug flow reactors with real time monitoring, making them extremely useful. My thought is they only need to be marketed to the right people.

  Anyways, thank you for reading at least, and I hope to hear back from you.

  -Jon

• Shields & Breakout Boards
  

  Forum for discussing the IO Rodeo colorimeter

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  W

  @fscker

  It looks like the RTL8195 has 3.3V IO. The potentiostat shield powers the MCP4261 with 5V. So you are connecting a 3.3V device to a 5V device - I think. I'm not sure if the IO pins on the RTL8195 are 5V tolerant, but you might want to check. Could be related to you issue.

  Note, the MCP4261's could be powered off of 3.3V. They have a pretty broad allowed input range 2.7 - 5.5V. This would require cutting one trace - the one going to the 5.5V on the shield - and rerouting this trace to to the 3.3V pin.

  The spec sheet for the MCP4261 can be found here. http://ww1.microchip.com/downloads/en/DeviceDoc/22059b.pdf