Show your support for community science. Donate to Public Lab »


Comments

Author Comment Last activity Moderation
JSummers "Hi jfalquet, I dont have experience with this but it looks like getting out to 13 microns is neither easy nor cheap. Here are some options for a d..." | Read more » 23 days ago
JSummers "Hi @super_smartaga, Your question will get better answers if you can answer some initial questions. What do you consider cheap? What wavelength ra..." | Read more » 4 months ago
JSummers "Hi Wln213, Interesting project. First thing, when you do technical writing like this, please describe the figures in greater detail. The main figu..." | Read more » 4 months ago
JSummers "I believe the yellow color you see when burning wood or paper is the atomic emission from sodium ions in the material. It is the same color you se..." | Read more » 6 months ago
JSummers " You could get a local lab to test for metals using atomic absorption or atomic emission. You would have to look up the best technique for the met..." | Read more » 8 months ago
JSummers " Getting the solar spectrum was a good idea. Clearly, the lines in this are not due to the light source and must be attributed to the detector. O..." | Read more » 8 months ago
JSummers "You may be able to do this using the GPS on your phone with an app like Strava. I think the Z direction accuracy of GPS is not as good as the XY a..." | Read more » 8 months ago
JSummers " I think what you want will be called a barometer. It is what drones use to measure altitude. They are not super expensive, here is one for $6.70..." | Read more » 8 months ago
JSummers "How would this differ from wiki pages? Seems to me that the difficulty with wiki pages is keeping them up to date. That appears to be the problem ..." | Read more » 8 months ago
JSummers " @oskarbob, the drivers must be downloaded from texas instruments. You can get them from http://www.ti.com/tool/STELLARIS_ICDI_DRIVERS. Instructi..." | Read more » 9 months ago
JSummers "Lehninger, Principles of Biochemistry, Fourth Edition, David L. Nelson and Michael, M. Cox. WHFreeman & Co, NY. Chapter 6, Sections 6.3 (Enzyme..." | Read more » about 1 year ago
JSummers " Hi Ag8n, Thanks for your interest. No, we are not headed toward chromatography although the flow cell & spectrometer are pretty well set up fo..." | Read more » about 1 year ago
JSummers " Hi Ag8n, Thanks for the comment. I am glad you are interested. We just connected the VBAT pin to the +3.3 volt bus. You did not miss any descrip..." | Read more » about 1 year ago
JSummers "Hi @iresal, The correct integration time is the 15 ms time. I think that is the minimum time to read the data from the output pin. The 4 ms value ..." | Read more » over 1 year ago
JSummers "Hi @iresal, you are correct about the clock roll value being related to the integration time. As the code is written, the integration time equals ..." | Read more » over 1 year ago
JSummers "You can get gratings from places like Thor Labs or Edmond Optics. For a uv lamp, I would look at Thor labs or spectrometer vendors like Ocean Opti..." | Read more » over 1 year ago
JSummers "Hi @ONECore and @hmx, I just posted a research note on this topic. it is here: https://publiclab.org/notes/JSummers/06-03-2018/updating-the-wheet..." | Read more » over 1 year ago
JSummers "Anyone interested in this project? I am working on code to use the Toshiba TCD1304 ccd in this project. I hope to have this to a point where I c..." | Read more » over 1 year ago
JSummers "Nice project. This spectrometer could fit into an open-source chemical kinetics project I am working on. If you would be interested in collaborati..." | Read more » almost 2 years ago
JSummers "Hi @MarcioPamplona, Step one is to figure out where the absorbance shows up. By that I mean the wavelength that you need to detect. Googling "woo..." | Read more » almost 2 years ago
JSummers "Hi @Greg_H, If the altSPI files are not on your usb memory you can download them here: https://github.com/SmokyMountainScientific/altSPI There sho..." | Read more » about 2 years ago
JSummers "Hi @Greg_H, I am sorry that you are still having trouble with your WheeStat. While it is possible that it is a software problem, it seems more like..." | Read more » about 2 years ago
JSummers "Building a spectrometer is a fine university project, but this will not work for detecting fentanyl. Fentanyl does not absorb in the range where t..." | Read more » about 2 years ago
JSummers "Hi @nyck31, The short answer to your question is no. The spectrometer will measure light in the visible and perhaps short IR wavelengths. Fentay..." | Read more » about 2 years ago