I just bought the Rpi 4 for wonderful pyspectrometer project.

Unfortunately my Rpi4 cannot boot itself with recommended 2021-01-11-raspios-buster-armhf. The Legacy and 2021-03-04-raspios-buster does not allow to install scipy. The computer gets unrensponsive so I have to make a hard reset.

Any help would be very appreciated!

Regards Andrzej

Dear Les,

this is a great project. Thank you for sharing! I found it via hackaday.

I am thinking about if I could use it for astronomy. Because the light sources (stars) are very dim, a long time exposure would be needed. Is there an advantage if the HQ Pi Cam is used instead of the Standard Pi cam for this case?

I just leave my thought for a long time exposure here for discussion. I more people are interested, maybe someone could implement it. Otherwise just close this ticket.

Keep up the great work :)

I suggest adding some sort of averaging from several frames, so that sensor noise doesn't get captured as legitimate spectrum data. Ideally, user should be able to toggle this function on/off as necessary.

I have not looked at the code too much yet, only at a glance. Besides python is not my number one language, but I am willing to help you add something that does the averaging.

Also, if you accept it, I saw some room for improvement with the code.

Me: US based software engineer by trade.

ps: averaging can be done by grabbing data from several rows above and below the "main scan line", instead of waiting for several frames to accumulate.

This project currently can't be cloned onto a Windows machine due to the colons in the filename of this image: media/spectrum-09-04-2021-15:19:27.jpg

Renaming the file to something like spectrum-09-04-2021-15-19-27.jpg will solve this issue.

Hello!

I found link to this project from https://hackaday.com/2021/04/23/pi-based-spectrometer-puts-the-complexity-in-the-software/

Could you please add information about license of this repository — is it allowed to copy, change and use the code and images in any purpose? It would be great to see any popular open source license.

Hello leswright 1977, I am an engineer from China; I currently have a laboratory project that needs to use a spectrometer to measure the near infrared spectrum. The spectral range is 400 to 1100nm;; Check the commercial spectrometer, it is too expensive; One is about 10000 RMB; So I want to DIY myself;

I watched your YouTube video, which only supports the spectrum of 400 to 700nm; I found a spectroscope on Taobao, and found that there was only a spectroscope with the wavelength of 400 to 700nm used to identify gemstones; This can not meet my needs, so I contacted you to inquire if there is a spectrometer that can measure 400nm to 1100nm to meet my project;

My email address is [email protected] , looking forward to your reply! A friend from China

So that I can easily use my spectrometer with different computers, some of which already have other video sources.

Is the preferred way for people to submit pull requests to just change the latest "version" in the src/ directory? Having to ask you to make a new revision every time someone submits a change does seem kind of inconvenient for you (and potentially others that maintain their own customisations (for example me)). Would you perhaps be open to a pull request that unified the project history into a single src/pyspectrometer.py and instead used git's "tag" feature to represent revisions and allow folks to easily run any revision they chose?

Thanks!

Hi, great project, congratulations, could you please let me know which Raspberry Pi 4 version did you use for the project? How much memory? What is the average memory utilization when running the software?

I start with fresh image "Raspberry Pi Os with Desktop" (from 2021-03-04) and got:

pi@raspberrypi:~/PySpectrometer/src $ python3 pyspectrometer-v3.py
Traceback (most recent call last):
  File "pyspectrometer-v3.py", line 46, in <module>
    import PIL.Image, PIL.ImageTk
ModuleNotFoundError: No module named 'PIL.ImageTk'

It seems, that one dependency is missing - I had to add: sudo apt-get install python3-pil.imagetk

When installing on a zero 2 W, the scipy install dies on numpy. It's a memory issue, since you only have 300 some MB. You'll need to increase the swapfile size, at least temporarily. Alternatively install the dependencies on a full size Pi4 and transfer the folders.

also don't forget to run apt get update.

I followed the instructions at: https://pimylifeup.com/raspberry-pi-swap-file/

to save some clicks, here's the terminal commands

sudo dphys-swapfile swapoff sudo nano /etc/dphys-swapfile ctrl-w CONF_SWAPSIZE=100 ---change 100 to 1024 or 2048. I wasted enough time last night. I changed it to 2048 and it finished in about an hour. ctrl-x y sudo dphys-swapfile setup sudo dphys-swapfile swapon ----then reboot sudo reboot

Hello!

Great project! I am just having a bit of an issue with openCV and GStreamer. Any suggestions would be much appreciated

[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (1824) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Failed to allocate required memory. [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (914) open OpenCV | GStreamer warning: unable to start pipeline [ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (501) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created

Hello! this project is awasome!

I just found a c-mount CCTV lens on my local store so I made this 3D models to print the camera/spectrometer support and lens thread to use a regular (oficial) v2 raspberry pi camera.

Also I made some modifications in the README.md to acomodate some things and structure it better. I hope you don't mind. Also added an example testing a bandpass filter in front of the spectrometer.

thank you!

I have to do a lot of color measurements on different RGBW led strips. It would be awesome to automate this process. It would be great if I could trigger a measurement externally with maybe a TCP of HTTP(S) command and get the measurements back as JSON (or some other format like comma delimited CSV like). Would you please consider this?

This will allow for use on different computers and with weird USB cameras.

My USB camera is aliexpress breed, which is quite picky about resolution+fps combinations. Also as I am using notebook as a device for doing analysis, the video0 is typically internal camera.

I came across https://github.com/leswright1977/PySpectrometer/pull/13 only after introducing these changes, but approach seems to be quite compatible. I would also like to second @rafl question about code organization and suggest having just one file pyspectrometer.py and use git tags for version tracking.

Where did you buy the black piece that holds the spectroscope (its rectangular with a hole the right size for the spectroscope and with what looks like a brass screw for holding it in place)? It doesn't show it listed in the parts on the github page.