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The newer smaller CCD-pcb
06/02/2016 at 13:16 • 0 commentsBeing annoyed with myself that I'd made a PCB for the TCD1304 way larger than needed, I made a new SMD-version. It's slightly more than half the size of the original. I also did my best to keep the analog output away from the digital driving signals, and here is the result:
Because of the re-routing the pin-out on the 10-pin connector is changed:
With the new layout I was hoping to see an improvement in the noise-level, however if there's any improvement, I'm not able to see it. I also see no difference in noise whether or not I feed it 4V from a ultra low noise PSU, or directly from the nucleo's +5V. However I've not tried any very long integrations, so I cannot verify that 5V is as good as 4V.
And of course: Here's an example of a reading of the CCD:
It's a ruler. You can see the twenty nine 1mm marks and that there are two lightsources in the room it was made in.
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It's alive!
02/24/2016 at 10:38 • 0 commentsThe firmware for the STM32F401RE is complete.
The GUI is working and it's possible to set integration time and collect data on the fly. The data is written to file and so is the plotted spectrum.
Some features are still not implemented, more specifically:
- Peak detection
- Everything about the baseline
- Recording multiple exposures, incl. averaging
- File handling - open, export.
- Zoom