Code for the GUI is available at https://github.com/DanielJamesEvans/spectrophotometer_code.
Here is the main menu:
![](https://cdn.hackaday.io/images/9497071566956690420.png)
It is necessary to tell the software where the spectrum is in the image. Here is the interface for this:
![](https://cdn.hackaday.io/images/626881566956700938.png)
Here is the GUI for calibration. (The process is discussed above.)
![](https://cdn.hackaday.io/images/3304951566956717582.png)
Wow, this project is gorgeous. I tried to replicate it and it gives satisfactory results. Now I would like to try to go down to 200nm.