but I wonder what concentrations can be detected - accuracy / precision / ... ???
Here's a guy to ask!http://creative-technology.net/MAKE.html
The spectrometer has a “learn” mode and an “identify” mode. In the learn mode a known sample is placed in the unit and sampled at each wavelength of light emitted by the LED’s. The sampled values are stored in a database in the Arduino memory. In the identify mode an unknown sample is spectrally scanned and the software in the Arduino compares the values of the scan with the values stored in the database