Yoctopuce modules: Spectrometer

In the introduction to this series of post, I described the Yoctopuce library and told that R package ‘reticulate’ can be used to access the Python version of the yoctopuce library. Here I describe a simple and cheap “micro” spectrometer with a digital interface and its use together with R packages from the 'r4photobiology' suite.

I will use a miniature and low cost spectrometer, type AS7265X from ams. It does not used a grating as monochromator, but instead each of the 18 channels has a different interference filter deposited directly on the silicon chip. The FWHM is 20 nm, and the wavelength range from 410 nm to 940 nm. The spectrometer consists in three separate sensor units working together. The interface is digital, and temperature compensation and analogue to digital conversion takes place in the sensor modules. In spite of the number of channels communication between the spectrometer and a micro-processor requires only two wires. The spectrometer supports two different communication protocols, the specialized I2C and a generic serial communication (UART).

Continue reading