Failing to calibrate flame-s-vis-nir-es spectrometer

One of the many ways how not to do an absolute calibration of a fancy spectrometer, with some lessons learned.

Philips Hue White Ambiance is actually terrible...

...at color rendering, and not good for you in the evening.

Torch Bearer Spectrometer UI

Vastly improving the UI for the cheap Torch Bearer Spectrometer, whose protocol was reversed by someone else.

ESP32 as a Zigbee console

How to coerce ESP32(-C6) to work as a Zigbee console (CLI), and filling in the missing bits.

Final stretch for e32wamb: PCB, cables, antenna holder

Overview of the "last mile" to first version of e32wamb.