Building an inexpensive lux meter for the observatory…
As part of an environmental monitoring system for an observatory, I wanted to include a measure of ambient light. Ostensibly, this is for safety reasons. However, I must admit that I really just want to see if I can (coarsely) measure sky brightness. There are a number of inexpensive light sensors available from AliExpress/Amazon. The two that I show here are based on the TEMT6000 sensor and the LM393 voltage comparator. Both cost less than $1.50. Hooking up the sensors…