SQM Sky Quality Meter

http://jompo.free.fr/sqm/

https://github.com/romanhujer/SQM

https://sourceforge.net/projects/arduinomysqmskyqualitymeter/

https://sourceforge.net/projects/mysqmproesp32/

http://atm.udjat.nl/stepper/sqm/index.html

http://www.unihedron.com/projects/sqm-lu/

Display RGB ST7789
https://diegolamonica.info/howto-use-tft-display-st7789-with-wemos-d1-r2/
https://www.youtube.com/watch?v=w_G7khy29HA

Datasheet: http://www.lcdwiki.com/1.3inch_IPS_Module

Bezug: https://www.ebay.de/itm/124037047140?_skw=ST7789%2C+SPI%2C+240x240

Lichtsensor TSL2591
https://simple-circuit.com/interfacing-tsl2591-light-sensor-module-with-arduino/
Portable Weather Station for Night Sky Observers
https://www.esp8266learning.com/tsl2591-light-to-digital-converter-and-esp8266-example.php

https://www.cloudynights.com/topic/800921-tls237-replacement/