Clear Sky Sensor Box

Well, don't trust my data too much. There are still a lot of calibration issues. The only thing that is working well ( I think) is the temperature sensor. The rain detector is very dependent on the temperature and I have yet to take that into account. Same thing with the cloud detector. And The SQM is clipping at a value that is a bit low. For this, the only thing I can do to calibrate it is buy a real SQM device from Unihedron. For now, the calibration has been done by measuring sky brightness with a CCD through a Celectron C9.25 and converting that to a usable SQM value with photometry equations. But it's probably false or or the calibration data is poor.
So I don't think my code would be that helpfull, especially since I designed part of the electronics myself ( for ex, the rain detector had no control circuitry and no obvious way to read it so I had to design that ). Plus it is not documented enough to be released to the public and written for an arduino nano, not for a raspberry pi.

Nevertheless, here is the hardware:
- Brain : Arduino nano ( + an esp8266 to send data through wifi)
- Temperature : waterproof DS18S20 placed in its own radiation shield to protect it from the sun. It uses the Onewire library and has multiple tutorials on how to use it.
- Humidity : HIH4030 ( quite pricey but it gives an easy to use analog output, the conversion formula is given by the datasheet)
- Cloud detector : a MLX90614 infrared sensor to measure the temperature of the sky. It is controlled with a variant of i2C if I recall correctly. There are also a bunch of tutorials to use this one. Here's the Adafruit library I use : https://github.com/adafruit/Adafruit-MLX90614-Library
-Rain detector : a capacitive rain sensor by Telecontrolli ( they don't manufacture mine anymore but they got e new one apparently , https://www.radiocontrolli.com/en/component/62/capacitive-rain-sensor)
- The sky quality meter is based on TLS237 with a ir-cut filter and a led lens to limit the FOV of the sensor. T
- For general luminosity : an old and simple LDR ( light sensitive resistor) I got in stock.

Is used this website as an inspiration : https://sourceforge.net/projects/arduinomysqmskyqualitymeter/

For the cloud detector: here's a technical document used by the companiues who build the various weather stations for astronomers ( ex : AAG cloudwatcher) : https://lunatico.es/aagcw/TechInfo/SkyTemperatureModel.pdf

Here you go. Hope this helps.