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## This DIY photometer is part of the project [_Gaia4sustainability_](https://gaia4sustainability.eu/language/en/gaia-4-sustainability/), funded by the Spanish MICINN through grant PDC2021-121059-C21/C22
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<img src="img/darksky.png" width="200"><img src="img/MICINN.png" width="400">
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<img src="img/darksky.png" width="200"><img src="img/MICIU.png" width="400">
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The **FreeDSM** allows you to measure the quality of the sky background during your night observations. It is a photometric instrument that incorporates the Osram TSL2591 sensor, with two diodes: one will make a measurement in the infrared range and the other in the full spectrum. From the data proviced by those diodes, it calculates the mpsas measurements every minute (its range is 12-23 mpsas) but algo temperature and humidity (sensor AHT2x).
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