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# FreeDSM (Free Dark Sky Meter)
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## This DIY photometer is part of the project [_Gaia4sustainability_](https://gaia4sustainability.eu/language/en/gaia-4-sustainability/)
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<img src="uploads/9c1fcbd76f11ced648335ca94c03ecd0/darksky.png" width="120" height="120">
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FreeDSM is a device that 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 those diods, it provides the mpsas measurements every minute (its range is 12-23 mpsas).
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