Cheap Sensors and an SDR Monitor Conditions in this Filament Drying Farm

We don’t know the place [Scott M. Baker] calls house, but it surely should be an attractive humid position certainly. In spite of everything, he has invested moderately just a little in fancy vacuum garage boxes to stay his Three-D-printer filament dry, with the end result being this sensor-laden filament drying farm.

[Scott] wasn’t content material to only use those PrintDry boxes with out figuring out what’s happening inside of. After a little bit cleansing and lube to get all of the boxes operating, he set about development the sensors. He settled on a wi-fi machine, with every container getting a BME280 temperature/humidity/drive sensor and an SYN115 315-MHz ISM band transmitter module. Those move with an ATtiny85 right into a compact Three-D-printed case maintaining a little bit silica desiccant. The transmitters are programmed to agree to ISM-band rules – no want to run afoul of the ones regulations – whilst the receiver is solely an SDR dongle and a Raspberry Pi working rtl_433. The long-ish video underneath main points design and development.

The speculation in the back of those vacuum boxes would appear to be to drag out humid air and save you it from coming again in. However as [Scott] temporarily discovered from his telemetry, following the directions leads to the an identical atmospheric drive of most effective about 2700′ (823 meters) elevation – now not precisely a difficult vacuum. However as [Scott] issues out, it’s sufficient to get a pleasant, tight seal, and his numbers display a diminished and dependable relative humidity over the years.