hardware internet tech

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

We don’t know the place [Scott M. Baker] calls house, nevertheless it will have to be an attractive humid position certainly. After all, he has invested rather a little bit in fancy vacuum garage boxes to stay his 3-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 occurring within. After a bit of cleansing and lube to get all of the boxes operating, he set about development the sensors. He settled on a wi-fi gadget, with every container getting a BME280 temperature/humidity/force sensor and an SYN115 315-MHz ISM band transmitter module. These move with an ATtiny85 right into a compact 3-d-printed case keeping a bit of 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 operating rtl_433. The long-ish video beneath main points design and building.

The thought in the back of those vacuum boxes would appear to be to drag out humid air and save you it from coming again in. But as [Scott] briefly discovered from his telemetry, following the directions leads to the similar atmospheric force of best about 2700′ (823 meters) elevation – now not precisely a difficult vacuum. But as [Scott] issues out, it’s sufficient to get a pleasing, tight seal, and his numbers display a decreased and dependable relative humidity over the years.

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