FeinStoiber case (luftdaten.info)

thingiverse

This is another test case for the DYO dust sensor of https://luftdaten.info/. It includes the following components: * NodeMCU v3 * SDS011 * BME280 * DC/DC Converter (LM2596 Buck Converter Module) This case has several features: * The NodeMCU antenna is kept at a safe distance from other metal parts, which should improve reception. * Using a DC/DC converter allows for higher voltages, such as 12V, reducing the impact of voltage drops in long/thin cables. * No pipe is needed. * A Stevenson screen is used to protect the temperature/humidity/pressure sensor. Additional required items: * Hot glue * Small piece of mosquito net * Superglue * 2x DIN912 M3 30mm screw * 2x DIN912 M3 50mm screw Building instructions: * Print out all parts, with only the covers requiring supports on the build plate. * Use PTEG for a more UV-stable finish. * Glue in the SDS011 sensor using hot glue and use a pen to keep air inside the hole open (see picture). * Wire components correctly before gluing them in place with hot glue. * Fix mosquito netting to air duct covers using superglue. * Close the casing and screw it together (not too hard!). * Install the temperature sensor, closing remaining holes with hot glue as well. * Cover the temperature sensor with a Stevenson screen and attach the base plate. * Install all other air covers and secure them with hot glue. Other information: * The holes at the bottom are intentional - it's impossible to seal a case against pressure changes and condensation without a membrane. Instead, let water drip out through 3mm holes.