airRohr-Deckel (luftdaten.info)

thingiverse

Actually, it was supposed to be just a fast project, but such projects obviously don't work for me. I had the individual parts for the fine dust sensor already lying here since last year, but I only recently came to deal with it. After the technical side was soon clear (the instructions on the website: luftdaten.info are perfect) the question was where to accommodate all this as space-saving and inconspicuous as possible, while at the same time providing good protection for the electrical parts. The classic airRohr was too clumsy and huge, the solutions in boxes were often noted for sources of error such as heat build-up. I also found it not attractive to print a complete housing, especially in terms of weather resistance and susceptibility to moisture. Therefore, it came to this idea with a simple piece of pipe (connecting sleeve) from the hardware store, combined with up to two printed lids. The important lid here is the one for the bottom, because here the cables are fed and the parts are attached. The optional lid for the top is intended to support better ventilation, but according to my previous findings is not absolutely necessary. This probably also depends on where you place the sensor. The lower lid is actually designed for a DHT22 sensor, I then shortly decided to use a BME280 which may additionally also measure the air pressure. Nevertheless, this can be easily accommodated in the recess. The mounting plate is designed for 3mm screws, I have cut additional threads here as a precaution. It will be put into the lid and glued if necessary. All holes and openings are designed in such a way that no "visitors" nest in the housing. Should larger openings remain after the assembly, I recommend to seal them somehow. As I said, I am of the opinion that the ventilation is already sufficient, the additional cover may help a warm air to escape better out of the tube. As a precaution, I would print this with more top layers so that no water can penetrate from above. The Wi-Fi reception is impeccable with us, although our Fritzbox is several walls and one floor away.