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rreinhard

Slim Case for ESP8266 / LoLin NodeMcu plus DHT 22 with Airflow

by rreinhard Mar 22, 2018
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Hi, I used this as a starting point for 3 different case designs, two shorter ones so the usb power can be connected without opening the case for the DHT-22 and the other for the Phantom YoYo Light Sensor. The third one is for the DHT-22 with the power coming in from the back using a right angle connector so I can mount it on a wall and run the wire down the inside of the wall from the attic. (I hate exposed wires.) Thank you for such a great and versatile design. (The shorter case does heat up more than this one, but I need to use one as a reference anyway, so accuracy is not a concern.)

Thank you very much for your work! I made one and it looks very good. Unfortunately, it seems that my NodeMCU is warmer than I thought and the temperature sensor measures from 2 to 3 degrees more than other sensors in the same room. Have you ever met the same issue?

Hi. There are materials you can place between the DHT-22 and the NodeMCU to reflect the heat back to the NodeMCU. A cheap way to do this is to use a piece of aluminum foil sandwiched between 2 pieces of electrical tape, placed as close to the DHT-22 as possible to take advantage of the ventilation holes. I have seen some people report the DHT-22 has a 5 to 10 degree variability between devices (I suspect the difference between the people reporting a 5 degree and 10 degree difference is due to Fahrenheit versus Celsius.), which impacts the relative humidity approximately 2% for every degree Celsius (If I remember correctly.).