Wireless thermo-hygrometer

Comfy Digs

© Lead Image © shamain, 123RF.com

© Lead Image © shamain, 123RF.com

Article from Issue 226/2019

A WiFi sensor monitors indoor humidity and temperature and a Node-RED dashboard reports the results, helping you to maintain a pleasant environment.

If you live in a dry climate – or a hot region that requires air conditioning – you might find that your skin starts to feel taut: a good indication that the room air is too dry. Typical thermo-hygrometers can help you monitor humidity and room temperature, but they are usually stationary devices that can only be read when standing right in front of them.

In this article, I build a thermo-hygrometer to keep track of the temperature and humidity in your home. The device connects to a WiFi network and relies on an MQTT server to display its measured values on a Node-RED dashboard. For more information on the MQTT messaging protocol, refer to the "MQTT" box.

Initially, building your own wireless thermo-hygrometer doesn't sound that complicated, but after taking a closer look, you will realize that getting to the finished project involves a large number of individual steps.


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