The DHT21 Temperature Sensor Shows Signs of Instability

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From the graph, it appears that in recent days the DHT21 sensor used for recording ambient temperature has started to lose its reliability. Replacement is deemed necessary to prevent the data from being “contaminated” with unreliable values. Of course, a “cleanup” can be performed via the MySQL database at any time, but the sooner the replacement happens, the better.

solar water heater online faulty sensor warning
The temperature sensor has started to show signs of instability and is heading toward replacement

More specifically, in a graph that shows the behavior before and after the instability:

dht21-faulty-graph
In recent days, signs of instability and failure are clearly visible in a graph that includes only the temperature values
Thomas Karaferis
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