July 2026
Intermediate
344 pages
10h 11m
English
Content preview from Digital Twins in Action
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appendix B Building a custom IoT sensor
Sometimes the exact sensor you need isn’t available off the shelf or in the right configuration. For example, you might need to combine temperature, humidity, and soil moisture in a single affordable unit. I needed to correlate soil moisture with ambient humidity to understand how indoor plants affect the home climate. No commercial sensor offered this combination affordably, so I built one.
B.1 Hardware
To build the environmental monitoring node used throughout this appendix, you’ll need an ESP32 development board, a temperature and humidity sensor, a soil moisture sensor, and a few basic prototyping components. The total cost is typically under US$25, depending on your supplier and location:
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