Luckily his chosen platform, the ESP32, has some phenomenal power saving features. You just need to know how to use them. The custom board can read from six soil sensors.

The power of Espressif’s ESP32-S3 meets Arduino’s unmatched customer experience, documentation and community — all in the compact form factor of the Nano. Provides support for both ...

If you are interested in deploying LoRa — the low power long-range wireless technology — you might enjoy [Rui Santos’] project and video about using the ESP32 with the Arduino IDE to ...