The “w” in the name is for WiFi as the built-in ESP-32 module then takes the moisture reading and sends an update wirelessly via MQTT.

The board naturally has a power supply and headers for programming the ESP module as well as connectors galore. Flash in some camera code, and you’ve got a custom WiFi webcam. Pretty slick.

Designed by Namnam in Vietnam, the ESP32 Modbus gateway is built to communicate with PLCs and industrial sensors over Modbus ...