Paul McCabe] wrote in to let us know about his $25 robot. This small wheeled robot is based on an ESP32 and made using cardboard and hot glue. You drive the contraption using a Bluetooth game ...
TinyML is an incredibly powerful piece of software, and you can easily train your own model and deploy it on an ESP32.
ESPHome Modbus TCP↔RTU Bridge – Transparent bridge for ESP8266/ESP32 that lets multiple Modbus TCP clients communicate with RTU slaves over UART/RS485.