The Arduino core v4.0 overhauls its Bluetooth libraries with modernized, safer codebases: the BLE library gains a unified API across NimBLE and Bluedroid with Bluetooth 5 enabled by default, while BluetoothSerial adds multi-peer support. Here is what changed and how to migrate from v3.3.12 to v4.0.0-RC1.
FOFOCA is an open-source reference design for an AI-governed household robot, built around a Raspberry Pi 5 brain, an ESP32 for real-time motor control and sensor polling, and an ESP32-C3 driving an OLED status display over MQTT. This article walks through the hardware architecture, the firmware running on each Espressif chip, and how all of it connects to a local edge AI server running NVIDIA Nemotron Nano 8B for inference — no cloud dependency required.
