2. Hardware Overview

SMHUB is a Linux-based modular hub designed to unify connectivity, automation, and control across multiple smart home and IoT standards. Its hardware architecture combines high-performance networking, multiple radios, built-in peripherals, and modular power options . 

 2.1 Core System 

 

 

 Processor: 2 separate cores: C906@1GHz (for Linux) + C906@700MHz (for RTOS). C906 is an ultra-high-efficiency processor compatible with the RV64IMA[F]C[V] instruction set. It is one of the industry's first mass-produced processors supporting the RISC-V vector extension. 

 

 NPU (Neural Processing Unit): 0.5 TOPS@INT8. 

 

 Memory: 512 MB RAM. 

 

 

 Storage: Onboard eMMC storage plus microSD slot for expansion. 

 

 

 Operating System: Embedded Linux with Node.js runtime, supporting smart applications such as Zigbee2MQTT, Matterbridge, Node-RED, and custom Node.js/Python services. 

 

 

 2.2 Networking 

 

 

 Ethernet: Integrated RJ-45 port for wired backbone connectivity. 

 

 

 Wi-Fi: 

 

 

 Dual-band 2.4 GHz and 5 GHz support. 

 

 

 Can operate in Access Point mode or Client mode. 

 

 

 CLI setup available, with web UI configuration in development. 

 

 

 

 

 Bluetooth: 

 

 

 Bluetooth 5.0 compliant. 

 

 

 Supports Bluetooth Low Energy (BLE) for pairing, sensors, and beacons. 

 

 

 Available for integrations and custom applications. 

 

 

 

 

 2.3 Radios 

 

 

 Zigbee (CC26xx) → dedicated radio for Zigbee networks, fully compatible with Zigbee2MQTT. 

 

 

 Thread (EFR32MG series) → native support for Thread and OpenThread Border Router (OTBR). 

 

 

 EFR32ZG23 Expansion Module → provides Sub-GHz communications including Z-Wave , integrated via UART3 with dedicated reset, flash, and LED lines. 

 

 

 2.4 Expansion Modules 

 

 

 UPS Module (SM-HUB UPS) 

 

 

 Powered by 18650 Li-ion battery cells . 

 

 

 Charging via TP5100. 

 

 

 Step-up/step-down converters deliver 5 V, 3.3 V, and 1.8 V rails . 

 

 

 INA226 sensor monitors voltage and current for telemetry. 

 

 

 Solar/DC charging input supported. 

 

 

 

 

 PoE Module (SM-HUB PoE) 

 

 

 802.3af compliant (Power over Ethernet). 

 

 

 Converts Ethernet-supplied power to regulated 5 V. 

 

 

 Surge and ESD protection integrated. 

 

 

 “Power-check” signals exposed for system monitoring. 

 

 

 

 

 4G/LTE Module (SM-HUB 4G) 

 

 

 Based on SIM7672G modem with GNSS (GPS/GLONASS) . 

 

 

 NanoSIM slot with SIM detect. 

 

 

 Interfaces: main UART, USB, debug UART. 

 

 

 LTE and GNSS antenna connectors. 

 

 

 Power and network LED indicators. 

 

 

 

 

 2.5 Built-in Peripherals 

 

 

 LEDs: 

 

 

 12 × WS2812B addressable RGB LEDs – configurable for system visualization, animations, or Ambilight effects. 

 

 

 4 × service LEDs – indicating power, network, and radio activity. 

 

 

 

 

 Buttons: 

 

 

 Reset button . 

 

 

 Pairing/Function button . 

 

 

 User-configurable button . 

 

 

 

 

 Audio Output: 

 

 

 3.5 mm audio jack . 

 

 

 Supports system notifications, alerts, or media playback. 

 

 

 

 

 Buzzer: 

 

 

 Integrated piezoelectric buzzer. 

 

 

 Usable for system alerts, notifications, or user automation rules. 

 

 

 

 

 IR Modules: 

 

 

 IR transmitter for controlling TVs, AC units, and other IR devices. 

 

 

 IR receiver for capturing signals from existing remotes. 

 

 

 

 

 2.6 Power Architecture 

 

 

 Primary Power: USB-C PD input. 

 

 

 Optional Power Sources: 

 

 

 PoE (via PoE module). 

 

 

 UPS battery module. 

 

 

 Solar/DC input (through UPS module). 

 

 

 

 

 Smart USB Power Switching: Automatic host/device detection on USB-C CC lines with integrated FET switching. Prevents reverse powering and ensures safe operation whether SMHUB is supplying power to peripherals or being powered itself. 

 

 

 2.7 Expansion & DIY Interfaces 

 For developers and hardware enthusiasts, SMHUB exposes additional interfaces: 

 

 

 GPIO headers with UART, SPI, and I²C. 

 

 

 DIY pinouts for custom modules, sensors, or experimental expansions.