Dual TTL UART Ethernet Bridge

A small-form-factor (4.5 × 2.5 × 1.2 cm), lightweight (~15 g) PCB module offering two TTL UART interfaces and one RJ45 Ethernet port. It operates from either 3.3V or 5V DC, consuming 140mA under load. UART baud rates are fully configurable from 300 bps to 921.6 kbps, and both serial channels support 3.3V and 5V logic levels natively. Ethernet communication uses UDP exclusively—no TCP, no HTTP, no TLS—ensuring simplicity, speed, and reliability in embedded environments. Configuration is done via UART AT commands, and all settings survive power cycles due to internal flash storage. The module acts as a bidirectional serial tunnel: UART data is packetised into UDP datagrams addressed to a predefined IPv4 destination; inbound UDP packets from that source are streamed to the respective UART output. There is no packet inspection, filtering, or protocol translation—just raw, low-overhead forwarding. Engineered for longevity and stability in unattended operation, it suits applications including remote equipment diagnostics, distributed sensor aggregation, machine tool connectivity, and educational embedded labs—where ease of integration, predictable behaviour, and compatibility with diverse microcontrollers outweigh feature-rich but fragile software solutions.