SCD30 Address Board
Industrial-grade Modbus RTU interface for scalable CO₂ sensor networking and diagnostics.
The SCD30 Address Board is a specialized interface solution designed to enable the creation of large-scale CO₂ sensor networks. It allows multiple Sensirion SCD30 sensors to coexist on a single Modbus RTU bus by providing physical address translation via on-board DIP-switches. This modularity makes it ideal for building-wide climate monitoring and industrial automation.
The hardware is engineered for reliability in harsh environments, featuring robust overvoltage and reverse polarity protection, alongside configurable RS-485 termination and bias resistors. The custom firmware, written in pure C, implements a full Modbus stack with advanced error reporting. A dedicated status LED provides real-time diagnostics via 14 unique fault codes, covering everything from CRC mismatches to bus timeouts.
Developed in collaboration with FieldGuard, this project represents a complete end-to-end engineering effort: from initial breadboard feasibility and protocol analysis to production-ready PCB layout and long-term stability testing.
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