Residential-Industrial Smart Meter Design

I’m building two related devices—a 2-phase meter for homes and small businesses, and a 3-phase unit sized for factories and large loads. Both will ride on the same architecture, centred on an Orange Pi Zero2, and must accurately track voltage, current, power, energy (kWh), power factor and frequency.

Communications are set: Wi-Fi, Bluetooth and RS-232 all have to be live so the installer can choose the most convenient channel. A cloud dashboard will be the primary user interface, yet the meters must also stream clean text data through the local serial terminal for on-site diagnostics.

For the residential model I need an isolated voltage and current sensing front-end plus a relay that can be toggled remotely for service disconnects. The industrial version adds three high-current CT inputs (100 A–600 A range), a robust contactor for remote cut-off and industrial-grade surge protection.

Here’s what I’m expecting as tangible outputs:
• Schematic and PCB layout for both boards, complete with BOM and footprint libraries
• Firmware that runs on the Orange Pi Zero2, publishes readings over MQTT/HTTP, and listens for ON/OFF commands
• A lightweight web dashboard (can be Node-RED, React, or similar) that visualises live data and logs historical values
• Test procedures and a short validation report demonstrating measurement accuracy and safe remote switching

If you have prior experience with isolated measurement ICs, CT interfacing and Orange Pi kernel tweaking, you’ll be able to move quickly. Let’s discuss any clarifications you need before we lock down the milestone plan and start routing boards.