ESP32 Power Meter PCB Design

I have a sample schematic for an ESP32-based power-control board and need a custom new board designed with additional options and make production-ready version that meets Australian mains-safety rules.

Core objectives
The board must run directly from the AC line via an on-board, PCB-mount AC/DC converter. From that supply it will drive four relays (10 A or 16 A) while providing accurate energy monitoring on every channel. Wireless and wired connectivity are essential: 4 G cellular, Wi-Fi, Ethernet, plus a USB interface for firmware loading. I also need Modbus for external equipment, on-board GPS for location services, and a battery-backed RTC.

What I will provide
• schematic of closely similar product, and datasheets for the preferred AC/DC converter, cellular module, and GPS receiver.
• Mechanical outline, enclosure constraints, and notes on clearances required by AS/NZS mains-safety standards.

Your task
• Update the schematic to incorporate the new components and add missing features (USB, GPS, Modbus, battery socket, RTC).
• Lay out a multilayer PCB that respects creepage/clearance for 240 V AC, relay spacing, and antenna keep-outs.
• Generate manufacturing files (Gerbers, pick-and-place, assembly drawings) and a clean BOM with alternates.
• Deliver ready-to-flash test firmware that confirms power-up, relay switching, current sensing, cellular registration, Wi-Fi/Ethernet link, GPS lock, and Modbus transaction—all via USB for easy validation.

Acceptance
I consider the job complete when the design passes a 3-D DRC check in Altium (or KiCad) and an Australian compliance review for the mains section, and when your demo firmware reports stable readings on all four channels.

If you have hands-on experience with ESP32, high-voltage PCB layout, and cellular/GPS integration, I’d like to work with you.