This video walks through a complete, real-world engineering workflow: designing a custom PCB from scratch, writing the firmware, and integrating it with Modbus RS485 — all to solve an actual client's need for electrical energy monitoring.

What makes this stand out from the typical "I built a thing" project video is the professional context. This isn't a hobby build or a school assignment — it's a commissioned solution for industrial energy monitoring. That distinction matters because it forces decisions you don't encounter in tutorials: choosing the right communication protocol for the environment, designing a PCB that needs to be reliable in deployment, and writing firmware that interfaces with real metering hardware over RS485.

The video covers three distinct engineering disciplines in one project. Hardware design (custom PCB layout for an ESP32-based system), firmware development (programming the microcontroller to read and process energy data), and protocol integration (implementing Modbus communication, the dominant standard in industrial automation). Each of these is a deep topic on its own, and seeing how they come together in a single deliverable is genuinely instructive.

Note: the video is in Spanish, so non-Spanish speakers may want to use auto-translated captions. The visual content — schematics, PCB layouts, code, and the finished board — communicates well regardless of language.