Smart AC Load & Fan Controller

Mains-powered controller for switching fans, heaters and cooling loads with an ESP32-based control interface.

Energy & Power4L · ESP32

Smart AC Load & Fan Controller PCB design by CircuitNexa

Project overview

Mains-powered controller for switching fans, heaters and cooling loads with an ESP32-based control interface.

Engineering approach

Power electronics work lives or dies on thermal design and conversion efficiency, with layout decisions directly affecting how much heat a board has to shed. On this board, that translates into a component set built around 4L and ESP32, with layout and stack-up decisions driven by power conversion efficiency, thermal management, and accurate current and voltage sensing.

Technical specification

4L · ESP32

Hardware photo

Smart AC Load & Fan Controller PCB on the bench, showing the CH1-CH4 screw-terminal relay outputs, VIN/GND power input, and ESP32 module, alongside a breadboard and relay module used for testing — The manufactured board on the bench, showing the CH1–CH4 screw-terminal outputs, onboard relays, and ESP32 module.

Engineering focus

This portfolio project demonstrates CircuitNexa's electronics engineering and PCB design work in the energy & power space. The design shown here is part of a broader portfolio spanning schematic capture, PCB layout, embedded firmware, prototyping, and support through to manufacturing.

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