High-Power Home Automation System (30A ESP32)
ESP32-based home automation system capable of controlling high-current appliances up to 30A with safe switching design.
February 5, 2026
Overview:
A compact ESP32-based relay control board designed for switching AC loads while maintaining electrical isolation between the control electronics and high-voltage circuitry. The board integrates an AC-DC power module, optocoupler isolation, and relay drivers to safely control external loads using Wi-Fi enabled firmware.
Design:
The system uses ESP32 for control logic and switching circuits designed to handle high current loads safely. The board is divided into several functional sections:
Power Supply
- AC input through terminal block
- AC-DC conversion using HLK-PM01 module
- 3.3V regulation using AMS1117
Microcontroller
- ESP32-WROOM-32 module
- GPIO control for relay drivers
Relay Driver Circuit
- Transistor driver stage
- Flyback protection diodes
- Two relay outputs
Isolation
- Optocouplers separate control signals from high-voltage section
Schematic & Layout:
Key Features:
- Wi-Fi enabled microcontroller
- On-board AC-DC power supply
- Dual relay output control
- Optocoupler isolation for safer switching
- Push button inputs for local control
- Status LEDs for system indication
Challenges:
Ensuring safe switching and thermal stability while handling high current loads.
Application:
This board can be used for:
- Smart home automation
- Wi-Fi controlled appliances
- IoT relay switching systems
- Industrial remote switching