Reference design
Smart Home Relay Board
ESP32WiFiApp
Overview
A reference design for an ESP32-WROOM based smart relay board that controls household electrical devices over WiFi and a mobile app. It targets residential and light-commercial smart-home solutions and is easy to integrate and expand.
Design highlights
- ESP32-WROOM microcontroller with 2.4GHz WiFi and Bluetooth, with headroom for OTA updates
- Opto-isolated relay outputs for lights/fans/appliances, with snubbers to suppress arcing
- On-board AC-DC power, no external adapter needed; over-current and over-voltage protection
- Mobile-app control with MQTT/cloud support for monitoring and scheduling
- OTA firmware updates and configuration recovery after power loss
Reference specifications
// DATASHEET
MicrocontrollerESP32-WROOM-32
ConnectivityWiFi 2.4GHz, BLE
Relay channels4–8 (configurable)
Load per channel10A @ 250VAC
Power90–264VAC on-board
ProtocolsMQTT, HTTP, OTA
Applications
- Smart switches / smart sockets
- Lighting and appliance control
- Remotely controlled panels for offices and shops
- Smart-home ecosystem integration (app, voice assistant)