The DEVSKY 4CH RELAY PCB is an advanced IoT-enabled relay controller board developed for modern automation systems. Designed with reliability, compactness, and scalability in mind, this controller allows users to wirelessly control up to 4 electrical devices using a smartphone application over WiFi.

Powered by the ESP8266 WiFi module, the board combines smart switching, sensor monitoring, and automation capabilities into a single professional PCB solution. Whether you are building a smart home, industrial control system, IoT startup project, or custom automation setup, RelayHub 4X provides a flexible and ready-to-deploy platform.

Key Features

✅ 4 Channel Relay Output
✅ ESP8266 WiFi Connectivity
✅ Mobile App Based Control
✅ Real-Time LDR Sensor Monitoring
✅ Smart Buzzer Alert System
✅ 5V / 12V Input Support
✅ Compact 72mm × 80mm PCB Size
✅ GPIO Expansion Headers
✅ Industrial Screw Terminals
✅ DIY & Product Integration Ready
✅ OTA Firmware Upgrade Support (optional future update)
✅ Smart Home Compatible
✅ Ideal for IoT Projects & Automation

Its premium PCB layout, screw terminal outputs, onboard OLED display support, and modular architecture make it ideal for both beginners and professionals.

Built proudly by DevSky And Technical, this product is focused on affordability, reliability, and real-world deployment.