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 This ESP8266 Mini Relay board is a compact WiFi-enabled smart controller designed for home automation and IoT applications. It features 4 high-quality relays, a 1.3-inch OLED display, onboard RTC (real-time clock), WS2812 Pixel LED output, and built-in WiFi configuration using AP mode. The board allows real-time relay control, time scheduling, status display, and mobile-friendly web dashboard access. Ideal for smart home projects, industrial automation, lighting control, and remote switching systems 

 This DC to DC buck converter circuit is designed using the LM2576-5 switching regulator, ideal for converting 7V to 36V DC input into a stable 5V DC output. The compact PCB layout ensures high efficiency, low heat dissipation, and reliable performance in industrial and embedded applications.

This module is perfect for PLC systems, Arduino projects, ESP32 / ESP8266 boards, IoT devices, relay controllers, LED drivers, and automation panels where a stable 5V power supply is required from a 12V or 24V DC source.

 This industrial-grade 4-channel opto-isolated interface card is designed to safely interface PLC digital outputs with external driver or control circuits. Each channel uses PC817 optocouplers to provide reliable galvanic isolation between field wiring and control electronics. 

🔹 Key Features:

• 4 Independent Opto-Isolated Channels
• PC817 Industrial Optocouplers
•  24V PLC Compatible Inputs
•  1N4007 Reverse Polarity Protection
•  RC Noise Filtering for Stable Operation