1-channel 5V relay module microcontrollerDevelopment boardExpansion board

Optocoupler Isolation and Low-Level Triggering — Built-in optocouplers provide electrical isolation between the control and load sides, ensuring safer MCU operation. Dedicated low-level trigger inputs (IN1/IN2, etc.) allow for direct compatibility with Arduino, ESP32, STM32, Raspberry Pi, and other 3.3V/5V logic-level control boards. 5V/12V Coil Versions Available — Choose the appropriate module voltage (5V or 12V DC coil) based on system requirements. Clear PCB markings for VCC, GND, IN, and relay terminals simplify wiring and reduce the risk of installation errors. Reliable Songle Relays and NO/NC/COM Terminals — Equipped with high-quality blue relays rated for loads up to AC 250V 10A / DC 30V 10A. Screw terminals provide Normally Open (NO), Normally Closed (NC), and Common (COM) outputs, enabling flexible control of various loads such as lights, motors, valves, and solenoids. Status Indicators and Protective Design — Onboard power and relay status LEDs provide intuitive, real-time feedback. The compact black FR4 PCB features mounting holes and an optimized thermal layout, making it suitable for enclosure mounting, panel integration, or use in breadboard and development projects. Scalable 1/2/4/8/16-Channel Configurations — A wide range of options—from single-channel to 16-channel modules—suits applications in smart home systems, IoT, industrial control, and educational development. Channel counts can be flexibly combined or expanded to meet specific project needs.