5V 1-channel relay module with 12V supply and 5V control This module provides a single relay that can be controlled by any 5V digital output from your microcontroller. The board is designed to operate from a 12V supply while accepting 5V logic signals for triggering the relay coil. Key benefits - Protects your microcontroller I/O: SMD optocoupler isolation separates the control side from the relay switching current, reducing the risk of damage from relay transients. - Flexible trigger mode: a jumper allows you to configure the relay for high or low level triggering to match your signal state. - Low trigger current: only 5 mA is required to trigger the relay, enabling efficient control from common microcontrollers. - Reliable wiring and connections: screw terminals for relay contacts (NC, C, NO) and input signals; convenient coil and trigger wiring with coil +, coil, and trigger labels. - Strong switching capability: normally open contact supports AC loads of 125-250V at up to 10A, and DC loads of 28-30V at up to 10A. - Robust mounting options: four 3.1 mm mounting holes for secure installation. - Broad compatibility: suitable for ARM, PIC, AVR, other MCUs, Raspberry Pi, CNC machines, PS4, and similar systems. Specifications at a glance - Control: 5V digital output to trigger the relay - Coil/board operating voltage: 12V - Relay contacts (NO/COM/NC): normally open configuration - Peak load (normally open): AC 125-250V, 10A - Peak load (DC): DC 28-30V, 10A - Trigger current: 5 mA - Input and relay screw terminals available - Terminals labeled: NC, C, NO, input; coil +, coil, trigger - Mounting: four 3.1 mm fixed bolt holes Working principle and features - Isolation: the SMD optocoupler isolates the I/O port from the relay switching current, protecting your control circuitry from switching spikes and noise. - Jumper selection: a jumper enables you to choose between high-level or low-level trigger operation, allowing easy adaptation to different control schemes. - Simple integration: designed to be driven by a 5V logic output while requiring a 12V supply for the relay coil, enabling compatibility with a wide range of microcontrollers and single-board computers. Applications and use scenarios - Home or office automation: switch lighting, fans, or small appliances from a microcontroller or single-board computer, with electrical isolation to protect the control board. - Industrial and CNC applications: control peripheral devices such as indicators, valves, or small motors in CNC setups or factory automation, using the relay to isolate the control electronics from high-power loads. - embedded projects with Raspberry Pi or microcontrollers: drive external devices (up to 10A at appropriate voltages) while keeping the control logic isolated from switching transients. - Gaming consoles or consumer electronics: interface with external power-controlled peripherals while maintaining safe signal levels and protection for the control circuitry. Notes - Ensure the external load is within the specified peak load ratings (10A at AC 125-250V or DC 28-30V) for safe operation. - Use appropriate wiring and fuse protection for high-voltage AC loads. - Verify the correct jumper setting for your chosen trigger polarity to match your control signal. This description preserves the original product’s model features and specifications while presenting clear, customer-focused benefits and practical usage guidance.