The 5V 1-Channel Relay Module is a reliable switching board that lets microcontrollers safely control higher-voltage or higher-current devices such as lamps, fans, solenoids, pumps, and other appliances. It uses a 5V coil relay rated up to 10A (typical resistive rating) and features optocoupler isolation to help reduce electrical noise and improve protection between your control side and the load side.
This module is designed for easy integration with popular development boards including Arduino, AVR, PIC, ARM, and DSP MCUs. With a low-level trigger input, the relay turns ON when the input pin is driven LOW, which is convenient for many microcontroller setups.
Control Side (3-pin header):
| Pin | Function |
|---|---|
| VCC | 5V supply |
| GND | Ground |
| IN | Trigger input (LOW = ON) |
Load Side (Screw terminals):
| Terminal | Meaning |
|---|---|
| COM | Common |
| NO | Normally Open (connects to COM when relay ON) |
| NC | Normally Closed (connects to COM when relay OFF) |
| Item | Details |
|---|---|
| Module Type | 1-channel relay module |
| Coil Voltage | 5V DC |
| Trigger Type | Low-level trigger |
| Isolation | Optocoupler |
| Relay Rating (Typical) | 10A @ 250VAC / 10A @ 30VDC (resistive) |
| Use With | Arduino, AVR, PIC, ARM, DSP, MCU boards |
Safety note: Mains AC wiring can be dangerous. Use proper insulation, enclosures, and wiring practices, and never exceed relay/load ratings.
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