The 1 Channel 5V Relay Board Module is a compact electromechanical switching module designed to control high-voltage or high-current electrical devices using a low-voltage signal from microcontrollers such as Arduino, ESP32, Raspberry Pi, and other development boards. It typically uses an SRD-05VDC-SL-C relay with NO, COM, and NC terminals, allowing flexible switching configurations. Many versions also include an optocoupler and LED indicator for improved isolation and easy status monitoring.
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