This module contains two electromechanical relays for switching external loads from a low-power microcontroller. It is typically driven by logic control inputs and powered from 12V for the relay coils, allowing isolation between the control side and the switched circuit.
| Pin | Signal | Description |
|---|---|---|
NO1 |
Normally-open contact for relay 1; connects to COM1 when relay 1 energizes. | |
COM1 |
Common switched terminal for relay 1 load circuit. | |
NC1 |
Normally-closed contact for relay 1; connected to COM1 when relay is off. | |
NO2 |
Normally-open contact for relay 2; connects to COM2 when relay 2 energizes. | |
COM2 |
Common switched terminal for relay 2 load circuit. | |
NC2 |
Normally-closed contact for relay 2; connected to COM2 when relay is off. | |
DC+ |
power | 12V positive supply input for the relay module coils and driver circuitry. |
DC- |
ground | Power ground/negative supply reference for the relay module control side. |
IN1 |
digital | Control input for relay 1; drive from MCU logic to switch channel 1. |
IN2 |
digital | Control input for relay 2; drive from MCU logic to switch channel 2. |
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