5 pcs 4 Channel 12V Relay Module Shield Expansion Board For Arduino Optical Isolation

Description

Product Features: 4 channel relay module, with Optical Isolation, high level absorption. PCB backside has solder mask window, users can add tin to increase control current. With LED indicator. Pin instruction: 1. VCC-12V power. 2. GND 3. IN1-control terminals 1, high level relay absorption, low level relay release. Drive current should be more than 4 mA. 4. IN2-control terminals 2, high level relay absorption, low level relay release. 5. IN3-control terminals 3, high level relay absorption, low level relay release. 6. IN4-control terminals 4, high level relay absorption, low level relay release. 7. COM-control circuit ground. short circuit with GND . 8. GND Package includes: 5 X 4 Channel 12V Relay Module