Key Features:

1. Low Level Trigger:

   • The module operates in low-level trigger mode, meaning it activates the relay when the input signal is below 2.0V. This is ideal for working with microcontrollers that output low signals.

2. Relay Control:

   • Controls 2 relays, allowing you to switch up to two devices simultaneously. Each relay can handle AC control voltage of 250V at a maximum of 10A, and DC control voltage of 30V at a maximum of 10A.

3. Opto-Isolation:

   • The module is equipped with optocoupler circuitry for electrical isolation between the control circuit (low-voltage side) and the load (high-voltage side). This helps protect your microcontroller from high voltages.

4. Back EMF Protection:

   • The module is designed with protection against back EMF (electromagnetic force), ensuring that the relay's operation does not cause damage to the components from voltage spikes.

5. LED Indicators:

   • 2 separate LEDs show when the relays are activated (ON) or not activated (OFF). This provides clear visual feedback on the relay's status.

6. Works with Logic Level Signals:

   • Compatible with 3.3V or 5V logic level signals, making it suitable for microcontrollers such as Arduino, PIC, ARM, 8051, AVR, MSP430, or any TTL-compatible device.

7. Triggering Voltage:

   • The triggering input voltage for the relay is between 3.3V to 5V. You can easily connect it to your microcontroller for controlling appliances and devices.

8. Current Protection:

   • The module is equipped with diode current protection to ensure safe and efficient operation. It also has short response time, ensuring rapid switching of the relay.

9. Easy Installation:

   • The board comes with 4 mounting holes for easy installation. The hole diameter is 3.1mm, which makes it convenient to mount on various surfaces or projects.

10. Jumper Configuration:

    • The module can be set to either high-level or low-level trigger mode. You can configure it using jumpers:
      • Low-level Trigger: Relay is triggered when input goes low (0V/GND).
      • High-level Trigger: Relay is triggered when input goes high (5V).

Applications:

• Home Automation:

  • Control home appliances, lights, fans, or other electrical devices with your microcontroller.

• Industrial Control Systems:

  • Useful in industrial automation systems where control of high-power devices is required from a microcontroller.

• Embedded Systems:

  • Perfect for projects requiring controlled switching of devices, sensors, or actuators in robotics and embedded electronics.

• Microcontroller Integration:

  • Works with various microcontrollers (Arduino, Raspberry Pi, PIC, etc.), allowing seamless integration for controlling relays via a low-voltage signal.

Advantages:

1. Opto-Isolation:

   • Provides protection for your low-voltage microcontroller circuit from high-voltage spikes.

2. Wide Voltage Range:

   • Works with 3.3V or 5V logic signals, making it versatile for different microcontroller platforms.

3. Back EMF Protection:

   • Ensures safe operation and longevity of your components by protecting against harmful voltage spikes from motors or inductive loads.

4. Dual Relay:

   • Controls 2 devices simultaneously, which is more efficient for managing multiple loads.

5. LED Feedback:

   • Clear visual indication of the relay status, allowing for easy monitoring of system operation.