5V 2-Channel Relay Module with Optocoupler
Dual High-Power Switching Module for Microcontrollers
This 2channel relay module enables safe independent control of two highpower AC/DC devices (lights, motors, pumps) via a microcontroller like Arduino, ESP32, or Raspberry Pi [citation:4]. Built-in optocouplers provide galvanic isolation to protect your control board from electrical noise and voltage spikes [citation:1][citation:4].
Controls 2 Loads - Each relay switches up to 250V AC @ 10A or 30V DC @ 10A [citation:2][citation:3][citation:4].
Flexible Triggering Many modules allow selecting highlevel or low-level trigger via onboard jumper [citation:2][citation:4][citation:8].
Operating voltage is 5V DC. Trigger current is typically 5mA [citation:4][citation:8].
Use an external 5V supply as Arduino's pin may not provide sufficient current for two relays.
Technical Specifications (Typical)
| Parameter | Value |
|---|
| Operating Voltage | 5V DC [citation:2][citation:3][citation:4] |
| Trigger Current | 5mA [citation:2][citation:4][citation:9] |
| Max Load (AC) | 250V @ 10A [citation:2][citation:3][citation:7] |
| Max Load (DC) | 30V @ 10A [citation:2][citation:3][citation:7] |
| Output Type | SPDT (NO, NC, COM) [citation:3] |
| Dimensions | ~50x41x18mm [citation:2][citation:4] |
= Pin Configuration & Features =
*Input (Control Side)* :
- *DC+ / VCC: 5V* power.
- *DC- / GND*: Ground.
- *IN1, IN2*: Signal inputs for Relay 1 & 2 (trigger level set by jumper) [citation:2][citation:4].
*Output (Load Side)* :
- *NO (Normally Open), NC (Normally Closed), COM (Common)* for each relay [citation:2][citation:3].
*Key Features*:
- Optocoupler isolation for microcontroller protection [citation:1][citation:4].
- Status LEDs for each relay (red) and power (green) [citation:2][citation:8].
- Screw terminals for secure load wiring [citation:4].
Applications
- Home automation (lights, fans, garage doors) [citation:4][citation:5].
- Industrial control systems.
- Robotics and IoT projects.
- Security systems (alarms, locks).
Versatile & Safe Manage two highpower AC/DC devices safely [citation:1][citation:4].
Wide Compatibility - Works with 3.3V and 5V logic systems [citation:4][citation:7].
√ Includes status LEDs for real-time monitoring [citation:2][citation:8].
√ Standard screw terminals for easy wiring [citation:4].
Troubleshooting
Relays not activating:
- Ensure stable 5V DC power supply. Arduino's 5V pin may be insufficient for two relays.
- Verify the trigger jumper is set correctly (High or Low) for your signal [citation:2][citation:4].
- Check signal logic: active high/low depending on jumper setting.
Load not switching:
- Verify load connected to NO (energized) or NC (de-energized) and COM terminals [citation:3].
- Ensure load is within 250V AC @ 10A or 30V DC @ 10A rating [citation:2][citation:4].
Arduino resets or erratic behavior:
- Use an external 5V power supply for the relay module.
