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 . Built-in optocouplers provide galvanic isolation to protect your control board from electrical noise and voltage spikes .
Controls 2 Loads - Each relay switches up to 250V AC @ 10A or 30V DC @ 10A .
Flexible Triggering Many modules allow selecting highlevel or low-level trigger via onboard jumper .
Operating voltage is 5V DC. Trigger current is typically 5mA .
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 |
| Trigger Current | 5mA |
| Max Load (AC) | 250V @ 10A |
| Max Load (DC) | 30V @ 10A |
| Output Type | SPDT (NO, NC, COM) |
| Dimensions | ~50x41x18mm |
= 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) .
Output (Load Side) :
- NO (Normally Open), NC (Normally Closed), COM (Common) for each relay .
Key Features:
- Optocoupler isolation for microcontroller protection .
- Status LEDs for each relay (red) and power (green) .
- Screw terminals for secure load wiring .
= Applications =
- Home automation (lights, fans, garage doors) .
- Industrial control systems.
- Robotics and IoT projects.
- Security systems (alarms, locks).
Versatile & Safe Manage two highpower AC/DC devices safely .
Wide Compatibility - Works with 3.3V and 5V logic systems .
√ Includes status LEDs for real-time monitoring .
√ Standard screw terminals for easy wiring .
= 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 .
- 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 .
- Ensure load is within 250V AC @ 10A or 30V DC @ 10A rating .
Arduino resets or erratic behavior:
- Use an external 5V power supply for the relay module.
