Relay Module
This dual-channel relay module is engineered to safely and reliably interface with microcontrollers that manage higher-voltage or higher-current loads. It provides a dedicated 5 V supply for powering the relay coils while the logic supply is aligned with the microcontroller’s I/O voltage (3.3 V or 5 V). The module accepts digital control signals to toggle the relays, and the relay contacts are designed with both normally-open (NO) and normally-closed (NC) configurations, offering versatile switching options.
Features
- 2 × 5 V relays with Normally Open (NO) and Normally Closed (NC) contacts
- Optical isolation between control (logic) and power (coil) sides
- LED indicators: one for power and one per channel
- Compatible with 3.3 V or 5 V logic
- Screw terminals for secure connection of power loads
Description
| Signal | Description |
|---|---|
| JDVCC | +5V for relay coils; isolated from MCU logic, enabling 3.3V systems. |
| VCC | Powers input drivers; must match MCU voltage (3.3V or 5V). |
| IN | MCU signal; high (~VCC) activates the optocoupler and relay. |
| NO1 / NO2 | Normally open contacts; close only when the relay is energized. |
| COM1 / COM2 | Common terminal toggling between NC and NO. |
| NC1 / NC2 | Normally closed contacts; open when the relay is active. |
| LED_PWR | LED showing JDVCC (5V) presence. |
| LED_IN | LED indicating control signal activity from IN. |
Common Applications
- Home Automation
- Industrial Automation
- IoT Projects
- Automated Irrigation
- HVAC Control
- Renewable Energy
- Testing & Laboratory
- Robotics & Mechatronics
- Smart Agriculture
- Vehicle Power Management
- Audio & Signaling
- Security & Alarm Systems
- Education & Demos