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7Semi Dual-Channel 10 A SPDT I2C Relay Module with Qwiic and Independent Load Control
The 7Semi Dual-Channel SPDT I2C Relay Module provides independent control of 2 electrical loads from a microcontroller using only the SDA and SCL communication lines. It integrates 2 SPDT relays rated for switching compatible loads up to 230 V AC at 10 A, with separate NO, COM, and NC terminals for each channel. This configuration is well-suited for controlling lighting, pumps, appliances, actuators, and other electrical equipment in automation and embedded-control systems.
The module operates from a 5 V DC input and supports communication with both 3.3 V and 5 V I2C systems. Qwiic and STEMMA QT connectors simplify solderless integration with compatible development platforms, while configurable I2C addressing provides flexibility when multiple devices share the same bus. Power and relay-status LEDs provide clear visual feedback during operation, making the board suitable for Arduino, ESP32, Raspberry Pi, STM32 and RP2040 projects.
Key Features
- Dual SPDT Relays: Includes 2 independently controlled SPDT relay channels for switching separate electrical loads.
- 10 A Contact Rating: Each relay supports compatible loads up to 10 A under specified operating conditions.
- 230 V AC Switching: Supports compatible AC loads up to 230 V AC at 10 A.
- Independent Channel Control: Each relay can be switched separately through the I2C interface.
- NO, COM and NC Terminals: Each relay provides normally-open, common, and normally-closed contacts for flexible switching configurations.
- I2C Control: Uses SDA and SCL communication lines, reducing MCU GPIO requirements compared with individually controlled relay inputs.
- 5 V DC Input: Designed for operation from a 5 V DC power source.
- 3.3 V and 5 V Compatibility: Supports common 3.3 V and 5 V I2C development platforms.
- Qwiic Connectivity: Enables convenient solderless integration with compatible Qwiic controllers and peripherals.
- STEMMA QT Compatibility: Supports compatible STEMMA QT connections for easier prototyping and system expansion.
- Configurable I2C Address: Allows address configuration for integrating multiple I2C devices on a shared bus.
- Status LEDs: Power and relay-status indicators provide visual operating feedback.
- Broad Development-Board Support: Compatible with Arduino, ESP32, Raspberry Pi, STM32 and RP2040 platforms.
Applications
- Smart-home automation
- Dual lighting control
- Pump and valve control
- Appliance switching
- Industrial automation
- IoT control systems
- Robotics
- Remote equipment switching
- HVAC control
- Microcontroller relay projects
- Building-automation systems
- Laboratory equipment control
- Dual-load control systems
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Pinout Reference Guide
7Semi Dual Channel I2C Qwiic Relay
Circuit reference Guide using Arduino UNO
