5V 12V 24V 1 Way 1 Channel Relay Module Board Shield with Optocoupler Isolation Support and Low Level Trigger for Onecolor This 1channel relay module shield is designed to connect a microcontroller or control board to a relay in a safe and flexible way. It features optocoupler isolation, allowing the control side to stay isolated from the relay coil, and supports both level and lowlevel triggering. Available in 5V, 12V, and 24V coil versions, it is suitable for a range of projects that require reliable switching of loads through a compact shield form factor. Key benefits Optocoupler isolation protects the control circuitry from voltage spikes and noise on the relay side, reducing the risk of damage to microcontrollers and sensors. Flexible triggering supports both level and lowlevel control signals, enabling easy integration with diverse controllers and logic levels. Wide coil voltage options (5V, 12V, 24V) allow you to choose the version that matches your project power supply and interface requirements. Shield form factor enables straightforward mounting on compatible development boards, simplifying prototyping and deployment. Clear status indication with an LED illuminates when the relay is active, aiding troubleshooting and monitoring. Compact, singlechannel design provides a simple and reliable peripheral for automation, control, and testing tasks. Key attributes Functionality: 1channel relay module with optocoupler isolation and support for both level and lowlevel triggering. Compatibility: designed to work with standard control interfaces; available in 5V, 12V, and 24V coil variants to fit different systems. Size and form factor: shieldstyle board intended for easy integration with common development boards and projects. Material and construction: PCBbased module incorporating a relay, optocoupler, indicators, and input/output wiring interfaces. Performance: reliable switching for typical control applications, with isolation to minimize interference between control and load circuits. Technical and usage notes Variant selection: choose the coil voltage version (5V, 12V, or 24V) that matches your system power supply and control requirements. Trigger mode: the module supports both level and lowlevel trigger operation, allowing compatibility with a wide range of controllers and programming approaches. Control interface: designed to be driven by standard control signals from microcontrollers and development boards; ensure your control side voltage is compatible with the module's input specifications. Use with caution: while the module provides isolation, proper wiring and safety practices should be observed when switching current or voltage loads. Applications and use cases Home automation: enable or disable lighting, fans, or outlets from a microcontroller or automation hub with reliable isolation. Small automation projects: switch motors, pumps, or actuators in hobbyist machines, test benches, or educational experiments. Prototyping and testing: quickly add a controllable relay to development boards for demonstrations, experiments, or proofofconcept builds. Notes for procurement The product is branded for Onecolor and is presented as a 5V/12V/24V 1channel relay module shield with optocoupler isolation and support for both level and lowlevel triggering. Choose the coil voltage variant that matches your project requirements and wiring practices.