This 3.3V relay module is offered in 1, 2, 4, and 8 channel configurations. It supports high level and low level triggering and uses dual optocoupler isolation to separate control and load circuits. Key benefits and features - Flexible triggering options: can be driven by either high level or low level input signals to suit different controller designs. - Dual optocoupler isolation: provides enhanced electrical separation between the control side and the switched load, improving stability and protecting the control circuitry. - Reliable relay operation: designed for stable switching performance under 3.3V control systems. - Scalable channel configurations: choose 1, 2, 4, or 8 channels to match the task complexity and wiring plan. - 3.3V compatibility: compatible with common 3.3V microcontrollers and systems, making it a convenient option for electrical control tasks. - Easy integration: straightforward connections for control signals and load wiring, suitable for quick deployment in projects. Specifications and compatibility - Channel options: 1, 2, 4, or 8 channels - Trigger type: high level or low level trigger - Isolation: dual optocoupler isolation - Supply/drive voltage: 3.3V compatible module Practical use scenarios - Microcontroller projects: interface 3.3V controllers such as ESP32, ESP8266, or 3.3V MCU boards with isolated relay control for turning on/off mains devices while protecting the controller. - Home automation: expand relay control for lights, fans, or other appliances with electrical isolation to mitigate noise and ground-loop issues. - Prototyping and testing: build scalable control panels or automation test rigs requiring multiple relays and reliable isolation between control logic and load circuits. This module offers a straightforward, reliable solution for relay control tasks that require 3.3V logic compatibility, flexible triggering, and electrical isolation.