
The 4-Channel PC817 Optocoupler Voltage Isolation Module is designed to provide electrical signal isolation between input and output circuits. It uses four PC817 optocouplers to transmit control signals between electrically isolated circuits, helping protect sensitive microcontrollers and control boards from electrical interference. This module is suitable for Arduino, ESP32, PLC systems, and other electronic control applications that require multi-channel signal isolation. It is ideal for industrial automation, voltage control interfaces, and microcontroller-based projects.