A87 4 roads opto-isolation module high-low level expansion board

The A87 4 Roads Opto-Isolation Module High-Low Level Expansion Board is a compact 4-channel signal isolation module designed to protect microcontrollers and control systems from electrical interference, voltage spikes, and high-voltage damage. Using onboard optocouplers, the module electrically isolates the input and output circuits, ensuring safer and more reliable communication between low-voltage controllers and external devices. It supports both high-level and low-level triggering, making it compatible with a wide range of control applications using Arduino, ESP32, ESP8266, STM32, Raspberry Pi, PLCs,