2通道 2路 5V 繼電器擴充模組 附光耦保護

The optical coupler isolation was exactly what I needed for my noisy industrial sensor setup — no more false triggers. Both channels click cleanly and the 5V operation works perfectly with my existing power supply.

Wired this into a 5V Arduino project and the two independent channels with their own NO/COM/NC contacts made hooking up two separate loads dead simple. The optocoupler protection is a nice peace-of-mind touch, and it’s been switching cleanly for a week straight without a hiccup.

The optical coupler isolation gives me peace of mind when switching a 12V pump, and the screw terminals make wiring a breeze. Worked perfectly right out of the box for my Arduino project.