AZDelivery 4 Channel Relay Module DC 5V with Optocoupler Low-Level Trigger Relay Shield Board Compatible with Arduino Including E-Book!

Worked exactly as expected. Tested with with Arduino to control some Christmas LED lights. I want to move onto some home device control with other types of ESP266 & ESP32 boards and ultimately Alexa voice control. I would recommend using the option to connect external power to the circuits as it wouldn't take much to damage the arduino if too much current is drawn.I have ordered a few products from AZ Delivery lately and have been happy with the speed of delivery, packaging and the E-books for the products. will continue to use them as my knowledge grows in this area.

Board was used to reverse the polarity of the track supply to a model railway as well as completely isolating it.The relay terminals are excellent. One possible improvement would be some sort of polarity key on the 6 way signal connector which can be connected either way round.

Using for lighting control. good air gap separation of 5v components and relay pins. sturdy relay pins. works well with Wemos D1 mini.