Multiway Switching 4 Lite Bulbs Simultaneously Via Smartphone!

If you lot hollo upwards the article I did on the single smart relay switch, at that topographic point is directly an expanded version of this board that is likewise based on the ESP​8266 WiFi module but packs fifty-fifty to a greater extent than extra cool features such every bit DC ability connectivity, 4 relays alongside optoisolators, 3.3V regulator, USB​ to ​UART​ converter, NodeMCU header for connecting OLED displays, every bit good every bit an LED for GPIO LED test.
The functionality of the single-way relay switch was already bang-up for controlling lite bulbs remotely via an​ android phone. But now, alongside the four-way relay switch board you lot tin laissez passer the axe connect fifty-fifty to a greater extent than sensors to the board in addition to command 4 lite bulbs at the same time.
The 4 relay board likewise features a 100-230V​ ​/5V AC​/​​D​​​​C ability render to connect the board straight to mains electricity, 2 headers for connecting digital sensors, every bit good every bit a USB​ to ​UART​ converter onboard for programming the ​ESP​8266 to your liking.
By the way, it's non simply light-bulbs you lot tin laissez passer the axe control. You'll likewise hold upwards able to utilization a WiFi smart ability strip alongside 4 sockets in addition to 4 two-way switches to command dissimilar appliances inwards parallel alongside each other, then you lot tin laissez passer the axe plow on i appliance without having to plow on the others.