4-channel-relay
There are 2 repositories under 4-channel-relay topic.
allenxiang/gt-esp32
Home brew ESP32 curity panel with 4 channel relay, 19 channel GPIO, bluetooth, wifi, ethernet, screw terminals.
ShahariarRabby/Blynk-Home-Automation
Controlling the lights in your house using your voice is a great way to dip your toes into the smart homeworld. And if you already have a smartphone you can build your own smart switch using a few bucks.