New house iot project

[Horlagold]

Please help me choose and recommend devices for my home automations

Six water leak sensor
Two Humidity sensor
Two temperature sensor

A device that can control 
three way or four way light switch
One doorbell chime
One energy meter

[admin]

which software you want to use？ home assistant or tuya app?

[Horlagold]

I’m using Home Assistant

[admin]

you can chose KC868-Server (install home assitant) + KC868-A series board according to your load channel.

[Horlagold]

Okay. How will I wire a 3 way light switch to connect to the KC868 A8 board

[admin]

connect to KC868-A8's digital input ports.

[Horlagold]

Thanks. I want to control of a three or four way light switch with a relay switch controlled by KC868-A8s. Do you have a product such as  item “D” in my diagram a “smart relay switch”or recommend a wiring solution to control a digital smart relay switch. I have attached the diagram below.

[admin]

sorry, i don't understand you , what you want to do?

[Horlagold]

How do I add KinCony products to control a 3 way light switch

[admin]

do you want use 3 switch buttons control one relay (lamp)?