This is my house full of ESPHome devices... I really don't know how many are there already, but around 15.
There are 4 outside, two in the living room, 1 in the kitchen, upstairs there is 1 on the hall and 1 on each room + 1 for every AC unit.
Many of them are connected to Arduinos via I2C and the Arduino Port Expander (https://esphome.io/cookbook/arduino_port_extender.html) thinghy, those controls relays boards (the common one which comes with 4 relays)
Everything is DIY hardware too, no sonoff here.
I do have to admit I have a few H801 RGBWW Led controllers, which uses the ESP8266 inside.
I not only use ESPHome but I also develop and contribute for ESPHome for more than a year already, helping Otto as much as I can. So you will find here many test yaml programs which I write to test code I write or maintain.
I've created a few components
- DF Player
- SIM800L Sms Sender
- TM1637 display
- Coolix climate (contributed a bit on the climate stuff)
- AC Dimmer, this one started by Otto but really put some effort there, seems to be working
I also maintain the VSCode plugin
Hope this helps!