For temperature measurement in Home Assistant, there are a variety of different sensors and ways to integrate them. When using Zigbee, for example, Aquara sensors are available, but these have a decisive disadvantage: the battery. It has to be replaced after 2 years at the latest. A cost-effective and more robust alternative to battery-powered sensors is provided by an ESP32 microcontroller. With the right wiring, a single microcontroller can measure the temperature and/or humidity of all possible rooms in a house. Purely for a temperature measurement ,DS18B20 temperature sensors could be used. If you want to measure humidity as well as temperature, you can useDHT11 or DHT22 sensors.

[Link Pending]

Wiring

ESP Home Project

esphome:
  name: esp
  friendly_name: esp

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:


# Enable Home Assistant API
api:
  encryption:
    key: "???"

ota:
  platform: esphome
  password: "???"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Test Fallback Hotspot"
    password: "???"

sensor:
  - platform: dht
    pin: GPIO33
    temperature:
      name: "Room1 Temperature"
    humidity:
      name: "Room1 Humidity"
    update_interval: 60s

captive_portal:
    

Incorporated in HA:

Conclusion

Placed relatively centrally, a single ESP32 microcontroller can provide a variety of sensors. In my house, an ESP32 in the boiler room ensures that in addition to the temperature values of the heating system, I can also record the outside temperature and the temperature and humidity values of certain rooms. Furthermore, the microcontroller monitors the water flow of the heating and controls it via a relay board.