Recent changes in ESPHome have altered the configuration for 1-wire and Dallas temp sensors. Since there is no example config for using multiple 1-wire busses with sensors on each of them, I thought I would post an example here. Multiple 1-wire busses are useful where you have multiple sensors on long wires connected to a single ESP device. Even with a lower (2K2) pull-up resistor, it is still possible to suffer from read errors.

one_wire:
  - platform: gpio
    pin: GPIO5
    id: bus1
  - platform: gpio
    pin: GPIO4
    id: bus2
  - platform: gpio
    pin: GPIO0
    id: bus3

sensor:
  - platform: dallas_temp
    one_wire_id: bus1
    name: t1

  - platform: dallas_temp
    one_wire_id: bus2
    name: t2

  - platform: dallas_temp
    one_wire_id: bus3
    name: t3