esphome/tests/components/mmc5603/test.esp32.yaml

i2c:
  - id: i2c_mmc5603
    scl: 16
    sda: 17

sensor:
  - platform: mmc5603
    address: 0x30
    field_strength_x:
      name: HMC5883L Field Strength X
    field_strength_y:
      name: HMC5883L Field Strength Y
    field_strength_z:
      name: HMC5883L Field Strength Z