Unit AC Measure ESPHome Component

The Unit AC Measure component reads parameters such as AC voltage, current, active power, and accumulated energy consumption.

1. Component Overview

Item	Information
Product Name	Unit AC Measure
SKU	U164
Main Function	AC voltage, current, power, and energy measurement
Communication Interface	I2C
Default I2C Address	`0x42`
ESPHome Component	`unit_acmeasure` (external component)
ESPHome Version Requirement	`2026.2.2` and later

2. Component Description

Including the External Component

M5Stack External Component - unit_acmeasure

Add the External Components configuration to the YAML file to load the unit_acmeasure sensor driver.

external_components:
  - source: github://m5stack/esphome-yaml/components
    components: [unit_acmeasure]
    refresh: 0s 

Sensor Configuration

Add the Sensor component to enable sensor entities for AC measurements.

sensor:
  - platform: unit_acmeasure
    id: acmeasure1
    address: 0x42
    update_interval: 2s
    voltage:
      name: AC Voltage
    current:
      name: AC Current
    power:
      name: Active Power
    apparent_power:
      name: Apparent Power
    power_factor:
      name: Power Factor
    energy:
      name: Energy 

3. Reference Example

yaml 
external_components:
  - source: github://m5stack/esphome-yaml/components
    components: [unit_acmeasure]
    refresh: 0s

i2c:
  sda: GPIOXX
  scl: GPIOXX
  scan: true

sensor:
  - platform: unit_acmeasure
    id: acmeasure1
    address: 0x42
    update_interval: 2s
    voltage:
      name: AC Voltage
    current:
      name: AC Current
    power:
      name: Active Power
    apparent_power:
      name: Apparent Power
    power_factor:
      name: Power Factor
    energy:
      name: Energy

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