Chain MIC ESPHome Component

Chain MIC is a sound acquisition node in the M5Stack Chain series. It integrates a GMI4015P-2C microphone, an SGM321YC5/TR operational amplifier, and a programmable RGB LED, and supports 12-bit ADC sampling of sound signals and threshold triggering. It is suitable for ambient sound detection, voice-controlled interaction, device status prompts, and other applications.

Note

To use Chain series nodes, a compatible host is required for UART communication and control, such as the Chain DualKey host, or an Atom series device paired with the Atomic ToChain Base.

1. Component Overview

Item	Information
Expansion module	Chain MIC (U226)
Main functions	Provides sound acquisition data
Communication interface	Chain Bus / UART
ESPHome components	`m5_chain_base`, `m5_chain_mic` (external components)
ESPHome version requirement	2026.9.0 or later

2. Component Details

Include External Components

Configuration Example

Configure the host UART pins (using the Chain DualKey as an example)

uart:
  - id: chain_uart_right
    tx_pin: GPIO6
    rx_pin: GPIO5
    baud_rate: 115200

  - id: chain_uart_left
    tx_pin: GPIO47
    rx_pin: GPIO48
    baud_rate: 115200 

Include the external components

external_components:
  - source: github://m5stack/esphome@feat-m5-chain
    components: [m5_chain_base, m5_chain_mic]
    refresh: 0s 

Add the Chain MIC

m5_chain_mic:
  id: chain_mic
  uart_id: chain_uart_right
  chain_index: 1
  update_interval: 250ms 

Note

Set the correct index according to the actual position of the Chain.

Add the Chain MIC sound threshold binary sensor

binary_sensor:
  - platform: m5_chain_mic
    m5_chain_mic_id: chain_mic
    name: Chain MIC Threshold 

Add Chain MIC ADC sensors for volume

sensor:
  - platform: m5_chain_mic
    m5_chain_mic_id: chain_mic
    name: Chain MIC ADC
    type: adc_12
  - platform: m5_chain_mic
    m5_chain_mic_id: chain_mic
    name: Chain MIC ADC 8 bit
    type: adc_8 

Add the Chain MIC RGB LED

output:
  - platform: m5_chain_mic
    id: chain_mic_red
    m5_chain_mic_id: chain_mic
    channel: rgb_red
  - platform: m5_chain_mic
    id: chain_mic_green
    m5_chain_mic_id: chain_mic
    channel: rgb_green
  - platform: m5_chain_mic
    id: chain_mic_blue
    m5_chain_mic_id: chain_mic
    channel: rgb_blue

light:
  - platform: rgb
    name: "Chain MIC Light"
    red: chain_mic_red
    green: chain_mic_green
    blue: chain_mic_blue 

3. Reference Example

After the Chain MIC expansion module is connected, you can view the corresponding Sensor and Light entities on the device page:

Dashboard card example

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