Atomic Audio-3.5 Base ESPHome Component

This page describes the audio output and amplifier control configuration for Atomic Audio-3.5 Base in ESPHome. The base must be used with a compatible Atom-series controller.

1. Component Overview

Item	Information
Product Name	Atomic Audio-3.5 Base
SKU	A166
Main Function	Audio decoding, speaker output, and amplifier control
Communication Interface	I2C, I2S
ESPHome Components	`es8311` (external), `i2s_audio`, `speaker`, `pi4ioe5v6408`
ESPHome Version	`2026.4.0` or later

2. Component Details

External Component Integration

M5Stack External Component - es8311

The reference configuration uses the M5Stack external es8311 component, loaded through external_components:

external_components:
  - source: github://m5stack/esphome-yaml/components@main
    components: [es8311]
    refresh: 1d 

Official Component Integration

I2S Audio Output

Configure the I2S bus, the ES8311 DAC, and the speaker output. The pins below correspond to the AtomS3R and Atomic Audio-3.5 Base connections.

i2s_audio:
  - id: audio_i2s_bus
    i2s_lrclk_pin: GPIO6
    i2s_bclk_pin: GPIO8

audio_dac:
  - platform: es8311
    id: audio_dac
    i2c_id: audio_i2c_bus
    bits_per_sample: 16bit
    sample_rate: 48000
    use_microphone: false
    use_mclk: false

speaker:
  - platform: i2s_audio
    id: audio_speaker
    i2s_audio_id: audio_i2s_bus
    i2s_dout_pin: GPIO5
    dac_type: external
    audio_dac: audio_dac
    sample_rate: 48000
    channel: left 

Speaker Amplifier

The base uses PI4IOE5V6408 to control the speaker amplifier enable signal. After creating a switch entity, you can control the amplifier state from Home Assistant.

pi4ioe5v6408:
  - id: audio_io_expander
    i2c_id: audio_i2c_bus
    address: 0x43

switch:
  - platform: gpio
    name: "Speaker Enable"
    id: speaker_enable
    pin:
      pi4ioe5v6408: audio_io_expander
      number: 0
      mode:
        output: true
    restore_mode: RESTORE_DEFAULT_ON 

3. Example

AtomS3R + Atomic Audio-3.5 Base Applications

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