guid.foo / sound-machine
A nightstand noise generator based on M5Stack Atom Echo and integrating with Home Assistant
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sound-machine / reference / atom-echo / pinmap.md
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Chris Guidry Initial commit
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Atom Echo (C008-C / "Atom Voice") Pin Map#

Speaker + Microphone#

ESP32 Pin Component Function
G22 NS4168 amp I2S DATA
G19 NS4168 amp I2S BCLK
G33 NS4168 amp I2S LRCK
G23 SPM1423 mic PDM CLK
G33 SPM1423 mic PDM DATA

Note: G33 is shared between the amp's LRCK and the mic's DATA line — this is why the stock firmware can't record and play simultaneously (confirmed in community docs). Not a problem for our use case (output only), but something to remember if the design ever wants local wake-word.

Human interface#

ESP32 Pin Component Function
G27 SK6812 RGB LED Data
G39 Button Input (input-only pin)

GROVE connector (HY2.0-4P)#

Pin Color Signal
1 Black GND
2 Red 5V
3 Yellow G26
4 White G32

Reserved pins — do not reuse#

From the M5Stack docs (pinmap section):

"G19 / G22 / G23 / G33 have been predefined. Do not reuse these pins; otherwise the Atom Echo may be damaged."

Available for external hardware#

  • GROVE: G26, G32 (plus 5V / GND)
  • Button G39 is reusable if we want a different button function

Key takeaways for this project#

  • I2S output for our external DAC: route to free pins (G26/G32 on GROVE, plus one more — likely borrowed from the side header) rather than the reserved G19/G22/G33. This avoids driving the NS4168 entirely. See disabling-internal-speaker.md.
  • NS4168 shutdown: not needed — just don't send it I2S data (software-only solution in ESPHome, no hardware mod).
  • Button on G39 is our "start/stop bedtime routine" trigger.
  • RGB LED on G27 is a nice status indicator (idle / playing / HA unreachable / etc.)
  • GROVE G26/G32 can be used for I2S out to the external DAC, or repurposed for a secondary input.

Sources#