AmbM8
AmbM8 (short for Ambisonic Mate) is a budget-ish (about £40 in parts) 4-in / 2-out audio interface built around the ESP32-P4 and the PCM1865. It works as a proper USB interface with a computer, as a mass-storage card reader, and entirely standalone as a recorder / player with its intuitive(ish) E-Paper UI.
Overview
- USB audio (UAC2): 4-ch capture to host over high-speed USB, stereo playback for headphones.
- Standalone recording: 24-bit WAV to SD: 4-ch@48kHz or 2-ch@192kHz, with optional WXYZ encoding.
- Standalone playback: file browser + player from SD, with APO-format EQ.
- Live monitor: ambisonic (A-format) to binaural decoding
- USB mass storage (MSC): Switch to SD mode to download the files from the Device.
- UI: 1.54" E-INK display with intuitive(ish) controls
Hardware:
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Why?
Look up the price of a 4-channel USB interface… Go on… want with similar specs…? £222 ? Works for you? No…?
For about £40. If you can make it, it is the cheapest thing in it’s class by a lot.
Documentation
Required Components
- ESP32-P4: AliExpress Link
- PCM1865DBTR: AliExpress Link
- SMD Resistors Set (0805 36Values 720PCS): AliExpress Link
- SMD Capacitors Set (0805 720PCS): AliExpress Link
- ESP32-C3 (ESP32 C3 Supermini): AliExpress Link
- WeAct 1.54" Epaper Module: AliExpress Link
- EC11 Encoder: AliExpress Link
- 665MM Mute Switch: AliExpress Link
- SD/TF Card Slot: AliExpress Link
- 3X6X3.5MM Micro Switch: AliExpress Link
- 3.5 MM Audio Jack: AliExpress Link
- WeAct I2S Earphone Module PCM5100A: AliExpress Link
- WS2812B: AliExpress Link
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