Outline; Esp32 Pico - M5Stack AtomU Manual

1. OUTLINE

AtomU is a very small and flexible IoT speech recognition development board,
using Espressif's `ESP32` main control chip, equipped with two low-power `Xtensa®
32-bit LX6` microprocessors, main frequency Up to `240MHz`. It has the characteristics
of compact size, strong performance and low power consumption. Integrated USB-A
interface, plug and play, easy to upload, download and debug the program. Integrated
`Wi-Fi` and `Bluetooth` modules, with built-in digital microphone SPM1423 (I2S), can
achieve clear audio recording, suitable for various IoT human-computer interaction,
voice input recognition scenarios (STT)

1.1. ESP32 PICO

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The ESP32-PICO-D4 is a System-in-Package (SiP) module that is based on ESP32, providing
complete Wi-Fi and Bluetooth functionalities. The module has a size as small as (7.000±0.100)
mm × (7.000±0.100) mm × (0.940±0.100) mm, thus requiring minimal PCB area. The module
integrates a 4-MB SPI flash. At the core of this module is the ESP32 chip*, which is a single 2.4
GHz Wi-Fi and Bluetooth combo chip designed with TSMC's 40 nm ultra-low power