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Microcontroller

During development, Adafruit ESP32-S3 Feather was primarily used but also SparkFun Thing Plus to test an older hardware version that offers faster analog to digital conversion.

ESP Variants

ESP 8266

  • released in 2014
  • L106 32-bit RISC microprocessor core based on the Tensilica
  • 32kBytes RAM
  • IEEE 802.11 b/g/n Wi-Fi
  • I2C, I2S, SPI
  • Low quality A/D
  • $3.50

ESP32

  • released in 2016
  • about 100 times faster than ESP8266
  • Xtensa dual-core (or single-core) 32-bit LX6 microprocessor
  • Wi-Fi: 802.11 b/g/n
  • Bluetooth: v4.2 BR/EDR and BLE (shares the radio with Wi-Fi)
  • I2C, SPI, I2S
  • A2DP (Bluetooth Classic)
  • Low quality A/D
  • $5.50

ESP32-C3

  • released in 2020
  • 32-bit RISC-V-based single-core
  • 400kBytes
  • Bluetooth Low Energy 21dB
  • WiFi 2.4GHz 54Mbit/s
  • 22 GPIO pins
  • Low quality A/D
  • Does not support A2DP (Bluetooth Classic)
  • I2S performance might be low
  • $6.50

ESP32-S3

  • released 2020
  • Xtensa dual-core 32-bit, 240MHz
  • 512kBytes
  • Bluetooth Low Energy 20dB (smaller is better)
  • WiFi 2.4GHz 54Mbit/s
  • 45 GPIO pins
  • Low quality A/D
  • Does not supprt A2DP (Bluetooh Classic)
  • Likely will BLE Audio will not be usable
  • Arduino Library support for I2S is in beta
  • Arduino-Audio-Tools does not support AudioStream?
  • $11.50

ESP32-C6

  • released in 2023
  • Arduino IDE support with ESP Arduino version 3.0 and later
  • RISC-V dual core 32-bit 160MHz
  • WiFi 6
  • Bluetooth LE 5
  • Zigbeee
  • 8 Mbytes
  • Has I2S peripheral
  • $10

Teensy Variants

Teensy 4.x based

  • ARM Cortex-M7 at 600 MHz
  • I2C, SPI, I2S, Ethernet
  • Precision A/D
  • Fastest Microcontroller, about 7 x ESP32

Teensy 4.0

  • Micro USB
  • 2Mbytes
  • $23.80

Teensy 4.1

  • Micro USB
  • FlashCard
  • 8Mbytes
  • $31.50

Development Boards

SparkFun Thing Plus - ESP32 WROOM

  • USB type C or micro
  • Single Core
  • 16Mytes SPI Flash
  • Lipoly battery connector
  • Built-in battery charging when powered over USB-C/micro
  • STEMMA Q connector for i2c devices
  • $24.95

Adafruit ESP32-S3 Feather

  • USB type C or Lipoly battery
  • Built-in battery charging when powered over USB-C
  • STEMMA Q connector for i2c devices
  • $17.50

Adafruit QT Py ESP32-S3 WiFi Dev Board with STEMMA QT

  • USB type C
  • STEMMA Q connector for i2c devices
  • Tiny
  • will not work with I2S (sound)
  • $12.50

Arduino Nano ESP32 (S3)

  • USB-C
  • $20