ESP32

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Adafruit HUZZA32

  • board available from DigiKey quantity "hundreds" ~CAD$35
 https://www.digikey.ca/product-detail/en/adafruit-industries-llc/3405/1528-2181-ND/7244967
 https://www.digikey.ca/product-detail/en/adafruit-industries-llc/3591/1528-2514-ND/8119805
  - USB power connector
  - connection for external 3.7 V battery, charged from USB
  - serial IO 3.3V RX+TX
  - 1x SPI (where is the rest?)
  - 1x I2C (where is the rest?)
  - 7 GPIO top, shared with 2 DACs and 6 ADCs
  - 7 GPIO bottom, shared with 7 ADCs and other functions
  - everything is 3.3V, *NOT* 5V safe
  - there is ADC1 and ADC2, not clear what it means, ADC voltage range not clear
  - ADC1 or ADC2 cannot be used with Wifi (this is unclear)
  - ESP32 SD card interface not connected
  - ESP32 serial IO connected to USB via USB-serial-bridge chip (the best I can tell)
  - power is USB with battery backup, one header pin provides regulated 3.3 V power to user (available current not clear, maybe 250 mA)
, battery voltage is on A13

ESP-WROOM-32 module

Information from adafruit: https://www.adafruit.com/product/3405 and https://learn.adafruit.com/adafruit-huzzah32-esp32-feather

  - 240 MHz CPU, 520 kbytes SRAM, Wifi, Bluetooth, 4 Mbyte flash, interface for SD card.
  - 3x UART
  - 3x SPI
  - 2x I2C
  - 12 ADC inputs
  - 2 DAC
  - more goodies
  - everything is 3.3V, *NOT* 5V safe