Adafruit ItsyBitsy ESP32 - PCB Antenna (8MB Flash 2MB PSRAM)

Board
by Adafruitadafruit-itsybitsy-esp32≈ cheap (under ~$15)
Verify my boardCompareEdit on GitHub
Adafruit ItsyBitsy ESP32 - PCB Antenna (8MB Flash 2MB PSRAM) board
Board
Adafruit ItsyBitsy ESP32 - PCB Antenna (8MB Flash 2MB PSRAM) pinout
Pinout

Specifications

Radiosinherited from ESP32

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 4.2
Bluetooth Classic
yes
802.15.4
no

USB

Native USB
no
Connector
micro-usb

Board

Form factor
itsybitsy
Dimensions
36 × 17.6 mm
Battery connector
yes
Charging
no

Display & extras

Extras
rgb-ledstemma-qt
Built onAdafruit ItsyBitsy ESP32 - PCB Antenna (8MB Flash 2MB PSRAM) BoardESP32 SoC

Small-form ESP32 board with Micro USB, RGB NeoPixel, STEMMA QT, and 8 MB flash / 2 MB PSRAM.

Firmware for this board

No firmware recipes yet — help add one.

Notes

  • 8 MB flash, 2 MB PSRAM
  • Built-in USB-to-serial converter with auto-reset over Micro USB; bridge chip model not named on the product page (omitted)
  • Battery input pads on underside with diode protection for external packs up to 6V; no onboard charging circuit
  • io.gpio_exposed=20 QUOTED: vendor page states "The ItsyBitsy ESP32 has 20 general purpose 'IO' pins."
  • io.gpio_free=14 DERIVED, not quoted (SPEC-io-power.md §5.3). Pinouts page gives explicit GPIO numbers for all 20 header pins (bottom row: GPIO25/26/4/38/37/36/19/21/22; top row: GPIO13/12/14/33/32/7/5/27/15/20/8). Subtracting esp32's soc.reserved_pins that are exposed among those 20 -- strapping {5,12,15} (3), input_only {36} (1), usb_flash_tied {7,8} (2) -- gives 20 - 6 = 14. Math not vendor-stated; verify before treating as exact.
  • io.power_out QUOTED: vendor page states "You can draw 500mA whether powered by USB or battery."

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for Adafruit ItsyBitsy ESP32 - PCB Antenna (8MB Flash 2MB PSRAM) — over Web Serial, no backend, nothing leaves your browser.

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Serial monitor

Not connected.