Adafruit ItsyBitsy 32u4 - 3V 8MHz
Compact Arduino-compatible board with ATmega32u4 running at 3.3V and 8 MHz, with native USB HID support. Smaller footprint than a Feather but more pins than a Trinket. 3.3V logic; not 5V tolerant.
Compact Arduino-compatible board with ATmega32u4 running at 3.3V and 8 MHz, with native USB HID support. Smaller footprint than a Feather but more pins than a Trinket. 3.3V logic; not 5V tolerant.
One grouped connection is listed in the table but omitted from the graphic until individual pins are available.
| Pin | Position | Type |
|---|---|---|
| GPIO #0-#13, A0-A5, SCKMOSIMISO, SCLSDA | logic pins | I2C, SPI, Signal |
| Other (pin 13 LED etc) | misc | Signal |
One grouped connection is omitted from the graphic until individual pins are available.
USB · 3.3 V
Confirm the data interface matches your host board.
Module pins: 3V / GND / BAT / USB / EN / RST / ARef, GPIO #0-#13, A0-A5, SCK/MOSI/MISO, SCL/SDA, Other (pin 13 LED etc). Schematik maps them to your board in the app.
Specialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.
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