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Small green circuit board 1.4 by .7 inches with microcontroller chip and pin headers

Adafruit

Adafruit ItsyBitsy 32u4 5V 16MHz engineering development tool

SKU CH-JKPR-FHC88

Compact Arduino-compatible microcontroller board with native USB HID support, 16MHz clock, 17 digital pins and 28K flash memory

  • TypeEngineering Development Tools
  • ATmega32u4 chip delivers Arduino Leonardo compatibility
  • Native USB enables HID keyboard, mouse, MIDI or CDC serial roles
  • 5 V logic at 16 MHz with 2 KB RAM and 28 KB flash
  • Compact 1.4" × 0.7" board still provides 17 digital plus 6 analog pins
  • More reliable bootloader and USB debugging than earlier Pro Trinket 5 V

Compact Arduino-compatible board

The ItsyBitsy 32u4 5V 16MHz is a tiny microcontroller board built around the ATmega32u4 chip in a QFN package. It runs at 5V logic with a 16MHz clock and provides 2KB of RAM plus 28K of flash memory. The board measures 1.4" by 0.7" and exposes 6 power pins, 6 analog & digital pins and 17 digital pins for a dense I/O count in a very small footprint.

Makers shrinking prototypes

This board suits developers who have validated a design on a larger Arduino and now need to shrink the finished project without losing pin count or USB capability. It is less suited for builders who need more storage or extra hardware peripherals beyond what the ATmega32u4 provides.

Native USB HID support

The ATmega32u4 includes native USB, so the board can enumerate as a HID keyboard, mouse, MIDI device or CDC serial port on any computer without an external USB-to-serial converter. This single feature decides whether the board fits a project that must talk directly to a host over USB.

Pluspunten

  • ATmega32u4 chip delivers Arduino Leonardo compatibility
  • Native USB enables HID keyboard, mouse, MIDI or CDC serial roles
  • 5 V logic at 16 MHz with 2 KB RAM and 28 KB flash
  • Compact 1.4" × 0.7" board still provides 17 digital plus 6 analog pins
  • More reliable bootloader and USB debugging than earlier Pro Trinket 5 V

Specificaties

TypeEngineering Development Tools

Vragen over dit artikel

Which ItsyBitsy 32u4 version should I pick for a 5V project?

This board runs at 5V logic and 16MHz, matching an Arduino Uno or Leonardo, so existing 5V shields and code work without level shifting.

What does the 16MHz clock mean for real‑time tasks?

It executes 16 million cycles per second, giving deterministic timing for motor control, audio sampling or bit‑banged protocols on the 17 digital pins.

How does the native USB interface limit what I can build?

The ATmega32u4 presents itself directly as a HID keyboard, mouse, MIDI or CDC serial device, so no extra USB‑to‑serial chip is needed and the board enumerates on any host.

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