Specifications:
- Same size and form-factor as the rest of the ItsyBitsy family and nearly-identical pinout
- RP2040 32-bit Cortex M0+ dual core running at ~125 MHz @ 3.3V logic and power
- 264 KB RAM
- 8 MB SPI FLASH chip for storing files and CircuitPython/MicroPython code storage. No EEPROM
- 23 GPIO pins
- Four 12 bit ADCs (one more than Pico)
- Two I2C, Two SPI and two UART peripherals, we label one for the 'main' interface in standard ItsyBitsy locations
- The 10 digital 'non-ADC/non-peripheral' GPIO are consecutive for maximum PIO compatibility
- Pin #11 red LED for general purpose blinking
- RGB NeoPixel with power pin on GPIO so you can depower it for low power usages.
- Both Reset button and Bootloader select button for quick restarts (no unplugging-replugging to relaunch code)
- 3.3V regulator with 500mA peak current output
- 3.3V Power/enable pin
- Power with either USB or external output (such as a battery) - it'll automatically switch over
- Broken-out SWD pins for debug access
- 12 MHz crystal for perfect timing.
- Special Vhigh output pin gives you the higher voltage from VBAT or VUSB, for driving NeoPixels, servos, and other 5V-logic devices.
- Digital 5 level-shifted output for high-voltage logic level output.
- USB Micro B connector lets you access built-in ROM USB bootloader and serial port debugging
- Measures 1.4" x 0.7" x 0.2" (36mm x 18mm x 4mm) without headers soldered in

Tutorial
Arduino IDE support