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Microcontroller
Adafruit ItsyBitsy RP2040
A compact RP2040 stick board with more exposed pins than QT Py-style boards and official CircuitPython support.
Processor
RP2040 dual-core Arm Cortex-M0+
Logic
3.3 V GPIO
Power
Micro-USB, BAT, USB, 3V
Format
36 x 18 mm stick
Check before wiring
- GPIO is not 5 V tolerant.
- Use the Adafruit label map instead of assuming Raspberry Pi Pico positions.
- No battery charger is included despite battery-related pads.
Interfaces
GPIOI2CSPIUARTADCPWMUSB
Source-backed connector
Interactive pin map
Pin map
Connector
ItsyBitsy RP2040 castellated edges
Signals grouped by function — schematic layout, not to physical scale
Dense header — open Full view for a roomier, fully-labelled diagram.
Simplified diagram, grouped by function — not to physical scale. Pin data is source-backed; verify against the linked documentation.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- Official Adafruit pinout groups the board by bottom, top, and short edges.
- GPIO is 3.3 V and not 5 V tolerant.
- Adafruit notes D5 is output-only and level-shifted to VHI.
All 28 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| Bottom edge | ||||
| 1 | System | |||
| 2 | Power | 3V3 | ||
| 3 | Power | 3V3 | ||
| 4 | Power | VHI | ||
| 5 | ADC | |||
| 6 | ADC | |||
| 7 | ADC | |||
| 8 | ADC | |||
| 9 | GPIO | |||
| 10 | GPIO | |||
| 11 | SPI | SPI | ||
| 12 | SPI | SPI | ||
| 13 | SPI | SPI | ||
| Top edge | ||||
| 14 | GPIO | |||
| 15 | GPIO | |||
| 16 | GPIO | |||
| 17 | GPIO | |||
| 18 | GPIO | |||
| 19 | GPIO | |||
| 20 | Alt | Output-only and level-shifted to VHI. | ||
| 21 | I2C | I2C | ||
| 22 | I2C | I2C | ||
| 23 | UART | UART | ||
| 24 | UART | UART | ||
| Short edge | ||||
| 25 | System | |||
| 26 | GPIO | |||
| 27 | GPIO | |||
| 28 | GPIO | |||
Why it matters
- Official pinout maps ItsyBitsy labels to RP2040 GPIO numbers.
- Small footprint still exposes many useful pads.
- Works well for embedded USB and PIO experiments.
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