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Microcontroller
Waveshare RP2040-Zero
An ultra-compact RP2040 breakout from Waveshare with castellated pads on three edges, a USB-C connector, onboard WS2812 RGB LED, and BOOT/RESET buttons.
Processor
RP2040 dual-core Arm Cortex-M0+
Logic
3.3 V GPIO
Power
USB-C or 5V pad
Format
Ultra-compact castellated module (23.5 × 18 mm)
Check before wiring
- GPIO is 3.3 V only.
- GP23, GP24, GP25 are accessible only via test points, not castellated pads.
- No onboard LiPo charger or battery connector.
Interfaces
GPIOI2CSPIUARTADCPWMUSB
Source-backed connector
Interactive pin map
Pin map
Connector
Castellated pads on three 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.
- RP2040 at 133 MHz; pin data from the Waveshare RP2040-Zero wiki.
- GPIO is 3.3 V only and not 5 V tolerant.
- Onboard WS2812 RGB LED is on GP16 (not exposed as a pad).
- GP23, GP24, GP25 are used internally and are only accessible via test points.
- ADC_VREF is tied to 3.3 V and is not exposed as a separate pad.
All 23 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| Left/bottom edge (GP0–GP15) | ||||
| 1 | UART | UART0 | UART0 TX | |
| 2 | UART | UART0 | UART0 RX | |
| 3 | GPIO | |||
| 4 | GPIO | |||
| 5 | I2C | I2C0 | I2C0 SDA | |
| 6 | I2C | I2C0 | I2C0 SCL | |
| 7 | GPIO | |||
| 8 | GPIO | |||
| 9 | SPI | SPI1 | SPI1 RX | |
| 10 | SPI | SPI1 | SPI1 CS | |
| 11 | SPI | SPI1 | SPI1 SCK | |
| 12 | SPI | SPI1 | SPI1 TX | |
| 13 | GPIO | |||
| 14 | GPIO | |||
| 15 | GPIO | |||
| 16 | GPIO | |||
| Bottom-right edge (GP26–GP29) | ||||
| 17 | ADC | ADC0 | ||
| 18 | ADC | ADC1 | ||
| 19 | ADC | ADC2 | ||
| 20 | ADC | ADC3 | ||
| Top edge | ||||
| 21 | Power | 5V | ||
| 22 | Ground | GND | ||
| 23 | Power | 3V3 | ||
Why it matters
- Waveshare wiki documents every pad label and alternate function.
- Onboard WS2812 RGB LED on GP16 without using a pad.
- Three-edge castellated pads allow direct PCB soldering.
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