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Microcontroller · Development Board
Wio Terminal
A SAMD51-based handheld with LCD, buttons, IMU, mic, and a Raspberry Pi-compatible 40-pin connector, used for portable dashboards and TinyML demos.
Processor
Microchip ATSAMD51P19 Arm Cortex-M4F @ 120 MHz
Logic
3.3 V GPIO
Power
USB-C or battery chassis
Format
Handheld terminal with 2.4-inch LCD and Pi-style 40-pin port
Check before wiring
- Wireless runs on a separate RTL8720 with its own firmware that may need updating before Wi-Fi works.
- 40-pin port is 3.3 V logic; it can plug into Pi accessories but is not a Pi GPIO clone.
- Some GPIOs are shared with the LCD, SD card, and internal sensors.
Interfaces
GPIOI2CSPIUARTADCDACPWMUSBWi-FiBluetooth
Source-backed connector
Interactive pin map
Pin map
Connector
40-pin Raspberry Pi-compatible header
Component side up, 40-pin GPIO header along the top edge
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- The Wio Terminal maps SAMD51 signals to Raspberry Pi-style BCM labels shown in Seeed's official pinout.
- SAMD51 GPIO is 3.3 V and is not 5 V tolerant; pins 2 and 4 are 5 V power rails only.
- Several signals have alternate analog, DAC, PWM, and I2S functions; check the runtime's board definition before combining functions.
All 40 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Power | 3V3 | ||
| 3 | I2C | I2C1 | I2C1 SDA | |
| 5 | I2C | I2C1 | I2C1 SCL | |
| 7 | GPIO | GPCLK0 | ||
| 9 | Ground | GND | ||
| 11 | DAC | DAC0 | ||
| 13 | ADC | D0 / A0 / PWM0 | ||
| 15 | ADC | D1 / A1 | ||
| 17 | Power | 3V3 | ||
| 19 | SPI | SPI | SPI MOSI | |
| 21 | SPI | SPI | SPI MISO | |
| 23 | SPI | SPI | SPI SCLK / PWM2 | |
| 25 | Ground | GND | ||
| 27 | I2C | I2C0 | I2C0 SDA | |
| 29 | GPIO | GPCLK1 | ||
| 31 | GPIO | GPCLK2 | ||
| 33 | ADC | D6 / A6 / PWM3 | ||
| 35 | Alt | I2S | I2S LRCLK | |
| 37 | ADC | D8 / A8 / PWM4 | ||
| 39 | Ground | GND | ||
| 2 | Power | 5V | ||
| 4 | Power | 5V | ||
| 6 | Ground | GND | ||
| 8 | UART | UART | TXD | |
| 10 | UART | UART | RXD | |
| 12 | Alt | I2S | I2S BCLK | |
| 14 | Ground | GND | ||
| 16 | ADC | D2 / A2 / PWM1 | ||
| 18 | ADC | D3 / A3 | ||
| 20 | Ground | GND | ||
| 22 | ADC | D4 / A4 | ||
| 24 | SPI | SPI | SPI CS / CE0 | |
| 26 | DAC | SPI | CE1 / DAC1 | |
| 28 | I2C | I2C0 | I2C0 SCL | |
| 30 | Ground | GND | ||
| 32 | ADC | D5 / A5 | ||
| 34 | Ground | GND | ||
| 36 | ADC | D7 / A7 | ||
| 38 | Alt | I2S | I2S SDIN | |
| 40 | Alt | I2S | I2S SDOUT |
Why it matters
- Rear 40-pin port follows Raspberry Pi physical pin spacing for sharing accessories.
- Wiki documents the full pinout and onboard peripherals.
- Wireless via onboard RTL8720DN coprocessor.
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