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Microcontroller
Arduino Nano 33 BLE Sense
A compact BLE and TinyML-friendly Arduino with onboard sensors that made it a common choice in teaching demos and embedded ML labs.
Processor
Nordic nRF52840
Logic
3.3 V GPIO
Power
Micro-USB, VIN, 3.3 V rail
Format
Nano module with sensors
Check before wiring
- End-of-life status matters for new procurement.
- Not 5 V tolerant despite the Arduino name.
Interfaces
GPIOI2CSPIUARTADCPWMUSBBluetooth
Source-backed connector
Interactive pin map
Pin map
Connector
Arduino Nano dual 15-pin headers
USB at top, component side up, headers on both long edges
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.
- Standard Arduino Nano form factor; nRF52840 ports from the official Arduino pinout PDF.
- GPIO is 3.3 V only and is not 5 V tolerant; max 15 mA output / 5 mA input per pin.
- No true DAC. SDA=A4 (P0.31), SCL=A5 (P0.02). Onboard sensors share the internal I2C bus.
- Left header positions 1-15, right header positions 16-30.
All 30 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | SPI | SPI | P0.13 | |
| 2 | Power | 3V3 | ||
| 3 | Alt | analog reference | ||
| 4 | ADC | P0.04 | ||
| 5 | ADC | P0.05 | ||
| 6 | ADC | P0.30 | ||
| 7 | ADC | P0.29 | ||
| 8 | I2C | I2C | P0.31 | |
| 9 | I2C | I2C | P0.02 | |
| 10 | ADC | P0.28 | ||
| 11 | ADC | P0.03 | ||
| 12 | Power | 5V | off unless VBUS solder jumper bridged | |
| 13 | System | |||
| 14 | Ground | GND | ||
| 15 | Power | VIN | 5-21 V input | |
| 16 | SPI | SPI | P1.08 · MISO | |
| 17 | SPI | SPI | P1.01 · MOSI | |
| 18 | PWM | P1.02 | ||
| 19 | PWM | P0.27 | ||
| 20 | PWM | P0.21 | ||
| 21 | PWM | P0.23 | ||
| 22 | PWM | P1.14 | ||
| 23 | PWM | P1.13 | ||
| 24 | PWM | P1.15 | ||
| 25 | PWM | P1.12 | ||
| 26 | GPIO | P1.11 | ||
| 27 | Ground | GND | ||
| 28 | System | |||
| 29 | UART | UART | P1.03 | |
| 30 | UART | UART | P1.10 |
Why it matters
- Onboard sensors reduce wiring for machine-learning demos.
- Official docs include an interactive pinout and cheat sheet.
- Good reference for 3.3 V Nano-family projects.
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