# Arduino Nicla Voice

> Tiny 22.86mm AI voice module with nRF52840 BLE 5.0, Syntiant NDP120 neural decision processor, MEMS microphone, 6-axis IMU, and magnetometer — runs always-on voice recognition and audio anomaly detection at ultra-low power.

## Quick Facts

- **Brand:** Arduino
- **Board Type:** module
- **Price:** ~$50
- **Product Readiness:** developer
- **CPU:** ARM Cortex-M4F @ 64MHz,Syntiant NDP120
- **CPU Architecture:** ARM Cortex-M4F
- **CPU Cores:** 1
- **RAM:** 256KB SRAM
- **Flash:** 1MB
- **USB:** Micro-USB
- **Power:** 3.3V via Micro-USB or battery
- **Operating Voltage:** 3.3V
- **Dimensions:** 22.86 × 22.86mm
- **Weight:** 2g
- **Antenna:** Built-in PCB antenna
- **SD Card:** No

## Connectivity

- **Bluetooth:** BLE 5.0

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** No

## Compatible Firmware

arduino

## Use Cases

- voice-assistant
- wearable
- industrial-iot

## Components

- **nRF52840** (mcu): Nordic nRF52840 at 64MHz with BLE 5.0 for application logic and wireless communication. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Finfocenter.nordicsemi.com%2Fpdf%2FnRF52840_PS_v1.1.pdf&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)
- **NDP120** (mcu): Syntiant NDP120 ultra-low-power neural processor for always-on voice recognition, keyword spotting, and audio event classification. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.syntiant.com%2Fndp120&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)
- **BMI270** (accelerometer): Bosch BMI270 6-axis IMU with accelerometer and gyroscope. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.bosch-sensortec.com%2Fmedia%2Fboschsensortec%2Fdownloads%2Fdatasheets%2Fbst-bmi270-ds000.pdf&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)
- **MP34DT06JTR** (microphone): STMicroelectronics MP34DT06JTR omnidirectional MEMS microphone with PDM output. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fdatasheet%2Fmp34dt06j.pdf&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)

## Protocols

- **SPI**: notes: Via castellated pads
- **I2C**: notes: Via castellated pads

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| GPIO0 | Digital I/O |  | digital-input, digital-output |
| GPIO1 | Digital I/O |  | digital-input, digital-output |
| GPIO2 | Digital I/O |  | digital-input, digital-output |
| GPIO3 | Digital I/O |  | digital-input, digital-output |

## Description

## Overview

The Arduino Nicla Voice is a miniature (22.86×22.86mm) AI-powered module that combines always-on voice recognition with motion sensing. At its core is the Syntiant NDP120 neural decision processor, which runs multiple AI algorithms simultaneously at microwatt-level power consumption, enabling continuous keyword detection and audio classification without draining the battery.

The nRF52840 ARM Cortex-M4F handles BLE 5.0 communication and application logic, while the onboard MEMS microphone captures audio and the BMI270 6-axis IMU + BMM150 magnetometer provide motion and orientation data. This combination enables voice commands, sound classification (glass breaking, machinery failure), gesture recognition, and compass heading in a package smaller than a coin.

Compatible with Nicla, Portenta, and MKR product lines, the Nicla Voice is designed for wearables, retrofit sensors, and standalone battery-powered AI devices where always-on intelligence in minimal form factor is essential.

## Where to Buy

- [Arduino Store (US)](https://openhardware.directory/r?to=https%3A%2F%2Fstore-usa.arduino.cc%2Fproducts%2Fnicla-voice&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export) — $50.00
- [Arduino Store (EU)](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Fnicla-voice&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export) — €55.30
- [DigiKey](https://openhardware.directory/r?to=https%3A%2F%2Fwww.digikey.com%2Fen%2Fproducts%2Fdetail%2Farduino%2FABX00061%2F18075935&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export) — $55.00
- [Mouser](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mouser.com%2FProductDetail%2FArduino%2FABX00061&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export) — $55.00

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Fnicla-voice&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fhardware%2Fnicla-voice%2F&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)
- [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2FABX00061-datasheet.pdf&ref=openhardware.directory&product=arduino-nicla-voice&source=md-export)

## Tags

`arduino`, `nicla`, `ai`, `voice`, `nrf52840`, `ble`, `tinyml`, `microphone`

## Images

![Arduino Nicla Voice](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-nicla-voice/d493ec32751d.jpg)

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