How to Use Arduino nano 33 BLE sense Rev 2: Examples, Pinouts, and Specs

The Arduino Nano 33 BLE Sense Rev 2 is a compact and versatile microcontroller board designed for advanced IoT and wearable applications. Manufactured by Arduino, this board features Bluetooth Low Energy (BLE) capabilities, a powerful ARM Cortex-M4 processor, and a suite of integrated sensors. Its small form factor and robust processing power make it ideal for projects requiring wireless communication, environmental sensing, and machine learning at the edge.

• IoT (Internet of Things) devices and smart home automation
• Wearable technology and fitness trackers
• Environmental monitoring (e.g., temperature, humidity, air quality)
• Machine learning and AI-based edge computing
• Robotics and gesture recognition
• Prototyping BLE-enabled devices

The following table outlines the key technical details of the Arduino Nano 33 BLE Sense Rev 2:

The Arduino Nano 33 BLE Sense Rev 2 features a standard pinout. Below is a table describing the key pins:

1. Powering the Board:

   • Connect the board to a computer or USB power source using a micro-USB cable.
   • Alternatively, supply 5V to the VIN pin and connect GND to ground.

2. Programming the Board:

   • Install the Arduino IDE and add the "Arduino nRF528x Boards" package via the Board Manager.
   • Select "Arduino Nano 33 BLE Sense" as the board in the IDE.
   • Write your code and upload it to the board via the USB connection.

3. Using Sensors:

   • The board includes multiple sensors (e.g., temperature, humidity, microphone). Use the appropriate libraries (e.g., Arduino_LSM9DS1 for motion sensors) to interface with them.

4. BLE Communication:

   • Use the ArduinoBLE library to create BLE peripherals or central devices.
   • Define BLE characteristics and services to send or receive data wirelessly.

• Voltage Levels: Ensure all connected components operate at 3.3V logic levels to avoid damaging the board.
• Power Supply: Avoid exceeding the 5V input voltage on the VIN pin.
• Heat Management: While the board is efficient, prolonged high-performance tasks may generate heat. Ensure proper ventilation.
• Sensor Calibration: Some sensors may require calibration for accurate readings. Refer to the respective sensor library documentation.
• BLE Range: The BLE range may vary depending on environmental factors. Test in the intended environment for optimal performance.

Below is an example of how to read temperature data from the onboard sensor and send it via BLE:

#include <ArduinoBLE.h>
#include <Arduino_HTS221.h> // Library for the onboard temperature sensor

BLEService tempService("1809"); // BLE Temperature Service
BLEFloatCharacteristic tempCharacteristic("2A6E", BLERead | BLENotify);

void setup() {
  Serial.begin(9600);
  while (!Serial);

  // Initialize BLE
  if (!BLE.begin()) {
    Serial.println("Failed to initialize BLE!");
    while (1);
  }
  Serial.println("BLE initialized.");

  // Initialize temperature sensor
  if (!HTS.begin()) {
    Serial.println("Failed to initialize temperature sensor!");
    while (1);
  }
  Serial.println("Temperature sensor initialized.");

  // Set up BLE service and characteristic
  BLE.setLocalName("Nano33BLE_Temp");
  BLE.setAdvertisedService(tempService);
  tempService.addCharacteristic(tempCharacteristic);
  BLE.addService(tempService);

  // Start advertising
  BLE.advertise();
  Serial.println("BLE advertising started.");
}

void loop() {
  // Listen for BLE connections
  BLEDevice central = BLE.central();

  if (central) {
    Serial.print("Connected to central: ");
    Serial.println(central.address());

    while (central.connected()) {
      // Read temperature and update BLE characteristic
      float temperature = HTS.readTemperature();
      tempCharacteristic.writeValue(temperature);

      Serial.print("Temperature: ");
      Serial.print(temperature);
      Serial.println(" °C");

      delay(1000); // Update every second
    }

    Serial.println("Central disconnected.");
  }
}

1. Board Not Recognized by the IDE:

   • Ensure the correct board and port are selected in the Arduino IDE.
   • Update the USB drivers if necessary.

2. BLE Connection Fails:

   • Verify that the BLE central device supports Bluetooth 5.0.
   • Reduce interference by testing in a less crowded wireless environment.

3. Sensors Not Responding:

   • Check that the required libraries are installed and included in the code.
   • Ensure the board is powered correctly and not in a low-power state.

4. Overheating:

   • Avoid running intensive tasks for extended periods without proper ventilation.

Q: Can I use the board with a 5V sensor?
A: No, the board operates at 3.3V logic levels. Use a level shifter to interface with 5V sensors.

Q: What is the maximum BLE range?
A: The BLE range is approximately 10–30 meters, depending on environmental conditions.

Q: Does the board support Wi-Fi?
A: No, the Nano 33 BLE Sense Rev 2 only supports Bluetooth Low Energy (BLE) and NFC.

Q: Can I use this board for machine learning?
A: Yes, the board is compatible with TensorFlow Lite for Microcontrollers, enabling on-device ML applications.