SparkFun Arduino UNO R4 WiFi Qwiic Kit Hookup Guide

Contributors: Ell C
Favorited Favorite 1

Example 5: Triple Axis Accelerometer Breakout - BMA400 (Qwiic)

Library Installation

The SparkFun BMA400 Arduino Library is based off the API for the sensor from Bosch to let users get started reading data from the sensor and using the various interrupt options. Install the library through the Arduino Library Manager tool by searching for "SparkFun BMA400". Users who prefer to manually install the library can download a copy of it from the GitHub repository by clicking the button below:

Hardware Hookup

Plug one end of the Qwiic connector into the Qwiic port on the breakout board, and the other end into the Qwiic connector on the Arduino Uno R4 WiFi board like so:

Plug one end of the qwiic connector into the qwiic port on the breakout board, and the other end into the qwiic connector on the Arduino Uno R4 WiFi board

Software Example

This example demonstrates how to set the BMA400 up to communicate basic motion data over I2C.

#include <Wire.h>
#include "SparkFun_BMA400_Arduino_Library.h"

// Create a new sensor object
BMA400 accelerometer;

// I2C address selection
uint8_t i2cAddress = BMA400_I2C_ADDRESS_DEFAULT; // 0x14
//uint8_t i2cAddress = BMA400_I2C_ADDRESS_SECONDARY; // 0x15

void setup()
    // Start serial
    Serial.println("BMA400 Example 1 - Basic Readings I2C");

    // Initialize the I2C library

    // Check if sensor is connected and initialize
    // Address is optional (defaults to 0x14)
    while(accelerometer.beginI2C(i2cAddress, Wire1) != BMA400_OK)
        // Not connected, inform user
        Serial.println("Error: BMA400 not connected, check wiring and I2C address!");

        // Wait a bit to see if connection is established

    Serial.println("BMA400 connected!");

void loop()
    // Get measurements from the sensor. This must be called before accessing
    // the acceleration data, otherwise it will never update

    // Print acceleration data
    Serial.print("Acceleration in g's");
    Serial.print("X: ");
    Serial.print(, 3);
    Serial.print("Y: ");
    Serial.print(, 3);
    Serial.print("Z: ");
    Serial.println(, 3);

    // Pause

Select your Board and Port and click Upload. Open the serial monitor after the upload completes with the baud set to 115200 to watch motion data print out.

Example output of the BMA400 in the serial monitor

Move the sensor around in different directions and watch the acceleration data change with the motion.