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Interfacing of 3-Axis Gyroscope Sensor BMG160 With Particle

In today’s world, more than half of the youth and kids are fond of gaming and all those who are fond of it, fascinated by the technical aspects of gaming knows the importance of motion sensing in this domain. We were also amazed by the same thing and just to bring it on the boards, we thought of working on a gyroscope sensor that can measure the angular rate of any object. So, the sensor we took up to deal with the task is BMG160. BMG160 is a 16-bit, digital, triaxial, gyroscope sensor which can measure the angular rate in three perpendicular room dimensions.

In this tutorial, we are going to demonstrate the working of BMG160 with Particle Photon.

Step 1: BMG160 Overview:

First of all, we would like to familiarize you with the basic features of the sensor module that is BMG160 and the communication protocol on which it works.

BMG160 is basically a 16-bit, digital, triaxial, gyroscope sensor which can measure angular rates. It is capable of computing angular rates in three perpendicular room dimensions, the x, y and z-axis, and providing the corresponding output signals. It can communicate with the raspberry pi board using the I2C communication protocol. This particular module is designed to meet requirements for consumer applications as well as industrial purposes.

The communication protocol on which the sensor works is I2C. I2C stands for the inter-integrated circuit. It is a communication protocol in which the communication takes place through SDA(serial data) and SCL(serial clock) lines. It allows connecting multiple devices at the same time. It is one of the simplest and most efficient communication protocol.

Step 2: What You Need..!!

The materials that we need for accomplishing our goal includes the following hardware components:

1. BMG160

2. Particle Photon

3. I2C Cable

4. I2C Shield For Particle Photon

Step 3: Hardware Hookup:

The hardware hookup section basically explains the wiring connections required between the sensor and the Particle. Ensuring correct connections is the basic necessity while working on any system for the desired output. So, the requisite connections are as follows:

The BMG160 will work over I2C . Here is the example wiring diagram, demonstrating how to wire up each interface of the sensor.

Out-of-the-box, the board is configured for an I2C interface, as such, we recommend using this hookup if you’re otherwise agnostic.

All you need is four wires! Only four connections are required Vcc, Gnd, SCL and SDA pins and these are connected with the help of I2C cable.

These connections are demonstrated in the pictures above.

Step 4: 3-Axis Gyroscope Measurement Particle Code:

Let’s start with the particle code now.

While using the sensor module with the particle, we include application.h and spark_wiring_i2c.h library. “application.h” and spark_wiring_i2c.h library contains the functions which facilitate the i2c communication between the sensor and the particle.

The entire particle code is given below for the convenience of the user:

// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// BMG160
// This code is designed to work with the BMG160_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Gyro?sku=BMG160_I2CS#tabs-0-product_tabset-2

#include 
#include 

// BMG160 I2C address is 0x68(104)
#define Addr 0x68

int xGyro = 0, yGyro = 0, zGyro = 0;
void setup() 
{
    // Set variable
    Particle.variable("i2cdevice","BMG160");
    Particle.variable("xGyro",xGyro);
    Particle.variable("yGyro",yGyro);
    Particle.variable("zGyro",zGyro);

    // Initialise I2C communication as MASTER 
    Wire.begin();
    // Initialise Serial Communication
    Serial.begin(9600);
    
    // Start I2C Transmission
    Wire.beginTransmission(Addr);
    // Select Range register
    Wire.write(0x0F);
    // Configure full scale 2000 dps
    Wire.write(0x80);
    // Stop I2C Transmission
    Wire.endTransmission();
    
    // Start I2C Transmission
    Wire.beginTransmission(Addr);
    // Select Bandwidth register
    Wire.write(0x10);
    // Set Bandwidth = 200 Hz
    Wire.write(0x04);
    // Stop I2C Transmission
    Wire.endTransmission();
    delay(300);
}

void loop()
{
    unsigned int data[6];
    // Start I2C Transmission
    Wire.beginTransmission(Addr);
    // Select data register
    Wire.write(0x02);
    // Stop I2C Transmission
    Wire.endTransmission();
    // Request 6 bytes of data
    Wire.requestFrom(Addr, 6);
    // Read 6 bytes of data
    // xGyro lsb, xGyro msb, yGyro lsb, yGyro msb, zGyro lsb, zGyro msb
    if(Wire.available() == 6)
    {
        data[0] = Wire.read();
        data[1] = Wire.read();
        data[2] = Wire.read();
        data[3] = Wire.read();
        data[4] = Wire.read();
        data[5] = Wire.read();
    }
    delay(300);

    // Convert the data
    xGyro = ((data[1] * 256) + data[0]);
    if (xGyro > 32767)
    {
        xGyro -= 65536;
    }
    yGyro = ((data[3] * 256) + data[2]);
    if (yGyro > 32767)
    {
        yGyro -= 65536;
    }
    zGyro = ((data[5] * 256) + data[4]);
    if (zGyro > 32767)
    {
        zGyro -= 65536;
    }
    
    // Output data to dashboard
    Particle.publish("X-Axis of Rotation :",  String(xGyro));
    delay(1000);
    Particle.publish("Y-Axis of Rotation :",  String(yGyro));
    delay(1000);
    Particle.publish("Z-Axis of Rotation :",  String(zGyro));
    delay(1000);
}          


Step 5: Applications:

BMG160 has a varied number of applications in devices like cell phones, human-machine interface devices. This sensor module has been designed to meet requirements for consumer applications such as image stabilization(DSC and camera-phone), gaming and pointing devices. It is also employed in systems which require gesture recognition and the systems used in indoor navigation.

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