Overview
Things
Story

Required Library
Gyro Sensor & Bluetooth Sensor
Code Explanation

Schematics
Code
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Published October 11, 2017

Makers (Cubecon) #2 Gyro Sensor & Bluetooth

A Bongilcheon High School Makers club's team project.

BeginnerWork in progress1 hour4,249

Makers (Cubecon) #2 Gyro Sensor & Bluetooth

Things used in this project

Hardware components

Arduino Nano R3

Breadboard (generic)

Arduino MPU-6050

HC-06 Bluetooth Module

Arduino RGB LED

Software apps and online services

Arduino IDE

Story

We combined the gyro sensor and the Bluetooth sensor. Two Bluetooth sensors are needed because two Arduinos need to communicate with each other.

Also, one of the Bluetooth sensors must be a master and one slave. The HC-06 Bluetooth sensor is recommended because it can be set as the master and slave.

Required Library

Wire

SoftwareSerial

Gyro Sensor & Bluetooth Sensor

Place the master of the Bluetooth sensor on the breadboard having a gyro sensor.

The color of the RGB LED changes according to the gyro value, and the color of the RGB LED on the other side via the Bluetooth communication is also changed.

1 / 4

Depending on the gyro value, the two RGB LED colors change normally.

Code Explanation

Measure Gyro Values - Refer to the above site

Bluetooth Communication

SoftwareSerial name(RX, TX);

Declares the RX pins and TX pins for use with the name and Bluetooth communications.

Example:

SoftwareSerial btSerial(7, 8);

Set the name to btSerial, Bluetooth TX = Arduino D7 pins (RX), Bluetooth RX = Arduino D8 pins (TX).

btSerial.begin(9600);

Set serial communication speed for Bluetooth.

Bluetooth Master

btSerial.write('A');

Transmits letter A.

Bluetooth Slave

byte data;

Declares a variable called data.

data = btSerial.read();

Saves the read character to the data.

Code

#include<Wire.h>
#include<SoftwareSerial.h>

SoftwareSerial btSerial(7, 8);

const int MPU_addr = 0x68; 
int16_t GyX, GyY, GyZ; 
int red = 6;
int green = 5;
int blue = 4;

void setup() {
  Wire.begin(); 
  Wire.beginTransmission(MPU_addr); 
  Wire.write(0x6B);  
  Wire.write(0); 
  Wire.endTransmission(true); 
  Serial.begin(9600);
  btSerial.begin(9600);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
}

void loop() {
  gyro();
  led();
}

void gyro() {
  Wire.beginTransmission(MPU_addr);
  Wire.write(0x3B); 
  Wire.endTransmission(false);
  Wire.requestFrom(MPU_addr, 14, true);
  GyX = Wire.read() << 8|Wire.read(); 
  GyY = Wire.read() << 8|Wire.read(); 
  GyZ = Wire.read() << 8|Wire.read();
  GyX = GyX / 100; 
  GyY = GyY / 100;
  GyZ = GyZ / 100;
  Serial.print(F("gyro x,y,z : "));
  Serial.print("| GyX = ");
  Serial.print(GyX);
  Serial.print("| GyY = ");
  Serial.print(GyY);
  Serial.print("| GyZ = ");
  Serial.print(GyZ);
  Serial.println();
  delay(300);
}

void led() {
    if (GyX >= -20 && GyX <= -10) {
    if (GyY >= -10 && GyY <= 0) {
    if (GyZ >= 145 && GyZ <= 155) {
      btSerial.write('A');
      digitalWrite(red, HIGH);
      digitalWrite(green, HIGH);
      digitalWrite(blue, HIGH);
  }
  }
  }
    else if (GyX >= 0 && GyX <= 10) {
    if (GyY >= -175 && GyY <= -165) {
    if (GyZ >= -20 && GyZ <= -10) {
      btSerial.write('B');
      digitalWrite(red, HIGH);
      digitalWrite(green, LOW);
      digitalWrite(blue, LOW);
  }
  }
  }
    else if (GyX >= 165 && GyX <= 175) {
    if (GyY >= -10 && GyY <= 0) {
    if (GyZ >= 10 && GyZ <= 20) {
      btSerial.write('C');
      digitalWrite(red, LOW);
      digitalWrite(green, HIGH);
      digitalWrite(blue, LOW);
  }
  }
  }
    else if (GyX >= -155 && GyX <= -145) {
    if (GyY >= -5 && GyY <= 5) {
    if (GyZ >= -40 && GyZ <= -30) {
      btSerial.write('D');
      digitalWrite(red, LOW);
      digitalWrite(green, LOW);
      digitalWrite(blue, HIGH);
  }
  }
  }
  else {
    btSerial.write('X');
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
  }
}

#include <SoftwareSerial.h>

SoftwareSerial btSerial(7, 8);

int red = 6;
int green = 5;
int blue = 4;

void setup() {
  Serial.begin(9600);
  btSerial.begin(9600);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
}
void loop() {
  byte data;
  data = btSerial.read();
  if(data == 'A') {
    digitalWrite(red, HIGH);
    digitalWrite(green, HIGH);
    digitalWrite(blue, HIGH);
  }
  else if(data == 'B') {
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
  }
  else if(data == 'C') {
    digitalWrite(red, LOW);
    digitalWrite(green, HIGH);
    digitalWrite(blue, LOW);
  }
  else if(data == 'D') {
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(blue, HIGH);
  }
  else if(data == 'X') {
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
  }
}