Day 8- Bluetooth HC05 & Make Bluetooth APP
Task
1) Bluetooth HC 05 introduction
2) Bluetooth car
3) How to Make Android App using Mit app Inventor
4) 4 ch Bluetooth Home Automation
HC-05 Bluetooth Module
HC-05 is a Bluetooth device used for wireless communication with Bluetooth enabled devices (like smartphone). It communicates with microcontrollers using serial communication (USART).
Default settings of HC-05 Bluetooth module can be changed using certain AT commands.
As HC-05 Bluetooth module has 3.3 V level for RX/TX and microcontroller can detect 3.3 V level, so, there is no need to shift TX voltage level of HC-05 module. But we need to shift the transmit voltage level from microcontroller to RX of HC-05 module.
For more information about HC-05 Bluetooth module and how to use it, refer the topic HC-05 Bluetooth module in the sensors and modules section.
Send Message using Bluetooth HC-05 With Arduino
Here, we will transmit data from Smartphone via Bluetooth to the Arduino Uno and display it on Serial Monitor of PC.
Download and install a Bluetooth terminal application on your phone and use it to connect to the HC-05 Bluetooth module.
Data is sent from the Smartphone using the Bluetooth terminal application.
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#include<SoftwareSerial.h>
/* Create object named bt of the class SoftwareSerial */
SoftwareSerial bt(2,3); /* (Rx,Tx) */
void setup() {
bt.begin(9600); /* Define baud rate for software serial communication */
Serial.begin(9600); /* Define baud rate for serial communication */
Serial.println(" Ready for bt communication");
}
void loop() {
if (bt.available()) /* If data is available on serial port */
{
Serial.write(bt.read()); /* Print character received on to the serial monitor */
Serial.println("");
}
}
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How to make Bluetooth app
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How To Make Bluetooth CAR
//Arduino Bluetooth Controlled Car//
// Before uploading the code you have to install the necessary library//
//AFMotor Library https://learn.adafruit.com/adafruit-motor-shield/library-install //
#include <AFMotor.h>
//initial motors pin
AF_DCMotor motor1(1, MOTOR12_1KHZ);
AF_DCMotor motor2(2, MOTOR12_1KHZ);
AF_DCMotor motor3(3, MOTOR34_1KHZ);
AF_DCMotor motor4(4, MOTOR34_1KHZ);
char command;
int frontlights=14;
int backlights=15;
int horn=16;
int extra=17;
int speedx=255;
void setup()
{
pinMode(frontlights,OUTPUT);
pinMode(backlights,OUTPUT);
pinMode(horn,OUTPUT);
pinMode(extra,OUTPUT);
digitalWrite(frontlights,LOW);
digitalWrite(backlights,LOW);
digitalWrite(horn,LOW);
digitalWrite(extra,LOW);
Serial.begin(9600); //Set the baud rate to your Bluetooth module.
Serial.print("Bluetooth Car Ready");
}
void loop(){
if(Serial.available() > 0){
command = Serial.read();
Stop(); //initialize with motors stoped
//Change pin mode only if new command is different from previous.
Serial.println(command);
switch(command){
case 'F': forward(); break;
case 'B': back(); break;
case 'L': left(); break;
case 'R': right(); break;
case 'G': fleft(); break;
case 'I': fright(); break;
case 'H': bleft(); break;
case 'J': bright(); break;
case 'W':
digitalWrite(frontlights,HIGH);
break;
case 'w':
digitalWrite(frontlights,LOW);
break;
case 'U':
digitalWrite(backlights,HIGH);
break;
case 'u':
digitalWrite(backlights,LOW);
break;
case 'V':
digitalWrite(horn,HIGH);
break;
case 'v':
digitalWrite(horn,LOW);
break;
case 'X':
digitalWrite(extra,HIGH);
break;
case 'x':
digitalWrite(extra,LOW);
break;
case '1': Serial.print("speed= 150");speedx=150; break;
case '2': Serial.print("speed= 160");speedx=160; break;
case '3': Serial.print("speed= 170");speedx=170; break;
case '4': Serial.print("speed= 180");speedx=180; break;
case '5': Serial.print("speed= 190");speedx=190; break;
case '6': Serial.print("speed= 200");speedx=200; break;
case '7': Serial.print("speed= 225");speedx=225; break;
case '8': Serial.print("speed= 235");speedx=235; break;
case '9': Serial.print("speed= 245");speedx=245; break;
case 'q': Serial.print("speed= 255");speedx=255; break;
}
}
}
void forward()
{
motor1.setSpeed(speedx); //Define maximum velocity
motor1.run(FORWARD); //rotate the motor clockwise
motor2.setSpeed(speedx); //Define maximum velocity
motor2.run(FORWARD); //rotate the motor clockwise
motor3.setSpeed(speedx);//Define maximum velocity
motor3.run(FORWARD); //rotate the motor clockwise
motor4.setSpeed(speedx);//Define maximum velocity
motor4.run(FORWARD); //rotate the motor clockwise
}
void fright()
{
motor1.setSpeed(speedx-(speedx/2)); //Define maximum velocity
motor1.run(FORWARD); //rotate the motor clockwise
motor2.setSpeed(speedx-(speedx/2)); //Define maximum velocity
motor2.run(FORWARD); //rotate the motor clockwise
motor3.setSpeed(speedx);//Define maximum velocity
motor3.run(FORWARD); //rotate the motor clockwise
motor4.setSpeed(speedx);//Define maximum velocity
motor4.run(FORWARD); //rotate the motor clockwise
}
void fleft()
{
motor1.setSpeed(speedx); //Define maximum velocity
motor1.run(FORWARD); //rotate the motor clockwise
motor2.setSpeed(speedx); //Define maximum velocity
motor2.run(FORWARD); //rotate the motor clockwise
motor3.setSpeed(speedx-(speedx/2));//Define maximum velocity
motor3.run(FORWARD); //rotate the motor clockwise
motor4.setSpeed(speedx-(speedx/2));//Define maximum velocity
motor4.run(FORWARD); //rotate the motor clockwise
}
void back()
{
motor1.setSpeed(speedx); //Define maximum velocity
motor1.run(BACKWARD); //rotate the motor anti-clockwise
motor2.setSpeed(speedx); //Define maximum velocity
motor2.run(BACKWARD); //rotate the motor anti-clockwise
motor3.setSpeed(speedx); //Define maximum velocity
motor3.run(BACKWARD); //rotate the motor anti-clockwise
motor4.setSpeed(speedx); //Define maximum velocity
motor4.run(BACKWARD); //rotate the motor anti-clockwise
}
void bright()
{
motor1.setSpeed(speedx-(speedx/2)); //Define maximum velocity
motor1.run(BACKWARD); //rotate the motor anti-clockwise
motor2.setSpeed(speedx-(speedx/2)); //Define maximum velocity
motor2.run(BACKWARD); //rotate the motor anti-clockwise
motor3.setSpeed(speedx); //Define maximum velocity
motor3.run(BACKWARD); //rotate the motor anti-clockwise
motor4.setSpeed(speedx); //Define maximum velocity
motor4.run(BACKWARD); //rotate the motor anti-clockwise
}
void bleft()
{
motor1.setSpeed(speedx); //Define maximum velocity
motor1.run(BACKWARD); //rotate the motor anti-clockwise
motor2.setSpeed(speedx); //Define maximum velocity
motor2.run(BACKWARD); //rotate the motor anti-clockwise
motor3.setSpeed(speedx-(speedx/2)); //Define maximum velocity
motor3.run(BACKWARD); //rotate the motor anti-clockwise
motor4.setSpeed(speedx-(speedx/2)); //Define maximum velocity
motor4.run(BACKWARD); //rotate the motor anti-clockwise
}
void right()
{
motor1.setSpeed(speedx); //Define maximum velocity
motor1.run(BACKWARD); //rotate the motor anti-clockwise
motor2.setSpeed(speedx); //Define maximum velocity
motor2.run(BACKWARD); //rotate the motor anti-clockwise
motor3.setSpeed(speedx); //Define maximum velocity
motor3.run(FORWARD); //rotate the motor clockwise
motor4.setSpeed(speedx); //Define maximum velocity
motor4.run(FORWARD); //rotate the motor clockwise
}
void left()
{
motor1.setSpeed(speedx); //Define maximum velocity
motor1.run(FORWARD); //rotate the motor clockwise
motor2.setSpeed(speedx); //Define maximum velocity
motor2.run(FORWARD); //rotate the motor clockwise
motor3.setSpeed(speedx); //Define maximum velocity
motor3.run(BACKWARD); //rotate the motor anti-clockwise
motor4.setSpeed(speedx); //Define maximum velocity
motor4.run(BACKWARD); //rotate the motor anti-clockwise
}
void Stop()
{
motor1.setSpeed(0); //Define minimum velocity
motor1.run(RELEASE); //stop the motor when release the button
motor2.setSpeed(0); //Define minimum velocity
motor2.run(RELEASE); //rotate the motor clockwise
motor3.setSpeed(0); //Define minimum velocity
motor3.run(RELEASE); //stop the motor when release the button
motor4.setSpeed(0); //Define minimum velocity
motor4.run(RELEASE); //stop the motor when release the button
}
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Bluetooth App for Home Automation
Download aia file
Download Apk file
#include <Wire.h>
char Received;
const int LED1=4;
const int LED2=5;
const int LED3=6;
const int LED4=7;
void setup() {
Serial.begin(9600); /* Define baud rate for software serial communication */
pinMode(LED1,OUTPUT);
pinMode(LED2,OUTPUT);
pinMode(LED3,OUTPUT);
pinMode(LED4,OUTPUT);
digitalWrite(LED1,0);
digitalWrite(LED2,0);
digitalWrite(LED3,0);
digitalWrite(LED4,0);
Serial.begin(9600); /* Define baud rate for serial communication */
Serial.println(" Ready for bt communication");
}
void loop() {
if(Serial.available()>0)
{
Received = Serial.read();
Serial.println(Received);
}
if (Received =='a'){Serial.println("Relay 2 OFF"); digitalWrite(LED1,HIGH); Received ='o'; delay(250);}
if (Received =='A'){Serial.println("Relay 2 ON"); digitalWrite(LED1, LOW); Received ='o'; delay(250);}
if (Received =='b'){Serial.println("Relay 3 OFF"); digitalWrite(LED2,HIGH); Received ='o'; delay(250);}
if (Received =='B'){Serial.println("Relay 3 ON"); digitalWrite(LED2, LOW); Received ='o'; delay(250);}
if (Received =='c'){Serial.println("Relay 4 OFF"); digitalWrite(LED3, HIGH); Received ='o'; delay(250);}
if (Received =='C'){Serial.println("Relay 4 ON"); digitalWrite(LED3, LOW); Received ='o'; delay(250);}
if (Received =='d'){Serial.println("Relay 5 OFF"); digitalWrite(LED4,HIGH); Received ='o'; delay(250);}
if (Received =='D'){Serial.println("Relay 5 ON"); digitalWrite(LED4, LOW); Received ='o'; delay(250);}
if (Received =='z'){
Serial.println("Relay 2 OFF"); digitalWrite(LED1, HIGH); delay(100);
Serial.println("Relay 3 OFF"); digitalWrite(LED2, HIGH); delay(100);
Serial.println("Relay 4 OFF"); digitalWrite(LED3, HIGH); delay(100);
Serial.println("Relay 5 OFF"); digitalWrite(LED4, HIGH); delay(100); Received ='o';}
if (Received =='Z'){
Serial.println("Relay 2 ON"); digitalWrite(LED1, LOW); delay(100);
Serial.println("Relay 3 ON"); digitalWrite(LED2, LOW); delay(100);
Serial.println("Relay 4 ON"); digitalWrite(LED3, LOW); delay(100);
Serial.println("Relay 5 ON"); digitalWrite(LED4, LOW); delay(100); Received ='o';}
delay(10);
}
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