Lecture

1. Arduino & HC-05 Bluetooth Module

2. Bluetooth Module
Preliminary Hardware / Software
Bluetooth Module – Arduino Uno
Connectivity

3. ARDUINO & HC-05 BT Module
HC – 05 Bluetooth Module
- Master or Slave Configuration
- Breakout board recommended
- Bluetooth SPP (Serial Port Protocol) module
- Serial Communication

4. • Hardware Components needed:
– HC-05 Bluetooth Module
– Arduino Board
– Breadboard and Jump Wires
• Circuit Schematics
– Here’s how we need to connect the module to the Arduino Board.

5. • Arduino Source Code
#define ledPin 7
int state = 0;
void setup() {
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
Serial.begin(38400); // Default communication rate of the Bluetooth module
}
void loop() {
if(Serial.available() > 0){ // Checks whether data is coming from the serial port
state = Serial.read(); // Reads the data from the serial port
}
if (state == '0') {
digitalWrite(ledPin, LOW); // Turn LED OFF
Serial.println("LED: OFF"); // Send back, to the phone, the String "LED: ON"
state = 0;
}
else if (state == '1') {
digitalWrite(ledPin, HIGH);
Serial.println("LED: ON");
state = 0;
}
}

6. • Connecting the Smartphone to the HC-05 Bluetooth Module and the Arduino

7. • Connecting the Smartphone to the HC-05 Bluetooth Module and the Arduino

8. • Controlling Arduino Using a Laptop or PC via Bluetooth Communication

9. • Processing IDE Source Code
import processing.serial.*;
Serial myPort;
String ledStatus="LED: OFF";
void setup() {
size(450, 500);
myPort = new Serial(this, "COM5", 38400); // Starts the serial communication
myPort.bufferUntil ('n'); // Defines up to which character the data from the serial port will be read. The character
'n' or 'New Line'
}
void serialEvent (Serial myPort) { // Checks for available data in the Serial Port
ledStatus = myPort.readStringUntil('n'); //Reads the data sent from the Arduino (the String "LED: OFF/ON) and it
puts into the "ledStatus" variable
}
void draw() {
background(237, 240, 241);
fill(20, 160, 133); // Green Color
stroke(33);
strokeWeight(1);
rect(50, 100, 150, 50, 10); // Turn ON Button
rect(250, 100, 150, 50, 10); // Turn OFF Button
fill(255);

10. • Processing IDE Source Code - Continued
textSize(32);
text("Turn ON",60, 135);
text("Turn OFF", 255, 135);
textSize(24);
fill(33);
text("Status:", 180, 200);
textSize(30);
textSize(16);
text("Program made by (Studen Name),n CPE Program", 80, 320);
text(ledStatus, 155, 240); // Prints the string coming from the Arduino
// If the button "Turn ON" is pressed
if (mousePressed && mouseX>50 && mouseX<200 && mouseY>100 && mouseY<150){
myPort.write('1'); // Sends the character '1' and that will turn on the LED
// Highlighs the buttons in red color when pressed
stroke(255,0,0);
strokeWeight(2);
noFill();
rect(50, 100, 150, 50, 10);
}

11. • Processing IDE Source Code - Continued
// If the button "Turn OFF" is pressed
if(mousePressed && mouseX>250 && mouseX<400 && mouseY>100 && mouseY<150){
myPort.write('0'); // Sends the character '0' and that will turn on the LED
stroke(255,0,0);
strokeWeight(2);
noFill();
rect(250, 100, 150, 50, 10);
}
}

12. • Final Output