Bluetooth Module

Diagram

Serial communication

#include <SoftwareSerial.h>

SoftwareSerial hc06(2,3);

void setup(){
  //Initialize Serial Monitor
  Serial.begin(9600);
  Serial.println("ENTER AT Commands:");
  //Initialize Bluetooth Serial Port
  hc06.begin(9600);
}

void loop(){
  //Write data from HC06 to Serial Monitor
  if (hc06.available()){
    Serial.write(hc06.read());
  }
  
  //Write from Serial Monitor to HC06
  if (Serial.available()){
    hc06.write(Serial.read());
  }  
}

Sending commands

1. Open Tools → Serial Monitor (No line ending, 9600 baud)

2. Commands to interact:

   Simple Check: AT

   Returns OK

   Set name: AT+NAMEsanbt

   Returns OKsetname

   Set password: AT+PIN0000

   Returns OKsetPIN

   Set baud rate: AT+BAUD4

   Returns OK9600

   (Note: 1 for 1200, 2 for 2400, 3 for 4800, 4 for 9600, 5 for 19200, 6 for 38400, 7 for 57600, 8 for 115200)

Bluetooth test with Android App

Step 1. Run Arduino script

#include <SoftwareSerial.h>
SoftwareSerial hc06(2, 3);
char a;
//byte receivedData;

void setup() {
  //Initialize Serial Monitor
  Serial.begin(9600);
  Serial.println("Listening to Bluetooth port:");
  //Initialize Bluetooth Serial Port
  hc06.begin(9600); // TAMTAM 0000
}

void loop() {
  //Write data from HC06 to Serial Monitor
  if (hc06.available()) {
    // if text arrived in from BT serial...
    a = (hc06.read());
    if (a == '1')
    {
      hc06.println("LED on");
    }
    if (a == '2')
    {
      hc06.println("LED off");
    }
  }
}

Step 2. Download app on Android

Get one of the following apps: