Modify The HC-05 Bluetooth Module Defaults

Modify The HC-05 Bluetooth Module Defaults

// thanks to http://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/
// wiring diagram: https://cdn.instructables.com/FM8/W4A2/HKZAVRT9/FM8W4A2HKZAVRT9.LARGE.jpg
/*
AUTHOR: Hazim Bitar (techbitar)
DATE: Aug 29, 2013
LICENSE: Public domain (use at your own risk)
CONTACT: techbitar at gmail dot com (techbitar.com)

 Procedure to ensure AT Command Mode (identified by slow-blinking LED on HC-05) has been entered: 
  0. Unplug power from HC-05
  1. Upload sketch from above Instructable
  2. Hold in HC-05 button (above EN/Key pin) 
  3. Reconnect power to HC-05
  4. Wait until LED blinks slowly
  5. Release HC-05 button
  6. Press Arduino reset button
  7. Open Serial Monitor - baud rate = 9600
  8. Make sure "Both NL & CR" is selected
  9. Type AT commands - examples: 
     •	AT    (should get response "OK")
     •	get current firmware version:  AT+VERSION?
     •	get current name : AT+NAME?
     •	change name to "Joe" : AT+NAME=Joe
     •	get device name : AT+RNAME?
     •	change default security code from 1234 to 2987 : AT+PSWD=2987
     •	get module's address :  AT+ADDR?
     •	restore factory defaults : AT+ORGL

 To return to Bluetooth communications mode, disconnect power from HC-05, then reconnect.

 To reduce power consumption, explore the SNIFF and IPSCAN commands
     http://www.edaboard.com/thread267303.html

*/

#include <SoftwareSerial.h>

SoftwareSerial BTSerial(10, 11); // RX | TX

void setup()
{
  pinMode(9, OUTPUT);  //  pull HC-05 pin 34 (key pin) HIGH to switch module to AT mode
  digitalWrite(9, HIGH);
  Serial.begin(9600);
  Serial.println("Enter AT commands:");
  BTSerial.begin(38400);  // HC-05 default speed in AT command more
}

void loop()
{
  // Keep reading from HC-05 and send to Arduino Serial Monitor
  if (BTSerial.available())
    Serial.write(BTSerial.read());

  // Keep reading from Arduino Serial Monitor and send to HC-05
  if (Serial.available())
    BTSerial.write(Serial.read());
}