Arduino HC05 - AT commands won't respond

Question

A little while ago i tried using AT commands on my HC05 bluetooth module using my arduino mega 2560 and it worked fine , skipping a few weeks ahead i tried doing the same , only now i suddenly doesn't work , i tried replacing the arduino and HC05 module , even used the same script for the commands. So i unplugged the module's VCC , pressed the button on the module , reconnected the VCC and the module was blinking every 2 seconds (it's in AT mode !) , now i go ahead to the serial monitor and using that script i typed the command i wanted to execute and it just didn't do nothing , i saw the serial LED on the arduino blink , but nothing was written in the serial monitor and nothing was changed in the arduino.

Does anyone know how to solve this ? it worked perfect before , but now it wont D:

Answer 1

Maybe you should try a couple of different baud rates for your script? Also check that your RX/TX wires are connected in the right order. I've had some HC-05 modules where RX/TX markings on the module were reversed.

Answer 2

Here's the solution! First, you have to wire the board like the solution 2 in the instruction. http://www.elecfreaks.com/wiki/index.php?title=Bluetooth_Shield Then, Use this code!

/*********************************************************************
 ** Description: **
 ** This file is a sample code for your reference. **
 ** **
 ** Copyright (C) 2011 ElecFreaks Corp. **
 ** Created by ElecFreaks Robi.W /29 Sep 2011 **
 ** **
 ** http://www.elecfreaks.com **
 *********************************************************************/
void setup()
{
 Serial.begin(57600);
 Serial1.begin(38400);
}
void loop()
{
 int i = 0;
 char someChar[32] = {0};
 // when characters arrive over the serial port...
 if(Serial.available()) {
 Serial.print("-------> ");
 do{
 someChar[i++] = Serial.read();
 //As data trickles in from your serial port you are grabbing as much as you can, 
 //but then when it runs out (as it will after a few bytes because the processor 
 //is much faster than a 9600 baud device) you exit loop, which then
 // restarts, 
 //and resets i to zero, and someChar to an empty array.So please be sure to keep this delay 
 delay(3);
 }while (Serial.available() > 0);
 Serial1.println(someChar);
 Serial.println(someChar);
 }
 while(Serial1.available())
 Serial.print((char)Serial1.read()); 
}