Failed to get response for AT mode on HC-05

[rengman]

Hi there,
Am working on a project to pick sound with a microphone sensor and and then send it over the hc-05 bluetooth module to my phone. am still in the begining stages but i have surely failed to configure my module. I can switch the module to AT mode and the light will blink as it has to for both "AT" and "pair" but when i go to the serial monitor i receive nothing as the response.
am open to any help but am on deadline please help.
thanks in advance

[sterretje]

Please do not post in "Uncategorized"; see the sticky topics in Uncategorized - Arduino Forum.

Topic has been moved.

Which Arduino are you using?
Have you tried swapping the Rx and the Tx?

[rengman]

Sorry am new here, am using arduino UNO R3

[rengman]

After reading alot, I have found a temporary solution. I wll get time to verify if it actually works permanently i used this code ...

#include <SoftwareSerial.h>
SoftwareSerial BTserial(2, 3); // RX | TX
// Connect the HC-05 TX to Arduino pin 2 RX.
// Connect the HC-05 RX to Arduino pin 3 TX through a voltage divider.

char c = ' ';
byte ATmodePin = 5;

void setup()
{
   // set up the pin used to turn on AT mode
   pinMode(ATmodePin, OUTPUT);
   digitalWrite(ATmodePin, LOW);

   // Start the serial monitor
   Serial.begin(9600);
   Serial.println("Arduino is ready");

   // HC-05 default serial speed for communication mode is 9600
   BTserial.begin(9600);
   Serial.println("BTserial started at 9600");
   Serial.println("Type # to enter AT mode");
}

void loop()
{

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

   // Keep reading from Arduino Serial Monitor and send to HC-05
   if (Serial.available())
   {
      c = Serial.read();

      if (c == '#') // enter AT mode
      {
         digitalWrite(ATmodePin, HIGH);
         Serial.print("Entered AT mode. Type $ to exit");
      }

      else if (c == '$') // exit AT mode by reseting the HC-05
      {
         digitalWrite(ATmodePin, LOW);
         BTserial.print("AT+RESET\n\r");
         Serial.print("AT+RESET\n\r");
      }
      else
      {
         Serial.write(c);
         BTserial.write(c);
      }
   }
}

and now when i open serial monitor, and hold the reset button on the module I get responses.

[Nick_Pyner]

@rengman

BTserial.begin(9600);

@rengman

I get responses.

Probably not true. The baud rate for communication in AT mode is 38400. Further, your code is clunky, overly-complicated, and misleading. Check the Martyn Currey website for proper procedures and sensible code.