HC05 not responding

Other Hardware 3rd Party Boards
1

I have an HC05 previously set to baud 38400 and I wanted to revert so I used AT+UART=9600,0,0
but now the board isn't responding to any available baud rates in the IDE.
I'm using a NANO as serial convertor

2

How is the HC05 wired to the Nano? Please post a diagram and/or photos that clearly show the wiring.

What, exact, HC05 module do you have?

Can you put the HC05 into AT mode and communicate with it (at 38400 baud)?

3

It responded don't know how I just kept trying to do everything at once

4

1. Connect UNO/NANO and HC5 as per Fig-1.
HC5-uno
Figure-1:

2. Upload the following sketch:

#include<SoftwareSerial.h>
SoftwareSerial SUART(2, 3);  //SRX at UNO = 2, STX = 2

void setup()
{
  Serial.begin(9600);
  SUART.begin(38400);  //AT Command Bd; data bd = 9600
}

void loop()
{
  if (SUART.available())
  {
    char x = SUART.read();
    Serial.print(x);
  }

  if (Serial.available())
  {
    char c = Serial.read();
    SUART.print(c);
  }
}

3. Do not pair the BT with any device.
4. Bring BT into AT Command.
(1) Disconnect 5V from BT.
(2) Connect EN-pin of BT with 3.3V of UNO/NANO.
(3) Press and hold the microswitch
(4) Connect 5V supply
(5) After 3/4 seconds, release the micro switch.
(6) The BT must have entered into AT Command Mode. The indication is that the red LED blinks once in two seconds.

5. Send AT+UART command to BT. BT should respond with the current Bd. Set it to 9600,0,0 if not at this Bd.

6. Remove 3.3V from EN-pin of BT. Disconnect 5V and connect back.

7. Change SUART.begin(38400) to SUART.begin(9600) in the sketch of Section-2 and upload it.

8. Pair it with your Android Phone.
9. You should be able to communicate between Arduino and Phone via HC5.

5

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