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Problem with flashed HC-05 and arduino uno
GiovanniPio Posted: 31 May 2018, 02:10 PM
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Posts: 2
Joined: 31-May 18
 Hey, people, I really need some help: I flashed my HC-05 module with RN-42 firmware, then i tried to hook it up as shown in the video linked below, but instead of using an arduino nano I'm using the uno. The problem is that RN-42 commands don't work in the serial monitor... In the hookup everything seems to work fine, the led blinks once per second, the code uploads succesfully, but then i write $$$ and press enter (or click send) and nothing happens.

Link to the video: https://www.youtube.com/watch?v=UJaqHnPR-XE&t=157s

Here's the code:

#include <SoftwareSerial.h>



SoftwareSerial bluetoothSerial(2,3);



void setup()

{

  Serial.begin(9600);

  
 bluetoothSerial.begin(9600);
}



void loop()

{

  if (bluetoothSerial.available())

  {

    Serial.print((char)bluetoothSerial.read());

  }

  if (Serial.available())

  {

    bluetoothSerial.print((char)Serial.read());

  }

}


(User posted image)


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GiovanniPio Posted: 31 May 2018, 02:22 PM
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Posts: 2
Joined: 31-May 18
 I did some tests, turns out that the code blocks in this part of the loop function: 


{

  if (bluetoothSerial.available())

  {

    Serial.println((char)bluetoothSerial.read());

  }


in order to show where there was a problem I wrote an else to this piece of code, like this:


if (bluetoothSerial.available())

  {

    Serial.println((char)bluetoothSerial.read());

  }
  else{
    Serial.print("not_available_bt");
    }



So, now that I know this, how do i solve it? Can you help me to find the problem?


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DAVID Posted: 31 May 2018, 09:20 PM
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 or you can pop out the atmega328p from the socket and connect the rx pin of the hc05 to the tx of the arduino

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DAVID Posted: 31 May 2018, 09:21 PM
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 or use the ftdi cable

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DAVID Posted: 31 May 2018, 09:30 PM
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I love mcus

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Posts: 237
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 and i test your code and it work fine for me
with the software serial port running at 115200 baud
but without the hc05 pullup on pio 7

Last edit by DAVID at 31 May 2018, 09:31 PM

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DAVID Posted: 16 Jul 2018, 02:46 PM
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Joined: 10-September 17
 did you check that the hc05 has power at the 3.3v regulator??

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