Controlling HC-05 from a sketch

Question

Hi I am making a sketch and circuit with a HC-05 BT receiver to upload sketches via Bluetooth to my Uno. This requires giving AT commands from the sketch. I would like to see the response from the HC-05 but so far I haven't got it to work. I want to view the response via the standard serial connection and serial monitor. The commands from the sketch are not being recognized by the HC-05 and I would like to see the HC-05 response to troubleshoot it.

If you have a minute would you mind giving me a tip? I would greatly appreciate it. See the ArdProgramModeOn() and Off functions at the end.

Thanks

int ATModePin = 2;  // pin for HC-05 AT comand mode
int HC05powerPin = 3;  // pin for powering HC-05 when high
char btserialrx;  // data through from bt connection
char myChar; // data through serial port connection
#define rxPin 8 // HC-05 bt serial pin
#define txPin 9 // HC-05 bt serial pin

#include <SoftwareSerial.h>
SoftwareSerial btSerial(rxPin, txPin); // RX, TX

void setup() {
  pinMode(ATModePin, OUTPUT);
  pinMode(HC05powerPin, OUTPUT);
  pinMode(5, OUTPUT);
  Serial.begin(9600);   
  btSerial.begin(115200); 
  
  digitalWrite(HC05powerPin, HIGH);
  delay(2000);
  }

void loop() {

  while (btSerial.available()) {
    btserialrx = btSerial.read();
  }

  if(btserialrx == '1'){  // change to upload / reset mode
    Serial.println("switching to upload mode");
    ATModeOn();
    ArdProgramModeOn();
    ATModeOff();
    btserialrx = '0';
  }
  else if (btserialrx == '2'){  // change to normal mode
    Serial.println("switching to normal mode");
    ATModeOn();
    ArdProgramModeOn();
    ATModeOff();
    btserialrx = '0';
  }
}


void ATModeOn(){  // reset HC-05 and change HC-05 to AT Command Mode
  digitalWrite(5, HIGH);
  digitalWrite(ATModePin, HIGH); // AT command mode on upon reset
  delay(2000);
  digitalWrite(HC05powerPin, LOW); // hc-05 off
  delay(2000);
  digitalWrite(HC05powerPin, HIGH); // hc-05 on
  delay(2000);
} 

void ATModeOff(){  // reset HC-05 and return HC-05 to std. operation 
  digitalWrite(5, LOW);
  digitalWrite(ATModePin, LOW); // AT command mode off upon reset
  delay(2000);
  digitalWrite(HC05powerPin, LOW); // hc-05 off
  delay(2000);
  digitalWrite(HC05powerPin, HIGH); // hc-05 on
  delay(2000);
}

void ArdProgramModeOn(){
  btSerial.println("AT");
  delay(1000);
  btSerial.println("AT+POLAR=1,0");  // Arduino reset mode upon HC-05 connection for programming
  delay(1000);
  btSerial.println("AT+POLAR?");  // Arduino reset mode upon HC-05 connection for programming
  delay(2000);
  while (btSerial.available()) {  // Show responses from HC-05
    myChar = btSerial.read();
    Serial.print(myChar);
  }
  delay(4000);
}

void ArdProgramModeOff(){
  btSerial.println("AT");
  delay(1000);
  btSerial.println("AT+POLAR=1,1");  // Arduino normal mode no reset upon HC-05 conection
  delay(1000);
  btSerial.println("AT+POLAR?");  // Arduino reset mode upon HC-05 connection for programming
  delay(2000);
  while (btSerial.available()) {  // Show responses from HC-05
    myChar = btSerial.read();
    Serial.print(myChar);
  }
  delay(4000);
}

Answer 1

Unless you've manually set the btSerial speed, you need to be at the default for AT commands which is 38400 -> btSerial.begin(38400);

If you want to read regular Serial communication, you'll need to monitor 9600 -> btSerial.begin(9600);

If you are unable to to send commands, I feel as if you wouldn't have changed the default speeds.

I used this link as a reference with my project: Modify The HC-05 Bluetooth Module Defaults Using AT Commands

Lastly, you didn't mention whether or not you soldered a jumper wire to PIN 32 for your ArdProgramOff/On. Another reference for you as well: DIY Arduino Bluetooth Programming Shield

Hope my answer helps! Good luck!