Reset and Factory Setting Default HC05 and HC 06 Bluetooth

https://www.thaieasyelec.com/downloads/EFDV390/EFDV390_Datasheet.pdf

http://roboconshop.com/getattachment/1ce1c8ab-ee3f-4c79-82ce-8a97a5ddf536/FileName.aspx

 

 

https://www.instructables.com/id/Changing-Baud-Rate-of-HC-05-Bluetooth/

https://www.instructables.com/id/HOW-TO-HC-05-Bluetooth-MODULE-AT-Commands-With-But/

https://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/

(remove double quotes from AT command)

    To return HC-05 to mfg. default settings: "AT+ORGL"
    To get version of your HC-05 enter: "AT+VERSION?"
    To change device name from the default HC-05 to let's say MYBLUE enter: "AT+NAME=MYBLUE"
    To change default security code from 1234 to 2987 enter: "AT+PSWD=2987"
    To change HC-05 baud rate from default 9600 to 115200, 1 stop bit, 0 parity enter: "AT+UART=115200,1,0"

https://www.instructables.com/id/AT-command-mode-of-HC-05-Bluetooth-module/

Most useful AT commands are

AT : Ceck the connection.
AT+NAME : See default name
AT+ADDR : see default address
AT+VERSION : See version
AT+UART : See baudrate
AT+ROLE: See role of bt module(1=master/0=slave)
AT+RESET : Reset and exit AT mode
AT+ORGL : Restore factory settings
AT+PSWD: see default password

Reset and Factory Setting Default

ESP8266/ARDUINO Bluetooth Led Control

 https://www.youtube.com/watch?v=rN4KjbXxs6A

ESP8266 Melody

 https://elearn.ellak.gr/mod/book/tool/print/index.php?id=2815&chapterid=1163

https://www.geekering.com/?p=633

 https://diyi0t.com/sound-tutorial-for-arduino-and-esp8266/

Sound Tutorial for Arduino, ESP8266 and ESP32  Buzzer

ESP8266 Basic OTA

 https://www.youtube.com/watch?v=GR2ZXyPaqMo

Library

https://github.com/jandrassy/ArduinoOTA

QR Code OLED

https://techtutorialsx.com/2017/12/16/esp32-arduino-ssd1306-oled-drawing-a-qr-code/

#include <Wire.h>

#include "SSD1306.h"

#include <qrcode.h>

 

SSD1306 display(0x3c, 5, 4);

QRcode qrcode (&display);

 

void setup() {

 

  display.init();

  display.display();

 

  qrcode.init();

  qrcode.create("Hello from esp32");

}

 

void loop() {}

ESP32 Built-in OLED Board (Wemos Lolin32): Pinout, Libraries and OLED Control

https://randomnerdtutorials.com/esp32-built-in-oled-ssd1306/
SSD1306Wire  display(0x3c, 5, 4);
https://www.youtube.com/watch?v=wRW32gTLsKE
https://techtutorialsx.com/2017/12/02/esp32-arduino-interacting-with-a-ssd1306-oled-display/