Data Firmware

AT Command mode of HC 05

HC-05 Bluetooth Module support both Master and Slave roles. We can set it in AT Command mode. There are a number of variant of HC-05, and different ways to enter AT Command mode. For my samples, there is a button on the lower-right, above EN pin. Its used to enter AT Command mode when power-on.



This video show how to connect PC to HC-05, via FTDI USB-to-Serial adapter, power-on HC-05 in AT Command mode, and enter AT Command using Arduino Serial Monitor to check setting of HC-05.


Please notice both FTDI USB-to-Serial adapter and HC-05 have to work on the same voltage, both 3.3V or both 5V.

- Connect FTDI and HC-05
FTDI Tx - HC-05 Rx
FTDI Rx - HC-05 Tx
FTDI GND - HC-05 GND
(no power apply to HC-05 now)

- Connect FTDI to PC using USB cable.
- You can check the COM port connect to FTDI in Deviec Manager.
- Start Arduino IDE, and run Tools > Serial Monitor.
- Set baud rate 38400 and select "both NL & CR".

- Press the on-board button of HC-05.
- Apply power to HC-05.
- The on-board LED of HC-05 will blink slowly.
- Now its in AT Command mode.

- You can type AT command in Arduino Serial Monitor to check or set the setting of HC-05.

Some useful command:
AT : return OK if connect correctly.
AT+NAME : get/set name of the device. Nothing return in my sample.
AT+ADDR : display default address
AT+VERSION : display firmware version
AT+UART : get/set serial communication setting; such as baud, number of stop bit, and parity.
AT+ROLE: get/see role of bt module(1=master/0=slave)
AT+RESET : Reset and exit AT mode
AT+ORGL : Restore factory settings
AT+PSWD: get/set default PIN

reference:
- iteadstudio: Serial Port Bluetooth Module (Master/Slave) : HC-05
- HC-03/05 Embedded Bluetooth Serial Communication Module
AT command set

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First look at the WeMos D1 Arduino compatible ESP8266 Wifi Board from Banggood com

This video take a look at the WeMos D1: a Wi-Fi enabled Arduino compatible board based on the ESP8266 chip. The price of it is so tempting, less than 9$.


The board looks like an ordinary Arduino board. The dimensions and the pin layouts are exactly the same. So, this board is compatible with all the existing shields for Arduino. But don’t expect them to work at once, since the libraries available for the ESP8266 chip are few so far. The board, instead of an ATMEGA chip that standard Arduino boards use, use the impressive ESP8266 WiFi chip!

The ESP8266EX chip that the WeMos D1 board uses offers:
• A 32 bit RISC CPU running at 80MHz
• 64Kb of instruction RAM and 96Kb of data RAM
• 4MB flash memory! Yes that’s correct, 4MB!
• Wi-Fi
• 16 GPIO pins
• I2C,SPI
• I2S
• 1 ADC

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CODE OF THE PROJECT
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http://educ8s.tv/arduino-esp8266-tutorial-first-look-at-the-wemos-d1-arduino-compatible-esp8266-wifi-board/

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