mCookie-WiFi

mCookie-WiFi is WIFI communication module, which can connect other WIFI devices and communicate with mCookie CoreUSB via serial port.

mCookie Core cannot reach 115200 baud rate for serial communication and therefore won't work with the WiFi module.

mCookie Core+ is supported, but see Core+ issue with WiFi module.

Features

• Serial communication.
• Accessible for the internet.
• Small, stackable and economic.

Specification

• Way of communication: Serial port transmission with the default serial port D0(RX) and D1(TX).
• Power supply: +3.3VDC 50mA.
• Status indicator.

Common AT Instruction

• All AT instructions are ended with "\r\n ".

• Common AT instruction:
  • AT+RST Restart modules
  • AT+GMR Check version info.
  • AT+CWMODE=3 Station & access point
    • 1 Station mode
    • 2 AP mode
    • 3 AP & Station

• • AT+CWLAP WIFI SSID list

• • AT+CWSMARTSTART=0 Start smart connection
    • 0: Use AL-LINK
    • 1: Use ESP-TOUCH
    • 2: Use AIR-KISS

• • AT+CWSMARTSTOP Stop smart connection

• • AT+CWJAP="<access_point_name>","<password>" Add to a certain WIFI

• • AT+CIFSR Display WIFI information

• • AT+CIPSTATUS Acquire connection status

• • AT+CIPSTART=4,"TCP","baidu.com",80 Establish TCP/UDP connection

• • AT+CIPCLOSE Shut off TCP/UDP connection (Single connection)

• • AT+CIPCLOSE=5 Close multi-connection

• • AT+CIPMUX=1 Start multi-connection

Document

Support AT instruction configuration/contro: File:ESP8266 WiFi Module Quick Start Guide v 1.0.4.pdf

Development

Program

File:ESP8266TestV1.zip

Change your WIFI password in the code where there are SSID(WIFI name) and password setting.

Download Program

• • Stacke mCookie-WiFi and mCookie-CoreUSB, plug USB cable into mCookie-CoreUSB on one side and connect computer USB socket on the other side. Then, start Arduino IDE, copy the program above to IDE, select Microduino-CoreUSB in (tools) -> (Board) and choose the right serial number in (tools) -> (Serial). After that, please click button (√) on the top left of IDE and compile the program. Burn the program to the board after compiling by clicking button (->);
• Open serial monitor and set "\r\n " and "115200 baud "
• The notice of successful WIFI connection will pop up at first.
• Enter AT instruction in the serial port and it will return "OK".
• Enter website such as baidu.com in the serial port and it will return webpage data.

Serial

• Enter fixed instructions in the serial monitor and you'll see returned result, which can refer to common AT Instruction part.

Such as:

• AT+GMR
• AT+CIFSR
• AT+CIPSTATUS

AT

IDE Tests Program

Change your WIFI password in the code where there are SSID(WIFI name) and password setting.

Download Program

• Stack Microduino-WiFi(ESP) with Microduino-Core+ and Microduino-USBttl, plug USB cable into mCookie-CoreUSB on one side and connect computer USB socket on the other side. Then, start Arduino IDE, copy the program above to IDE, select Microduino-CoreUSB in (tools) -> (Board) and choose the right serial number in (tools) -> (Serial). After that, please click button (√) on the top left of IDE and compile the program. Burn the program to the board after compiliing by clicking button (->)
• Open serial monitor and set "\r\n " and "115200 baud "
• Firstly, you'll see notice of successful WIFI connection.
• If you see content description, it means you have visited "www.baidu.com".
  

  Serial

Pin Description

Note: Images of the WiFi module are of an old revision.

mCookie-WiFi

mCookie-WiFi

Project

Related Projects: WiFi Weatherstation

FAQ

Core+ Issue

I can't get the Core+ and WiFi module to work with the example codes!

mCookie modules and Microduino modules uses 27 pins. The pins are layed out in a "U" shape. In the mCookie Series, they are the 27 springy pins on the stackable modules. The pins each have various functions such as some provide power such as ground and power, or provide analog and / or digital input and output. Furthermore, some pins are used for serial communication. Serial communication is a type of communication used to communicate between different devices such as in mCookie between the core modules and communication modules (WiFi, Bluetooth, etc). There may be an issue with some early mCookie WiFi modules being shipped to communicate over pins 0 & 1 in 302 Expert Kits.

• Pin 0 & 1 are used to program a Core+ module.
• Pin 0 & 1 are used to debug (over serial port) a Core+ module.
• Pin 0 & 1 may be used by the WiFi module to communicate with the Core+ module. If the WiFi module is hardwired to use Pin 0 & 1.

This create a conflict of overlapping pins usage. The WiFi module will interfere with programming and debugging a Core+ module since both use the same Pin 0 & 1 for communication.

• Un-stacking the WiFi module will make the Core+ programmable.
• Debugging a Core+ module with WiFi using Pin 0 & 1 is not possible since there will be interference.

Although it is possible to use the Core+ and WiFi module in this configuration. It isn't particular easy to debug (since there is no serial monitor) and the constant un-stacking and re-stacking of the WiFi module to enable programming a Core+ module. The solution to fix the overlapping and interference issue will be to rewire the WiFi module to use Pins 2 & 3 to communicate with a Core+ module. This will eliminate the programming and debugging issue.

Note:

• Pin 0 & 1 is referred to Serial in Core+
• Pin 2 & 3 is referred to Serial1 in Core+

This can be accomplished following the image below. It requires the use of a razor blade to cut two traces and connecting two pads with a soldering iron. Please proceed with caution with attempting this modification. As, done incorrectly can permanently damage the WiFi module. After the modification, the WiFi module will communicate with a Core+ module over Pins 2 & 3. And a Core+ module will continue to use Pins 0 & 1 for programming and debugging. Thus, removing the pin overlap interference issue.

Images

Note: Images of the WiFi module are of an old revision.

mCookie-BT Front

mCookie-BT Back