2014년 9월 24일 수요일

DHL will do delivery-by-drone, but only for one tiny European island

DHL will do delivery-by-drone, but only for one tiny European island.

I think that it has some Social Responsibility but technology is developing constantly.

2014년 9월 23일 화요일

Arduino Client for MQTT « knolleary

Arduino Client for MQTT « knolleary.

MQTT is one protocol for Machine-to-machine (M2M) / Internet of Things.
Many Cloud Service company support MQTT as follows server
Mosquitto (mosuitto.org -> Eclipse)
RSMB (IBM developerWorks)
ActiveMQ (Apache)
Apollo (Apache)
Mosca (node.js)
RabbiMQ (vmWare)
mqtt.jx (github)

DIY - WiFi Shield for GR-KURUMI

I tried to make the WiFi Shield for GR-KURUMI.
For GR-KURUMI WiFi shield, WizFi250 is select as WiFi module which provides UART-to-WiFi and SPI-to-WiFi.
To test simply, FI250 library which is selected UART interface for Host Interface is used as WiFi Library.
Ref. : Comparison of WizFi250 (WiFi Module) Shield / Library in WIZnet and Seeeduino

GR-KURUMI and WizFi250 could be connect to "Serial1": serial1 is UART interfae which is consist TXD(7) and RXD.(8) as below GR-KURUMI Pin map.

[caption id="" align="alignnone" width="910"]

GR-KURUMI Pin Map[/caption]

1. Hardware

Hardware conntections

GR-KURUMI	WizFi250
7	TXD:JP2
8	RXD:JP2
GND	GND
VCC	TP2

Follow these steps to connect the actual, is as shown in the following figure.

[caption id="" align="alignnone" width="233"] WiFi Shield for GR-KURUMI

1. prepare GR-KURUMI, WizFi250, WizFi250-EVB, FTDI board, Bread board, Ext. Anttena[/caption]

[caption id="" align="alignnone" width="233"] Wiz250 (WiFi Shield) top for GR-KURUMI

2. connect TP2 to 3.3V in JP5 for 3.3 power input of GR-KURUMI[/caption]

[caption id="" align="alignnone" width="229"]

3. Wiz250 (WiFi Shield) bottom for GR-KURUMI: Connect TXD@JP2 to AD1@JP7 and Connect RXD@JP2 to AD0@JP7[/caption]

[caption id="" align="alignnone" width="230"]

4.1 Interface board (WiFi Shield) top for GR-KURUMI[/caption]

[caption id="" align="alignnone" width="223"]

4.2 Interface board (WiFi Shield) bottom for GR-KURUMI : Red : 3.3V / White : GND / Green : RXD / Yellow : TXD / Blue: WizFi250 RESET[/caption]

[caption id="" align="alignnone" width="224"] GR-KURUMI with Wiz250 (WiFi Shield, Ext. Ant.)

GR-KURUMI with Wiz250 (WiFi Shield, Ext. Ant.)

5. Stack up with Wiz250 (WiFi Shield), Interface board and GR-KURUMI[/caption]

2. Software

* Library

I forked Fi250 Library at Fi250 Webpage.
Lib. is modified for GR-KURUMI and added some function.
Lib. is upload at Github : https://github.com/embeddist/Seeeduino_WizFi250

* IDE : IDE for GR 0.4.0

3. programming and debugging interface

* programming interface

[caption id="" align="alignnone" width="339"]

GR-KURUMI Programming[/caption]

* debugging interface : USB Interface (power & USART1)

[caption id="" align="alignnone" width="345"]

WizFi250-EVB[/caption]

4. Set Sketch: wizfi250_test.ino

__Before setting wizfi250 example, you should be import the WizFi250 Lib. at IDE for GR. __

#define SSID "STEST" //Input SSID
#define KEY "87654321" // Input Password
#define AUTH "WPA2" // Input Encrytion Type

#define wizfi250_rst 9 // Chech and Set wizfi250 hw reset pin

Demo: Debugging Messages

AT
[OK]
AT+WSET=0,3PA-W //SSID of AP
[OK]
AT+WSEC=0,WPA2,wiznet--- // password
[OK]
AT+WNET=1
[OK]
AT+WJOIN
Already Associated : Station Mode
[OK]
AT+WSTAT
IF/SSID/IP-Addr/Gateway/MAC/TxPower(dBm)/RSSI(-dBm)
STA/3PA-W/192.168.123.136/192.168.123.254/00:08:DC:1C:D8:73/31/33 //DHCP IP address and Info... from AP
[OK]

2014년 9월 22일 월요일

Comparison of WizFi250 (WiFi Module) Shield / Library in WIZnet and Seeeduino

WizFi250 Shield is one of Arduino WiFi shield. WizFi250 Shield is consist of WizFi250(WiFi Module) and interface board which has Arduino connector. There are 2 kind of WiFi shield by using WizFi250. (WizFi250-EVB and Fi250)

WizFi250

WizFi250 is an WiFi module for embedded system and provides UART and SPI interfaces which enable connections to any embedded design utilizing an 8/16/32-bit microcontroller via simple AT commands.

-Features

Single band 2.4GHz IEEE 802.11b/g/n
Supports wireless data rates up to 65Mbit/s
Device Package : 28×20 mm (17×20 mm)
Serial Interface : UART, SPI
Powerful Web server provides
Soft AP
OTA(Over The Air F/W Upgrading)

Interface board for WiFi Shield

Fi250 : contain a Micro SD card socket and key for AP mode.

WizFi250-EVB : Function button provides alternative modes, as like Factory Recovery, AP mode, OTA mode and Factory Default

Library for WiFi Shield

There also are 2 kind of WiFi shield library for WizFi250.
- Fi250: https://github.com/embeddist/Seeeduino_WizFi250 (current 05:58, 16 February 2014)
- WizFi250-EVB : https://github.com/embeddist/Arduino_WizFi250

*Comparison of WiFi Library by using WizFi250

	<Fi250	WizFi250-EVB
BSD Socket API	TCP -	TCP UDP
Serial Interface	UART -	- SPI
Support Multi-Socket	-	O
Lib. Zip file Size	7KB	928KB
Example	WizFi250_http WizFi250_Client WizFi250_Server WizFi250_test	WizFi250RCCar WizFi250UdpNtpClient WizFi250WebClientTest WizFi250WebServer WizFi250XivleyClient

Fi250 library is simple. I think that Fi250 library is powerful for beginner. WizFi250-EVB library is possible to various tests of Serial-to-WiFi by using Multi-socket and BSD socket APIs.