Edge Of The Web
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This document is a practical guide on connecting hardware, specifically focusing on the Arduino platform, which is characterized by its open-source design and ease of programming. It covers various connection methods for Arduinos, including Ethernet, wireless options like XBee modems, and cloud services like Pachube for real-time sensor data. Additionally, the document highlights challenges in debugging, communication protocols, and provides useful resources for further exploration.
Edge Of The Web
- 1. A Practical Guide to Connecting Hardware to the Web Justin Mclean www.classsoftware.com
- 2. Who am I? • Director of Class Software for 15 years • Developing and creating web applications for 15 years • Programming for 25 years • Adobe solution partner • Adobe certified developer and trainer in Flex and ColdFusion • Based in Sydney Australia
- 3. Electronics Trends • Low cost • Small components • Complex components with simple interfaces
- 4. Computing Trends • Easier to program • Use of high level languages • Software tools • Open source
- 5. Are We There Yet? • Low cost fast devices • It’s easy to communicate between devices and computers • Can build complex systems from off the shelf components
- 6. Arduino Overview of the Arduino Platform
- 7. Arduino Platform • Open source hardware and software platform • Easy to program • Hardware is flexible, fast, low power and low cost
- 8. Arduino Hardware • Comes in a number of shapes sizes • Low cost • Easy to extend
- 10. Arduino Shields
- 11. Arduino Software Platform • Open source cross platform IDE • Alpha but very stable • Code in high level C like language • Updated frequently • Growing and active community
- 12. Arduino Code • C like high level language • Inbuilt functions to read and set digital and analog inputs and outputs • Includes libraries to perform common hardware or software tasks
- 13. Arduino IDE
- 14. Led Shield Demo
- 15. Issues • Debugging can be hard • No simulator • Memory, power and speed limits • Helps to have a little electronic knowledge
- 16. Connecting Arduinos How Arduinos communicate with the outside world
- 17. Connection Methods • Direct to computer • Wireless (XBee modems) • Ethernet or WiFi • The Cloud
- 18. Supported Languages • Flex and Flash • Processing • Python • Ruby • Java • C, C++, C# and Objective C • .NET
- 19. Direct Connection How to communicate with Arduinos and via PCs
- 20. Direct Communication • Most languages can’t talk USB • Solution: Socket to USB proxy
- 21. Layers of Communication • Library to communicate with proxy • Proxy to USB communication • USB to arduino
- 22. Computer Arduino Application Code Arduino Function Calls and Code Events TCP/IP USB Library USB Proxy Firmata Socket Cable Connection Diagram
- 23. Firmata Protocal • Simple binary protocol • Based on MIDI • Easy to extend • Standard Arduino software library
- 24. Arduino Demo
- 25. Issues • Works best with a persistent connection • If not persistent startup time and auto reset issues • Solution: custom bootloader • Needs a computer • Proxy must be running on machine Arduino is connected to
- 26. Xbee Modems Using Arduinos with XBee modems
- 27. XBee Modems • Hardware wireless modem • Low cost • Consume very little power • Good range • Easy to configure
- 28. XBee Modems
- 29. XBee Demo
- 30. Ethernet Using Arduino Ethernet Shields
- 31. Ethernet Shields • Allow direct internet connection • No dedicated computer needed • Shields need a little config • Can act as web server or client
- 32. Ethernet Shields
- 33. Ethernet Arduino Code • Web server code • Easy to modify
- 34. Ethernet Demo
- 35. Pachube An easier way to connect Arduinos
- 36. Pachube • Store and share and acess realtime sensor data • Simple and secure • API to interact with all data and services • Graphs and maps
- 37. Pachube
- 38. Pachube API • Communicates HTTP • Plain text (csv), XML or Jason • REST based • Large base of supported languages
- 39. Pachube Arduino Code • Runs on Arduino with ethernet shield • Sends values to Pachube • Request values via Pachube
- 40. Pachube Interaction • Call Pachube API using HTTP call • Parse XML • XML is in EEML format • Display or act on values
- 41. Pachube Demo
- 42. Pachube Triggers • Pachube can call an URL on value change • The URL can be a dynamic
- 43. Why do this? • Expose yourself to new ideas and new ways of solving problems • Involves interaction with the real world • Encourages creativity • Makes you a better programmer
- 44. It’s Fun!
- 45. Questions? • Ask now, see me after session or email justin@classsoftware.com
- 46. Useful Sites List of useful hardware and software sites
- 47. Software Sites • Arduino http://www.arduino.cc for software, user forum and playground • Ethernet Shields http://arduino.cc/en/ Reference/Ethernet • Pachhub http://www.pachube.com/
- 48. Hardware Sites • Spark Fun (US) http://www.sparkfun.com/ • Adafruit Industries (US) http:// www.adafruit.com/ • Electronic Goldmine (US) http:// www.goldmine-elec.com/
- 49. Other Sites • Lady Ada http://www.ladyada.net/ • Evil Mad Scientist http:// www.evilmadscientist.com/ • NY Resistor http://www.nycresistor.com/ • Make Zine http://makezine.com/