Slides for the Edge Workshop

1. Making things sense
Urban sensing and physical computing
Day 2 (7-8 May 2011)
Markus Rittenbruch
QUT Urban Informatics / FAST & NICTA

2. Schedule - Day 2
• 12:00 - 12:10 Introduction
• 12:10 - 12:30 Analogue sensors
• 12:30 - 13:00 Activity
• 13:00 - 14:00 Sharing sensor data
• 14:00 - 14:10 Short break
• 14:10 - 16:10 Project activity
• 16:10 - 16:50 Project presentations
• 16:50 - 17:00 Wrap up

3. Making things sense - Day 2

4. Programming

5. Programming
Data types
When variables are made to exceed their maximum capacity they "roll over" back to their minimum capacity, note that this happens in both
directions.
int x
x = -32,768;
x = x - 1; // x now contains 32,767 - rolls over in neg. direction
x = 32,767;
x = x + 1; // x now contains -32,768 - rolls over
Float & casting:

6. Programming
Float & casting:
int x;
int y;
float z;
x = 1;
y = x / 2; // y now contains 0, ints can't hold fractions
z = (float)x / 2.0; // z now contains .5 (you have to use 2.0, not 2)

7. Resources
• Language reference:
• http://www.arduino.cc/en/Reference/HomePage
• http://arduino.cc/en/Reference/Extended
• General code library:
• http://arduino.cc/en/Reference/Libraries
• Interfacing with hardware:
• http://www.arduino.cc/playground/Main/InterfacingWithHardware
• Examples
• http://arduino.cc/en/Tutorial/HomePage

8. Analogue sensors

9. Analogue sensor pins
• Use analogue in pins 0-5 for analogRead()
• Address as 14-19 when used as digital pins
• digitalWrite(), digitalRead()
• No pinMode required for analogRead();

10. Analogue sensor input
• File/Examples/Analog/AnalogInput

11. Analogue sensor input

12. Programming Conditionals
http://www.ladyada.net/learn/arduino/lesson5.html

13. AnalogInput

14. Calibration -
part 1

15. Calibration - part 2
• map(): remap a number from one range to another
• val = map(val, 0, 1023, 0, 255);
• constrain(): constrain to a number range

16. Project activity 1 -
Calibration

17. Components
• RGB LED:

18. Components
• LED matrix
http://www.sparkfun.com/datasheets/Components/LED/YSM-1288CR3G2C.pdf

19. Components
• MAX7219 LED driver
http://arduino.cc/playground/Main/MAX72XXHardware
http://www.arduino.cc/playground/Main/LEDMatrix

20. Project activity II -
Projects

21. So, you’ve got an Arduino
and now you want to
make it talk

22. Or, maybe you want to
talk to it...

23. ...from the other side of the world

24. This session of the workshop will
show you some ways of doing that.

25. Arduino to the world
• Arduino direct to Pachube via ethernet/wifi
shield
• Or Arduino to PC via serial, then to
Pachube/Twitter
• We’re taking the second approach in this
workshop, since the kits we provided don’t
include ethernet/wifi shields

26. Step 1: Register a feed
on Pachube

29. Step 2: Write some
code

30. Arduino Sketch

31. Ruby “Bridge”: setup

32. Ruby “Bridge”: the loop

33. Step 3: See your data
on Pachube

35. Advanced topics
• PCB design
• Wireless communication
• Xbee
• Bluetooth
• Wifi
• Infrared
• Radio
• Real-time communication
• Multi-tasking

36. Resources
• http://apiwiki.twitter.com/
• http://community.pachube.com/api
• http://community.pachube.com/tutorials
• http://community.pachube.com/triggers/
twitter

37. What next?
• Hackerspace Brisbane
• http://hackerspaces.org/wiki/Hackerspace_Brisbane
• Living Dolls (The Edge)
• http://edgeqld.org.au/blog/2011/04/07/living-dolls/