Growing Food With Open Source (Sarah Sharp)
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The document discusses the development of a garden calendar tool and an automated watering system using Arduino technology. It covers various phases of the garden calendar tool including its integration with Google Calendar and issues faced, as well as the creation of an automated watering system with moisture sensors. Additionally, it emphasizes the need for timely frost alerts and provides resources for further involvement in gardening technology.
Growing Food With Open Source (Sarah Sharp)
- 1. Growing Food with Open Source OSCON 2011 Sarah Sharp @sarahsharp
- 2. Hello!
- 3. ✔ Linux Kernel hacker
- 4. ✔ Gardener
- 5. I'm still a lazy hacker
- 16. Garden Calendar tool ● 904 lines of C ● Object oriented representation of plants ● Takes a CSV file for input ● 11 magic fields ● not all are required oregon spring tomatoes,1,7,3,2010-04-13,0,75,.80,6,14,0
- 17. Garden Calendar tool: Phase I ● Started Feb 21, 2010 ● Plain text output on Mar 7, 2010
- 18. Issues with Phase I ● Worked pretty well ● Seed germination rates are optimistic! ● Often forgotten ● No integration with other calendaring tools
- 19. Garden Calendar tool: Phase II ● Goal: output iCalendar and integrate with google calendar. ● Issues: RFC 2445
- 21. Issues with Phase II ● Google calendar update lag ● Really should be a todo list ● Integration with Remember The Milk? ● Need an easy way to defer tasks ● Web front end? ● Storage for users
- 23. How Frost Works
- 24. How Gardeners deal with frost
- 25. Dealing with Spring Weather: “Cold Snaps” Data Source: WunderGround.com, Portland, Oregon, USA, April 2010
- 26. Lazy Hacker: Polling vs. Interrupts
- 27. Search for the Perfect Android App ● Need an alert for frosts ● Alert must be timely ● Nice: open source app Weather Checker
- 28. Search for the Perfect Android App ● Need an alert for frosts ● Alert must be timely ● Nice: open source app Weather Checker ● Alerts too often ● Alerts at the wrong time ● “average” temperature?
- 29. DIY
- 31. “You may not use the Wunderground Data Feed for use in a mobile application for mass distribution, even if there is no monetary cost for the mobile application.”
- 32. Open Government Data ● NOAA weather data ● No history, only future predictions ● Only for the United States ● SOAP interface that returns XML
- 34. Garden Weather Alert TODO ● Add a background task for alerts ● Alert on hail, wind, extreme heat ● Use GPS coordinates ● Support international locations ● Options for °F vs. °C
- 35. Automatic Watering with Arduinos
- 36. Garduino: Gardening + Arduino ● Automatically waters your plants based on soil moisture ● Good tutorial on instructables.com http://www.instructables.com/id/Garduino-Gardening-Arduino/
- 38. Soil Moisture Sensor Science V=I*R R = infinite ohms R is finite I = 0 amps I > 0 amps V = 0 volts V > 0 volts
- 39. Garduino Step 1: Build Soil Moisture Sensors
- 40. Garduino Step 2: Hello Blinky LEDs
- 41. Garduino Step 2: Hello Blinky LEDs
- 42. Garduino Step 2: Hello Blinky LEDs
- 43. Garduino Step 3: Hello digital output
- 44. Garduino Step 4: Set up watering system
- 45. Garduino Step 4: Set up watering system http://powerswitchtail.com/
- 46. Garduino Step 5: Calibrate System ● Soil moisture sensor takes a while to react ● Need Arduino code to: ● Limit how often the pump runs ● Don't water more often than N seconds ● Issues: ● No RTC on the Arduino ● Use milliseconds from start ● ~80 lines of code (with detailed comments)
- 47. Final Garduino Arduino wall power soil power moisture tail sensor switch
- 48. Garduino Demo
- 49. What's next? ● Wireless communication ● JeeNodes - $22 kit ● Finish irrigation system
- 50. Want get involved? ● http://www.gardengeek.org ● http://github.org/sarahsharp/GardenGeek ● Twitter/Identica: @gardengeekery
- 51. Thank you!