Growing Food With Open Source (Sarah Sharp)

Growing Foodwith Open Source OSCON 2011 Sarah Sharp @sarahsharp

Hello!

✔ Linux Kernel hacker

✔ Gardener

Im still a lazy hacker

github.com/sarahsharp/GardenGeek

Problem #1: Scheduling

Garden Calendar tool● 904 lines of C● Object oriented representation of plants● Takes a CSV file for input ● 11 magic fields ● not all are requiredoregon spring tomatoes,1,7,3,2010-04-13,0,75,.80,6,14,0

Garden Calendar tool: Phase I● Started Feb 21, 2010● Plain text output on Mar 7, 2010

Issues with Phase I● Worked pretty well● Seed germination rates are optimistic!● Often forgotten● No integration with other calendaring tools

Garden Calendar tool: Phase II● Goal: output iCalendar and integrate with google calendar.● Issues: RFC 2445

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

Problem #2: Frost

How Frost Works

How Gardeners deal with frost

Dealing with Spring Weather: “Cold Snaps” Data Source: WunderGround.com, Portland, Oregon, USA, April 2010

Lazy Hacker: Polling vs. Interrupts

Search for the Perfect Android App● Need an alert for frosts● Alert must be timely● Nice: open source app Weather Checker

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?

“You may not use the Wunderground Data Feed for use in a mobileapplication for mass distribution, even ifthere is no monetary cost for the mobile application.”

Open Government Data● NOAA weather data● No history, only future predictions● Only for the United States● SOAP interface that returns XML

Garden Weather Alert

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

Automatic Watering with Arduinos

Garduino: Gardening + Arduino ● Automatically waters your plants based on soil moisture ● Good tutorial on instructables.comhttp://www.instructables.com/id/Garduino-Gardening-Arduino/

Soil Moisture Sensorhttp://www.cheapvegetablegardener.com/2009/11/how-to-make-cheap-soil-moisture-sensor-2.html

Soil Moisture Sensor Science V=I*RR = infinite ohms R is finiteI = 0 amps I > 0 ampsV = 0 volts V > 0 volts

Garduino Step 1:Build Soil Moisture Sensors

Garduino Step 2:Hello Blinky LEDs

Garduino Step 3:Hello digital output

Garduino Step 4:Set up watering system

Garduino Step 4:Set up watering system http://powerswitchtail.com/

Garduino Step 5: Calibrate System● Soil moisture sensor takes a while to react● Need Arduino code to: ● Limit how often the pump runs ● Dont water more often than N seconds● Issues: ● No RTC on the Arduino ● Use milliseconds from start● ~80 lines of code (with detailed comments)

Final GarduinoArduino wall power soil power moisture tail sensor switch

Garduino Demo

Whats next?● Wireless communication ● JeeNodes - $22 kit● Finish irrigation system

Want get involved?● http://www.gardengeek.org● http://github.org/sarahsharp/GardenGeek● Twitter/Identica: @gardengeekery

Thank you!

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Growing Food With Open Source (Sarah Sharp)

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