Hi,
due to the last interesting new grove module I would propose to share the develpment of an Autonomous Solar Sensor reader that will give those informations from the backyard :
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camera (http://www.seeedstudio.com/wiki/Grove_-_Mini_Camera) : to see who is coming in the backyard
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moisture value to know if we must activate or not the sprinkler (http://seeedstudio.com/wiki/Grove_-_Moisture_Sensor)
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Temperature and Humidity (http://www.seeedstudio.com/wiki/Grove_-_Temperature_and_Humidity_Sensor_Pro)
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Air Quality : http://www.instructables.com/id/How-To-Build-Your-Own-Outdoor-Pagoda-for-Weather-/
http://www.instructables.com/id/Indoor-Environmental-Quality-station-Bluetooth-T/ -
with solar charger :
http://www.seeedstudio.com/depot/3w-solar-panel-138x160-p-954.html?cPath=1_2
http://www.seeedstudio.com/wiki/index.php?title=Lipo_Rider_Pro
So if you still have experience about this autonomous use please share it.
Have a nice day,
Miguipda 