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Android, without batteries
Running commercial devices without batteries
Overview Slides
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Motivation• Android is now the most popular OS• Android devices have it all• connectivity, location, processing power & multimedia• Great choice to make solution centric custom devices
• Making custom devices is expensive!• What if a common phone/tablet could be used for prototyping ?• Interested ? This talk shows you how…
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In this Talk• A look at batteries• How battery reporting works• Changes required for using a power supply• Demo• Handling USB devices
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What’s in a Battery ?
-ve or GND
+ve, aka Vcc (3.7V-4.2V)
Battery DetectTHERM for temperature sensing
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Android Battery Stack
Kernel
FrameworkApplication
Fuel Gauge
Battery Charger
Battery Reporting, Actions
Higher LevelDecisions
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Using a Power Supply• Considerations for power supply• Always present• 100% level• Modify• Kernel• Framework
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Demo
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USB Peripherals• Often used in applications• Supplying power is a problem• >500 ma?
• Solution : Y cable