android, without batteries

Android, without batteries

Running commercial devices without batteries

Overview Slides

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…

In this Talk• A look at batteries• How battery reporting works• Changes required for using a power supply• Demo• Handling USB devices

What’s in a Battery ?

-ve or GND

+ve, aka Vcc (3.7V-4.2V)

Battery DetectTHERM for temperature sensing

Android Battery Stack

Kernel

FrameworkApplication

Fuel Gauge

Battery Charger

Battery Reporting, Actions

Higher LevelDecisions

Using a Power Supply• Considerations for power supply• Always present• 100% level• Modify• Kernel• Framework

Demo

USB Peripherals• Often used in applications• Supplying power is a problem• >500 ma?

• Solution : Y cable