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Power

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electricity 101

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https://www.flickr.com/photos/marktee/9223003535 electricity = water

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https://www.flickr.com/photos/marktee/9223003535 usb/power cables = garden hose

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amps vs. volts

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amperage

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voltage

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volts * amps = watts!

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power considerations

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how much power does each device draw, 
 according to the manufacturer's specs?

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how much power can the 
 surge protector support?

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how much power can each usb hub support?

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build to support your most power-hungry devices

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power problems

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power problems won’t accept a charge cycle on/off forever won’t turn on blinking battery can’t hold a charge someone stole the battery

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http://www.microsoft.com/surface/en-us/support/warranty-service-and-recovery/

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troubleshooting

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start simple

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"When you see hoof prints, look for horses, not zebras"

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isolate the problem

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DEVICE HARDWARE SOFTWARE

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DEVICE HARDWARE cables charging port peripherals SOFTWARE battery display

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DEVICE HARDWARE SOFTWARE apps operating system your base image cables charging port peripherals battery display

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why?

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•devices drew too much power ! •devices weren’t getting enough power ! •bad USB cables / peripherals ! •bad software ! •bad device

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iterating on power

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v1 - power strips

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v2 - stupid USB hubs

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v3 - better USB hubs

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Cambrionix hub

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Cambrionix hub • 32 ports • smart power delegation • fault indicator • disables problem devices

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v4 - better cabling/monitoring

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energy consumption

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pro power tips

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http://iheartorganizing.blogspot.com/2012/03/you-asked-organizing-cords.html

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have spares/duplicates as back-ups

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have extra cables handy for people to steal