Portable Electrick Storage Device – Mark I

My daughter has swim meets every Saturday morning from 7am until around 1pm. During this time she is actually swimming a total of about 4 minutes, so the entire family tries to stay occupied the rest of the day. Almost every week someone complains “Oh, man! My iPod is dead!” Answering the tinkerer’s call to arms, I would like to present the Portable Electrick Storage Device Mark I:

Outside

Inside

USB Connectors

Charging my iPad

Schematic

Closeup of foot

Battery and Connectors

Internal partition

The yellow piece is some scrap expanded PVC left over from a laptop desk I built for my wife a while back. The PCB is mounted to this, opposite the battery.

Partition & chamfer

The bottom of the partition is chamfered and held into place by another piece on the bottom. This lets it set into place easily, but still holds the battery in place tightly.

Specs:

  • Box – $6 brand new at the local thrift store, I only added electronics and handles. (I need to head back and get a couple more!)
  • Battery – 12V 7Ah (~12 iPod charges or 3.5 iPad charges)
  • Output – 5V @ 1.5A (will charge iPad while watching video)
  • Connectors – 3x USB Type-A female
  • 3A fuse directly on battery
  • Power switch with blue LED indicator

Plans for the future:

  • “Working” steam power plant
  • Microcontroller based monitor (Battery charge level, internal temp, etc) with 128×128 OLED screen
  • Embedded wireless web server (WRT54G based)

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