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Author Topic: Mark I Portable Electrick Storage Device  (Read 4590 times)
Robotguy
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« on: June 21, 2010, 06:36:23 am »

Gadzooks! I finished a project! Well, it's at a useful stage anyway...

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:
 
(Click images for larger pics)


Outside


Open


Foot


Power Switch


USB Connectors


And a shot of it charging my iPad

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 128x128 OLED screen
  • Embedded wireless web server (WRT54G based)

If anyone is interested, I can post pics/schematics of the internals and build process.
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arcwelder
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« Reply #1 on: June 21, 2010, 06:53:14 am »

I have two conflicting reactions to this. Firstly, I like the look of the box you found / made / modified for this.

However...damn, that's a huge boost charger. Usually I see these built into an Altoids tin.
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Hektor Plasm
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« Reply #2 on: June 21, 2010, 09:06:48 pm »

However...damn, that's a huge boost charger. Usually I see these built into an Altoids tin.

Tsk tsk, Arcwelder- I would expect you to want more current!  Wink

HP
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arcwelder
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« Reply #3 on: June 21, 2010, 09:09:15 pm »

Tsk tsk, Arcwelder- I would expect you to want more current!  Wink

Not into my ICs. The magic smoke needs to stay where it belongs.
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T.Taylor the Third
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« Reply #4 on: June 22, 2010, 07:29:08 am »

I actually like the large size, I could never quite rap my head around a charger being smaller than the device its charging
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Reverend Panic
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« Reply #5 on: June 22, 2010, 09:45:58 am »

I'd love a copy of the schematics please Shocked
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arcwelder
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« Reply #6 on: June 22, 2010, 10:01:12 am »

I'd love a copy of the schematics please Shocked

Huge version, 2xAA version, or 9V version?
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Armored Rah
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« Reply #7 on: June 22, 2010, 10:18:38 am »

I'd love a copy of the schematics please Shocked


I'd like some more details too please. I'm always in need of something to charge USB devices and this is more like the number of charges I've been looking for.
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arcwelder
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« Reply #8 on: June 22, 2010, 10:34:16 am »

If you're coming down in voltage, then you mainly just get a standard power IC circuit like if you're using an ADC wall wart as your supply. If you're going up from 2xAA, it gets a tad more complicated, but there's still an IC for that. If you're going for the normal pocket size, 2xAA is probably best since they store more energy than a 9V, while the space required is roughly the same in either case.

You can find out pretty much everything you need on the Minty Boost project site. This is more applicable to the 2xAA version but links to some 9V versions.

In part, this is simple because there's no "smart charging" or other frills to worry about. A battery charger could (should) get a bit more involved than a USB charger.
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Kiltar
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« Reply #9 on: June 22, 2010, 12:18:57 pm »

Gorgeous & functional - top notch work! I heartily applaud your steampunky creativity and imagination in solving a very modern problem. Well done!

K
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Robotguy
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« Reply #10 on: June 23, 2010, 04:00:05 am »

Thanks all for the kind comments.

I have added some more build pics and a schematic to my blog post:
http://robotguy.net/blog/2010/06/21/portable-electrick-storage-device-mark-i/

The converter is a PT78ST105H from Texas Instruments. It can put out 1.5A at 5V, just enough to charge the iPad, plenty for everything else. It is about 85% efficient over the normal range of charging currents, so not too much power is used up in the converter.

I got the iPad/iPod pinout from here (http://pinouts.ru/PortableDevices/ipod_pinout.shtml) along with the description of how to get the newer iPods to believe they are connected to a charger. See the schematic for more details.

I think next I am going to work on the steam power plant. I plan on having a flywheel and piston run by a motor, with a USB humidifier to provide the "steam."

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Robotguy
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« Reply #11 on: June 24, 2010, 05:54:16 am »


Got a little work done on the "power plant" tonight.

First the inspiration:

Slice and stain a bit of balsa wood:


Chop off a chunk of 1.75" ID acrylic tube and clean up on the lathe:


Glue a piece of 1/16" acrylic on the end (which later got rounded to fit on the lathe):


Test fit the slats with rubber bands. Almost didn't have enough to go all the way around:


Now slice some bands from thin brass:


Solder the bands into place:


And voila!


Oh yeah! I also picked up a USB humidifier from Ebay for creating the "steam"
Spoiler (click to show/hide)
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