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> Alternative Design For The Ppz, To solve all issues.
post Oct 17 2006, 02:01 AM
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I think the biggest issue so far, has been that of the keyboard. Feel free to disagree.

Everyone and their grandmother has had their own idea of what they want from this. I've been after a keyboard similar to a Universal or Clamshell Zaurus, some have wanted chorded keyboards, some folding belkin-style keyboards, some just want a slate.

How about just MAKING a slate, without a keyboard. I propose that a separate keyboard is produced, however the heck anyone wants it, that connects to a port on the bottom of the device. You can have it on a cable, folding, with a Zaurus-style hinge on it so that it folds over the slate part. Whatever. You could either use a USB/M-USB connector, or attach it to the internal keyboard pins, (As long as they're capable of hotplugging.) What you'd end up with is a thicker display unit, and a thinner keyboard that you could flip out. You could carry a blooming Sun Type 6 130 odd key USB model instead, if you felt like it.

In fact, put the ATA connector on the same port and put the hard disk in the keyboard. That'll bulk up the keyboard a it, slim down the base unit, and let you decide again whether you want a 2.5GB notebook drive (With an external PSU or LARGE extra battery) a 1.8" CF-type Microdrive, a 60GB iPod drive, or a 256MB Flash card. Whatever floats your boat.
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post Nov 2 2006, 07:33 PM
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no offence but i see you as misintrperting alot of the stuff i have said (leave the keyboard out of this sad.gif) personally your personal needs dont bother me, alot of it has helped push the platform into somthing other than "PDA". there are a couple of unseen motivations driving this board that i have not mentioned, for example this board has 3 I2C busses but i dont intend to have I2C devices in the project but run them to headers for one of my other projects where you need 3 busses (5 would be better)

there is good reason for splitting that way, logical design is one of them (or the zen of design). battery packs would use the same case as the keyboard, brining down the cost of such item

it allows for very easy hotswap of batteries. designing a battery holder for a removebale battery is not easy and not somthing i would look fowrd to, by making the battery unit semi self contained it allows me more internal room and to cut much neede thickness off of the design.

it also assists in heat managment. at the moment if the cpu and the battery were in the same case the battery would be over the top of ethier the bluetooth chip, power supply, cpu or wifi chip. these all generate heat. heat causes lithium battries to explode (lithium bieng the second most volitile element known to man after potassium, actually i wonder how much power you could get from a potasium battery wink.gif)

it really makes changing a battery easy, just slide it off and slide a new one on.

there are problems with the design, i am aware of that. one is multiple battery packs, that would mean you would have to purchase multiple IO boards. this needs thinking i can see several solutions but each has advantags and disadvanteges

with no battery in the CPU board the thickness of the base unit is about 4mm plus lcd screen thickness (4mm) plus case (about 2 mm) for comparison i mesure the c3000 screen at 8mm and the keyboard at 18mm

the battries i am looking at are 3.6v. at the current size i am looking at they cover 2x the area of a c3000 battery and are 1/2 as thick and are 2200maH. this relates to a power rating of 7.92W which is a bit more than a Z. the reason for calculating power and not beothering with voltage and current is that i am using a power converter in this design to reduce wasted power/losses

eg if you use a normal regulater to drop 5v @ 1A to 3v @ 1A you "lose" 2W ((5V-3V)*1A) now considering that the input power is 5W and the optput power is 3W you can see a loss of 40% of the power.

now before you start looking at the Z and wondering if thats where your battery life is going let me say its more complex than that and that the Z is probelly using the same tecnique as me to get a bit of extra power.

anyway back on topic, if i can get a battery as big as the screen then i would be happy, sure it will be pushed up againston IO board that produces heat as well but at least in the event of faliure you only lose the battery pack, the risks are minimised as well by the fact that the IO board should generate less head

ethier way i think i will push for usb audio if i can get it, it means more flexibility in design. i do intend to include sound on board if i can and i bileve that there is a good chance it will be however the modular bays are somthing that could make the customisation asspect easier and alot cheaper for all of us.

i did say audio but perhaps thats a bad thing as its a feature that everyone expects to have. but wifi and to a lesser extent bluetooth may be good choses for this. GPS is another as well as supprise suppries the phone. by making the phone a module it means that the sparkfun modules make it to my "to be considered list"

might add that i bought a HP rw 6828 pda pdone. its good but the one problem i have with it is that the that the headphones jack has alot of noise from everything else on the PCB, by modulrising everything in a common bay configration it allows me te come up with better RF shielding as i only have to do it for one cage and apply it to the rest.

IO boards are designed like PCI, ie just slot in no soldering required. i was thiing between a matchbox size and a 1/2 matchbox size unit.

also want to run this by you guys because its intresting, some new phones/pdas use the usb port as the headphone jack. what do you think. is this a good idea?
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post Nov 2 2006, 08:12 PM
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QUOTE(Da_Blitz @ Nov 2 2006, 06:33 PM)
it also assists in heat managment. at the moment if the cpu and the battery were in the same case the battery would be over the top of ethier the bluetooth chip, power supply, cpu or wifi chip. these all generate heat. heat causes lithium battries to explode (lithium bieng the second most volitile element known to man after potassium, actually i wonder how much power you could get from a potasium battery wink.gif)


Depends, you want to use it for electricity or for opening a locked door?? biggrin.gif
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Posts in this topic
Ferret-Simpson   Alternative Design For The Ppz   Oct 17 2006, 02:01 AM
Da_Blitz   that is a really good idea, provided i can come up...   Oct 17 2006, 03:14 AM
Da_Blitz   i might also add that every alternate keyboard des...   Oct 17 2006, 03:18 AM
morrijr   Now that is a *very* nice idea. As for securing t...   Oct 17 2006, 11:50 PM
Da_Blitz   i was thinking more like the psp with an external ...   Oct 18 2006, 12:51 AM
Ferret-Simpson   I knew I was a Genius!   Oct 22 2006, 01:17 PM
craigtyson   Ferret This Idea ties in realy well with a goal I...   Oct 22 2006, 04:05 PM
uMP2k   The description of something about PSP format with...   Oct 22 2006, 05:20 PM
BarryW   Wasn't there a pocket pc with a detachable key...   Oct 22 2006, 08:38 PM
stampsm   QUOTE(BarryW @ Oct 22 2006, 08:38 PM)Wasn...   Oct 23 2006, 01:02 AM
uMP2k   OMG - do I want one of those or what! Form fa...   Oct 22 2006, 11:19 PM
Da_Blitz   hahah, its 4:00 am here and i have work in about a...   Oct 23 2006, 10:28 AM
chiark   I had a nexio XP30, and it's the PDA that I...   Oct 24 2006, 12:50 AM
BarryW   QUOTE(chiark @ Oct 23 2006, 11:50 PM)I had a ...   Oct 24 2006, 12:34 PM
chiark   The idea was there, yes - definitely. I think the...   Oct 24 2006, 02:30 PM
Da_Blitz   QUOTEI personally don't want a view-only devic...   Oct 24 2006, 07:20 PM
stampsm   4 inch screen sounds good. sharp makes one LS040V7...   Oct 24 2006, 11:01 PM
chiark   No insult taken The nexio failed because whilst ...   Oct 25 2006, 01:24 AM
craigtyson   An odd idea I had in the bath last night.... Assu...   Oct 25 2006, 02:53 AM
wsuetholz   I like the idea of having the keyboard be a blueto...   Oct 25 2006, 10:21 AM
Da_Blitz   chiark: ill have to look at avalible LCD's bef...   Oct 26 2006, 07:44 PM
chiark   every 5" panel I know of runs at 800x480, so ...   Oct 27 2006, 05:27 AM
MONVMENTVM   I personally wouldn't like a detachable keyboa...   Nov 1 2006, 03:04 PM
Da_Blitz   the detachable keyboard is still a good idea if yo...   Nov 1 2006, 07:13 PM
BarryW   QUOTE(Da_Blitz @ Nov 1 2006, 06:13 PM)the det...   Nov 1 2006, 07:19 PM
Ferret-Simpson   I'd also prefer the sound card to be onboard, ...   Nov 2 2006, 12:45 AM
Da_Blitz   actually thats the thing i find funny, i say move ...   Nov 2 2006, 03:46 AM
stampsm   QUOTE(Da_Blitz @ Nov 2 2006, 03:46 AM)actuall...   Nov 3 2006, 04:14 AM
Da_Blitz   sorry missed a post, no battery in the screen/cpu ...   Nov 2 2006, 03:48 AM
Ferret-Simpson   QUOTE(Da_Blitz @ Nov 2 2006, 12:48 PM)no batt...   Nov 2 2006, 04:17 PM
Da_Blitz   no offence but i see you as misintrperting alot of...   Nov 2 2006, 07:33 PM
BarryW   QUOTE(Da_Blitz @ Nov 2 2006, 06:33 PM)it also...   Nov 2 2006, 08:12 PM
Da_Blitz   little from coulmn A and a little from coulmn B ...   Nov 3 2006, 12:31 AM
BarryW   QUOTE(Da_Blitz @ Nov 2 2006, 11:31 PM)little ...   Nov 3 2006, 01:00 AM
Ferret-Simpson   Sounds like fun. You never worked at Gillingham, d...   Nov 3 2006, 03:39 AM
chiark   I am really, really liking the suggestion on form ...   Nov 3 2006, 10:09 AM
Da_Blitz   i am assuming a 5" in 16:9 would be about the...   Nov 4 2006, 04:08 AM
Ragnorok   - I'm not against a two-piece design, the disc...   Dec 6 2006, 06:16 PM
stampsm   you could do what motorola does with some of thier...   Dec 6 2006, 11:01 PM
Da_Blitz   i guess the usb audio idea is really somthing that...   Dec 7 2006, 12:18 AM
stampsm   yep i am of the design mind that if you do not use...   Dec 7 2006, 12:29 AM
stampsm   QUOTE(stampsm @ Dec 7 2006, 12:29 AM)yep i am...   Dec 7 2006, 11:23 PM
Da_Blitz   i think by the time i finshed this it will be a ra...   Dec 7 2006, 02:11 AM
Da_Blitz   breaking this up into 2 posts because i feel ther...   Dec 7 2006, 02:24 AM
stampsm   a range of products actually sounds like a much be...   Dec 7 2006, 11:38 PM
stampsm   well if you do use a 16/9 wide screen format scree...   Dec 7 2006, 11:55 PM
Da_Blitz   nice pic actually i haad my eye on those keyfobs ...   Dec 9 2006, 02:44 AM

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