RE: Proposal for iPaq Touchscreen systems (in place of CBUS Switches)

["Stephen McGarry" <Selfbuild@xxxxxxxxxxxxxxxxxx>]

I think you will find most of the current is needed for charging the
battery. So if you've removed the battery then the PSU can be quite small
(probably 200mA or so). Remember this iPaq has to run for hours of a small
battery so cant use much power in operation.

Stephen

-----Original Message-----
From: Gareth Cook [mailto:g@xxxxxxx]
Sent: 11 September 2004 08:02
To: ukha_d@xxxxxxx
Subject: Fw: [ukha_d] Proposal for iPaq Touchscreen systems (in place of
CBUS Switches)


For point 5 on using the lighting ring, here are the power requirements
for an iPaq h2215

http://hpshopping.speedera.net/www.shopping.hp.com/shopping/data_sheet/fa15=
9
a.html

AC Power:
AC Input: 100~240 Vac, 50/60 Hz; AC Input current: 0.2 Aac max
Output Voltage: 5Vdc (typical); Output Current: 2A (typical)

Also, that model has integrated bluetooth, but if there's one with builti=
n
wifi then that's got to be better (range, etc).

G.

Gareth Cook
SWG EMEA North Account Manager
IBM SWG - BTE Office - Lotus Park, Staines, TW18 3AG
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
email: g@xxxxxxx


----- Forwarded by Gareth Cook/UK/IBM on 11/09/2004 07:57 -----

Discussion
Main Topic

Gareth Cook <g@xxxxxxx>
Today 07:53

.
Subject:
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[ukha_d] Proposal for iPaq Touchscreen systems (in place of CBUS Switches=
)
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Category:



I've been having a think, and it's woken me up early so here goes. I
started off by asking about using touchscreens (in addition to CBUS
switches) I started to think of the practicalities of getting these into
the walls as a replacement for the CBus switches - the costs are
comparable (iPaq =A3150 / CBUS Switch =A3150).

Using a colour touchscreen would give infinitely more variations of
control that a static switch could, and if we assume at this stage the
process of web browser control back to the CBUS network (and others) is
achievable we need to work on the logistics of such an install - if it
can't be done neatly, I won't do it at all.

Assumptions here

...There is a standard light switch there already, it will be
"CBUS"ed.
...iPaq will be flush mounted in the wall - requiring a large area behind
to be knocked out.


Firstly, we know we need to run a CAT5 cable to the CBUS Switch to delive=
r

data and power. Now, what if we used this cable to deliver power and data
to the iPaq ?

1. Looking at the iPaq website, one of the units states it needs 5V @ 2A.
This is achievable, and eBuyer do a generic PoE adaptor which will delive=
r

5V @ 2.5A. We can remove the inbuilt lithium battery as if the iPaq needs
a kick, we can do it from Node0. You don't want to have to keep pulling i=
t

out of the wall !
2. Network you think would be easy - but this will require a CF card to
RJ45 - will have to get a unit to look at the space needed for this in th=
e

wall.

If an iPaq were to be used, then this will require a fairly deep hole in
the wall - but at least it may be possible to dig out a British double
gang standard hole which could be then retrofitted back to a British ligh=
t

switch of sorts (as opposed to a J box that CBUS requires).

3. An alternative network source is of course a built in wifi or CF wifi
card - but hey if a cable is there, I'd prefer it.

Another idea struck me - but the electrical bods out there may have to
confirm this - we have a standard light switch there already delivering
power to the light (and the light is going to be changed to a star wire,
hence rendering the power to the light switch out of commission)

4. Use the lighting ring to power the ipaq - the iPaq needs 12V @2A - can
we mount the PSU for the iPaq in the wall and connect to the light ring t=
o

be powered ? May need some hacking to the PSU module itself.
5. With the method in point 4, we would need to use a WiFi card - but tha=
t

means NO retrofitting of CAT5 for CBUS. I like this method :-)

Comments appreciated - have I had a mad moment or is this workable ?

G.

Gareth Cook
SWG EMEA North Account Manager
IBM SWG - BTE Office - Lotus Park, Staines, TW18 3AG
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
email: g@xxxxxxx



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