Internal pressure sensor
stroller at stellar.eclipse.co.uk
Sun Oct 4 17:55:18 CEST 2009
On 4 Oct 2009, at 16:14, tom wrote:
>> > On Wed, Sep 30, 2009 at 06:04:30PM -0400, tom wrote:
>> >> actually i think they should already be built in...they are so
>> >> cheap...
>> > Depends on what you mean when you say cheap. I see it listed at
>> > under USD 10 for one sensor or the price of a 1.3 mpix camera
>> > module. It's
>> > also not as small as you would like for something you throw in
>> > mostly for
>> > fun.
>> Is the 1.3 mpix camera module also $10 for a single unit? That seems
>> remarkably good value.
>> One would expect a pressure sensor to be much cheaper on the 1000, of
> well, my thought was just: marketshare. more features out of the box
> > more customers > more competition.
> and i dont think 10$ make adifference, not yet talking about
> largeqty-volumes. eg rfid: nokia announces it since years, but FR
> could be fo fast...im sorry, maybe im just to optimistic...
1) Please don't top-post in reply to a bottom-post. It makes the flow
of the conversation difficult to read.
2) Please don't post to the list in HTML. Plain-text is preferable.
3) The costs of production were discussed a LOT on this list in the
past, when the Openmoko team was still active. To be honest, even if
the component is only $1 then it may be too expensive, as many more
design and testing costs are added to the total production cost by the
addition of the component.
Customers will be dissatisfied if it doesn't work as expected. A large
increase in market share is needed to make the addition worthwhile.
Therefore the addition of a camera may be worthwhile, whereas the
addition of a barometric sensor is not.
However a camera requires retooling of the Freerunner's case, a
surprisingly cost-prohibitive change. I think the cost of creating a
new case for the Freerunner is considerably more than $10,000. I would
imagine that a camera requires other components to make it work and is
more complex from the design point of view. There have historically
been two major complaints about the Freerunner - lack of a camera and
of 3G. Either might enlarge its market share considerably, but both
were rejected on cost grounds.
This barometer is self-contained and connected to the i2c bus, a
_relatively_ simple addition. If there is demand for the barometer -
although I'm inclined to agree with Rask that there wouldn't be - then
it might it be justified to add it were Brazil ever to go into
A 1.3mp camera would produce complaints that it's a poor specification
compared to the iPhone. Hardly anyone would be grateful for the
addition of the barometric sensor.
TBH, if the Freerunner were in reliable, long-term production, I might
be able to imagine a market for Freerunners amongst hang-glider
pilots. I think a person might be able to make a living adding
Christoph's sensor and selling Freerunners with varioaltimeter
software installed. The software would have to be closed-source,
however, to make a livelihood out of it and realistically it might
take a year to get the software to an acceptable quality for
commercial sales (and still longer to build-up market share). The
author might need to write anti-piracy measures into the code, and
what is to prevent a determined attacker from patching the kernel to
report a different IMEA number to the altimeter software?
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