Internal pressure sensor

raul1 at raul1 at
Mon Oct 5 15:13:28 CEST 2009

Stroller schrieb:
> 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  
>>> just
>>>> 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 $10 for a single unit? That seems
>>> remarkably good value.
>>> One would expect a pressure sensor to be much cheaper on the 1000, of
>>> course.
>> well, my thought was just: marketshare. more features out of the box  
>>> more customers > more competition.
>> and i dont think 10$ make adifference, not yet talking about  
>> largeqty-volumes.  eg rfid: nokia announces it since years, but FR  
>> could be fo 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  
> Freerunner production.
> 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?
> Stroller.
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I thought of adding this pressuresensor and using the freerunner as a
gps-varioaltimeter for flying some time ago, but I think the display
wont be readable in sunlight. And i would prefer hardwarebuttons while

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