[Tinyos-help] addition of sensors to expansion port of telosb

[Richard]

Thank you sir.

Richard

Michael Schippling <schip at santafe.edu> wrote: Yup. Anything over 3 volts is wasted, and may overload the input pin.
Although as others have pointed out it's generally ok to over-voltage
even though the specs say not to.
MS


Richard wrote:
> Sir,
> 
> 
> Why is it that the range of my input into the telos ADC port must be 
> ranging from 0-3V? why 3V? is it because the battery supply is 3V? Thank 
> you.
> 
> 
> Richard
> 
> 
> */Michael Schippling /* wrote:
> 
>     Well, I would start by looking at the specs for my sensor
>     to see what kind of signal it puts out. If it's an analog
>     voltage and it's in the 0-3v range you can just connect
>     it to an ADC input and start programming. Otherwise you
>     may need a resistor ladder to reduce the voltage or an op
>     amp to amplify it. But it may be pulse-width encoded or
>     even serial data as I suggested.
> 
>     MS
> 
>     Richard wrote:
>      > Sir,
>      >
>      > I think we must create a board like the smiths-medical
>      > have the is compatible also for telosB. It can detect
>      > and output the pulse rate and the oxygen saturation.
>      > Also we could add the temperature sensor in there to
>      > have temperature reading to be send to the ADC port of
>      > telosB. But the problem is how could we start doing
>      > it? I have no idea on what to do first. Hope that
>      > someone could help me in my problems and give some
>      > suggestions on what to do. Thank you.
>      >
>      > Richard
>      >
>      >> Richard wrote:
>      >>> Sir:
>      >>>
>      >>>
>      >>> I have a problem in the connection of external
>      >> sensors like temperature
>      >>> and pulse oximeter to the expansion port of the
>      >> telosB. what are the
>      >>> ways to do it? do I need to design data
>      >> acquisition board for the
>      >>> external sensor before connecting it into the ADC
>      >> port located in the
>      >>> expansion port of telosB or is it connected
>      >> directly to the ADC port in
>      >>> telosB. please help me in this matter. Thank you.
>      >>>
>      >>> P.S. Pulse oximeter is using DB9 connector. Thank
>      >> you.
>      >>>
>      >>>
>      >>> Richard
>      >
>      >
>      >
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>     -- 
>     Platform: WinXP/Cygwin
>     TinyOS version: 1.x, Boomerang
>     Programmer: MIB510
>     Device(s): Mica2, MicaZ, Tmote
>     Sensor board: homebrew
> 
> 
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>  >

-- 
Platform: WinXP/Cygwin
TinyOS version: 1.x, Boomerang
Programmer: MIB510
Device(s): Mica2, MicaZ, Tmote
Sensor board: homebrew



       
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