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

[Richard]

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 <schip at santafe.edu> 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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