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 <[EMAIL PROTECTED]>/* 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 > > > > > > > > ____________________________________________________________________________________ > > Be a better friend, newshound, and > > know-it-all with Yahoo! Mobile. Try it now. > http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > > -- > Platform: WinXP/Cygwin > TinyOS version: 1.x, Boomerang > Programmer: MIB510 > Device(s): Mica2, MicaZ, Tmote > Sensor board: homebrew > > > ------------------------------------------------------------------------ > Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try > it now. > <http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > > > -- Platform: WinXP/Cygwin TinyOS version: 1.x, Boomerang Programmer: MIB510 Device(s): Mica2, MicaZ, Tmote Sensor board: homebrew _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
