Hi Georgia, This is not an internal temperature sensor, it's a Sensirion SHT21 Humidity/temperature sensor, so you should use the formula from its datasheet: http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf
Andris On Sun, Nov 13, 2011 at 5:41 PM, Geo Gkolfin <[email protected]> wrote: > Hello! > I am trying to sample the internal sensor of a telosb mote. > At TempC.nc I have > module TempC{ > ... > uses interface Read<uint16_t> as Temp; > ... > } > and at TempAppC.nc > implementation{ > ... > components TempC; > components new SensirionSht11C() as Temp; > ... > TempC.Temp->Temp.Temperature; > ... > } > In TempC.nc I call read() and I print the uint16_t data returned by > Temp.readDone. > It is about 6200. In order to convert this value to Celsius I follow the > instructions given in > tinyos-2.1.0/tos/chips/msp430/sensors/Msp430InternalTemperatureC.nc > I multiply the value with 1.5 and I divide the result by 4096. Then I > subtract 0.986 and I divide with 0.00355. > Unfortunately this formula return a huge value, about 350. No way my room is > that hot! :-) > On the other hand I found > (http://www.eecs.iu-bremen.de/wiki/index.php/TinyOS) the following > conversions formulas: > -40+0.01*data and > -38.4+0.0098*data > Those give nicer results, but...which one should I use? Neither of them give > the exact same result as my thermometer but they are both quite close. And > why the conversion formula given in Msp430InternalTemperatureC.nc does not > work? > Thank in advance, > Georgia > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
