Hello sir Alan! =3D) For example, sir, without touching first the thermistor, I get a 30.27 reading. When I put it in my armpit, the reading goes up rapidly before i= t slows down to about 36.65, but still goes up slowly and for a very very l= ong time by 0.01 degree increments. Why is this so? Any explanation and solut= ion to this problem? Thank you so much. Best regards. "Alan B. Pearce" wrote: >The current is 200uA. I try to display the temperature data on an LCD, b= ut the >reading takes more than 10 minutes to be stable, meaning the change is v= ery >little. Why is this so? How big are the variations you are getting? remember that if you could do= a step change of the temperature the resistance of the thermistor is going = to follow a curve similar to the charge or discharge curve of a capacitor because of thermal inertia, that is to say the thermistor will not instantaneously change temperature, but will take a certain time to reach= the new temperature. Also if the thermistor is not thermally bonded to a (relatively) large ma= ss any draft of air around it will cause it to change temperature (typically= cool off) which may show on your readout if it is sensitive enough. This will easily change the temperature 0.1C and often up to 0.5C just by wavi= ng your hand to disturb the air around it. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads ____________________________________________________________________ Get free email and a permanent address at http://www.netaddress.com/?N=3D= 1 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads