Hello guys,
recently if been reading about the LM35s to get a full range out of it.(check the datasheet on LM35 with full range using 2 Zdiodes.) but now the following question: if i use a Cat 5 cable do i still need 2 capacitors of 0.1uF on the 55mV pin and 150mV pin?
do i have to flip one of the capacitors?
and is there a possibility to only use one wire for the sensor in stead of using two?
sincerly yours
B
and is there a possibility to only use one wire for the sensor in stead of using two?
NO
You have to made "differential" mesure to avoid parasistic ground effect and eliminate the temperature effect on the threshold diode voltage..
If you have a look on the datasheet, (mine is National Semiconductor ed 2000), page 7 fig 7 you have to connect "+" wire on an analogic input and "-" wire on an second analogic input and made the différence by soft.
do i still need 2 capacitors of 0.1uF on the 55mV pin and 150mV pin?
The best is put capacitor beetwen the "+" wire and the "-" wire always to works in differential mode.
thanks a lot. that info was hard to get on the Internet.
tx!