Title
: Do some research and explore more about the LM35DZ.
Objective
: To study about the LM35DZ.
Contents
/ Procedure : Search about the LM35DZ principle and its functions.
Results
/ Analysis :
1)
The
definition :
LM35
is an integrated circuit sensor that can be used to measure temperature with an
electrical output proportional to the temperature (in oC).
2) The reasons why the LM35DZ will be
use to measure temperature:
a) It can measure temperature more
accurately than a using a thermistor.
b) The sensor circuitry is sealed and
not subject to oxidation, etc.
c) The LM35 generates a higher output
voltage than thermocouples and may not require that the output voltage be
amplified.
3) The operation principle :
a) It has an output voltage that is
proportional to the Celsius temperature.
b) The scale factor is .01V/oC
c) The LM35 does not require any
external calibration or trimming and maintains an accuracy of +/-0.4 oC
at room temperature and +/- 0.8 oC over a range of 0 oC
to +100oC.
d) Another important characteristic of
the LM35DZ is that it draws only 60 micro amps from its supply and possesses a
low self-heating capability. The sensor self-heating causes less than 0.1 oC
temperature rise in still air.
4) How to use the LM35DZ
a) Need to use a voltmeter to sense
Vout.
b) The output voltage is converted to
temperature by a simple conversion factor.
c) The sensor has a sensitivity of 10mV
/ oC.
d) Use a conversion factor that is the
reciprocal, that is 100 oC/V.
e) The general equation used to convert
output voltage to temperature is:
i. Temperature ( oC)
= Vout * (100 oC/V)
ii. So if Vout is 1V ,
then, Temperature = 100 oC
iii. The output voltage varies linearly
with temperature.
Conclusion:
From the research, the LM35DZ can be used to measure the temperature for the
Smart Chicken Coop.
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