User`s guide

The LM35 is a low-cost precision
integrated-circuit temperature sensor,
whose output voltage is linearly
proportional to the Celsius (Centigrade)
temperature. The LM35 thus has an
advantage over linear temperature
sensors calibrated in ° Kelvin, as the
user is not required to subtract a large
constant voltage from its output to
obtain convenient Centigrade scaling.
It has a linear +10.0 mV/°C scale factor
and less than 60 μA current drain. As it
draws only 60 μA from its supply, it has
very low self-heating, less than 0.1°C in
still air. EasyMx PRO™ v7 enables you
to get analog readings from the LM35
sensor in restricted temperature range
from +2ºC to +150ºC. Board provides a
separate socket (TS2) for
the LM35 sensor in TO-92
plastic packaging. Readings
are done with microcontroller
using single analog input line,
which is selected with jumper
J10. Jumper connects the sensor
with either PD4 or PD7 microcontroller
pins.
page 35
J10
PD4
PD7
DATA BUS
Figure 21-5: LM35 connected to PD4 pin
EasyMx PRO
™
v7 enables you to get analog readings from the LM35 sensor
using PD4 or PD7 microcontroller pins. The selection of either of those two
lines is done using J10 jumper. When placing the sensor in the socket make
sure that half-circle on the board’s silkscreen markings matches the rounded
part of the LM35 sensor. If you accidently connect the sensor the other way,
it can be permanently damaged and you might need to replace it with another
one. During the readings of the sensor, make sure that no other device uses the
selected analog line, because it may interfere with the readings.
Figure 21-1:
LM35 not
connected
Figure 21-2:
LM35 placed
in socket
Figure 21-3:
LM35
connected
to PD4 pin
Figure 21-4:
LM35
connected
to PD7 pin
Enabling LM35 Sensor
1 2 3 4
LM35 - Analog
Temperature Sensor
other modules
EasyMx PRO
v7