E a s y M x
P R O
v 7 a
U s e r M a n u a l
P A G E 33
Enabling LM35 sensor
LM35 module view
LM35 - ANALOG
TEMP. SENSOR
MODULES
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 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 v7a 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 DIP switch
SW14
. Switch connects the sensor with PC0
microcontroller pin.
EasyMx PRO v7a for STM32 enables you to get analog readings from the LM35
sensor using PC0 microcontroller pin. The connection is done placing SW14.7
DIP switch to ON position. 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 accidentally 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.
C29
100nF
1
2
3
4
5
6
7
8
O
N
SW14
PC0
LM35
D
AT
A BUS
R79
100
LM35 connected to PC0 pin schematic
