DQ
PA7
PB4
VCC-BRD
J18
R31
1K
VCC
DQ
GND
D
AT
A BUS
VCC-BRD
C12
100nF
DS1820 - Digital
Temperature Sensor
DS1820 is a digital temperature
sensor that uses
1-wire®
interface
for it’s operation. It is
capable of measuring temperatures
within the range of -55 to 128°C,
and provides ±0.5°C accuracy for
temperatures within the range of -10 to
85°C. It requires 3V to 5.5V power supply
for stable operation. It takes maximum
of 750ms for the DS1820 to calculate
temperature with 9-bit resolution.
1-wire® serial communication
enables
data to be transferred over a single
communication line, while the process
itself is under the control of the master
microcontroller. The advantage of
such communication is that only one
microcontroller pin is used. Multiple
sensors can be connected on the same
line. All slave devices by default have
a unique ID code, which enables the
master device to easily identify all
devices sharing the same interface.
EasyAVR
™
v7 provides a separate socket
(
TS1
) for the DS1820. Communication
line with the microcontroller is connected
via jumper
J18
.
EasyAVR
™
v7 enables you to establish 1-wire® communication between
DS1820
and the microcontroller via
PB4
or
PA7
microcontroller pins. The selection of either
of those two lines is done using
J18
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 DS1820 sensor. If you accidentally connect the sensor the other way, it
may be permanently damaged. Make sure to disconnect other peripherals (except
1-wire), LEDs and additional pull-up or pull-down resistors from the interface lines
in order not to interfere with signal/data integrity.
Figure 14-1:
DS1820 not
connected
Figure 14-2:
DS1820
placed in
socket
Figure 14-3:
DS1820
connected
to PB4 pin
Figure 14-4:
DS1820
connected
to PA7 pin
Figure 14-5:
DS1820
connected
to PB4 pin
Enabling DS1820 Sensor
1
2
3
4
page 24
modules
Easy
AVR
v7
