User Manual

Hexiwear Workstation

Page 25

DS1820 Digital

Temperature

Sensor

Enabling DS1820 Sensor

Hexiwear Workstation oﬀ ers 1-Wire

communication between DS1820

and the microcontroller over G0.3 or G4.5 pins. The selection of either

of those two lines is done using J2 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. The sensor may become

permanently damaged if it is not properly connected. It is a good practice

to turn oﬀ all unused peripherals that can interfere with the sensor, such

as pull-up/pull-down resistors, LEDs, and other devices that could share

the 1-Wire

communication line with the DS1820 sensor.

DS1820 is a digital temperature sensor that uses 1-Wire

interface for its 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 is powered by the

3.3V power rail of the Hexiwear Workstation board. It takes maximum of 750ms for the

DS1820 to calculate temperature with 9-bit resolution. 1-Wire

serial communication

allows data to be transferred over a single communication line. The main advantage

of such communication is that only a single pin is used. It is possible to connect

multiple sensors on the same 1-Wire

line. All slave devices by default have a unique

ID code, which enables the master to easily identify all slave devices sharing the same

line. Board provides a separate socket (TS1) for the DS1820. Communication line is

selected with the J2 jumper (Figure 26).

OTHER MODULES

VCC-3V3

TS1

DS1820

G4.5

G0.3

DATA BUS

Figure 26: DS1820 with

the schematic