# Characteristics of the Thermometer

Characteristics of the Thermometer •NTC: •Input-range: 0 °C to 100 °C •Buzzer alarm, if temperature encreases 90 °C •Output on LCD :...

Prof. Dr. Franz Schubert

Prof. Dr. Franz Schubert

THERMOMETER

22.05.2013

Bussystems and Sensors

1

Characteristics of the Thermometer • NTC:

Temperature / °C

Resistor / kΩ

0

27,25

50

4,162

100

0,949

• Input-range: 0 °C to 100 °C • Buzzer alarm, if temperature encreases 90 °C • Output on LCD : 4 2 ° C 1 0 8

22.05.2013

° F

Bussystems and Sensors

2

Tasks for the Thermometer • Download the datasheet of the NTC-resistor (NTC 103-60) • Linearize the characteristic of the NTC in the range from 0 °C to 100 °C by connecting a serial resistor RL = R50 of the NTC. RΘ • Develop the resulting characteristic mT 

RΘ  RL

• Substitute the resulting characteristic by a straight line mL = f(Θ) 22.05.2013

Bussystems and Sensors

3

Θ/°C

RΘ/kΩ

mT

mL

Deviation/%

0 10 20 30 40 50 60 70 80 90 100

22.05.2013

Bussystems and Sensors

4

VCC (from USB)

Arduino Board

7

5V R

LCD-Module

L Pin 2

NTC

22.05.2013

GND

Bussystems and Sensors

5

Program of the Thermometer

22.05.2013

Bussystems and Sensors

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