Temperature Control - fischertechnik ROBOTICS TXT Discovery Set Manual

TXT
Discovery Set

Temperature Control

At home where you live, a new air
conditioning system has been installed. Of
course, you immediately asked the plumber
how the temperature control works. He was happy to explain
to you that a temperature sensor continually measures the temperature.
As soon as a maximum value is exceeded, the air conditioning is
switched on. However, if the temperature is below the minimum value,
the air conditioning is switched off and the heating turned on. Now
you need to try to program a control circuit based on the "temperature
control" model. But first, build the model.
Task: (Level 1)
The heating is simulated by lens tip lamp M2. The fan at output M1
serves as the "air conditioning unit". An NTC thermistor at input I8 is
used to measure the temperature.
Program the model so that above a certain temperature value the
heating is shut off and the fan is turned on. This is to cool the house
until a minimum value is reached. Then the fan is to be shut off
and the heating turned on.
Programming Tips:
Please note! The resistance of the NTC thermistor decreases with
increasing temperature. Therefore, the upper temperature limit is
the smallest value for I8. The fan should switch on when this limit is
reached. The lower temperature limit is the largest value for I8. The
heating should switch on when this limit is reached.
You can see the value of I8 at room temperature using the interface test.
Turn on the indicator light M2 and observe how much the value
decreases. Now switch on the fan to find out how much the value
increases. Use this as a basis for selecting the limits for heating and
cooling.
You can open the finished program by clicking on the icon on the
right.
ROBOTICS
18
Temperature_control.rpp