Week -2

Aim:

To make a simulink model of a doorbell using solenoid block.
To use a thermistor to sense the temperature of a heater & turn on or
turn off the fan.

Simulink Model Explanation:

.The pulse generator is used to create square wave pulses at
regular intervals.The block waveform parameters Amplitude.pulse
width,period and phase delay.determine the shape of the output
waveform.

The switch block used is controlled by external physical signal.If

the external signal is greater than the thresold parameter then the
switch is closed, otherwise switch is open.

.The positive terminal of the switch is connected to switch and the

negative terminal is connected to the electrical reference.

The Solenoid block is connected with switch and battery and we
will get a complete electrical circuit.The portcis connected with

mechanical reference

The ideal translational sensor is connected with solenoid block R

to observe the movement of the plunger
Scope is connected with the ideal translational sensor to get the
output.

PS-Simulink converter is used to convert the physical signal to
simulink signal
Solver Configuration:Each physical network represented by a
connected simscape blocks requires solver setting information for

simulation

2.Thermistor

Given Inputs:

Temperature source: 20 °c from 0 to 10 seconds, 27°C from 10 to 30

seconds, 23 °C from 30 to 50 seconds

Fan conditions: ON if the temperature above 25 °C, OFF otherwise

Simulink Model Explanation:

Signal Builder block is uded to input the values as per given

Conditions:

At point 1,Time=0 seconds, Temperature=293 K

At point 2,Time=10 seconds,Temperature=293 K

At point 3,Time=10 seconds, Temperature=300 K

At point 4,Time=30 seconds, Temperature= 300 K

At point 5, Time=30 seconds, Temperature=296 K

At point 6,Time=50 seconds,Temperature=296 K

Controlled remperature source represents an ideal source of
thermal energy,that can maintain a controlled temperature
difference regardless of the heat fiow rate. The temperature
difference is set by the physical signal port S. A positive
temperature difference causes the temperature at port B to be

Ireater than the temperature at port A.
Thermistor is a type resistor whose resistanc eis based upon

temperature.

A linear resistor is used is used inorder to control the amount of
current from thebattery.

The voltage sensor is used to convert the voltage measured
between two points into a physical signa.
Voltage source which represenrs dc or ac
electrical reference block is given

Solver Configuration:Each physical network represented by a

connected simscape blocks requires solver setting information for
simulation.