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.

1.Door Bell

Simulink Model:

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 port c is 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.

Output :-

2.Thermistor

Given Inputs:

Temperature source: 20 °C from O 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 Temperature source represents an ideal source of thermal energy,that can maintain a controlled temperature difference regardless of the heat flow rate. The temperature difference is set by the physical signal port S. A positive temperature difference causes the temperature at port B to be greater 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 signal.
• 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.

Output :-

When temp below 298K

When temp greater than 298k