Week -2

1.Make a Simulink Model Of Door Bell

The blocks are used as per the question provided.

PS-Simulink convertor,display,scope,battery,solenoid,solver configuration,switch,Ideal translation motion sensor,electrical reference,mechanical reference.These are the blocks that are used in the Simulink

Model.

The condition given is that the switch is to be closed for 2 seconds & released.

In this the battery is connected to the switch and the negative terminal to the solenoid and the solenoid is connected to switch and completes the circuit.

Ideal Translational sensor is used to observe the physical momement of plunger.

As the time period of switch to the closed is 2 seconds,when switch is closed the plunger moves.

The movement of plunger is observed with ideal translational sensor and the sensor is connected to the scope.

Output:

2.Use a thermistor to sense the temperature of heater & turn on and turn off the fan.

Thermistor:Thermo-Resistor.It is a type of resistor whose resistance varies with respect to change in Temperature.Although

resistors resistence varies with temerature thermo resister is very sensitive to temperature.

Therimistor is used because it is cheap,accurate and is a easy way to measure temperature.

It is the signal builder.The plotting is based on the following,

1.0-10 sec temperature 20

2.10-30 sec temperature 27

3.30-50 sec temperature 23

Simulink Model

Blocks used in Simulink Model:

Signal Builder

Controlled Temperature source

DC voltage Source

Thermistor

Resistor

Switch,Constant,Display,Scope.

Explanation

In this signal builder is used to generate signal based on given conditions,then the controlled temperature sourse gives

input to themistor.

DC voltage source supplies 12v across resistor and voltage sensor.

The two constants used on the switch is it gives 1 if threshold is greater and 0 if threshold is lesser.

OUTPUT:

The Output states that the fan is turned on between the time range of 10 to 30 seconds.