Week -2

AIM:

To create a simulink model of door bell using solenoid block.

OBJECTIVE:

An electric bell is worked based on the electromechanical principle.when an electric current is given to the input by switch it produces a repetative buzzing or ringing sound.An electric bell consists of a electromagnetic coil wound with insulated wire on the iron bar,which attracts the iron with clamper when it energize.When the current passes through the circuit the colis becomes energize and produces the magnnetic flux,which leads to stike the bell.

INPUT SIGNAL:

Signal bulider is used to provide the input signal to the bolck initially.By giving the values from 0 to 2 which we can generate a pulse with respective time period.By changing the period from 4 it contains both on and off state and pulse width to 50 and phase delay with 2 sec respectively.output od pulse generator is connected to the scope 1.

The output is connected to the switch using smiulink ps converter to convert simulink signal into physical signal and connected to battery to form a closed circuit.

SOLINOID:

Solenoid is a type of electro magnet used in many electro mechanical circuits.Main purpose of this coil is used to make the magnetic field around the coil when it energize.The coil is produce the uniform magnetic field.This coil is wound with the copper wire around many turns.When the current flows to the circuit and it becomes to produce magnetic flux.

IDEAL TRANSLATION MOTION SENSOR:

Its a sensor used to sense the movement of plunger,when there is a electrical input is given to the circuit(which is in closed condition)

SPRING:

spring is used to take a action of strees and strain on the pluger.

OUTPUT:

The above scope is used to see the results of this block.It shows that the plunger position with the respective state.it shows that the initial 2 sec it is in off positionand it becomes constant and it shows there is no action in plunger.The time period from 0to2 the plunger becomes go to negative state and moves towards the bell for a ringing action.

CONCLUSION:

The simulink model of dooe bell using solenoid blockset is obtained.

THERMISTOR:

AIM:

To create a simulink model to sense the temperature of heater and turn on or off time for fan as per the contition.

1. Fan is on when temperature is more than 25 degree celsius,off

2.Temperature 20*c from 0 to 10 sec,27*c from 10 to 30,23*c from 30to50

OBJECTIVE:

A thermistor is a type of resistancethermometer whose resistance is based on temperature.Its mainly used in many industries to find the temperature depended on resistance.

SIMULINK MODEL:

Initially we find the threshold voltage using the costant block and get the values for further simulation.By the way we take the reference temperature as a 25degree celsius.The constant temperature value is 298 which is reference temperature and connected with the controlled tempereture block.Temperature source signal is provided by using the repeating sequence block.Which generates the signals and waveforms.The constant blocks 0 and 1 are used as a switch on and switch off condition respectively.

CONCLUSION:

From the above output form 0to10sec the temperature value is 293k so the fan is in off condition.then the period from 10to30sec the temperature becomes 300k so the fan in on condition.from 30to50sec temperature becomes 296 which is lesser than the reference temperature si the fan in off condition.ahaence obtained