Challenge

Week -2

Aim:- to plot a simulink model for doorbell using solenoid block

to sense the temperatute of a heater &turn on and turn off the fan using thermistor

FOR QUESTION 1:-

DOOEBELL:- it is a device it having the mechanical and electrical components and it produces the buzzer sound by pressing the button

while pressing the switch the circuit loop is complete which causes the current flow through the circuitwith this

passing the solenoid it generates the electromagnet at desired space,it allows the plunger to move due to which presence

of bell and it produses the sound

SOLENOID:- the solenood is a device it s made up of coil by wounding, and a movable armature .thic solenood can be convertes

into the electrical emergy to mechanical energy of work.

IN THE SIMULINK I USED THE BLOCKS TO GET THE OUTPUT:-

1)Pulse generator:-this block generates the wave pulses at regular intervalas.it is used to determine the shape of the outputwaveform.

2)Simulink ps converter:-it is the conversion of simulink signal of inout into a physical signal.

3)Switch:-it is controlled by external physical signal

4)Battery:-it gives the power to the closed loop

5)Electrical referance :-it the connection to electrical ground

6)Solenoid:-it generates the force of solenoid

SIMULINK MODEL FOR THE DOORBELL:-

OUTPUT: it gives the output in the form of waveforms with the help of scope block

FOR QUESTION 2:-

Aim:- To use a thermistor to sense the temperature of a heater &turn on or turn off the fan as per the beliw the conditions

Conditions are:-20 degree celcius from 0 to 10 seconds, 27 degree celcius from 10 to 30 seconds,

23 degree celcius from 30 to 50 seconds

Fan Condition:-ON if the tenperature above 25degree centigrade ,OFF otherwise

Simulink model:-

Explanation:- as per the given conditons the time and temperature give the values to signal builder

Signal builder values:-

Switch threshold value:-

here itn is a simulink ps converter it converts the simulink signal into physical signal
the signal will be passes to thermistor which is connected to a battery
the voltage sensor is connected to measure the voltage as a thershold value for the condition of out circuit
as per fan condition that ON if the temprature above 25 degree celcius ,off otherwise. we use a switch and provide a thershold value
if the signal value is greterthan than thereshold value then it turn ON otherwise it goes to OFF state

OUTPUT:-

The temprature is 20 deg celcius (293k) then fan is off for the first 10 sec when the temperature reaches 25 deg celcius

(300k) then fan is off the next 20 sec and the temperature comes to to 23 deg celcius (296k) fan goes to OFF state

CONCLUSION:-

In this way, in first question we use the solenoid it converts electrical energy into mechanical energy and made a simulink

model into a doorbell

in the second question, we use the thermistor to sense the temperature and according to given condition ,

we put the threshold value to the switch for turn on and turn off the FAN.

Ship work like this
in your own course.