Week -2

1. Make a Simulink model of Doorbell using Solenoid block

AIM: Make a Simulink model of Doorbell using Solenoid block

DOORBELL:

The Main part of a doorbell is an electromagnet. ... When you press a doorbell button, The switch is closed for 2 sec and realsed , When switch is closed its complete an electrical circuit that allows household electricity to flow through the doorbell's internal electromagnet. The magnetic field generated by the electromagnet is then used to power a mechanism that creates the doorbell sound.

SOLENOID:

A solenoid is a device comprised of a coil of wire, the housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in. More simply, a solenoid converts electrical energy into mechanical work.

WORKING PRINCIPLE OF DOORBELL BY USING SOLENOID :

. When doorbell switch is presssed The switch is closed

. At the time switch is closed the circuit will be closed for 2 sec and released , when switch is pressed current flows through the circuit

. The Electromagnet is powerd and generates a magnetic feild that attracts the iron strip towards it

. The striker strikes the bell its sounds for 2 sec

. The contact is broken and current stops flowing through the circuit

. This cause the electromagnet to loose its magnetic feild

. The contacte spring arm returns the striker to its original position

. The contact restored and current flows through circuit

. The process is repeated from the beginning

Blocks used for model

1. Solenoid

2. switch

3. Battery

4. Pulse generator

5. Ideal translational motion sensor

6. Mechanical translational reference

7. Electrical reference

8. Solver coniguration

9. simulink -PS converter

10. scope

SIMULINK MODEL

IMPORTANT POINT

Set the pulse generator block parameter as shown below

Amplitude

Period

pulse width

phase delay

INPUT

OUTPUT : The switch is closed for 2 second and released we will record the value with the help of scope block you can see flactuation in below output waveform

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

CONCLUSION :

1.

The Main part of a doorbell is an electromagnet. ... When you press a doorbell button, The switch is closed for 2 sec and realsed , When switch is closed its complete an electrical circuit that allows household electricity to flow through the doorbell's internal electromagnet. The magnetic field generated by the electromagnet is then used to power a mechanism that creates the doorbell sound.

0-2sec the output is null from 2-4 sec its gives oscillation in output

2. using thermister to sense the temperature of a heater and turn on or turn off the fan