Challenge

Week -2

1.Simulink model for doorbell using solenoid:

Aim:

To create a Simulink model of a doorbell which is controlled by solenoid.

Simulink model:

Components of the circuit:

Working of Doorbell circuit:

The input switch of the doorbell is simulated by a pulse generator with a period of 4 seconds with 50% duty cycle. So, it will generate the ON time of 2 seconds.
This will drive the logic-controlled switch PS to operate the solenoid in the duty of 2 sec ON 2 sec OFF.
The operation of the solenoid is verified by the translational sensor. The scope waveform shows the solenoid is ON for 2 sec and off for 2 sec.

Solenoid position:

2.Simulation model of thermistor-controlled cooling fan:

Aim:

Make a Simulink model to control the cooling fan. Fan should be ON when temperature of the source exceeds 25 ˚C.

Temperature source dutyè0 to 10 sec 20 ˚C, 10 to 30 sec 27 ˚C, 30 to 50 sec 23 ˚C.

Simulink Circuit:

Critical components of the circuit:

Working of the circuit:

The temperature of the source is controlled by the input given by signal builder. Temperature of the source is set as per the requirement 0 to 10 sec 20 ˚C, 10 to 30 sec 27 ˚C, 30 to 50 sec 23 ˚
Thermistor chosen for the model is NTC and its reference temperature is 25˚ sensing resistor value is set as 1KᲲ. Battery voltage is set as 110VDC.
The voltage drop across the sensing resistor is captured and converted into logic level 0 and 1. This logic will control the voltage source of the DC motor.
1 means On and 0 means OFF. When the temperature is above 25˚C, the motor will turn on and that can be verified by the rotational motion sensor output.

Input signal as Temperature:

Fan ON/OFF status:

Result:

The Simulink model of the doorbell and the thermistor-controlled fan is done and the output waveforms are also attached for the verification.

Ship work like this
in your own course.