Week -2

Aim:

1. Make a Simulink model of Doorbell using a solenoid block with the following details:
2. Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:

Theory:

Make a Simulink model of Doorbell using a solenoid block with the following details: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.

In Simulink, the electrical components and links are represented by the blue color and mechanical components by the green color.

Pulse generator: The pulse generator is a Simulink block that generates the pulse according to the time. The pulses generator generates the pulses in the interval of 2 seconds. (the signal scope is attached in the report).

Switch: The switch which is used in the project is a simple on and off switch. the on/off is controlled by the pulse generator. The switch is on for 2sec. and off for 2 sec.

Battery: The battery provides the voltage to the solenoid.

Ideal Transmission Motion sensor: This block is measured and detects the motion and the velocity of the plunger.

Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:

The arrangement is set up using different blocks of the Simscape and Simulink. the signal is transferred from the signal generator. the signal generator generates the signal for different temperatures of the heater w.r.t. time. the signal transfer to the temperature-controlled source blocks which differ the temperature regardless of the heat flow. The temperature is connected to the NTC-thermistor. Thermistors are temperature-dependent resistors, changing resistance with changes in temperature. the nominal resistance is 1000 ohms at 298K (25`degree`C). the thermistor is connected with the voltage sensor which senses the voltage. the logic switch is used to on/off the fan. The Threshold voltage of the switch is 5.975 if the voltage crosses the threshold the fan will start otherwise it remain stopped. the battery and resistors are used to provide the voltage and resistance. the solver configuration is used with the physical system.

When the switch is ON the ideal angular velocity source generates a velocity differential at its terminals that is proportional to the physical input signal. which is connected to the DC motor. which represents the fan. The Ideal Rotational Motion Sensor senses the angular velocity.

Results:

Make a Simulink model of Doorbell using a solenoid block with the following details:

a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions

Conclusion :

• Hence the bell will ring at the interval of 2s.
• The fan will start when the temperature reaches 25`degree`C and above.

Pulse Generator :

Signal: