Week -2

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

Here we use electromagnet process in which we use both electrical and mechanical source, Power which we passes through the battery is elcetric source and the bell is known to be a mechanical device,

The circuit we used is mentioned below the input is supplied through the pluse generator which is connected to the switch to give input. Later the connection is going from switch to battery solenoid and Ideal Configuration motion sensor.

• Battery - It is ectrical device use to supply power to circuit,
• Switch - Switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another.
• Solenoid - It consists of a spring, houseing and moveable pluger its known to convert electrical energy to mechanical energy.
• Ideal Translation motion sensor - It is a device that converts an across variable measured between two mechanical translational nodes into a control signal proportional to velocity or position.
• Pulse generator - We use this to give input to the function. The input is shown as below.

the ouput we used to get by this as mentioned below is indicates the pluger moving.

Conclusion - the simulink model of Door bell is obtained.

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

- Temperature source: 20 °C from 0 to 10 seconds, 27 °C from 10 to 30 seconds, 23 °C from 30 to 50 seconds

Fan conditions: ON if the temperature above 25 °C, OFF otherwise.

The whole concept is works on the temperature input

Thermistors are used as temperature sensors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in temperature.

The block is as shown below.

In this we have used Battery, signal builder, thermistor, Switch and source block.

Battery is used to tranmit power to the circuit. Signal builder is used provide the input according to temperature in which we use to convert the degree to kelvin if its is 20' menas add the keliv contast value 273 the total valuse we given in signal bulider is 293k.

Switch - Switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another.

Initially we have given input 25' by using the constant block in that we have recorded the value in scope that we have given the condition to switch.

and the input we have given to sgnal builder is

Output

Conclusion-

From the plot initially fron 0-10sec the plot is linear becuse the temperature value is 293 which is less than the reference value hence the fan is in off condition and in the time period from 10-30sec the variation is observed because the temp is 300k which is greater than the reference value and the contidion is 296 at time period 30-50sec which is less than the reference value hence the fan will be in off ondition.