Week -2
Simulink Model EXxplanation; The pulse generator is used to creat square wave pluse at regular intervals.the blockwave parameter and the amplitude pulswe width period and the phases delay detemine the shape of the outputwave from
.The switch blockis used is controllled by external physicl signal.the external signal is greater than the thesold parameter then the switch is closed the switch is open .The ideal translantion sensor is connected with solenoid block R to observer the moment of the plunger .ps-simulink converter is used to convert the physical singal to simulink signal .scope is connected with the ideal translantional .the solenoid block is connected with switch and battery and we will get it complete electrical circuit
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
.SIMULINK MODEL EXPLANATION Singale builder block is used to input the values as per given condition; At point1, Time=0 second ,Temperature=293K
At point1, Time=0 second ,Temperature=293K
At point2, Time=10 second ,Temperature=293K
At point3, Time=10 second ,Temperature=300K
At point4, Time=30 second ,Temperature=300K
At point5, Time=30 second ,Temperature=296K
At point6, Time=50 second ,Temperature=296K
The controlledted temperature source represent an ideal source of thermal energy that can maintain a controlled temperature the regardless of the heat flow rate .The temperature differnce ragardless of the heat rate flow. A Postive temperature different causes the temperature at a port B to be greater than the temperature at a port A. Thermistor is a type resistor whose the resisanc eis based upon temperature. the linear resistor is used is used inorder to control the amount of currentfrpom battery . voltage source which represencres dc or ac .electrical reference block is give
Time period given is 2second to the pulse generator to open and colsed the solenoid block receives electrical power from battery power from the battery and plunger move from port R TO Chit the bell produse the sound . 
For 0to10 s fan is off condition because temperrature is 293k which is below the thesold 298k after 10s temperature goes to 300k then the switch will be in ON condition tempature exceeds after 298k 30s fan off as the trun off as the temperature come down to 296k which slois below the thresold temperature of the 298k