Week -2

Aim-

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

model link

for the first 2 second the electrical circuit is closed and the doorbell rings.At time =2 second the circuit breaks and the spring pull thre plunger back its originalpostion. Now because of the spring stiffness the plunger oscillated for about half a second which is nothing for about half a second which is nothing effect.

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

Temperature is 20 c from 0 to 10 seconds

Temperature is 27c from 10 to 30 seconds

Temperature is 23c from 30 to 50 seconds

To generate the temperature condition a signal builder is used with a controlled temperature source.The signal builder generates a simulink signal which varies with time as defined.

Here in the model from signal builder we have created temperature profile signal according to time duration requirments.

which onwards converated to physcial signal through converter block and send it to controlled temperature source block.

Controlled Tempeeature Source block is used to controlle the temperature from outupt of signal block and further output temperature is given to thermistor.

Two referance is used electrical and mechanical refrence is used.

Thermositer is used to sence the temperature and according to which voltage is supplied to further

switch block is used to give outpur according to voltage supply is given

scope is used to get varies output result.

INPUT SIGNAL.

In the given below graph we can see the different temperature for differtent time frame

OUTPUT VOLTAGE

In the below graph we see different voltage vlue for differnt time frame

OUTPUT SWITCH

RESULT

The output is as expected. The fan is ON when temperature is greater than 25 degrees which is in between 10 -30 sec and OFF otherwise . And SOC of battery decreases during Fan operation period only.