Week -2

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

solution:

bloks used: solenoid, motion sensor, pulse generator, DC Battery, scope, switch are major bloks

• the on time of switch is set to 2 sec
• when switch closes then the solenoid produces magnitic force.
• due to that force the plunger starts attracting and hit the bell then the sound will produce.
• here the movement of the plunger shows by using motion sensor block.
• when the switch is off then the force developed by the solenoid is zero.
• then the plunger comes to rest position by making oscillations.
• the ocsillations are depend on the damping and spring constant.

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

bloks: signal builder, controlled temperature source, thermister, battery, voltage sensor, switch, scope, resistor.

according to given condition we developed

20 deg cent (293.15k) for 0 to 10sec

27 deg cent (300.15k) for 10 to 30 sec

23 deg-cent(297.15k) for 30 t0 50sec by using signal builder block.

at different temperatures the thermister produced different voltages.

here the result is showing with the help of switch.

from the duration 10 to 30sec the temp is >25deg-cent.

we developed condition that the switch closed when the temperature > 25 deg-centi that is in tha duration 10-30sec.