Week -2

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

Simulation Diagram:

Results:

First 2 seconds the bell will ring and remaining time will in rest mode.

2 Ans:

Aim To run the fan for given conditions

condition:

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

shematic diagram:

To find the room the temperature using NTC thermistor,

R=R0eB(1/T−1/T0)

T0= Intial temperature(reference)
T1= final temperature
R0= resistance at T0
R1= resistance at T1

r1 = 100 ohm series onnected resistance

v2= voltage acroos the thermistor

To Find the R
use the formula
R=(r1*V2)/(Vin-V2)

here using the dc motor instead of fan

Results:

10 to 30 Seconds fan was in on mode remaing all times up to 50 seconds it will be in off mode.