Week -2

1.

model of Doorbell using solenoid block

in above figure i have used Pulse Generator , solenoid, and translational motion sensor, Here i haved used pulse Generator for creating 2 second contact for bell , when ever current passes through solenoid magentic field generates and R moves towards C to cature this motion i haved used Ideal translational sensor. whose outop is given to scope . output wave form is as below.

2. Fan controlled by Thermistor

In this i used a signal generator to build signal of 20 ,27 ,23 degree celcius. Output of signal Generator is fed to controled temprature souce which models physical heat which can be sensed by thermistor. Now Based on the Heat themister will cgange its resistance it is given by

R(T) = R0*exp(B*(1/T-1/T0)) where R0 = 1000 ohms , T0= 298.15 and T1 is input temp in Kelvin

and based on the resistence current flowes through resistor measuring voltage across it and giving specific conditon to swith that it should send 0 or 1 . At voltage of 0.01293 switch send 1 which makes DC motor to rotate, this can be observed by ideal rotation motion sensor. and Wave form is given Below