Week -2

1.The switch gets the signal from the pulse generator. The switch controls the solenoid and the soleniod controls the switch.

when the solenoid is ON the doorbell will ring and when the solenoid is OFF the doorbell will stop ringing.

2.The signal builder generates the signal which is fed to the thermistor via controlled temperature source. The thershold value for the switch is the output value from the voltage sensor when the temperature when it is 25 degeree celsius. So when the temerature is above 25 the fan will rotate.