Week -2

AIM: To make simulink model of doorbell using solenoid block and to make a simulink model of a thermistor to sense the temperature of heater and turn off the fan as per the temperature conditions.

DOORBELL USING SOLENOID:

The solenold is a electromagnet. On passing current through the conducting wiresa magnetic field is generated around it which atrracts magentic materials. This phenomenon is used in the bell. When the switch of the bell is pressed the current passes through the circuit, exciting the electromagnet and pulling the plunger towards the metal portion. this prouduces a ringing sound.

SIMULINK MODEL:

FAN CONTROL BY THERMISTOR:

Thermistor is a sensor which is used to measure the temperature of the surrounding by comparing it with known temperature and resistance values.

0-10 seconds 20 degree celsius

10-30 seconds 27 degree celsius

30-50 seconds 30 degree celesius

SIMULINK MODEL:

SIGNAL INPUT:

SIGNAL OUTPUT:

from the switch output we can see that, only output is between 10-30 seconds as the tempeature is greater than 25 degree celsius. so, this output can be given to Fan for the simulation.