Week -2

PROJECT NAME : SIMULINK MODEL FOR DOORBELL & THERMISTOR

Aim :

1) To make simulink model for doorbell using solenoid block

2) To use thermistor to sense temperature of a heater and turn ON / OFF fan

1) DOORBELL

simulink model explanation :

we have used following blocks in the model -

1. PULSE GENERATOR

2. SWITCH

3. BATTERY

4. SOLENOID

5. IDEAL TRANSLATIONAL MOTOR SENSOR

6. MECHANICAL TRANSLATIONAL REFERENCE

7. ELECTRICAL REFERENCE

8. SCOPE

As per given conditions switch is closed for 2 seconds & then released .

RESULTS :

CONCLUSION FOR DOORBELL :

Time period input is giving for 2 seconds in the pulse generator to open & close the switch. When switch is closed the solenoid block receives electrical power from the battery and plunger moves from port R to C to hit the bell & produce sound . By reducing the spring constant value & increasing the damping value vibrations will be reduced .

THERMISTOR : temperature - 20 from 0 to 10 seconds , 27 from 10 to 30 seconds , 23 from 30 to 50 seconds.

Fan conditions - ON if temperature above 25 degrees ,OFF otherwise.

SIMULINK MODEL EXPLANATION :

SIGNAL building block is added to input the values as per given conditions .

At point 1, time = 0 sec . to 10 sec & Temperature = 293k

At point 2, time = 10 sec to 30 sec & Temperature = 300k

At point 3, time = 30 sec to 50 sec & Temperature = 296K

RESULT :

from 0 - 10 seconds fan is OFF because the temperature is 293K which is below 298K , after 10 seconds it goes to 300K , so fan will turn ON because temperature exceeds 298K . after 30 seconds fan will turn OFF because temperature goes 296K less than 298K .