Week -2
Aim :
Preparing the Simulink model for Doorbell and a thermistor to sense the heater temperature.
Objective :
1.Make a Simulink model of Doorbell using solenoid block with the following details:
- In the above arrangement, when the switch is closed the electromagnet receives electrical power from the battery and pulls the metal arm to hit the bell producing sound.
- Create a situation where the switch is closed for 2 seconds and then released. Observe the physical movement of the plunger.
2.Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:
- 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.
1.Simulink model:
- Pulse generator is used to generate the pulse as it is simulink blog, to connect to switch 'simulink-ps convertor' is used.
- To get electricity battery is used and electrical reference also.
- To ring the doorbell soleniod is used followed by ideal translational motion sensor which senses the translational motion.
- For output scope is used which are connected by 'ps-simulink convertors'.
- To close a switch for 2 seconds and release neccessary changes are made.
Outputs:
Velocity:
Position:
2.Simulink model:
- As per requirements temperature sources are 20' at 0-10 seconds, 27' at 10-30 seconds and 23' at 30-50 seconds; fan should 'ON' when temperature greater than 25' otherwise 'OFF'.
- As per these signal are generated through signal generator.
Outputs:
Velocity:
Angular displacements:
Results:
In doorbell the graphs shows that for every 2seconds pulses are generated.
In thermistor model as we want fan will be in 'Off" mode when temperature is less than 25 degrees.
Upto 10sec the temperature is below 25' which is 20' so the velocity is zero, between 10 -30 sec the temperature is 27' which is greater than 25' so the velocity is high but again after 30 seconds the temperature falls to 23' so the velocity is zero again.