Week -2

1) Make a Simulink model of Doorbell using solenoid block.

Blocks that is used in doorbell simulink model:-

• The pulse generator is used to create square wave pulses at regular intervals.
• The Solenoid block is connected with switch and battery that we get a complete electrical circuit.
• The port c is connected with mechanical reference.
• The ideal translational sensor is connected with solenoid block R to observe the movement of the plunger.
• Scope is connected with the ideal translational sensor to get the output and the PS-Simulink converter is used to convert the physical signal to simulink signal.
• Solver Configuration Each physical network represented by a connected simscape blocks requires solver setting information for simulation.

Waveforms Results as per conditions

Pulse Generator

O/P Waveform

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. And where the switch is closed for 2 seconds and then it released. The physical movements results are shown in waveforms.

2) Use a thermistor to sense the temperature of a heater & turn on or turn off the fan.

Simulink Model

Explanation:-

• A Repeating Sequence Stair is given as input to the thermistor through a controlled temperature source.
• Battery and a resistor is connected in the thermistor circuit.
• A voltage sensor was given accross this resistor to measure the voltage change during different temperature inputs. The resistance of this resistor can be set to any value, but it should not be changed once the threshold voltage is found.
• For 0-10 secs fan is in OFF condition, because temperature is 293K which is below 298K. After 10 secs temperature goes to 300K, so fan will turn ON, because temperature exceeds 298K. After 30 secs fan will turn OFF because temperature goes to 296K which is below 298K. From the above results the given condition has beensatisfied.