Week -2

Aim: 

To stimulate doorbell and heater using Matlab 

Objective: 

The observe the doorbell for every 2 sec closed and released 

To use a thermistor and to turn on and off the heater with the given temperature 

Requirements: 

Matlab,simulink,simscape 

Process of working the doorbell: 

• When the switch is on current is flowed through the circuit 
• Electromagnet generates a magnetic field 
• And it strikes the bell 
• When the arm strikes circuit gets a break 

• And it again connects to the orginal position 
• This process again gets repeated 

Procedure: 

We have used solenoid, battery, ideal translational sensor and switch 

Solenoid: solenoid is taken from the Simulink library, the battery is taken which act as a physical signal 

The solenoid r and c port is connected to the ports of the sensor we use display blocks 

The output sensor is the physical signal we have to connect using ps simulator 

We have to provide electrical reference to solenoid and mechanical reference to sensor 

As the given we have to give the inputs according to the question. 

inputs:

outputs:

Heater: 

Using a thermistor to sense the heater to on and off the fan for the given tempetarure 

0 to 10 sec –20 degree 

10-30sec-27 degree 

30 to 50sec-25 degree 

The requirements are thermistor,controlled temperature source,voltage,resistance,battery,signal builder,electrical reference,thermal reference,switch 

Thermistor:thermistor is a resistor whose electrical reference changes according to temperature changeSingal builder is taken and given the temperature values in kelvin and time is given as 10secControlled temperature source in which the temperature values are varied in this and gives the signal thermistor is connected to battery,resistor and voltage 

Volatge sensor and resistance are given with thresold value while on and off 

procedure:

• a signal builder is given according to the conditions
• fan should be off below 25 degree and on above
• ps converter is used to change the signal into physical signal
• voltage source is given
• thermistor is given which changes according to the temperature
• ps converter is used to convert into output signal
• solver configuration is given to give the required parameters 

 inputs:

outputs:

conclusion:

the physical movement in the door bell has been observed

temperature is sensed by the thermistor in the heater model