Week -2

AIM:To make a simulink model of doorbell using solenoid block and also use thermistor to sense the temperature of heater & turn on and turn off the fan.

Objective: The simulink model of doorbell using the solenoid block must be made with the following details,when switch is closed the electromagnet receives power from the battery and pulls the metal arm to hit the bell producing sound and also create a situation where the switch is closed for 2 seconds and then released. the physical movement of the plunger must be observed.

The thermistror to sense the temperature of a heater & turn on and off the fan as per following conditions temperature sorce: 20 °C from 0 to 10 seconds, 27 °C from 10 to 30 seconds, 23 °C from 30 to 50 secondsFan conditions: ON if the temperature above 25 °C, OFF otherwise

Simulink block:

• At first open matlab and open simulink and create blank model.
• pulse generator is used to ring the bell for the given condtions and it is connected to PS convertor to convert signal to simulink to simscape signals.
• The inputs given to the pulse generator is show below.

• And then PS convertor is connected to switch and switch is connected to battery and the battery is connected to electrical reference .
• And a solenoid is placed and the solenoid is connected to the battery and switch at the electrical part of the solenoid.
• one end of the mechanical part of solenoid is connected to the mechanical reference and another end to the ideal translational motion sensor
• translational sensor motion sensor is used because the motion is translational and the sensor is connected to the solver.
• And then to the PS convertor and to the scope and display.

Pluse generator graph with out connecting to anything and connecting to the system it shown as below.

2.

• At first signal builder is connected to the PS convertor and to scope and the input is given to the signal builder.
• And then it is connected to the controlled temperature source and the source is connected to the solver and thermal reference.
• Then it is connected to the thermistor and the thermistor is connected to the voltage source and electrical reference and resistor is connected parllel to the voltage source to get even supply
• Voltage sensor is placed to sense the voltage and then it is connected to the PS convertor and to the thermistor.
• The voltage sensor is connected to the scope and display to show the output voltage and then to switch.
• The switch is connected to the scope to get the out put
• the threshold of switch is given for temperature 298k because the fan is on when the temperature is more than 25c.

Result: Simulink model of doorbell using solenoid block and also use thermistor to sense the temperature of heater & turn on and turn off the fan is done.