Week -2

Simulink for Door bell Model

Objective:

Operation of the Door Bell using Simulink

1.Battery Source is provided to energise Solenoid Coil.

2.Switch is given for providing ON signal to energise the coil. Pulse Generator is given to generate the pulse signal.

3.Ideal Translational sensor is used and Electrical Reference should be given.

Operation:

When Battery supply is given along with the pulse generator,the solenoid coil get energised accordingly,the R-C contact will close and give the PS signal.

5.Scope is used to view the result .

Result:

Simulink for Temperature Sensing for different levels

Objective:

In order to maintain the temperature,Fan should be ON ,when it reaches 25 degrees and OFF Otherwise.

Temperature Circuit:

Controlled Temperature Block is used to generate the different temperature levels at different time levels.

Signal builder is used for giving variable Signals at the S Port .

Level 1:20 °C from 0 to 10 seconds,

Level 2:27 °C from 10 to 30 seconds,

Level 3:23 °C from 30 to 50 seconds

Thermistor is used to sense the temperature.When the temperature varies,resistance value at the thermistor vary.Accordingly, the voltage across it varies.

Electrical Circuit:

Battery source is given for thermistor.

Voltage Sensor is used to monitor the voltage variations according to the temperature.

Resistance is used across the voltage sensing block to measure voltage.

Relay is used to Switch ON and Off the Fan when temperature reached 25 degrees.

Switch ON and OFF values to be given for the relay.

When the voltage reaches the ON value of Relay(respective to the temperature change),FAN will ON.

OFF value to be given for switching OFF the FAN,When it goes below 25 degrees.

Temperature Scope

Fan ON/OFF Scope:

Relay gets ON(FAN ON) at the Temperature above 25 degrees(10 to 30 Secs).