Week -2

AIM: To make simulink model of doorbell using solenoid block

Main Component used-

solenoid:

A solenoid is a device comprised of a coil of wire, the housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in. More simply, a solenoid converts electrical energy into mechanical work.

switch:

switch is a component used to complete/connet or disconnect electrical system.

battery:

A battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices.

MODEL

Result

Working

when switch is closed, input given by Pulse generator(period is 5sec) circuit completed and solenoid produce magnetic field that attracts iron strip towards it and Doorbell turn on.

In simulation Ideal translation motion sensor sense the displacement and can be seen in scope by converting physical to simulink converter(As shown in above fig.).

AIM: Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per below conditions

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.

Thermistor:

Thermistors are temperature-dependent resistors, changing resistance with changes in temperature. The term is a combination of “thermal” and “resistor”. It is made of metallic oxides, pressed into a bead, disk, or cylindrical shape and then encapsulated with an impermeable material such as epoxy or glass.

Switch:

switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric. here we used comparible switch whos thresold value is 0.01099 after this value switch is on.

WORKING:

First we connect constant input of 297°K to the Controlled Temperature Source to find out the thresold value of switch.

after that we connect it to the Repeating Sequence Stair whoes output is defined every 10 sec.

We given thresold value is 25°C so that it don't turn on the fan. so when temp. increases it turn on.

thermistor sences the temp and give output to switch via resistor which futher sensed by voltage sensor.

switch gives output to controled voltage source which futher connected by fan(simulink-made of dc motor) output of fan is given to ideal trnslational motion sensor.

Angle vs Time graph

Angular velocity vs Time