Week -2

1. Simulink model of Doorbell using solenoid block

in this model when circuit close by pressing of switch at door electric current passes throgh curcuit.this electric current produces electro magnetic field (A solenoid is just an electromagnet where the coiled wire surrounds a metal piston. The piston contains magnetically conductive metal, so it can be moved backward or forward by the electromagnetic field).

when the presence of electromagnet in the circuit piston move inward to coil when electromagnetic field is not there piston move outward.this in and out movement of piston will produce a sound of ding and dong

in this model we make delay of 2sec to operate switch(means hold switch by 2sec) then observe the variation in output graph

the output graph and module is attached below

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

thermal resistor is defined as a type of resistor whose electrical resistance varies with changes in temperature. Although all resistor's resistance will fluctuate slightly with temperature, a thermistor is particularly sensitive to temperature changes.

here thermister is used to control the fan depending upon the variation in temperature. the input signal and module is attached below