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Clothes are normally hung outside to dry in the sun. There are possibilities of clothes being wet
when there is a rainfall. The system as shown below is used to put clothes inside the house when
there is a rain. The rain detector sends a high signal to the pin D0 of the input port 30H whenthere is rainfall. The microprocessor then rotates the string on which the clothes are hung. The
string is rotated by sending a ‘10’ to pins D0 and D1 of the output port 40H to which a DC motor
is connected. The string is rotated until the limit switch1 sends a high signal to pin D7 of the input
port 30H. Also if the rainfall stops the cloth is send out by rotating the DC motor in the other
direction. ‘01’ is to be send to pins D0 and D1 of output port 40H for this operation. The motor is
rotated until the limit switch2 send a high signal to pin D6 of the input port 30H. Write a program
for the proper operation of the system.




soln 

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