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remote control using ht12e with 12 switches

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abhignans

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hello everyone
i am currently designing a remote control using ht12e
i am able to control six switches using three io pins
9879051900_1374857091.png

but i want 12 switches with 4 io pins
as i can use 4 io pins of ht12e as data pins i want 12 switches to control these 4 io pins

i cannot use any external ic or encoder for so i only have to use diodes and different combination of the diodes
please guys help me in this regards im stuck up here


here is the image of the present combination im using but i need 12 switches using 4 io pins
 

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