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a biggener needs help with encoders

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NoHa111

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hi all,
i need a 16 to 4 line encoder in my project
and i can't find an IC for that
plz can anybody tell me if it is available or not?and tell me plz the part no.
anyway,i try 2 make a simple calculator using pic16F627 and for the numbres from 0-9 and the operations(+,-,*,/) i wanna them to be on PORTB(RB4:RB7) to use the interrupt on "port change" feature...so how can i use these pins on these 4 pins???unless an encoder is used
plz help
thx all
 

for 16 keys u can make a keypad matrix 4*4 then by a single port (4 row + 4 col = 8 pins) u can take input

as u said u want to use only 4 pins because u want to use the port change interrupt, the value can be updated without using interrupt, if u r using a matrix u can scan rows / colomns in high speed and can update value,

but if u still want to use encoder u can cascade two 74148

regards
 

Take a look at 74C922 IC ( **broken link removed** ).
It is 16-key encoder ..
Regards,
IanP
 

hello
y r u going for the complexity
just use 4X3 keypad having 4 rows n 3 colomns and program it matrix wise when ever whatever key is presed it scans the key and give the output
and use AND OR function for the caucultor
or else use 2 40147
regards
haider :)
 

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