4 pin 4 x 4 keypad interface using pic basic pro
hello. i am currently working in my institutional project..it is a digital electronic lock, using an lcd and a 4 x 4 keypad. i'm having problem maximizing the pins of my PIC16f628a. A conventional 4 x 4 keypad uses 8 pins of the pic microcontroller. is there anybody has an idea on how to convert an 8 pin keypad interface to 4 pin keypad interface? hope someone can solve my problem..thank you ver much!!!
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You could use an 8 bit parallel in serial out shift register or maybe get some ideas here
http://www.picbasic.co.uk/forum/showthread.php?t=3250
http://www.picbasic.co.uk/forum/showthread.php?t=10110
Dave
Always wear safety glasses while programming.
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You could use analog solution, different value resistors for each coloum.Originally Posted by dunlao_john
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