• Key de-bouncing in 4x4 matrix keypad
    I'm using 4 x 4 keypad to send the output to 2 7-segment LED. problem: key de bouncing problem Summary problem: when I press key, it shows both digit on the left and right. For example, if I...
  • 4x4 Matrix keypad help
    Hi, i am new to ucontroller programming. I wanted to make some password and 7-segment display projects using 4x4 matrix keyboard as input, in C. I just need some simple example links or sample code...
  • Matrix Keypad for Atmel AT89C51SND1
    Hi all, I'm quite new at this, so please bare with me. I have a question regarding Atmel AT89C51SND1. For my application I need 12 different keys. As i understadn the AT89C51.. has 4 interrupt driven...
  • matrix keypad multiplex with lcd
    Hi, can anyone help me about using keil c (8052) to use P1_0 to P1_3 as row of matrix keypad pin and also 4 data pins od 16x2 lcd (i.e. P1_0 to P1_3 multiplex with matrix keypad and lcd !). using matrix...
  • Key de-bouncing in 4x4 matrix....
    hi , i am not well in english ,try to understand my language. here i am using 4x4 matrix keypad .... problem: key de bouncing problem requirement: when i press key and i hold it some time...