• LPC2148 4x4 Matrix Keypad Issue
    i m a M.Sc Electronics Student and now i have been told to interface the keypad on the Dev kit the board is Called Spirit II from Oasis, it has a LPC2148. the keypad is a matrix keypad. now whats done...
  • 4x4 keypad
    Hello, i was wondering if anyone could help me, to get my 4x4 keypad scanning function working. Its supposed to drive each column to zero one at a time and then poll each row in sequence for zeros....
  • 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...
  • Interfacing with a 4x4 keypad on same bus
    Hey, i have a problem that i have been at for over a day now, and i can not solve this with my skills. So the problem is as follows. I am trying to get an output from a 4x4 keypad, which would not be...
  • Using an 8051/8052 microcontroller to decode a 4x4 matrix keypad
    I want to know how to use a lookup table to decode a 4x4 matrix keypad e.g a Grayhill 96 series keypad in 8051/52 assembly language.Please, may you send me example assembly code used in this decoding...