BCD input to 3-7 segment display help

Discussion in 'The Projects Forum' started by remy1987, Mar 1, 2013.

  1. remy1987

    Thread Starter New Member

    Mar 1, 2013
    I have I.D. boxes at work that identify stamping dies with a number from 1 to 255. I want to make a tester that can plug into the box and give me a readout of the 3 digit code for that box. Right now each box is normally read by the PLC. The pin out is as follows. Pin A=24 vdc, B=1, C-2, D=4, E=8, F=16, G=32, H=64,and I=128. Pin A is always jumped to the proper pins for the corresponding die number. I need the tester to add the values of each pin and display them on the 3 digit display. The plug will not have power on it so it does not have to be 24 vdc. I have some experience with electronics but not enough knowledge about specific hardware needed for this project. Any suggestions would be very helpful.
  2. MrChips


    Oct 2, 2009
    This is not easy to do with regular logic ICs.
    This calls for a microcontroller (mcu). How comfortable are you with mcu chips?
  3. takao21203

    AAC Fanatic!

    Apr 28, 2012
    Use a large EPROM if you have one available.

    3 digits (8 bit each) - 12 bit

    12 bit - 2 EPROMS in parallel

    1000 entries.

    You need 2x2716 EPROMs.
  4. crutschow


    Mar 14, 2008
    Here's a discussion of binary to BCD (decimal) conversion that may be of help.