• This number guessing game is quite simple. In this game the player thinks of any number between 1 and 99Then he scans the eight groups of numbers given in the eight boxes.
  • Each group corresponds to a specific switch (indicated on the top of each group) on an 8-way DIP switch. The person scans the numbers in each box and slides the switch corresponding to a box to ‘on’ position if he finds his number in that box.
  • After having scanned all the eight boxes and switching on the relevant DIP switches, he is required to press switch S9 and the number thought of by the person is displayed on the 7-segment displays. After this, all switches on the 8-way DIP switch need to be turned off .


  • The circuit comprises two BCD to- 7-segment decoder/driver CD4511 ICs (IC1 and IC2). IC1 generates the number for tens position and IC2 generates the number for units position.
  • Input pins 7, 1, 2, and 6 of both the ICs are connected to ground through 1-kilo-ohm resistors. The common cathode terminals of both the displays are connected to push-to-on switch S9.
  • Suppose you want to display 47. For
    this, 4 is to be displayed in tens position
    and 7 in units position. In order to generate
    4 (binary 100) on the display (DIS1),
    switch S2 is to be turned on. To display 7
    (binary 111) on the display (DIS2),
    switches S6, S7, and S8 are to be turned
    on. Thus to generate 47, switches S2, S6,
    S7, and S8 are to be turned on.
  • In order to make the circuit compact, a DIP switch has been used here. As it may be difficult to turn the small switches on and off, you may use SPDT toggle switches in place of the DIP switch.


  1. i need pdf & ppt on the relevant topic,,, pls mail me on pls rply as early as possible...


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