Further, for the ease of taking the PCB layout and making the PCB more compact, the circuit was decided to be split up into 3 or 4 boards ( 3 without Keypad). The PCB and its input side was kept on one board and the other components were put up on another board.
The ciruit connections are as shown. The main board is provide with 7-pin and 8-pin SIL connectors to provide connections to the next board. Three separate connections for ground and Vcc, to take connections from it, in case the further boards developed doesn't have the ground and Vcc.
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