An automatic control circuit sell stamps. With two light-emitting diodes were simulated sold hexagonal and octagonal face value of the stamps, the purchaser can select a switch with a face value of stamps, stamp lights that were sold. Analog switch, respectively, of the iceberg, the Pentagon and one-dollar coins into. Representing the light-emitting diodes used to find the remaining coins. Requirements: only the sale of each stamp cast coins when reached or exceeded the face value of the selected buyer, the sale of a stamp and get the remaining coins back to the initial state when the vote with a face value of coins worth less than when can be reset through a vote by coin return button to return to the initial state.

stamp_seller.v

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