Composed of 0-9 with 4 × 4 number keys and confirm key. Formed with 8-bit digital tube display circuit prompts when a password, only show "8.", When finished press Enter to confirm the password digit key, enter the password on the password and compare, if the password is correct , then the door opened, light emitting diode LED used here as a prompt for a second, also issued "Ding Dong" sound If the password is not correct, against key input for 3 seconds, also issued a "tick, tick" sound alarm if in 3 seconds still pressing the button, then the ban button for 3 seconds to be re-importation ban.

4×4键盘及8位数码管显示构成的电子密码锁.doc

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