Password switch circuit with alarm function composed of CD4017 and CD4013
Source: InternetPublisher:张小哥 Keywords: Switching Circuit Updated: 2024/08/16
The password switch shown in the figure is composed of 10 keys, including 6 valid keys and 4 pseudo code keys. Since the valid keys can be reused, this circuit uses them to form a 9-digit password password switch. The circuit is equipped with a time control function. When the adjacent keys are pressed for more than 3 seconds, the valid code entered will become invalid. In addition, the circuit also has an alarm function. When the pseudo code key is pressed, the alarm circuit will be triggered to sound an alarm. The circuit composition is shown in the figure, which consists of a password input switch, a password formation and output circuit, a switch control circuit and an alarm circuit.
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