CD4013 CD4011 Multi Function Coded Lock Suite Circuit Password Lock DIY Kit Module Board SMD Resistor Keyboard Keypad Button

1.Operating Principle:press S1,U1A Q=1;press S4,U1B Q=1;press S7,U2A Q=1;press S9,U2B Q=1;when open the lock,indicator lamp LED1 will be on;and it shows input password is correct.At the same time,U2B Q=0,U3 Y=1,making the first three triggers all clear;if you want to clear U2B,indicator lamp LED1 off,you can press S8.

2.According to above analysis,the password is 1479 in turn.during the process of inputing password,if you don't press the key in the proper order or press other trigger clear port (R port) key,then the password is false.

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