Build a 4 digit lock control complete with telephone style keypad input and 110V relay output. You program the input code. Connection instructions for a variety of uses. Operates on 6-12V DC.
Principles taught: LSI logic, security.
Components: 2 capacitors, 2 resistors, diode, transistor, IC, relay, 24 pin header, keypad, ribbon cable, battery snap. |
