12C508 Smart Lock: The base sends a data sequence (the
password) which is recognized by the key. The key checks the
sequence and -if it recognizes it -sends to the base another
data sequence, as an answer to the password. At the Time when
the base gets a correct answer (which means that the key has
been introduced), the relay is put into action, and it can
command a number of consumers.
Combination Lock: This circuit is very basic to build. To
open a the lock which is connected to the K1 Load. you must
press each momentary switch in the correct sequence. The
sequence used in this circuit is S1,S2,S3,S4. If any of the
other switches are pressed the circuit will reset and you will
need to start over. Depending on how you wire the switches, you
can use any4 switch combination
Simple Electronic Lock Uses Single Transistor Circuit:
05/26/03 Electronic Design - Ideas for Design / Building
on the recent Design Brief theme of one-pin keypads, this design
uses only one analog microcontroller (MCU) input to scan
numerous keys, plus one resistor per key and another resistor
and capacitor. The circuit is simply a crude...