Carlsbad, Calif. — Linear LLC has upgraded its standalone AK series of access entry keypads by adding new programming features. The new AK-11, AK-21W and AK-31 will replace the older AK-1, AK-2W and ...

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The project shows the design of dual programmable keypad code lock that is based on a PIC16F452 microcontroller. The keypad has a cable length of up to 100m and up to two keypads can be connected to ...