Security keypad with programmable PIN

This module uses an AVR microcontroller to interface a cheap numeric keypad. The PIN code is set by the user and stored in EEPROM. If entered correctly; a one second pulse is sent on either output 1 or 2, depending on the selected mode. A tamper pin will be shorted to 0V when the module is connected. This keypad module is not itself meant to control anything, but it provides trigger signals for other control modules to act upon. It has three LEDs (green, red and alarm) which can be used to convey messages from that other control module. Powered by: 5V.

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Intruder alarm system controller

I build this intruder alarm controller for my old apartment. It had two modes; away and armed. It was activated either with a key switch, or using the Security keypad with programmable PIN module. When the key switch was turned, a green and red LED started to toggle back and forth. If the key was turned back on green, the away mode would activate, if on red then the system would arm. The key switch and LEDs was mounted in status panel that I had in the apartment.

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