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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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