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Single button garage door lock access

Do you think you need a keypad to enter door lock code? Well think again. This one uses only one button to enter four digit secret code combinations. The concept is being around in internet. Anyway this is a slight modification ported to AVR ATtiny13 microcontroller.

To enter code there is a simple trick – press button as many times as you need to enter a digit. Once number is entered wait for LED flash then do same for second number. If whole code is correct – garage door opens. The project is pretty straight forward – built on protoboard but it seems to working fine. Sometimes it is enough to trick strangers.

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