This is the instructions and schematic for a garage door hacker. It modifies an existing door opener to run through every possible code.
The garage door hacker uses a 555 timer as a pulse generator to transmit pulses to a binary counter. Each pulse will increment the binary counter by one. You can adjust the speed of the counting by turning R1. Go ahead and experiment to find just the right speed to use. Switch one is for resetting the count back to the beginning.
As you may notice, the...