Secret Knock Detecting Door Lock

Step 9 Mounting, Testing, and Use

First lets make sure our legs are the right length.  Be sure the lock clamp is attached to your motor and the legs are in place.  Attempt to fasten it to the door so the clamp fits over your lock.  If you're lucky the legs will be the right length and you're ready to go!  If you're unlucky the legs are too short and you'll have to cut new ones.  But chances are your legs will be too long.  Either grind/file/sand/cut them to the right length so the clamp fits right over the deadbolt lock handle.

You don't have to use suction cups and in fact may doors are immune to their sucking.  Two other options are to put PVC end caps on the legs and then secure them to the door with double sided foam tape (like this) or with screws through the caps, if you don't mind putting holes in your door.

Now that's its on you can give it a test.  Do the first test from the inside.  Lock your door and power it up.  When the green light is on give it the old Shave and a Haircut and it should unlock!

Now program in a less obvious knock (or not)  and your tree house will finally be safe from that smelly kid!

If the motor doesn't turn far enough to unlock your door you'll need to update the sketch to run the motor longer. (See Step 2!)

For additional Troubleshooting: See the bottom of Step 2.  It also includes a bunch of other tweaks that might help you.