Step 1: Purchase the Lock and Unpack It
Remove it from the box and take a look at what's there. The construction of the lock is really great. Anywhere that could even remotely see any moisture is surrounded with rubber sleeving or a rubber o-ring. The lock has 3 basic parts:
outside portion: This portion has a regular key cylinder, a knob for the deadbolt similar to what you normally see inside of a house, and a keypad for entering the code.
inside portion: This portion has a knob to operate the deadbolt, a housing for a 9v battery, and a switch to tell the electronics in the front of the lock when the lock is in use.
deadbolt mechanism: This portion is similar to any other deadbolt on the market.
Step 2: Take the Faceplate Off of the Lock
Step 3: Take the Intermediary Plate Off
remove 2 T10 Torx screws seen in the second picture and you'll have something like what's in the third and forth pictures.
Step 4: Check Out All of the Neat Stuff
If you weren't careful, the long thin part that goes through the middle portion likely pushed its way out a bit and an almost invisible spring went shooting somewhere. Go find it. We'll call this assembly the working portion. Picture 2 displays how it goes together.
On the right you'll see a piece of plastic that resembles a backwards C. This piece of plastic uses a post on its backside between two coils of a spring attached to a motor. When it moves up, it pushes the mushroom shaped part of the working portion upwards causing the "stem" of the mushroom to stick out into some of the fingers of the star shaped piece on the rear of the intermediary plate. This allows the knob on the front of the lock to turn the working portion and operate the deadbolt.
It's pretty simple but very effective. Motor spins in one direction, plastic goes up and the lock works. Motor spins in the opposite direction, plastic goes down, lock freewheels.
In the next step, I'll show how to attach some wires to the motor so you can control them.
Step 5: Wire It Up!
Carefully route these two wires around the Schlage circuit board and push them through the rubber sleeve so you'll have access to them once the lock is reassembled.
Step 6: Reassemble the Lock
You should be able to use a 9v battery to control the lock's function.
Step 7: Create H Bridge Circuit
You should now be able to pick any two digital outs on the arduino. Setting one low and one high will operate the lock's motor in one direction and obviously if you do the opposite, the motor will operate in the opposite direction.
I added a Parallax RFID reader and I can use the Schlage's keypad or an RFID card to open the lock.
I also am developing a new security product, Tactcess, that I've interfaced with the arduino.
Read more here: http://www.cribbstechnologies.com