Knock. Knock. Oh man, you're locked out again, aren't you? Getting locked out has happened to the best of us. If for some reason that doesn't apply to you, we salute you. Otherwise, this hack is here for you!
How it works!
The peep hole in the door is replaced by a camera that's activated when someone rings the bell. The camera captures an image of the person at the door and sends it as an SMS using Twilio to the user indicating someone's visiting them. The user (house owner) in turn can choose to open the door remotely by sending back 'open' to our Twilio number which talks to a stepper motor wired to the doorknob. And voila, your family and friends are no longer locked out, wherever you are.