Android Wear is a pretty exciting platform. We find new, interesting apps for it every day. Sesame is quite a useful app. Developed by Dheera Venkatraman, this app lets you open your door by saying “OK Google, Open Sesame” to your Android Wear smartwatch. He used an Arduino Uno, a HC-05 Bluetooth module, and a HS-311 servo to pull this off.
You can find more information and useful code on his website.