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+Title: Remote Control Light Switch
+Date: 2014-10-09
+Category: Projects
+Summary: A device to toggle my lights remotely.
+
+I wanted the ability to toggle my bedroom light remotely for convenience. I
+designed a circuit that allows me to control my light with any
+device that can load a webpage.
+
+I still wanted to be able to control the light manually, so I bought a metallic
+face-plate and turned it into a capacitive touch sensor. The slightest touch
+anywhere on the plate is enough to toggle the light. I had to electrically
+isolate the metal screws from it because they screw into a grounded switch box.
+
+![a rusted metalic hand]({static}/images/light-switch/light1.jpg)
+
+## Function
+
+I have a Raspberry Pi ($35 computer) on my home network that runs a web server.
+When you connect to it in your web browser, a page loads with buttons to turn
+the light on or off. When you press a button, the server executes a command that
+sends a message over Bluetooth to the light switch. The Bluetooth module in the
+wall receives this message and forwards it to the microcontroller, which
+processes it and toggles the relay. The whole circuit is also powered from mains
+by an AC-DC converter.
+
+This entire process happens quicker than half a second, so it feels instant.
+
+![a rusted metalic hand]({static}/images/light-switch/light2.jpg)
+![a rusted metalic hand]({static}/images/light-switch/light3.jpg)