This App Note describes how to implement a presence simulator controlled from the Cloud. The system consists in a combination of different internet free services as Twitter and IFTTT (www.ifttt.com). An Arduino Ethernet board is used to control a power switch to turn on and turn off a light. This design is intended to show you how the NearBus Connector simplifies the way in which these kind of Internet-based projects can be implemented.

As showed in the picture the system consists of an Internet configurable clock that sends ON / OFF messages through Twitter to the NearBus connector. The NearBus connector forwards these messages to the Arduino Ethernet board (through Internet) who Turns On and Turns Off a power switch allowing in this way to control the light sequence form any place with a simple browser.

Required Components
To implement this App Note you will need:
- 1 Arduino Ethernet Board
- 1 Power Relay (5Vdc coil - 110/220Vac 5Amp power side)
- 1 transistor BC548C (or equivalent)
- 1 Diode 1N4148 (or equivalent)
- 1 Resistor ( 2 KOhm 1/4 W)
- 1 Ethernet Internet connection (with a RJ45 cable)
- Difficulty Level: Low-Medium

Step 1: Setup a New NearBus Account

To setup a new account in the NearBus Connector, please follow the steps 1 to 6 in the Hello World example www.nearbus.net/hello_world.html. The Step 6 allows you to test the system without connecting the power circuit :)
<p>Hi, </p><p>This is so good. Can I introduce your instructable on my blog and <a href="http://wiznetmuseum.com" rel="nofollow">http://wiznetmuseum.com</a>.</p><p>Thank you in advance.</p>
<p>Hi midnightcrow, yes, it is fine for us<br>Thanks for your interest, cool blog :)</p>
<p>Thank for your sharing...</p>
<p>I tried this setup, everything seems right, but the twitter functionality seems broken, can anyone confirm this is actually working? restapi works. but not this</p>