Step 2: Plan Your Installation and Order Your Sensors.

The Theory of Operation and Installation Manual contains all of the information that you need to plan your installation and order the sensors that you will need:


SIS uses inexpensive wireless sensors that you can purchase from E-Bay or Amazon.com for under $10 each. The sensors are battery operated and the batteries should be good for a period of 6 months to several years. The main sensor type used in SIS is the wireless PIR motion sensor (shown above). SIS also uses magnetic separation sensors on exterior doors. Additional sensor types may be used within SIS. These include Water Level Sensors, Vibration Sensors and Keyfobs.

SIS compatible sensors operate in the 315 MHz and 433 MHz RF bands (SIS supports a mix of sensors operating on both frequencies). The modulation is On/Off Keying (OOK) and the sensors transmit codes compatible with the PT2262 and EV1527 protocols. The SIS release package also contains Arduino source code that transmits data that is compatible with SIS. You can use this software to create your own, SIS compatible sensors:


<p>Well written instructions and a very nice project.</p><p>You may want to edit the final email address. It looks like &quot;shrimware&quot; should be shrimpware. Love your logo!</p>
<p>Thanks for noticing this - done!</p>
<p>I made one using 433 and 315 MHz receivers from Sparkfun. It made the assembled PCB look a little like the starship Enterprise.</p>
<p>Great ideas for a DIY security system.</p>
We have thought about using SIS for security, but we have reservations about the cheap sensors. These sensors are, in fact, sold on E-Bay as part of a security system, but they do not broadcast a low battery conditions. We think that the low price is worth it if the application is monitoring Grandma to see if she is OK at home (but not emergency response!). If a sensor battery dies, you would see a change in Grandma's daily pattern that would consistently leave out some room, in which case you would be inclined to check on the sensor's battery (and Grandma!).<br><br>Another reservation is that the separation sensors only trip when a door or window is opened. Most professional alarm systems keep track of door and window state so that you don't arm the alarm system with the back door or a window left open and then a burgler enters the house without tripping the alarm. Likewise, in SIS we cannot tell if Grandma closed (and locked) her door when she left the house, but we do know that she went out and is not at home.

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