cdedwards / securitysensorshield

Arduino shield for connecting security sensors with full end-of-line support

Security Sensor Shield for Arduino

Copyright 2010 Freetronics Pty Ltd
Freetronics site: <www.freetronics.com>
Freetronics email: [email protected]

Based on the circuit described in the "Security / Automation Sensors" project in the book "Practical Arduino", this shield allows up to 4 security sensors to be connected with full End-Of-Line (EOL) support to detect tampering.

Supported sensors include:

• PIR (passive infrared) motion detectors.
• Microwave motion detectors.
• Reed switches.
• Glass break detectors.
• Gas detectors.

End-Of-Line technology allows the system to detect a variety of events using a single cable pair to the sensor, including:

• Sensor triggered.
• Sensor cable cut.
• Sensor cable short-circuited.
• Sensor housing opened (even when system is disarmed)

Compatible with the Freetronics TwentyTen, Arduino Uno, Arduino Duemilanove, and other compatible boards based on the same header format.

Features:

• Supports 4 sensor channels simultaneously.
• Sensor power supply connections totally isolated from the Arduino.
• Status LED for each sensor channel.
• Reset button wired through to Arduino reset pin.
• Green "Sensor power on" LED with current-limiting resistor.
• Blue "Arduino power on" LED with current-limiting resistor.
• 100nF bypass/smoothing capacitor on supply rails.
• Overlay guide where you need it: both top and bottom.

More information is available at:

http://www.freetronics.com/security-sensor-shield
http://www.practicalarduino.com/projects/security-sensors

The "docs" folder within this repository includes a handy copy of the schematic in PDF format and image(s) of the pcb.

INSTALLATION

The design is saved as an EAGLE project. EAGLE PCB design software is available from www.cadsoftusa.com free for non-commercial use. To use this project download it and place the directory containing these files into the "eagle" directory on your computer. Then open EAGLE and navigate to Projects -> eagle -> SecuritySensorShield.

DISTRIBUTION

The specific terms of distribution of this project are governed by the license referenced below.

LICENSE

Licensed under the TAPR Open Hardware License (www.tapr.org/OHL). The "license" folder within this repository also contains a copy of this license in plain text format.