Security Sensor Shield for Arduino
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Security Sensor Shield for Arduino

Copyright 2013 Freetronics Pty Ltd
Freetronics site:
Freetronics email:

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 Eleven, Arduino Uno, and other compatible boards based on the same header format.


  • 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.
  • Blue "Arduino power on" LED.
  • Overlay guide where you need it: both top and bottom.

More information is available at:


The design is saved as an EAGLE project. EAGLE PCB design software is available from 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 -> SECSENSE.


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


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