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I/O breakout to 8 security sensors
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Security Sensor Breakout

Copyright 2017-2019 SuperHouse Automation Pty Ltd:

Based on the circuit described in the "Security / Automation Sensors" project in the book "Practical Arduino", this breakout allows up to 8 security sensors to be connected with full End-Of-Line (EOL) support to detect tampering.

PCB render

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 I/O breakouts such as the I/O Breakout and I/O Breakout Mega, both from SuperHouse.


  • Supports 8 sensor channels simultaneously.
  • Sensor power supply connections.
  • "Sensor power on" LED.
  • Optional status LEDs for each channel

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 the project.


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.

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