Details

HomeAlarmPlus Pi

https://homealarmpluspi.blogspot.com/2013/04/blog-post.html

Home Alarm System using Raspberry Pi, Netduino Plus and ATtiny85 (HomeAlarmPlusPi project)

Latest update: Friday, November 8, 2013

This is an open source home alarm monitoring system using Raspberry Pi, Netduino Plus, ATtiny 85 and a typical home alarm system. This implementation could be used in conjunction with the PC5010 Digital Security Controls (DSC) PowerSeries Security System control panel and sensors. Tested with Netduino Plus 1 running .NET Micro Framework 4.2 (QFE1 or QFE2) and Raspberry Pi Model A running Debian GNU/Linux 7.0 (wheezy).

Previous Implementation
When I first started HomeAlarmPlus on February 2012 my intent was to have a simple home alarm monitoring system and learn more about microcontrollers. As the knowledge kept growing, also the complexity of the circuitry, system and requirements. Then Raspberry Pi complemented the existing project by using full capability of Apache Web server. This involved massive code changes to the original project reflected in HomeAlarmPlusPi.

Objective
Use full capabilities of Raspberry Pi and Netduino Plus to monitor home alarm system and report any sensor/motion detector activities via email (using Simple Mail Transfer Protocol (SMTP)), local web server, notifications (using PushingBox) and Pachube (now Cosm).

Programming Languages and Web Development

On Netduino Plus

C# for Netduino Plus
HTML for Web Server with Cascading Style Sheets (CSS)
JavaScript for Web Server

On Raspberry Pi

HTML5
PHP
Java Script
JSON
jQuery
Weather Underground API
Python (under development: use of GPIO)

On ATtiny85

C/C++ to program the ATTiny85. Built an ArduinoISP shield following the MIT High-Low Tech Group.

Warning
This code contains information related to a typical home alarm systems. Please, be aware that this procedure may void any warranty. Any alarm system of any type may be compromised deliberately or may fail to operate as expected for a variety of reasons.

The author, Gilberto García, is not liable for any System Failures such as: inadequate installation, criminal knowledge, access by intruders, power failure, failure of replaceable batteries, compromise of Radio Frequency (Wireless) devices, system users, smoke detectors, motion detectors, warning devices (sirens, bells, horns), telephone lines, insufficient time, component failure, inadequate testing, security and insurance (property or life insurance).

One last thing:
DISCONNECT AC POWER AND TELEPHONE LINES PRIOR TO DOING ANYTHING.

Required Hardware

Raspberry Pi Model A or B
Netduino Plus
ATtiny85 (ATTINY85-20PU).
SD Memory Card 4 GB or above (Class 10 preferred).
5V 1A (1000mA) USB port power supply.
Micro SD Card 2 GB
WiFi(802.11b/g/n) USB Module [1], [2] or [3]
SD Card Adapter
3mm green Light Emitting Diode(LED) per alarm zone and motion detector.
330 ohm for each LED.
NPN Transistor
10k ohm variable resistor
1k ohm resistor for transistor's base.
5600 ohm resistor per alarm zone and motion detector.
Schottky diode per alarm zone. Schottky diode should have low forward voltage drop like the SBR10U40CT.
ScrewShield (Proto-Screwshield (Wingshield) kit from [1] or [2]).
WiFi connection using any WiFi Internet Adapter. Tested on Netgear WNCE3001 and IOGEAR GWU627.
Basic 16x2 Character LCD [1] or others [2].
DPDT switch [1] or others [2] for LCD voltage selection.
74HC595 Shift Register

Optional Hardware

Panel Mount LED (Green LED with Holder)
Mini Buzzer (3VDC)

USB Ruggedized / Waterproof Panel Connector (RR-211300-30)

RF Receiver Toggle Type to arm/disarm [1].
USB 2.0 Cable, Type A Male to A Male (10 Feet or above). Used to access the Netduino Plusboard on the alarm panel.
200 Watts / 350 VA UPS (APC BE350G UPS System or similar).
Push button for external reset.
Arduino Proto Shield R3. More space for additional components.[1] or others [2], [3].
Low-profile microSD card adapter for Raspberry Pi [1].
Raspberry Pi case [1] or others [2]
In-line power switch for 2.1mm barrel jack [1] or [2].
Raspberry Pi heat sink set [1].
12 VDC Micro fan to cool down Raspberry Pi [1].

Settings
For HomeAlarmPlus and HomeAlarmPlus Pi the conditional symbol ALARM_DEBUG enables alarm debug on Visual Studio. To enable debugging on Visual Studio just right click AlarmByZones project, select properties, select Build tab and add ALARM_DEBUG under "Conditional compilation symbols".

More debugging capabilities will be implemented for Raspberry Pi and ATtiny85.

Circuitry
The following Fritzing diagram shows how the Netduino plus, LEDs and the alarm zones (or motion detector) are wired. Compared from previous implementation(HomeAlarmPlus) I added ATtiny85 in order to reduce threads in the Netduino Plus 1. By doing this I saved 2 KB of RAM and have more code space.

Keep in mind that one or more zone consist of the following:
a) 1 Normally Open contact and 1 Normally closed contact with End Of Line (EOL) resistor.
b) Double EOL circuit, 1 Normally closed contact with 5.6kohm EOL resistor and Schottky diode. This will bring the protection needed for the Netduino or Arduino.
c) Each ground zone should be connected to the ProtoScrewShield GND.

Web server options on Netduino Plus

Web server options on Raspberry Pi

Software Architecture

Final Product

Under Development

Web interface for tablet based devices. [Testing, not released]
Cameras with integrated motion sensor and night vision. Camera should be integrated with Raspberry Pi GPIO.
More debugging capabilities for Raspberry Pi and ATtiny85.
Explore additional notification options like IFTTT. [Done. Released July 17, 2013]

References

Simple Mail Transfer Protocol (SMTP) based on BanskySPOTMail by: Pavel Bánský.
Netduino Web Server based on MFToolkit library by: Michael Schwarz.
Pachube Embeddable Graph Generator (Beta) by: Cosm (formerly Pachube), adapted by Gilberto García.
Extensions class based on a post/implementation by: Valkyrie-MT, expanded by Gilberto García.
StopWatch class based on a post/implementation by: Chris Walker.
LCD display using uLiquidCrystal library.
TimeSpan reference [1].
Raspberry Pi basic setup.
Raspberry Pi initial setup.
Setting up a VNC server on Raspberry Pi.
How to setup a Raspberry Pi Windows NAS storage and web server [1], [2]and [3].
ATtiny85 PWM tutorial.
Wunderground API.
Wunderground weather forecast Stack overflow solution.
JSON, jQuery and jQuery Mobile tools and tutorials [1], [2] and [3].
Mobile browser detection [1] and [2].
PushingBox notifications.
PHP DateTimeZone [1].