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Continuing the series of articles on how easy it is to assemble automation devices on the Tibbo Project System , we decided to verbalise about creating an access control system. There are many devices in this market section: from inexpensive and simple controllers to distributed flexible systems with a tangled structure and high price. We will try on to create our own comprehensive controller with the alkaline ACS functionality. At the same time, given the flexibility of our hardware platform, you seat assemble your own configurations of such devices for personal or commercial purposes, winning Eastern Samoa our basis our adaptation, the verbal description of which is low the cut.

Access control condition is a key element in a multiplex of security systems. Installation of the system allows you to organize authorized get at to covert objects, thereby ensuring the safety of material assets, surety, control over the situation, access code to paid objects and services. We put across ourselves the task of creating a universal access controller based on the Tibbo Project System platform . The platform already has Ethernet along card, computer memory, ex gratia Wi-Fi, connectors for installing I / O modules. The presence of a universal type allows you to create all over products, rather than semi-finished products on the board. A full description of the platform is available in our critique . But first, you need to understand what types of accession operate systems are divided?

Local or network access control system of rules?

ACS systems are segmented into two categories: autonomous and network. The first type does non require centralized direction. Access authority is carried out either due to the local database, operating theater due to outward information from the identifier. Autonomous systems are suitable for micro objects: offices of small companies, offices, vehicles, access to paid services in entertainment centers. Network ACSs have centralized management, which allows you to quickly respond to the situation, integrate data into early systems, creating a single information space of the object. The principal differences between a network controller and a standalone one are: the presence of a network interface and a protocol for exchanging information with a central host. This type of organisation is suitable for installation on outsized objects, such as business centers, large companies with more memory access points,

Requirement for universal controller No. 1: the ability to oeuvre in stand-alone and network mode.

To implement this requirement, we chose the TPP3 calling card as the basis for the future device , on which the Ethernet user interface (nonobligatory WI-Fi) is already implemented for communication with the primal server. The presence of memory allows you to maintain a local database of capable 2,000 users and read an event log (skyward to 20,000 entries). We decided to realize the comptroller at cardinal points of passage. If essential, the system can easily constitute ported to a smaller TPP2 display panel to assure one memory access point or two points, but with a limited connection of external sensors.

Identity operator Twist Connections

In general, the tasks of the ACS controller are simple: substance abuser identification on the footing of the "have" / "foreign" principle, interrogation of sensors for unauthorized entry, direction of the entrance radical, alarm direction.

By the character of user designation, ACS systems take different requirements. To access the premises with an ATM, bank wit readers are used. Business centers typically use RFID engineering science, magnetic stripe cards, badges with bar codes, and iButton keys. For stricter control, biometric readers are used. It is too possible to straight off enter the access from the keyboard. There are objects where multilevel authorization is compulsory, then a combination of different identification methods is applied.

Requirement for universal controller No. 2: the ability to connect various identification devices.

We detected that most outside readers are connected via RS232. Therefore, the first to follow considered was the input / output mental faculty (Tibbit) # 01. The functionality of the module is uncomplicated - the transceiver / transmitter chip converts the UART levels to the RS232 specification. What we need. We install Little Jo such modules on platforms S1, S5, S9 and S13: for conjunctive readers to the entree and exit to 2 access points. For ease of installation, concluding and DB9 connectors are provided. We have selected the first option.

For identification devices that use disparate interfaces, we just change the corresponding tibbits: for Wiegand, Time / data - # 08, for RS485 - # 05. It is also possible to connect devices using the 1-Wire protocol using the PIC coprocessor to canvass this bus (Tibbit # 31).

Entrance Group and Sensors

Entrance group ascendence (barriers, turnstiles, magnetic attraction or electromechanical locks), also as alarm control, is usually implemented victimisation a relay that closes the outside circuit of the actuators.

Demand for the universal control Nobelium. 3: the mien of normally open relays for controlling actuators.

For the basic variation of the controller, we decided to use Tibbit # 03-2 with cardinal relay race switching the current up to 1A (as can be seen from the module diagram, one relay has usually open and normally closed outputs, the second relay has only Atomic number 102 contacts). 1 relay is utilised to control the stimulation group, the arcsecond for signal. We set up the selected Tibbits connected the S11 and S15 platforms, use of goods and services the already installed terminals equally a connector. If you want to switch more than current, you can select other tibbits. For exercise, module # 06 is designed for currents up to 16A.

Sensors of the "dry contact" type, motion sensors, windowpane breaks, mass sensors, etc. are wont to varan unofficial access. Typically, so much sensors have a digital output.

Requirement for worldwide accountant No. 4: The presence of separate inputs for monitoring extraneous sensors and connecting the room access open button.

Tibbits of point-blank input / output are usually accustomed plug in sensors. We instal Tibbits 001 on the S3 and S7 platforms. To each one Tibbit has 4 direct entry lines. This option is desirable for us, although you crapper choose other options: opto-quarantined inputs, inputs with a common "+", etc.

The board is ready. S17-S23 platforms remained for the modesty for a possible expansion of functionality. In our version of the controller, we additionally installed a Badger State-Fi module thusly as not to pull the cable to the installation site. IT remains to install the vibration protective covering plateful for reliability and identify the assembly in a universal lawsuit. The presence of a top with the possibility of sign language pins will help future adjusters not to get disorganised in the pins of the control.

For scheduling, it is enough to supply power to the board and touch base it to our local anesthetic network.

Firmware

The firmware logic is trivial, so it makes no sense to publish the source code. Just I would like to draw attention to any nuances.
The first thing to note is that we create a universal comptroller with the power to quickly change functionality. Therefore, the program code tied to a specific tibbit is moved to separate libraries. This allows you to make over your ain comptroller configurations on the fly: increasing entree points, connecting additional sensors, changing the type of identification readers - you do not have to rescript anything in the cipher, replacement a pair of constants and the new interpretation of the comptroller is ready.
In addition to the hardware characteristics, the restrainer must besides identify the functionality: store of the event log, data exchange with the waiter, security mode, remote configuration, substantiate for modern data substitution protocols, etc. All this is besides enforced in the elemental firmware.

The source code is open and free.

Software

At the moment, on that point are two options for the electronic network mathematical process mode of the controller. The first united is based connected conjunctive to an external MySql database . Upon identification, the controller makes a request to the host and, if the code is found in the database, opens access to the targe.
The second, more interlacing - the controller is controlled through the AggreGate platform . This allows you to remotely configure the accountant, produce compound, branched access mastery schemes, offer various types of reports, etc.
Open source and the ability to freely plan allow you to join the control to about whatever access control system.

The result is an access controller with the following characteristics:

• management of two zones of passage;
• Ethernet, WiFi interfaces;
• connection of improving to 4 external readers via RS232, RS485, Wiegand, Clock / data, 1-Wire, WiFi interfaces;
• 4 relays, if necessary expandability to 10 relays;
• 4 dry contacts expandible;
• well-stacked-in sound indicator and LEDs for monitoring the status of the controller;
• adjustment of time of maiden of the put away;
• embedded RTC. Calendar support;
• backing for up to 8 individual admittance schedules with the possibility of increasing this number;
• card validity support;
• re-unveiling or exit control (antipassback);
• control prohibition of entry without a loss leader;
• code under duress;
• remote warning device notification (potentially via SMS or email);
• the ability to configure the discipline of transition;
• the ability to change the hardware form to the local requirements of the jut out;
• open informant write in code that allows you to qualify the firmware for unequaled tasks.

Golf links:
Product page on our site.
Accounting for working hours on TPS .
Overview of the Tibbo Project System .
Indoor Weather Station

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