SmartCard4eng.pdf

E lectronic L ock with AVR

ELECTRONIC LOCK S mart C ard 4

1 SUMMARY

The electronic lock S mart C ard 4 is easy to make and set up, it is

small and easy to use. An additional advantage to its safety is the

fact that a connector of chip cards is set up on the external part of

the door or the garage door, whereas the electronics is set up on

the internal part. In this way a physical access to the electronics

is not possible. Similar products of other well-known companies

have the electronics and the connector of chip cards set up on the

external part of the door. In this case the safety is ensured only if

a reader of chip cards is connected to a house alarm device,

which is then connected with the appropriate security company.

Key words: chip, smart card, microprocessor, micro-controller, code lock, door, atmel, avr,

laser, welding, welding pattern, polishing, electrodes, acid, polishing panels.

FUNCTION

The door is unlocked in a way to enter a chip card. A micro-controller (Atmel AVR) checks a

serial number of the chip card, which is different for every chip card produced. You can write

the number of one, two, three or four chip cards into the memory of the micro-controller, in

its last version there can even be 15 chip cards written down. If the number of the chip card is

the same as the serial number written down in the memory of the micro-controller, the

electronic lock beeps twice. When you draw the card out, the door unlocks after a second and

stay unlocked for two seconds. During this time you can open the door. If the serial card

number does not match any of the four serial numbers written in the memory of the micro-

controller, you van hear several short beeps. The entered serial numbers of the chip cards are

permanently saved in the micro-controller and remain written down even if the micro-

controller is without loading voltage. In case when the serial number of the inserted chip card

is not correct, which means that it is not written down in the memory of the micro-controller,

there are ten short beeps heard.

3 PROGRAMME

The programme for SmartCard4 is written down in a programme language Bascom-AVR.

The serial number of the chip card can be either checked through a written record in the

micro-controller’s eeprom or it is being written down in the micro-controller’s eeprom. You

can determine the function which will be carried out with a jumper STO (STORE). The

entered jumper determines storing of a serial number of the chip card, but if the jumper is

drawn out it checks the serial number of the chip card. In case the serial number of the card is

correct there are two beeps heard, then the micro-controller waits for the card to be drawn out.

When the card is drawn out, the micro-controller waits for a second and then activates a relay

for unlocking the door for two seconds. The two beeps also confirm the correct entering of the

serial number of the chip card. In case there is a chip card with a wrong serial number entered,

you hear ten short beeps.

e-mail: rudi.slejkovec@siol.net

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E lectronic L ock with AVR

4 MAKING A PRINTED CIRCUIT

There is a one-sided printed circuit. The order of soldering goes from the lowest to the highest

element according to the height of these elements. First we connect a loading voltage to the

electronics without a micro-controller. To check the function of the electronics you can use a

12V one-way voltage from a rectifier or an adapter instead of a toroidal transformer, or you

can even use the voltage of two 9V batteries, which are linked successively. If everything is in

order you can disconnect the loading voltage and only then you can insert the micro-controller

IC1 into a base. Now you connect a connector of the chip card and the loading voltage. You

insert the chip card which is turned the other way around. The relay must draw it since the

micro-controller’s memory is empty. The connector of the chip cards, to which we have

added a metal front panel with a gap, is set up on the outside part of the door, whereas the

electronics is set up on the inside part. The connector of the chip cards is connected to the

electronics with 8 or 10 core telephone conductor, which depends on the position of a beeper

(or an additional LED diode) that can be put on a casing or on a keyboard. Then you run a

little channel from the electronics casing to the nearest voltage source of 230V and to the door

strike (electric lock).

5 MAKING A FRONT PANEL

The front panel is made of a 2mm inox thin plate. It is cut by a laser because of the narrow

gap in the front panel. A holder of the electronics, which is set up on the outside part of the

door, is welded on the panel. The front panel and the holder of the electronics are welded

under the 90-degree angle. You should use special welding electrodes. You weld with a help

of a welding pattern on which the front panel and the holder of the electronics are fixed. After

the welding you coat the front panel with acid and wait for 20 minutes. Then you polish the

front panel on the polishing machine. With a help of the acid and polishing you remove oxide

from the front panel, which resulted of the welding.

Technical data:

Operating voltage: 10-18V of direct-current voltage or 8-13V of alternating voltage

Current consumption: stand-by position = 4mA, relay switched on = 25mA.

A relay single-pole changeover switching contacts 2A/48V DC

The four user combinations codes. Each code is 32 bytes long.

The time of switching on the relay is 2 seconds.

INSIDE

Door

frame

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E lectronic L ock with AVR

A list of used elements

Piece Typ

Value

Reference

Resistor

R1, R10

1 kΩ

Resistor

R2, R8

22 kΩ

Resistor

R3, R9, R11

4,7 KΩ

Resistor

R4, R5, R6

10 kΩ

Resistor

3,3 kΩ

El.capacitor

220 uF / 35 V

El.capacitor

22 uF / 35 V

Capacitor

33 pF

C4, C5

Capacitor

100 nF ML

C2, C6, C7, Cx

Transistor NPN

BC 547 C

T1, T2

Transistor PNP

BC 557 C

Diode

1N 4007

D2, D6, D7

LED diode, red

3 mm

Diode

1N 4148

Greatz

B80C1500

BR1, BR2

Micro controller

AT90S2313

IC1

IC socket

20 PIN

IC1

78L05

IC2

Fuse

100 mA

Fuse socket

Isolated!

Quartz

4 MHz

Relay

12 V DC

RE1

Transformer,

toroidal, 20VA

230 V / 12V / 20VA

Beeper

SEP 2240

Pcb terminal block

Pitch 5,08 mm

J1 to J14, 1 to 6, P and M

Jumper

Pitch 5,08 mm

For: STO, C12, C34

Pcb terminal spikes

Pitch 5,08 mm

Jumper: STO, C12, C34

ISO Smartcard

connector

ISO Smartcard

connector

Conrad

Nr: 730521

Housing

(87 x 127 x 60) mm

Front plate

(32 x 120 x 2) mm

Inox 18/10

PCB

Pcb1, Pcb2

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Door strike, voltage

(8 do 12)V

NUOVA-FEB, ISEO

or sim.

Door strike or electric lock

A picture of the printed circuit

e-mail: rudi.slejkovec@siol.net

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E lectronic L ock with AVR

An electric outline

An assembly outline

A picture of the front panel and the electronics holder

Z oranžno

e-mail: rudi.slejkovec@siol.net

http://www.avr.4mg.com

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