Avt 5466 User manual

Basic operating state of the unit is sleep. In this

state, it will not respond to any events, its outputs

are off, and the circuit activity is indicated by LEDs,

green or orange, but only if any of the trigger lines

are not closed. If the voltage of the backup battery

drops below 10.5 V, the orange LED will additionally

flash.

The LED states with their corresponding device

states are shown in Figure 1. The unit is activated

when its input is shorted to earth. Red LED will then

flash, and the buzzer will beep periodically to

indicate the time at which you should leave the

protected area. After 30 seconds the unit will stand

by, and before the trigger line circuits must be

closed, the green and orange LEDs off. Otherwise,

the alarm procedure will start immediately. In the

active state, a green LED is on every few seconds. If

the alarm is reported via a delayed line, the unit can

be deactivated within 30 seconds; if an immediate

line is used, the sound alarm and relay will be

activated immediately. The alarm condition is

indicated by the continuous light of the red diode

and the diode corresponding to the active trigger

line.

The alarm siren will be switched off automatically

after 1 minute, irrespective of the status of the

triggering lines, another line violation will repeat

the procedure. The relay output will be on for 1

An uncomplicated alarm unit with monitoring lines:

immediate and delayed. Several sensors can be

connected in series to each of them, such as motion

detectors, window and door opening sensors (e.g.,

reed switches), optical barriers and others with output

in the form of normally closed (NC) contacts.

This unit is ideal for basic security in a house, flat or

leisure cabin.

Features

• relay output with load capacity 230 VAC / 8 A

• siren power output 12 VDC / 3 A

• 2 trigger lines: immediate and delayed with a delay

time of 30 seconds

• operating status indication: 3 LEDs

• low battery voltage indication

• power supply 8-15 VDC, current consumption: 2 mA

at stand-by, 100 mA at alarm

Circuit description

Alarm Unit with 2 Monitoring Lines

AVT 5466

kits

ASSEMBLY DIFFICULTY

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minute and then for as long as any of the trigger

lines are violated. The unit can be deactivated at

any time by short-circuiting the deactivation input

to GND. Circuit requires a power supply in the

range 8-15 VDC. Optionally, a rechargeable battery

can also be included to act as a source of

emergency power supply.

Schematic diagram of the unit is shown in Figure 2.

Operation of the device is controlled by a program

contained in the ATtiny2313 microcontroller's

memory. It is supplied by an energy-efficient

stabiliser LM2940. The trigger lines and the

activation and deactivation input are protected

against faults, with a set of RC elements and Zener

diodes. Resistors R16 and R17 form a divider to

measure the voltage of the battery supplying

emergency power, and resistor R20 determines the

charging current. Arrangement of connectors and

descriptions of their function are shown in Figure 3.

Fig. 1 LED indication of device statuses

Fig. 2 Schematic diagram of the alarm unit

Unit active Immediate line

is not violated

Unit active +

low battery

Delayed line is

violated + countdown

Immediate line is

violated + countdown

Immediate line

is violated

Alarm on

Low bat.

Immediate line

is not violated

Mounting and start-up

Mounting diagram of the unit is shown in Fig. 4.

The circuit is made of typically assembled through-

hole components, so even less experienced users

will succeed in making it. Once assembled, the unit

must be connected as shown in Figure 3. Connect

any ordinary button to the activation input - a

single press activates the unit. A key switch or code

lock, for example, can be connected to the

deactivation input.

Activation and deactivation inputs can be linked

together, in which case switching the unit on and

off will be done in the same way. In standby, the

trigger lines are normally short-circuited - a small

current flows in them. All sensors must be

connected in series, as shown in Figure 5. Tripping

of any sensor breaks the circuit and activates the

alarm. An additional advantage of this connection is

that attempting to disconnect the sensor circuit

from the unit will also trigger the alarm. Two alarm

outputs are available. On the first of these, in the

alarm state, there is a supply voltage, i.e., approx.

12 V, intended for connection to an audible or

other signalling device with a maximum current

consumption of 3 A. The second output is a relay

contact that can be used to switch any circuit, e.g.,

supplied with 230 VAC mains voltage. The device

has low standby power consumption (less than

2 mA), so it can successfully operate powered by a

photovoltaic cell, for example, as an outdoor area

alarm. The excess energy will recharge the battery,

which in turn will power the device at night.

Just bear in mind that the circuit has no protection

against overcharging the battery, so the power

supply battery source and charging current must be

selected (by changing the value of resistor R20) to

prevent this situation.

Fig. 3 Layout and function of connectors Fig. 4 Mounting diagram of the alarm unit

Immediate circuit

Delayed circuit

Signalling - immediate circuit

Signalling - delayed circuit

Alarm activation

Alarm deactivation

Power supply

BATT

Emergency power supply

Sounder

Relay contacts

Resistors:

R1-R4, R8-R11, R14, R16, R19: ......................100 kΩ

R5-R7, R13, R15:......................................................1 kΩ

R12, R18:....................................................................27 Ω

R17: ...........................................................................10 kΩ

R20: ...............................................................100 Ω / 2 W

Capacitors:

C1-C6, C8, C9, C11: ............................................100 nF

C7, C10: .....................................................220 uF / 25 V

Semiconductors:

D1–D4:..............................................Zener diode 5.1 V

D5, D8:..................................................................1N4148

D6, D7:..................................................................1N5822

T1: ......................................................IRL3803 or similar

T2: .........................................................BC548 or similar

IC1: ....................................................................LM2940-5

IC2: ..................................................................ATtiny2313

Other:

Jumper: .......................................................silvered wire

K1:......................................................................relay 12 V

SP1: ......................piezo transducer with generator

Connectors:..ARK2/500×10 pcs, ARK3/500×1 pcs.

List of components

Fig. 5 Connection of sensors to the alarm unit

Start mounting from soldering the components onto the board in order of size from smallest to largest.

Photographs of the mounted kit may be helpful.

Sensor 1

e.g., reed switch

Sensor 2 e.g.,

motion detector

Sensor 3 e.g.,

optical barrier

AVT SPV reserves the right to make changes without prior notice.Installation and connection of the appliance not in accordance with the instructions, unauthorised modification of

components and any structural alterations may cause damage to the appliance and endanger persons using it. In such a case, the manufacturer and its authorised representatives shall

not be liable for any damage arising directly or indirectly from the use or malfunction of the product.

The self-assembly kits are intended for educational and demonstration purposes only. They are not intended for use in commercial applications. If they are used in such applications, the

purchaser assumes all responsibility for ensuring compliance with all regulations

This symbol means do not dispose of your

product with your other household waste.

Instead, you should protect human health

and the environment by handing over your

waste equipment to a designated collection

point for the recycling of waste electrical

and electronic equipment.

Leszczynowa 11 Street,

03-197 Warsaw, Poland

https://sklep.avt.pl/

AVT SPV Sp. z o.o.