Avt 3135 User manual

The presented scare is a very effective and

environmentally friendly method of bird deterrence. It

is a microprocessor-based version of the scare for

starlings. The sound emitted, with a volume of more

than 100 dB, will successfully flush out not only birds

but also small rodents from the garden or warehouse.

Characteristics

• randomly activated beep

• smooth adjustment of siren on frequency

• integrated twilight switch

• supply voltage level check - LED

• light sensor function check - LED

• power supply 12 V / 1 A (battery)

• board sizes: 40×62 mm

Flushing out birds from certain locations sometimes

becomes a necessity. Above all, the mass occurrence

of starlings can destroy the many-month work by fruit

growers. The presented microprocessor-based bird

scare was designed to effectively control bird pests. It

is sufficient as basic protection against birds

consuming the fruit from the plantation. The repellent

is a device that randomly emits a one-tone sound at a

very high volume. Thanks to the twilight switch, the

sound signal will only be activated during the day

and, regardless of the settings selected, the user can

be sure that the scare will not switch on at night.

The schematic diagram of the scare is shown in Figure

1. The circuit must be powered from a 12 V battery,

e.g. gel battery or stabilised power supply also with

12 VDC and an output current of approximately 1 A.

D1 diode in series with the power supply protects the

circuit against incorrect input voltage polarity.

Capacitors C1...C4 act as a supply filter. Input voltage

from the screw connector X1 goes to the US2

stabiliser. The LDO stabiliser was used to reduce

current consumption. The scare operation is

controlled by a US1 ATtiny25 microcontroller clocked

by an internal clock signal. Resistive divider made up

of resistors R3 and R4 connected to port PB3 allows

the programme in the microcontroller to measure the

battery voltage without the risk of damaging it with

too high a voltage. To make the circuit work sparingly

and only during the day, a photoresistor PH1 was

used, which, together with resistor R5, forms another

resistance divider. Voltage signal, dependent on

lighting, goes to the PB4 port of the microcontroller.

Circuit description

Electronic Bird Scare

AVT 3135

kits

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ASSEMBLY DIFFICULTY

Fig. 1. Schematic diagram

Fig. 2.

To simplify operation, the circuit uses only one setting

element. This is potentiometer PR1, which is used to

set the siren switching on frequency. Adjustment

times range from 5 to 30 minutes. For the device to

generate a deterrent sounds randomly, the

programme was developed in such a way that using

the value set by the potentiometer, it recalculates it

together with the signal from the photoresistor.

The design of the programme also takes into account

the number of signals and the duration of the siren at

the designated time. This can be from 3 to 8 signals

lasting from 2 to 5 seconds. Figure 2 shows LED

"flashing" to interact with the user. When the battery

is discharged, three short flashes appear every few

seconds. From dusk to dawn, the LD1 diode is

extinguished in order to minimise current

consumption. During the day, every few seconds the

LED flashes, indicating correct operation of the scare.

When the scaring is activated, the LED is switched on

and 2 seconds later, via transistor T1 starts the

acoustic siren that must be connected to screw

connector X2, bearing in mind its polarity.

ATTINY25

78L05

POWER

SIREN

1N4007

470u 100u100n 100n

GND

+5V

GND

+5V

GND

+5V

BUZ11

GND

+12V +12V

1N4007

100k

GND

+12V

100k

+5V

FOTOREZYSTOR

GND

PB5/PCINT5/RESET/ADC0/DW

PB3/PCINT3/CLKI/ADC3

PB4/PCINT4/ADC2

PB0/PCINT0/AIN0/OC0A/MOSI

PB1/PCINT1/AIN1/OC0B/INT0/MISO

PB2/PCINT2/SCK/ADC1/T0

VCC

GND

US1

GND

IN OUT

US2

X1-1

X1-2

X2-1

X2-2

C1 C4C2 C3

PR1

LD1

R2 T1

PH1

FOTO

REG

LED

LED - Battery discharged

LED - Night time

LED - Day time

LED - Scare activation

Siren - Scare activation

List of components

Resistors:

R1, R2:..................1 kΩ (brown-black-red-gold)

R3: .........................1 MΩ (brown-black-green-gold)

R4, R5:..................100 kΩ (brown-black-yellow-gold)

PR1:.......................mounting potentiometer 1 MΩ (105)

PH1: ......................photoreistor

Capacitors:

C1: .........................470 μF !

C2, C3:..................100 nF (may be designated 104)

C4: .........................100 μF !

Semiconductors:

D1, D2:.................1N4007 !

LD1:.......................any LED !

US1: ......................ATtiny25 + socket !

US2: ......................LM2931 !

T1: .........................BUZ11 (or similar) !

Other:

F1:..........................fuse 2 A

X1, X2:..................screw connectors

Alarm siren 12 V

Mount the circuit on a board whose design is shown

in Figure 3. Photographs will be also helpful when

mounting. All components are mounted on a single-

sided printed circuit board with size 40 x 62 mm. Start

mounting the circuit from soldering resistors and

other small-size components and end up with screw

connectors and insertion of the US1 integrated circuit

into the socket. Once the circuit is mounted, you need

very carefully check that the components have not

been soldered in the wrong direction or at the wrong

locations and that no short-circuits of the soldering

points have occurred during soldering. A mistake at

this stage of the mounting work can result in damage

to components or even explosion.

Circuit flawlessly assembled from functioning

components will work straight away.

Figure 4 shows the correct way to connect the siren

and power supply to the board. If the scare will be

exposed to direct weather conditions, it can be built

into the optional Z-54 enclosure to which the PCB is

fitted. Photograph 2 shows the board housed in the

aforementioned enclosure. When using the AC

adapter to power the scare, it must also be protected

from rain and moisture to prevent possible damage

or electrocution to the user.

Mounting and start-up

Fig. 3. Photo 2

Start mounting from soldering the

components onto the board in order of

size from smallest to largest. When

mounting components marked with an

exclamation mark, pay attention to their polarity.

Photographs of the mounted kit may be helpful.

To access the high-resolution images as links,

download the PDF.

US2

LD1

US1 T1

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Fig. 4

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.