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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
X1-2
F1
2A
POWER
X1-1
+5V
REG
PR1
1M
GND
Fig. 1. Schematic diagram
LED - Battery discharged
LED - Night time
LED - Day time
LED - Scare activation
Siren - Scare activation
Fig. 2.
+12V
US2
D1
78L05
1N4007
IN
OUT
GND
C1
C2
470u
100n
GND
+5V
LD1
Y
R1
LED
1k
PH1
FOTOREZYSTOR
"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.
+5V
C3
C4
V
100n
100u
+5V
+5V
8
R5
5
T
100k
LED
6
7
REG
FOTO
2
V
FOTO
3
1
4
GND
GND
+12V
D2
R3
1N4007
1M
R2
T
R4
100k
1k
GND
US1
VCC
PB0/PCINT0/AIN0/OC0A/MOSI
PB1/PCINT1/AIN1/OC0B/INT0/MISO
PB2/PCINT2/SCK/ADC1/T0
PB3/PCINT3/CLKI/ADC3
PB4/PCINT4/ADC2
PB5/PCINT5/RESET/ADC0/DW
GND
ATTINY25
+12V
X2-1
SIREN
X2-2
T1
BUZ11
GND
2
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