DigitalStopWatch.pdf

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PC0
TO PORTC
PC1
PC2
PC4
R1
4k7
Q3
BC558
R2
4k7
Q2
BC558
R3
4k7
Q1
BC558
R4
4k7
Q4
BC558
PD7
PD6
PD5
PD4
PD3
PD2
PD1
R5
R6
330R
R7
330R
R8
330R
R9
330R
R10
330R
R11
330R
330R
a
TO PORTD
g
7 x 330ohm
Power PINs of MCU Not Shown
Connect PIN7 -> Vcc (5V)
Connect PIN8 -> GND (0V)
R16
4k7
R15
4k7
R14
4k7
R12
4k7
U1
HALT
S3
1
S2
1
S1
1
X1
X2
(-)
SW1
TOGGLE
D1
1
1N4007
U2
7805
VI
GND
VO
3
14
15
16
17
18
19
9
10
PB0/ICP1
PB1/OC1A
PB2/SS/OC1B
PB3/MOSI/OC2
PB4/MISO
PB5/SCK
PB6/TOSC1/XTAL1
PB7/TOSC2/XTAL2
PC0/ADC0
PC1/ADC1
PC2/ADC2
PC3/ADC3
PC4/ADC4/SDA
PC5/ADC5/SCL
PC6/RESET
PD0/RXD
PD1/TXD
PD2/INT0
PD3/INT1
PD4/T0/XCK
PD5/T1
PD6/AIN0
PD7/AIN1
23
24
25
26
27
28
1
2
3
4
5
6
11
12
13
RESET
START
PC0
PC1
PC2
PC3
2
2
2
R13
330R
CRYSTAL
16MHz
PWR
(+)
DC SOCKET
C3
470u
C4
100n
D2
LED
C1
22p
C2
22p
21
20
AREF
AVCC
ATMEGA8
PD1
PD2
PD3
PD4
PD5
PD6
PD7
2

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