P00
P01
P02
P03
P04
P05
P06
P07
P00
P01
P02
P03
P04
P05
P06
P07
GND
VCC
P23
P24
P22
P22
P23
P24
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
LED8
LED7
LED6
LED5
LED4
LED3
LED2
LED1
RST
RST
P37
P37
P30
P31
P32
P33
P31
P30
P32
P33
P00
P01
P02
P03
P04
P05
P06
P07
P20
P21
P22
P23
P24
P25
P26
P27
BEEP
BEEP
28.0
DQ
2
VCC
3
GND
1
U1
DS18B20
XTAL2
18
XTAL1
19
ALE
30
EA
31
PSEN
29
RST
9
P0.0/AD0
39
P0.1/AD1
38
P0.2/AD2
37
P0.3/AD3
36
P0.4/AD4
35
P0.5/AD5
34
P0.6/AD6
33
P0.7/AD7
32
P1.0/T2
1
P1.1/T2EX
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
P3.0/RXD
10
P3.1/TXD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.7/RD
17
P3.6/WR
16
P3.5/T1
15
P2.7/A15
28
P2.0/A8
21
P2.1/A9
22
P2.2/A10
23
P2.3/A11
24
P2.4/A12
25
P2.5/A13
26
P2.6/A14
27
U2
AT89C52
C2
33P
12
X1
CRYSTAL
C1
33P
A0
2
B0
18
A1
3
B1
17
A2
4
B2
16
A3
5
B3
15
A4
6
B4
14
A5
7
B5
13
A6
8
B6
12
A7
9
B7
11
CE
19
AB/BA
1
U3
74HC245
R1
10k
R2
10k
R3
10k
R4
10k
R5
10k
R6
10k
R7
10k
R8
10k
A
1
B
2
C
3
E1
6
E2
4
E3
5
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
U4
74HC138
VCC
C3
10uf
R9
10k
R10
10k
R11
10k
R12
10k
R13
10k
R14
10k
R15
10k
R16
10k
R17
10k
R18
10k
R19
10k
R20
10k
R21
10k
R22
10k
R23
10k
R24
10k
R25
10k
BUZ1
BUZZER
R26
100k
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