1
1
2
2
3
3
4
4
D D
C C
B B
A A
Title
Number RevisionSize
A4
Date: 2021/5/17 Sheet of
File: I:\办公2021下\..\Previous Backup of 原理图.SchDrawn By:
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
REST
9
P3.0/RXD
10
P3.1/TXD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.5/T1
15
P3.6/WR
16
P3.7/RD
17
XTAL2
18
XTAL1
19
GND
20
P2.0
21
P2.1
22
P2.2
23
P2.3
24
P2.4
25
P2.5
26
P2.7
28
SPEN
29
ALE
30
EA
31
P0.7
32
P0.6
33
P0.5
34
P0.4
35
P0.3
36
P0.2
37
P0.1
38
P0.0
39
VCC
40
P2.6
27
STC89C52
U1
STC89C52
C1
30P
C2
30P
+
C3
10uf
1
2
3
4
5
6
7
8
9
J1
10K
Y1
12MHZ
GND
R1
10K
GND
+5
In3
1
In5
3
In6
4
In7
5
START
6
EOC
7
D3
8
OE
9
CLOCK
10
Vcc
11
Vref+
12
GND
13
D1
14
D2
15
Vref-
16
D0
17
D4
18
D5
19
D7
21
ALE
22
ADDC
23
ADDB
24
ADDA
25
In0
26
In1
27
In4
2
D6
20
In2
28
ADC0809
ADC1
ADC0809
+5
GND
D0
D1
D2
GND
D3
D4
D5
D6
D7
ST
ST
ST
EOC
EOC
OE
OECLK
CLK
D0
D1
D2
D3
D4
D5
D6
D7
IN
Q5
8550
+5
GND
FR1
2.2k
IN
+5
k1
k2
k3
A
B
C
D
E
F
G
DP
Q1
8550
Q2
8550
Q3
8550
Q4
8550
+5
R1
4.7k
R2
4.7k
R3
4.7k
R4
4.7k
F
F
+5
3
2 1
P1
POWER
1
1
2
2
3
3
4
4
5
5
6
6
S1
+5
GND
D1
LED
S2 S3 S4
S3
SW SPST
S1
S2
S3
GND
k1
k2
k3
a
b
c
g
d
e
f
dp
=
a
b
c
g
d
e
f
dp
=
a
b
c
g
d
e
f
dp
=
a
b
c
g
d
e
f
dp
=
E
D
DP
C
G
COM4 B
COM3
COM2
F
A
COM1
UP VIEW
LED
A B
CDE
F
GDP
S4
S3
S2
S1
S1
电源
单片机系统
AD数模转换
按键
四位共阳数码管
报警电路
1
2
3
4
U3
A0
+5
GND
土壤传感器
Kj1
FR1
2.2k
GND
1
2
3
J4
CON3
