A
B
C
DD
C
B
A
R4
10k
A0
1
A1
2
A2
3
Vss
4
Vcc
8
WP
7
SCL
6
SDA
5
U2
24C02A
R3
10k
GND
2402_SCL
2402_SDA
1
2
3
4
U3
DHT11
DATA
RST
9
RXD/P3.0
10
INT0/P3.2
12
INT1/P3.3
13
T0/P3.4
14
T1/P3.5
15
EA/VPP
31
XTAL1
19
GND
20
P0.0/AD0
39
P0.1/AD1
38
P0.2/AD2
37
P0.3AD3
36
P0.4/AD4
35
P0.5/AD5
34
P0.6/AD6
33
P0.7/AD7
32
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
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
P2.7/A15
28
ALE/PROG
30
TXD/P3.1
11
WR/P3.6
16
RD/P3.7
17
PSEN
29
XTAL2
18
VCC
40
U1
STC89C52
Y1
12M
C2
30pF
C3
30pF
R2
10K
C1
10uF
+5V
GND
R1
10K
2402_SDA
2402_SCL
DATA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
J6
单片 机系 统传感 器接口
液晶 屏接口
EEPROM存储器电路
P00
P01
P02
P03
P04
P05
P06
P07
1602_RS
P00
P01
P02
P03
P04
P05
P06
P07
R5
1.5K
R6
10K
+5V
GND
GND
S3
SET
S2
ADD
S1
SUB
R7
1K
R11
1K
Q1
9012
Q3
9012
+5V
+5V
jiangwen
qushi
Kj1
Kj3
D1
D3
R8
2.2K
R12
2.2K
+5V
继电 器驱 动
GND
+5V
3
2 1
P1
POWER
1
1
2
2
3
3
4
4
5
5
6
6
SZ
+5V
电源
GND
GND
GND
COM
1
R1
2
R2
3
R3
4
R4
5
R5
6
R6
7
R7
8
R8
9
RP2 103
R9
1K
Q2
9012
+5V
shengwen
Kj2
D2
R10
2.2K
GND
R13
1K
Q4
9012
+5V
jiashi
Kj4
D4
R14
2.2K
GND
jiangwen
shengwen
qushi
jiashi
D5
1N4148
D6
1N4148
D7
1N4148
D8
1N4148
1602_RS
1602_EN
1602_EN
按 键
SET
SET
ADD
ADD
SUB
SUB
1
2
J1
接线端子
1
2
J2
接线端子
1
2
J3
接线端子
1
2
J4
接线端子
Q5
9012
LS1
R15
2.2K
+5V
GND
FMQ
GND
GND
S5
拨动开关
FMQ
OK
S4
OK
OK
RX
TX
VCC1
1
DTR
2
TX
3
RX
4
SP
5
MIC
6
RESET
7
GND
8
U2
SIM900A
+
C4
470uF
D1
1N4007
RX
TX
+5V
GND
GND
GSM模 块
Print to PDF without this message by purchasing novaPDF (http://www.novapdf.com/)