1 2 3 4
A
B
C
D
4321
D
C
B
A
P1 .0
1
P1 .1
2
P1 .2
3
P1 .3
4
P1 .4
5
P1 .5
6
P1 .6
7
P1 .7
8
RST
9
(RXD)P3.0
10
(TXD)P3.1
11
(INT0 )P3.2
12
(INT1 )P3.3
13
(T0)P3 .4
14
(T1)P3 .5
15
(WR )P 3. 6
16
(RD)P3.7
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 .6
27
P2 .7
28
PSEN
29
ALE/PROG
30
EA/VPP
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
U1
U1
Y1
12 M
C2 20 pF
C3 20 pF
VCC
R2
10 K
C1 10 uF
VCC
S1
P10
P11
P12
GND
1
VCC
2
VO
3
RS
4
RW
5
E
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
BG/VCC
15
BG/GND
16
LCD1 LCD16 0 2
VCCVCC
P10
P11
P12
VO
R1
2K
P00
P01
P02
P03
P04
P05
P06
P07
S3 S4 S5 S6
S7 S8 S9 S1 0
S1 1 S1 2 S1 3 S1 4
S1 5 S1 6 S1 7 S1 8
P33
P32
P31
P30
P3 4
P3 5
P3 6
P3 7
矩阵键盘
P3 0
P3 1
P3 2
P3 3
P3 4
P3 5
P3 6
P3 7
复位键
VCC
SCK
DT
HX711AD模块接口
B1
蜂鸣器
Q5
9012
VCC
+
电源电路
VCC
3
2
1 4
5
6
SW 1
电源开关
3
2 1
P1
电源输入
RESET
1
DAC
2
PW M+
3
PW M-
4
P1 4
5
P1 3
6
P1 6
7
GND
8
P1 5
9
P0 3
10
P0 2
11
P0 1
12
NC
13
VCC
14
BUSY
15
VDD
16
U5
WT588 D
1
2
P3
扬声器
语音 模块
VCC
VCC
1
SCK
2
DT
3
GND
4
P2
HX7 11