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schematic diagram
：
+5V
R7
1K
BOM:
GND
GND
No
name
Type/value
grade
No
Name
Type
grade
01
resistance
1K
R9~R15
20
audion
S8550
Q1
02
1K
R2~R8
21
S8550
Q2
03
2K
R16~R17
22
S8550
Q3
04
5.1K
R18
23
S8550
Q4
05
10K
R1
24
S8550
Q5
06
ceramic
capacitor
30P
C2
25
S8550
Q6
07
30P
C3
26
S8550
Q7
08
104
C4
27
MCU
AT89C2051
U1
09
104
C5
28
voltage
regulator
78L05
U2
10
electrolytic
capacitor
10uF/25V
C1
29
Quartz crystal
12MHz
Y1
11
100uF/16V
C6
30
connector
socket
5.
XH2.54
horizontal type
J2
2P
12
LED
Φ
3
红发红
D1
31
6.
XH2.54
vertical type
J1
2P
13
Φ
3 red
D2
32
tuch-button
6*6*4.3
S1
14
Φ
3 red
D3
33
6*6*4.3
S2
15
Φ
3 red
D4
34
6*6*4.3
S3
A
3
4
C
A
4
6
B
A
5
7
A
10
A
6
8
F
A
7
9
G
A
1
1
D
1
G
10uF
R1
C1
U1
RET
D2
+5V +5V D6
D1
+5V +5V D3
D5
+5V +5V D4
R2
1K
8550
8550
R3
1K
R4
1K
8550
R5
1K
R6
1K
8550
8550
1
VCC
20
10K
D6
2
RXD P3.0
P1.7
19
Q1
Q2
Q3
Q4
Q5
Q6
GND
D5
3
S1
TXDP3.1
P1.6
D3 D3
6
INT0P3.2
P1.5
S2
D4
7
S3
T1 P3.5
P1.2
18
R9
17
R10
16
R11
15
R12
14
R13
13
R14
12
R15
10
A1
+5V
PNP
+5V
A2
DS1
D1
DS2
D3
LED
DS3
D2
INT1P3.3
P1.4
A3
D2
8
T0 P3.4
P1.3
A4
LED
D2
D1 D1
9
A5
D4
LED
A8
11
GND
P3.7
P1.1 A1(+)
A6
4
LED
R16
2K
R17
2K
Y1
X1
P1.0 A1(-)
A7
5
C2
30P
X2
GND
+5V
12MHz
C3
AT89C2051
30P
A8
Q7
8550
GND
1K R8
J1
U3
2
U2
78L05
I
C4
104
+5V
J2
3
BUZ
0
CON2
R18
5.1K
C5
104
C6
100uF
CON2
a
a
f g bf g b
e d ce d c
dp
dp
a
a
f g bf g b
e d ce d c
dp
dp
a
a
f g bf g b
e d ce d c
dp
dp
2
1
2
1
A
1
1
D 2
D
P
A
2
3
E
5
A
3
4
C
A
4
6
B
A
5
7
A
10
A
6
8
F
A
7
9
G
A
1
1
D 2
D
P
A
2
3
E
5
2
D
P
A
2
3
E
5
A
3
4
C
A
4
6
B
A
5
7
A
10
A
6
8
F
A
7
9
G
