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schematic diagram：
C1
10uF
U1
R1
1
RET
10K
D6
2
RXD P3.0
GND
D5
3
TXD P3.1
S1
D3 D3
6
INT0P3.2
S2
D4
7
INT1P3.3
D2
D2
8
T0 P3.4
D1 D1
9
T1 P3.5
S3
A8
11
P3.7
GND
4
X1
Y1
5
X2
C2
30P
C3
12MHz
AT89C2051
30P
GND
BOM:
No
name
Type/value
01
02
resistance
03
04
05
06
07
08
ceramic
09
capacitor
10
electrolytic
11
capacitor
12
LED
13
14
15
www.amazon.com/shops/icstation
+5V
D2
+5V +5V D6
R2
1K
20
VCC
19
Q1
P1.7
R9
18
A1
P1.6
R10
17
A2
P1.5
R11
16
A3
P1.4
f
g
R12
15
A4
P1.3
e d ce d c
R13
14
A5
P1.2
R14
13
A6
P1.1 A1(+)
R15
12
A7
P1.0 A1(-)
10
+5V
GND
Q7
A8
8550
1K R8
J1
U3
2
BUZ
1
R18
5.1K
CON2
GND
grade
1K
R9~R15
1K
R2~R8
2K
R16~R17
5.1K
R18
10K
R1
30P
C2
30P
C3
104
C4
104
C5
10uF/25V
C1
100uF/16V
C6
D1
Φ3 红发红
D2
Φ3 red
D3
Φ3 red
D4
Φ3 red
D1
+5V +5V D3
R3
R4
8550
8550
8550
1K
1K
Q2
Q3
+5V
DS1
D1
a
a
a
f
f
f
b
g
b
g
b
LED
D2
e d ce d c
dp
dp
dp
LED
R16
2K
U2
78L05
+5V
J2
2
3
I
0
2
C4
C5
1
104
104
CON2
GND
No
Name
20
21
22
audion
23
24
25
26
27
MCU
28
voltage
regulator
29
Quartz crystal
30
connector
socket
31
32
tuch-button
33
34
D5
+5V +5V D4
R5
R6
8550
8550
1K
1K
Q4
Q5
PNP
+5V
DS2
D3
a
a
a
LED
f
f
g
b
g
b
g
b
D4
e d ce d c
LED
dp
dp
R17
2K
C6
100uF
Type
grade
S8550
Q1
S8550
Q2
S8550
Q3
S8550
Q4
S8550
Q5
S8550
Q6
S8550
Q7
AT89C2051
U1
78L05
U2
12MHz
Y1
J2
XH2.54
5.
horizontal type
2P
J1
XH2.54
6.
vertical type
2P
6*6*4.3
S1
6*6*4.3
S2
6*6*4.3
S3
R7
1K
Q6
DS3
dp
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