1
1
2
2
3
3
4
4
D D
C C
B B
A A
C3
22P
C4
22P
Y1
11.0592M
R1
10K
+5V
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
P3.0
10
P3.1
11
P3.2
12
P3.3
13
P3.4
14
P3.5
15
P3.6
16
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
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
IC1 AT89S52
+5V
C5
10uf
RST
C1
470u
C2
0.1uf
Vin
3
Gnd
1
Vout
2
IC3 AMS1117
C6
470uf
2
URXD
4
GPIO0
6
GPIO2
8
GND
1
VCC
2
RST
5
CH-PD
7
UTXD
JP1
CZ8
+3.3V
GND
VCC
1
Dout
2
NC
3
GND
4
C
DHT11
+5V
P1.0
P1.0
P3.5
P3.6
C7
104
P3.4
R3
1K
R4
1K
LED1
LED2
R5
1K
LED3