Circuit diagram

1
1
2
2
3
3
4
4
D D
C C
B B
A A
Title
Number RevisionSize
A4
Date: 2014-7-7 Sheet of
File: F:\ZQ\..\RS485shield-v2.SchDoc Drawn By:
D1
10K
R2
R5
10K
GND
3
1
2
Q1
2N7002
RST
1
VCC3.3
2
VCC5.0
3
GND
4
GND
5
VDD-IN
6
ADC0
7
ADC1
8
ADC2
9
ADC3
10
ADC4
11
ADC5
12
RXD/PD0
13
TXD/PD1
14
INT0/PD2
15
INT1/PD3
16
T0/PD4
17
T1/PD5
18
AIN0/PD6
19
AIN1/PD7
20
ICP/PB0
21
OC1/PB1
22
SS/PB2
23
MOSI/PB3
24
MISO/PB4
25
SCK
26
GND
27
AREF
28
U1
Arduino-Board
GND
GND
R
1
RE
2
DE
3
D
4
GND
5
A
6
B
7
VCC
8
U2
75LBC184
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P3
Header 8X2A
GND
1
2
3
P2
Header 3
TX
GND
TX/RX
1 2 3
P1
Header 3
VCC-SLC
5V
5V
3.3V
3.3V
VCC-SLC
TX
RX
104
C1
GND
270R3
TX/RX
D2
R4
510
R1
510
D0
D1
D2
D3
D4
D5
D6
D7
1
2
3
4
5
6
7
8
P4
Header 8
TX RX
VCC-SLC
1
2
H1
D0
D1 D2
D3
D4
D5
D6
D7
VCC-SLC
1
2
H2
R7
1K
R6
1K
GND
VCC-SLC
3
1
2
Q2
2N7002
3
1
2
Q3
2N7002
GND
VCC-SLC
GND GND
VCC-SLC
RXTX