Schematics

3.3V
GND
GND
3.3V
5V
3.3V
5V 3.3V
D0/RX
2
D1/TX
1
RESET
3*2
GND
4*2
D2
5
D3
6
D4
7
D5
8
D6
9
D7
10
D8
11
D9
12
D10
13
D11
14
D12
15
VIN
30
5V
27
A0
19
A1
20
A2
21
A3
22
A4/SDA
23
A5/SCL
24
A6
25
A7
26
AREF
18
3V3
17
D13
16
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
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