Schematic

ATMEGA328P-AU
0.1uF
GND
10uF
GND GND
4.7K
500mA-PTC
Red
GND
GND
10K
Reset
GND
ISP
GND
0.1uF
GND
GND
POWER
0.1uF
GND
330
Green
GND
LiPo
LP2985-50DBVR
10uF
GND
GNDGND
3.3V
LIPO
3.3V
3.3V
3.3V 3.3V
3.3V
3.3V
3.3V
COM
External
GND
LIPO
External
GND
5V
1K
1K
16MHz
GND
Select
BUZZERNS
0.1uF
(ADC5)PC5
28
(ADC4)PC4
27
(ADC3)PC3
26
(ADC2)PC2
25
(ADC1)PC1
24
(ADC0)PC0)
23
(SCK)PB5
17
(MISO)PB4
16
(MOSI)PB3
15
(SS)PB2
14
(OC1)PB1
13
(ICP)PB0
12
(AIN1)PD7
11
(AIN0)PD6
10
(T1)PD5
9
(T0)PD4
2
(INT1)PD3
1
(INT0)PD2
32
(TXD)PD1
31
(RXD)PD0
30
GND
5
VCC
4
AVCC
18
AREF
20
XTAL1
7
XTAL2
8
RESET
29
AGND
21
U1
C10
C13
R11
F1
LED1
R2
1 3
42
S2
1 2
3 4
5 6
JP3
C3
1
2
3
4
5
6
JP2
1
2
3
4
5
J1
6
7
8
1
2
3
4
5
J3
6
7
8
1
2
3
4
5
J2
6
C1
R6
D3
1
2
JP1
IN
GND
OUT
U2
EN
BP
C19
DTR
RXI
TXO
VCC
CTS
JP5
GND
1
2
JP6
1
2
JP7
R1
R3
Q1
S1
B1
C2
GND
GND
GND
AREF
AREF
RESET
RESET
RESET
SCK
SCK
5V
5V
MISO
MISO
MOSI
MOSI
3.3V
3.3V
VCC
VCC
LIPO
LIPO
RX-I
RX-I
TX-O
TX-O
D10
D9
D8
A5
A4
A3
A2
A1
A0
D7
D6
D5
D5
D4
D4
D3
D2
DTR
DTR
MOSI
RESET
SCK
MISO
+5
GND
Gnd
Gnd Gnd
OSEPP Pro (Arduino Compatible)
OSEPP-PRO-01 (Rev1.1)
1. '3.3V' is 3.3V when using 8MHz resonator, and 5V when using 16MHz
2. '16 MHz' is 16MHz when using 5.0V, and 8MHz when using 3.3V
Notes:
Based on Arduino Pro Design