Schematic

PC6 (RESET)
29
PD0 (PTCXY/OC3A/RXD0)
30
PD1 (PTCXY/OC4A/TXD0)
31
PD2 (PTCXY/INT0/OC3B/OC4B)
32
PD3 (OC2B/INT1/PTCXY)
1
PD4 (XCK0/T0/PTCXY)
2
PE1 (SCL1/T4/PTCXY)
6
GND
5
PB6 (XTAL1/TOSC1)
7
PB7 (XTAL2/TOSC2)
8
PD5 (OC0B/T1/PTCXY)
9
PD6 (OC0A/PTCXY/AIN0)
10
PD7 (PTCXY/AIN1)
11
PB0 (ICP1/CLKO/PTCXY)
12
PB1 (OC1A/PTCXY)
13
PB2 (SS0/OC1B/PTCXY)
14
PB3 (MOSI0/TXD1/OC2A/PTCXY)
15
PB4 (MISO0/RXD1/PTCXY)
16
PB5 (PTCXY/XCK0/SCK0)
17
AVCC
18
AREF
20
GND
21
PC0 (ADC0/PTCY/MISO1)
23
PC1 (ADC1/PTCY/SCK1)
24
PC2 (ADC2/PTCY)
25
PC3 (ADC3/PTCY)
26
PC4 (ADC4/PTCY/SDA0)
27
PC5 (ADC5/PTCY/SCL0)
28
PE0 (SDA1/ICP4/ACO/PTCXY)
3
VCC
4
PE2 (ADC6/PTCY/ICP3/SS1)
19
PE3 (ADC7/PTCY/T3/MOSI1)
22
PAD
33
ATmega328PB
A0
A1
A2
A3
A4
A5
nRESET
D0
D1
D2
D3
D5
D4
D6
D7
D8
D9
D10
D11
D13
D12
AREF
AVCC
A6
A7
SDA1
SCL1
L1
10 uH
0.1 uF
C1
VCC AVCC
VCC
VCC
4.7 uF
C3
IN
1
ON/OFF
3
OUT
5
NC
4
GND
2
100mA LDO
BAT+
1 uF
C2
1
R2
0.1 uF
C4
0.1 uF
C5
D1
VIN
D2
Yellow
R4
D13
VCC
D3
R5
SW1
0.1 uF
C6
VCC
10k
R3
D/R
VCCIN
100k
R1
1 3
2 Y1
D8
D9
D6
D7
D4
D5
D2
D3
nRESET
D1 (TX)
D0 (RX)
D13
A1
A0
A3
A2
D0 (RX)
D1 (TX)
VCCIN
D/R
A4
AREF
VIN
D11
D10
D12
SDA1
SCL1
A6
A5
A7
1
2
4
3
5
6
1
2
4
3
5
6
7
8
9
10
11
12
1
2
4
3
5
1
2
4
3
5
6
7
8
9
10
11
12
1
2
3
4
MISO
1
VCC
2
SCK
3
MOSI
4
RST
5
GND
6
AVRISP
A-Star 328PB Micro
©2018 Pololu Corporation
www.pololu.com
nRESET
D12
D13
D11
VCC
VCCVCC
BAT+
(CTS)
R
Pololu item # VCC Y1 frequency D3 color R4 R5
3160 5 V 16 MHz Blue 2.21k 4.7k
3161 5 V 20 MHz Red 2.21k 2.21k
3162 3.3 V 8 MHz Green 1k 1k
3163 3.3 V 12 MHz Yellow 1k 1k
PIC101
PIC102
COC1
PIC201
PIC202
COC2
PIC301
PIC302
COC3
PIC401
PIC402
COC4
PIC501
PIC502
COC5
PIC601 PIC602
COC6
PID101 PID102
COD1
PID201
PID202
COD2
PID301
PID302
COD3
PIJ601 PIJ602
PIJ603
PIJ604
PIJ605 PIJ606
COJ6
PIJP101
PIJP102
PIJP103
PIJP104
PIJP105
PIJP106
COJP1
PIJP201
PIJP202
PIJP203
PIJP204
PIJP205
PIJP206
PIJP207
PIJP208
PIJP209
PIJP2010
PIJP2011
PIJP2012
COJP2
PIJP301
PIJP302
PIJP303
PIJP304
PIJP305
COJP3
PIJP401
PIJP402
PIJP403
PIJP404
PIJP405
PIJP406
PIJP407
PIJP408
PIJP409
PIJP4010
PIJP4011
PIJP4012
COJP4
PIJP501
PIJP502
PIJP503
PIJP504
COJP5
PIL101 PIL102
COL1
PIQ101
PIQ102
PIQ103
COQ1
PIR101
PIR102
COR1
PIR201
PIR202
COR2
PIR301
PIR302
COR3
PIR401
PIR402
COR4
PIR501
PIR502
COR5
PISW101
PISW102
COSW1
PIU101
PIU102
PIU103
PIU104
PIU105
PIU106
PIU107
PIU108
PIU109
PIU1010
PIU1011
PIU1012
PIU1013
PIU1014
PIU1015
PIU1016
PIU1017
PIU1018
PIU1019
PIU1020
PIU1021
PIU1022
PIU1023
PIU1024
PIU1025
PIU1026
PIU1027
PIU1028
PIU1029
PIU1030
PIU1031
PIU1032
PIU1033
COU1
PIVCC01
PIVCC02
PIVCC03 PIVCC04
PIVCC05
COVCC
PIY101
PIY102
PIY103
COY1