PE6 (INT6/AIN0) 1
UVcc 2
D-
3
D+
4
UGnd
5
UCap 6
VBus
7
PB0 (SS/PCINT0)
8
PB1 (PCINT1/SCK)
9
PB2 (PDI/MOSI/PCINT2)
10
PB3 (PDO/MISO/PCINT3)
11
PB7 (OC0A/OC1C/PCINT7/RTS)
12
RESET
13
VCC 14
GND
15
XTAL2
16
XTAL1
17
PD0 (INT0/SCL/OC0B)
18
PD1 (INT1/SDA)
19
PD2 (INT2/RXD1)
20
PD3 (INT3/TXD1)
21
PD5 (XCK1/CTS)
22
GND
23
AVCC 24
PD4 (ICP1/ADC8)
25
PD6 (T1/OC4D/ADC9
26
PD7 (T0/OC4D/ADC10)
27
PB4 (PCINT4/ADC11)
28
PB5 (OC1A/OC4B/PCINT5/ADC12)
29
PB6 (OC1B/OC4B/PCINT6/ADC13)
30
PC6 (OC3A/OC4A) 31
PC7 (ICP3/CLK0/OC4A) 32
PE2 (HWB) 33
VCC 34
GND
35
PF7 (ADC7/TDI) 36
PF6 (ADC6/TDO) 37
PF5 (ADC5/TMS) 38
PF4 (ADC4/TCK) 39
PF1 (ADC1) 40
PF0 (ADC0) 41
AREF 42
GND
43
AVCC 44
PAD
45
ATmega32U4
VBUS 1
D- 2
D+ 3
ID 4
GND 5
NC
6NC
7NC
8NC
9NC
10 NC
11
USB Micro-B
1 uF
C2
5V
L1
10 uH
0.1 uF
C1
AVCC
5V AVCC
0.1 uF
C3
VBUS
22
R2
22
R3
nRESET
D14
D16
D15
PD5
D2
Green
1.5k
R6
PD5
D8
D9
D10
D11
D3
D2
D0
D1
D4
D12
D6
D7
D5
D13
A0
A1
5V
D4
Yellow
2.21k
R10
D13
AREF
PE2
A2
A3
A4
A5
D17
D3
Red
2.21k
R7
D17
5V
Y1 16 MHz
10 pF
C4
10 pF
C5
SW1
SW3
Button B
SW4
Button C
1kR8
3kR12 3kR13
1.5kR9
SW2
Button A
D14
1k
R11
BuzzerD1
Q1
100k
R14
5V
D6
20k
R4
VSW
BATLEV
10k
R5
A1BZCTRL
(SDA)
(SCL)
(MOSI)
(MISO)
(SCK)
AVR3V3
(RXL/SS)
(TXL)
5V
clockwise
R1
D0
D1
D14
D17
D13
PD5
Vss 1
VDD 2
Vo 3
RS 4
R/W 5
E6
DB0 7
DB1 8
DB2 9
DB3 10
DB4 11
DB5 12
DB6 13
DB7 14
LCD
3pi+ 32U4 Control Board
©2020 Pololu Corporation
www.pololu.com
Schematic diagram
Microcontroller and user interface
Page 1 of 4
R®
1
2
EMIT
D4
D5
D11
D12
A0
A2
A3
A4
BUMPL
BUMPR
DOWN1
DOWN2
DOWN3
DOWN4
DOWN5
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
3
1
2
3D2D3
5V
(SDA)(SCL)
3V3
D0 D1
D6A1
A5 PE2
1
2
4
3
5
6
7
D2D3 (SDA)(SCL) 1
2
4
3
5
6
7
5V 5V
MISO
1VCC 2
SCK
3
MOSI
4
RST
5GND 6
AVRISP
5V
nRESET
D14
D16
D15
Front expansion header Mid expansion header
