Vss
1
VDD
2
Vo
3
RS
4
R/W
5
E
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
LCD
5V
D7
D8
c
lo
c
k
w
is
e
R21
10k
D13
TXL
RXL
MISO
DB3
DB2
DB1
DB0
1k
R24
R/W
J18A
J18B
J18C
J18D
J18I
J18J
Buzzer
D5
Q4
100k
R16
BZCTRL
5V
30.1k
R13
20k
R15
VIN
BATLEV
20k
R14
D2
Green
1.5k
R4
TXL
5V
D1
Yellow
2.21k
R3
D13
D3
Red
2.21k
R5
RXL
5V
1k
R19
1.5k
R20
SW3
B
SW4
C
SW2
A
1k
R27
MISO
3k
R23
3k
R22
A-Star 32U4 Prime LV
©
2019 Pololu Corporation
www.pololu.com
Schematic diagram
On-board hardware
Page 3 of 6
1
2
4
3
5
6
7
8
9
10
11
DB0
DB1
DB2
DB3
DB4
DB5
DB6
E
RS
E
RS
R/W
DB4
DB5
DB6
DB7
DB7
R