arduino-uno-schematic
ATMEGA8
ICSP
+5V
GND
+5V
+5V
GND
GND
GND
+5V
GND
100n
GND
47u 47u
GND GND
GND
GND
GREEN
GN
D
+5V
YELLOW
YELLOW
M7
GNDMC33269D-5.0
MC33269ST-5.0T3
100n
GND
500mA
+5V
+5V
100n
GND
YE
LL
OW
GND
FD
N3
04
V
+5VLM358D LM358D
GNDGND
+5...
ATMEGA8
ICSP
+5V
GND
+5V
+5V
GND
GND
GND
+5V
GND
100n
GND
47u 47u
GND GND
GND
GND
GREEN
GN
D
+5V
YELLOW
YELLOW
M7
GNDMC33269D-5.0
MC33269ST-5.0T3
100n
GND
500mA
+5V
+5V
100n
GND
YE
LL
OW
GND
FD
N3
04
V
+5VLM358D LM358D
GNDGND
+5V
100n
+5V
ATMEGA8U2-MU
GND
10
0n
ICSP
+5V
GND
GND
16MHz
16MHz
GN
D
PG
B1
01
06
04
PG
B1
01
06
04
BL
M2
1
1M
1K 1K
1K
1K
GND
10
K
10
K
10
K
10
K
100n
1u
1K
1K
1K
1K
22R
22R
22R
22R
1u
1M
16
MH
z
16
MH
z
TS
42
22
p
22
p
22
p
22
p
GN
D
GN
D
GND
27
R
(ADC5)PC5 28
(ADC4)PC4 27
(ADC3)PC3 26
(ADC2)PC2 25
(ADC1)PC1 24
(ADC0)PC0) 23
(SCK)PB5 19
(MISO)PB4 18
(MOSI)PB3 17
(SS)PB2 16
(OC1)PB1 15
(ICP)PB0 14
(AIN1)PD7 13
(AIN0)PD6 12
(T1)PD5 11
(T0)PD4 6
(INT1)PD3 5
(INT0)PD2 4
(TXD)PD1 3
(RXD)PD0 2
GND8
VCC7
AVCC20
AREF21
XTAL19
XTAL210
RESET1
AGND22
ZIC1
1 2
3 4
5 6
ICSP
1
2
3
4
5
6
7
8
IOL
1
2
3
4
5
6
7
8
IOH
1
2
3
4
5
6
AD
C2PC1 PC2
ON
RX
TX
D11
1
2
2
3 3
1
2
3
4P$
1
P$
1
P$
2
P$
2
X2
VI3
1
VO 2
IC2
ADJ
1
IN3 OUT 42
IC1
1
2
3
4
5
6
POWER
C4
F1
C7
L
T1
2
3
1
U1A
6
5
7
U1B
8
4
C1
(PCINT9/OC1B)PC5 25
(PCINT10)PC4 26
(INT4/ICP1/CLK0)PC7 22
(OC1A/PCINT8)PC6 23
(AIN2/PCINT11)PC2 5
(PCINT5)PB5 19
(T1/PCINT4)PB4 18
(PD0/MISO/PCINT3)PB3 17
(PDI/MOSI/PCINT2)PB2 16
(SCLK/PCINT1)PB1 15
(SS/PCINT0)PB0 14
(CTS/HWB/AIN6/TO/INT7)PD7 13
(RTS/AIN5/INT6)PD6 12
(XCK/AIN4/PCINT12)PD5 11
(INT5/AIN3)PD4 10
(TXD1/INT3)PD3 9
(RXD1/AIN1/INT2)PD2 8
(AIN0/INT1)PD1 7
(OC0B/INT0)PD0 6
GND3
VCC4
AVCC32
UVCC31
XTAL11
XTAL2(PC0)2
RESET(PC1/DW)24
UGND28
U3
PADEXP
UCAP27
D-30
D+29
(PCINT6)PB6 20
(PCINT7/OC0A/OC1C)PB7 21 C5
1 2
3 4
5 6
ICSP1
Y2Y1
21
UBOOT
Z1 Z2
2 1
GROUND
L1
21
RESET-EN
R2
1
8R
N2
A 2
7R
N2
B
36 RN2C
45 RN2D
1
8
RN
1A
2
7
RN
1B
3
6
RN
1C
4
5
RN
1D
C6
C8
18 RN4A
27 RN4B
3 6
RN4C
4 5
RN4D
18 RN3A
2 7
RN3B
3 6
RN3C
45 RN3D
C3
R1
2
1Q1
2
1Q2
1
3 4
2R
ES
ET
5
C1
0
C1
2
C9
C1
1
IN1
EN3
NC/FB 4
OUT 5
GND2
R3
+5V
+5V
GND
AREF
AREF
RESET
RESET
VIN
VIN
VIN
M8RXD
M8RXD
M8TXD
M8TXD
SCK
PWRIN
D-
D+
+3V3
+3V3
+3V3
MISO
MOSI
SS
SS
DT
R
GATE_CMD
CMP
USBVCC
USBVCC
USBVCC
XTAL2
XTAL2
XTAL1
XTAL1
VUCAP
RD-
RD-
RD+
RD+
RESET2
MISO2
MOSI2
SCK2
USHIELD
UG
ND
UGND
XUSB
XT2
XT2
XT1
XT1
RXLED
TXLED
AD0
AD1
AD2
AD3
AD4
AD5
IO2
IO1
IO0
IO3
IO4
IO5
IO6
IO7
IO8
IO9XT1R
+ +
US
B
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Arduino UNO Reference Design
USB boot En
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The product information on the Web Site or Materials is subject to change without notice. Do not finalize a design with this information.
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