SCL
SDA
AREF
GND
13
12
~11
~10
~9
8
7
~6
~5
4
~3
2
1
0
IOREF
RESET
3.3V
5V
GND
GND
VIN
A0
A1
A2
A3
A4
A5
DIGITAL (PWM ~)
POWER
ANALOG IN
UNO
CH340G
ATMEGA328P
−
−
+
+
−
−
+
+
1
1
5
5
10
10
15
15
20
20
25
25
30
30
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
CLK
DT
SW
+
GND
KY-040
U2 · KY-040
U1 · Arduino UNO
U1 · Arduino UNO
U2 · KY-040
2
2
4
4
6
6
8
8
10
10
12
12
13
13
14
14
15
15
16
16
f
f
g
g
j
j
MODEL · DC simulation
USB 44.9 mA
0 A
4.99 V
4.99 V
4.99 V
4.99 V
0 V
4.99 V
4.99 V
4.99 V
4.99 V
0 V
−
−
+
+
−
−
+
+
1
1
5
5
10
10
15
15
20
20
25
25
30
30
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
SCL
SDA
AREF
GND
13
12
~11
~10
~9
8
7
~6
~5
4
~3
2
1
0
IOREF
RESET
3.3V
5V
GND
GND
VIN
A0
A1
A2
A3
A4
A5
DIGITAL (PWM ~)
POWER
ANALOG IN
UNO
ATMEGA328P
CH340G
U1 · Arduino UNO
U2 · KY-040
U1 · Arduino UNO
U2 · KY-040
2
2
4
4
6
6
8
8
10
10
12
12
13
13
14
14
15
15
16
16
f
f
g
g
j
j
MODEL · DC simulation
USB 44.9 mA
0 A
4.99 V
4.99 V
4.99 V
4.99 V
0 V
4.99 V
4.99 V
4.99 V
4.99 V
0 V
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