−
−
+
+
1
5
10
15
20
25
30
35
t
t
s
s
r
r
q
q
p
p
o
o
n
n
m
m
l
l
k
k
−
−
+
+
1
5
10
15
20
25
30
35
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
EN
VP
VN
D34
D35
D32
D33
D25
D26
D27
D14
D12
D13
GND
VIN
3V3
GND
D15
D2
D4
RX2
TX2
D5
D18
D19
D21
RX0
TX0
D22
D23
ESP32
WROOM-32
CP2102
R1 · 1 kΩ
R2 · 2 kΩ
U1 · ESP32 DevKit
U2 · HC-SR04
R1 · 1 kΩ
R2 · 2 kΩ
U1 · ESP32 DevKit
U2 · HC-SR04
2
2
6
6
10
10
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
f
f
h
h
j
j
p
p
q
q
r
r
s
s
t
t
MODEL · DC simulation
33 nA
33 nA
USB 47 mA
VCC 2 mA
0 V
0 V
0 V
3.3 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
4.99 V
3.3 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
4.99 V
0 V
0 V
0 V
0 V
0 V
−
−
+
+
1
5
10
15
20
25
30
35
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
−
−
+
+
1
5
10
15
20
25
30
35
t
t
s
s
r
r
q
q
p
p
o
o
n
n
m
m
l
l
k
k
T
VCC
TRIG
ECHO
GND
HC-SR04
EN
VP
VN
D34
D35
D32
D33
D25
D26
D27
D14
D12
D13
GND
VIN
3V3
GND
D15
D2
D4
RX2
TX2
D5
D18
D19
D21
RX0
TX0
D22
D23
CP2102
ESP32
WROOM-32
R
U2 · HC-SR04
U1 · ESP32 DevKit
R1 · 1 kΩ
R2 · 2 kΩ
R1 · 1 kΩ
R2 · 2 kΩ
U1 · ESP32 DevKit
U2 · HC-SR04
2
2
6
6
10
10
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
f
f
h
h
j
j
p
p
q
q
r
r
s
s
t
t
MODEL · DC simulation
33 nA
33 nA
USB 47 mA
VCC 2 mA
0 V
0 V
0 V
3.3 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
4.99 V
3.3 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
4.99 V
0 V
0 V
0 V
0 V
0 V
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