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Appendix A
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5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
6-
Ph
ys
ic
al
-B
ut
to
ns
:
Co
nn
ec
to
r
fo
r
LE
D
&
Bu
tt
on
&
M
IC
(R
es
er
ve
d)
:
0.6V
MIC
MUTE
1.8V
2.42
V
1.2V
VOL+
PLAY/P
AU
S
E
VOL-
I2
C_
SCL
:
I
O
2
3
I2
C_
SDA
:
I
O
1
8
Bu
tt
on
Ar
ra
y
MU
TE
_O
N_O
F
F
:
I
O
2
7
IO18 IO23
S
E
NS
O
R_V
N
CX
_MICB
IA
S
1
CX
_MICB
IA
S
2
E
xtFF
C_M
IC_INN
1
E
xtFF
C_M
IC_INP
1
E
xtFF
C_M
IC_INP
2
E
xtFF
C_M
IC_INN
2
IO27
S
E
NS
O
R_V
N
S
E
NS
O
R_V
N
IO23 IO18
CX
_MICB
IA
S
1
CX
_MICB
IA
S
2
E
xtFF
C_M
IC_INP
1
E
xtFF
C_M
IC_INN
1
E
xtFF
C_M
IC_INP
2
E
xtFF
C_M
IC_INN
2
IO27
CX
_GN
D
LED
_VC
C
CX
_GN
D
V
CC
CX
_GN
D
CX
_GN
D
CX
_GN
D
G
ND
V
DD
33
G
ND
G
ND
G
ND
G
ND
S
E
NS
O
R_V
N
2
IO23
2,5
,6
IO18
2,5
,6
CX
_MICB
IA
S
1
5
CX
_MICB
IA
S
2
5
E
xtFF
C_M
IC_INP
1
5
E
xtFF
C_M
IC_INN
1
5
E
xtFF
C_M
IC_INP
2
5
E
xtFF
C_M
IC_INN
2
5
IO27
2,5
Ti
tle
Size
Doc
umen
t
Numb
er
Re
v
Da
te
:
Sh
e
e
t
of
<03_
B
utt
on
&
Conne
cto
r>
1.3
ESP32-
LYR
ATD-SYN
A
C
3
6
F
rid
ay
, Augus
t 3
0,
20
19
Ti
tle
Size
Doc
umen
t
Numb
er
Re
v
Da
te
:
Sh
e
e
t
of
<03_
B
utt
on
&
Conne
cto
r>
1.3
ESP32-
LYR
ATD-SYN
A
C
3
6
F
rid
ay
, Augus
t 3
0,
20
19
Ti
tle
Size
Doc
umen
t
Numb
er
Re
v
Da
te
:
Sh
e
e
t
of
<03_
B
utt
on
&
Conne
cto
r>
1.3
ESP32-
LYR
ATD-SYN
A
C
3
6
F
rid
ay
, Augus
t 3
0,
20
19
R40
2.2
K
(1
%)
C137
0.1
uF/16V(10
%)
S3
S
W_R
1
1
2
2
3
3
4
4
S4
S
W_R
1
1
2
2
3
3
4
4
D19 LES
D5D
5.0
CT
1G
J1
3
A
F
C01-S16FC
A
-0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
S1
S
W_R
1
1
2
2
3
3
4
4
S2
S
W_R
1
1
2
2
3
3
4
4
R39
5.7
6K(1%)
R37
12
K
(1
%)
C17
10
nF/50V(10
%)
R30
10
K
(5
%)
R276
0R(5%)
R32
27
.4K(1%)
C138
10
uF/16V(20
%)
Espressif
!
/
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13 17
2019.09