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ESP32-Azure IoT Kit Hardware Design Guide
Version 1.0 Espressif Systems Copyright © 2018
About This Guide The ESP32-Azure IoT Kit Hardware Design Guidelines introduces the block diagram, PCB layout and function modules of the development board ESP32-Azure IoT Kit.
Release Notes
Documentation Change Notification Espressif provides email notifications to keep customers updated on changes to technical documentation. Please subscribe at https://www.espressif.com/en/subscribe.
Certification Download certificates for Espressif products from https://www.espressif.com/en/certificates.
Date Version Release notes
2018.10 V1.0 Initial release.
Table of Contents 1. Block Diagram 1 .......................................................................................................................
2. System Component 2 ...............................................................................................................2.1. MCU 2...........................................................................................................................................
2.2. Sensor 2........................................................................................................................................2.3. USB-to-UART Bridge 3.................................................................................................................2.4. Power Supply 3.............................................................................................................................2.5. Expanded Interface 3....................................................................................................................2.6. OLED Display 3.............................................................................................................................2.7. Tactile Button, Buzzer and LED Display 3.....................................................................................
3. PCB Design 4 ............................................................................................................................3.1. Product Image 4............................................................................................................................3.2. PCB Layout 5................................................................................................................................
4. Schematic 6..............................................................................................................................
!
1. Block Diagram
1. Block Diagram The block diagram below illustrates the main components of the ESP32-Azure IoT Kit and their interconnections.
!
SW1
TXD DM
USB CONN
VBUS
Signal
Power
I2C SCL
I2C SDA
Motion Barometer H&T
RST
RXD
MagmeterLight
DP
BAT CONN
USB Bridge
Pin Headers/Grove
Screen
BOOT
EN
MicroSD Card
ChargeIC
DCDCstep dn
ESP32 WROVER
BZ
Espressif ! /81 2018.10
!
2. System Component
2. System Component 2.1. MCU
The ESP32-Azure IoT Kit is a development board built around the ESP32 chip, which is a single 2.4 GHz Wi-Fi-and-Bluetooth combo chip designed with the TSMC ultra-low-power 40 nm technology. It is designed to achieve the best power and RF performance, showing robustness, versatility and reliability in a wide variety of applications and power scenarios.
2.2. Sensor
Component Model Manufacturer Description
Motion Sensor MPU6050 InvenSense
• Digital-output X-, Y-, and Z-Axis angular rate sensors
• Digital-output triple-axis accelerometer ( ±2 g/±4 g/±8 g/±16 g)
• Integrated 16-bit ADCs enable simultaneous sampling
• Digitally-programmable low-pass filter
• Orientation detection and signaling
Magnetometer MAG3110 NXP
• Sensitivity of 0.10 uT
• Noise down to 0.25 uT rms
• Output Data Rates (ODR) up to 80 Hz
Barometer FBM320 Formosa
• 300 to 1100 hPa pressure range
• 8 cm altitude resolution (RMS)
• 8 ms pressure conversion time
Sensor (Humidity and Temperature) HTS221 ST
• 0 to 100% relative humidity range
• Humidity accuracy: ± 3.5% rH, 20 to +80% rH
• High rH sensitivity: 0.004% rH/LSB
• Temperature accuracy: ± 0.5 °C,15 to +40 °C
• Selectable ODR from 1 Hz to 12.5 Hz
• Embedded 16-bit ADC
Sensor (Light) BH1750FVI ROHM
• Illuminance to Digital Converter
• Wide range and High resolution (1 - 65535 lx)
• Small measurement variation (± 20%)
Espressif ! /82 2018.10
!
2. System Component
2.3. USB-to-UART Bridge The USB-to-UART Bridge used in the ESP32-Azure IoT Kit is CP2102 USB from Silicon Labs, which supports up to 1 M serial port communication and enables the auto switching between ESP32 boot modes.
2.4. Power Supply Both USB power and lithium battery can be used to power up the board. When the USB power is used, the power supply circuit to the lithium battery is cut off automatically. The step-down DC-DC converter used in the board has a ultra-low quiescent current, which ensures the board can achieve ultra-low power consumption during deep-sleep.
Besides, there is also a charge management IC on the board, so the USB port can also be used to charge the lithium battery.
2.5. Expanded Interface The board has 16 through-hole testing points (2.54 mm pitch) to lead out the system power and available module IOs, which can be used to connect pin headers and grove connectors.
Besides, there is also a MicroSD slot on the board, which can be used to connect microSD card by SPI bus.
2.6. OLED Display A 0.96” blue and yellow OLED display is installed on the board, which integrates a SSD1306 driver chip and supports communication through I2C bus.
2.7. Tactile Button, Buzzer and LED Display • 1 x system RESET button
• 1 x user-defined button, which can be used to switch between ESP32 boot modes
• 2 x LED indicators, which can be used to indicate if the board has successfully connected to Wi-Fi network or Azure Cloud
• 1 x passive buzzer, which can be used to provide audio feedback
Espressif ! /83 2018.10
!
3. PCB Design
3. PCB Design A four-layer PCB design is used for the ESP32-Azure IoT Kit. The dimension of board is 54 x 75 mm. The draft PCB design can be seen in this section.
3.1. Product Image
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Espressif ! /84 2018.10
!
3. PCB Design
3.2. PCB Layout
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J4
1 30
RF A
nten
na
YMotion
X
Azure
WiFi
-
+
CHRGSDBY
KEY_EN KEY_IO0
3V3
IO5
IO12
IO13
IO14
IO15
GND
IO18
IO19
IO21
IO22
IO23
IO35
IO36
IO39
GND
ESP32-AZURE-KIT2018-9-28
V0.8
C1C1
4
C19
C2
C20C21
C22
C23
C24
C25C26
C27C28
C29
C3
C30
C31C32
C33
C34
C4
C5C6
C7
C8
C9
D1
D12
D13
D2D3
D4
D5D6
D7
J1
J2
J3
J5
L1
Q1
Q2
Q3
Q4
Q5
Q6
Q7
R1 R10
R11
R12
R15
R16
R17
R18
R19
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R4
R5
R6
R7
R8
R9
SW1SW2
U1
U10
U11
U12
U2
U3
U6
U8
U9
BZ1
R40
R41D14
Q8
C16
C36
C37
C38
C39
C40
C41
C42
D10
D11
D8
D9
R2
R20
R21
R22
R24
R3
R38
R39
J4C16
C36 C37 C38 C39 C40 C41 C42
D10
D11
D8
D9
R2
R20
R21
R22
R24
R3
R38 R39
J5
C1C14
C19
C2
C20C21
C22
C23
C24
C25C26
C27
C28
C29
C3
C30
C31C32
C33
C34
C4
C5C6
C7
C8C9
D1
D12
D13
D2D3
D4
D5D6
D7J2
J3L1
Q1
Q2Q3Q4
Q5Q6
Q7
R1 R10
R11
R12
R15
R16R17R18 R19
R27R28
R29
R30
R31
R32
R33R34
R35 R36R37
R4
R5R6
R7R8
R9
SW1SW2
U1U10
U11
U12
U2U3
U6U8
U9 BZ1
R40
R41
D14Q8J4J4x1J4x2J4
x3J4x4J4x5
J4x6J4x7J4
x8J4x9 J4x10 J4x11
J4x12
J4x13J4x1
4J4x1
5
J5J5x1
J5x2
J5x3
J5x4
J5x5
J5x6
J5x7
J5x8
J5x9
J5x10
J5x11
J5x12
J5x13
J5x14
J5x15
J5x16
C16C16x1
C16x2
C36C36x1C36x2 C37C37x1C37x2 C38C38x1C38x2 C39C39x1C39x2 C40C40x1C40x2 C41C41x1C41x2 C42C42x1C42x2
D10D10x1D10x2
D11D11x1D11x2
D8D8x1D8x2
D9D9x1D9x2
J1J1x6J1x7
J1x8J1x9
R2R2x1
R2x2
R20R20x1
R20x2
R21R21x1
R21x2
R22R22x1
R22x2
R24R24x1
R24x2
R3R3x1
R3x2
R38R38x1R38x2 R39R39x1R39x2 J4J4x14
J4x15
J5J5x1
J5x2
J5x3
J5x4
J5x5
J5x6
J5x7
J5x8
J5x9
J5x10
J5x11
J5x12
J5x13
J5x14
J5x15
J5x16
C1C1x1C1x2
C14C14x1C14x2
C19C19x1C19x2
C2C2x1C2x2
C20C20x1
C20x2
C21C21x1
C21x2
C22C22x1C22x2
C23C23x1
C23x2
C24C24x1
C24x2
C25C25x1
C25x2
C26C26x1
C26x2
C27C27x1
C27x2
C28C28x1
C28x2
C29C29x1
C29x2
C3C3x1C3x2
C30C30x1
C30x2
C31C31x1
C31x2
C32C32x1
C32x2
C33C33x1
C33x2
C34C34x1
C34x2
C4C4x1C4x2
C5C5x1C5x2C6C6x1C6x2
C7C7x1
C7x2
C8C8x1C8x2
C9C9x1
C9x2
D1D1x1 D1x2
D12D12x1
D12x2
D13D13x1
D13x2
D2D2x1
D2x2
D3D3x1
D3x2
D4D4x1D4x2
D5D5x1D5x2
D6D6x1D6x2
D7
D7x1
D7x2
J1J1x1J1x2J1x3
J1x4J1x5
J1x6J1x7
J1x8J1x9
J2J2x1J2x2 J2x3J2x4
J3J3x1
J3x2
J3x3
J3x4
J3x5
J3x6
J3x7
J3x8
J3x9
J3x10
J3x11
J3x12
J3x13
J3x14
J3x15
J3x16
J3x17
J3x18
J3x19
J3x20
J3x21
J3x22
J3x23
J3x24
J3x25
J3x26
J3x27
J3x28
J3x29
J3x30
L1L1x1L1x2
Q1
Q1x1
Q1x2
Q1x3
Q2
Q2x1
Q2x2
Q2x3
Q3
Q3x1
Q3x2
Q3x3
Q4
Q4x1
Q4x2
Q4x3
Q5Q5x1
Q5x2
Q5x3
Q6Q6x1
Q6x2
Q6x3
Q7
Q7x1
Q7x2
Q7x3
R1R1x1R1x2 R10R10x1R10x2
R11R11x1R11x2
R12R12x1R12x2
R15R15x1R15x2
R16R16x1R16x2
R17R17x1R17x2R18R18x1R18x2 R19R19x1R19x2
R27R27x1R27x2R28R28x1R28x2
R29R29x1
R29x2
R30R30x1
R30x2
R31R31x1
R31x2
R32R32x1
R32x2
R33R33x1R33x2R34R34x1R34x2
R35R35x1R35x2 R36R36x1R36x2 R37R37x1R37x2
R4R4x1R4x2
R5R5x1
R5x2 R6R6x1R6x2
R7R7x1R7x2R8R8x1R8x2
R9R9x1R9x2
SW1SW1x1SW1x2
SW1x3SW1x4SW2SW2x1SW2x2
SW2x3SW2x4
U1U1
x1U1
x2U1
x3U1
x4U1
x5U1
x6U1
x7U1
x8U1
x9U1
x10
U1x11
U1x12
U1x13
U1x14
U1x15
U1x16
U1x17
U1x18
U1x19
U1x20
U1x21
U1x22
U1x23
U1x24
U1x25
U1x26
U1x27
U1x28
U1x29
U1x30
U1x31
U1x32
U1x33
U1x34
U1x35
U1x36
U1x37
U1x38
U1x39
U10U10x1U10x2U1
0x3U10x4U10x5U10x6
U11U11x1U11x2U11x3U11x4U11x5U11x6U11x7U11x8U11x9U11x10
U12U12x1U12x2U12x3
U12x4
U12x5
U12x6
U2U2x1U2x2
U2x3U2x4 U2x5
U2x6U2x7
U2x8U2
x9
U3U3x1U3x2
U3x3 U3x4U3x5
U6U6x1U6x2U6x3
U6x4U6x5U6x6
U6x7U6x8
U6x9
U6x10
U6x11
U6x12
U6x13
U6x14
U6x15U6x16U6x17U6x18U6x19U6x20U6x21U6x22
U6x23
U6x24
U6x25
U6x26
U6x27
U6x28U6x2
9
U8U8x1U8x2U8
x3U8x4U8x5
U8x6U8x7
U8x8
U8x9
U8x10
U8x11
U8x12
U8x13U8x14U8x15U8x16U8x17U8x18U8
x19
U8x20
U8x21
U8x22
U8x23
U8x24
U9U9x1
U9x2
U9x3
U9x4
U9x5
U9x6
U9x7
U9x8 BZ1BZ1x1BZ1x2
BZ1x3
R40R40x1R40x2
R41R41x1
R41x2
D14D14x1D14x2Q8Q8x1
Q8x2
Q8x3
TP1TP1x1
TP10TP10x1
TP2TP2x1TP3TP3x1TP4TP4x1TP5TP5x1TP6TP6x1TP7TP7x1TP8TP8x1TP9TP9x1
ESP32 Module
OLED ScreenMotion Sensor
MagnetometerLight Sensor
BarometerH&T Sensor
Key x 2
Pin Headers /Grove
Buzzer
Customer LED X 2
SD Card SlotUSB-to-UART BridgeUSB Micro-B
Charge LED x 2
Battery Connector
Espressif ! /85 2018.10
!
4. Schematic
4. Schematic
!
5 5
4 4
3 3
2 2
1 1
DD
CC
BB
AA
ESP
32-W
RO
VE
R
USB
2UA
RT
Pow
er a
nd B
atte
ry C
harg
e
Vout
=1.1
3*(1
+R6/
R11
)=3.
39V
Iset
= 5
00m
A (
R4
= 2K
)
Boo
t Mod
eD
TR
RT
SE
NIO
0
11
11
10
1 1
01
01
00
10
Flas
h B
oot
Syst
em D
own
UA
RT
0 B
oot
Flas
h B
oot
IO2 1 1 10
IO C
onne
ctor
s
BA
T+B
AT-
ES
P_R
XD
ES
P_T
XD
PIN
15
KE
Y_I
O0
LED
_WIF
ILE
D_A
ZUR
E
ES
P_E
N
CP
_DTR
CP
_RTS
US
B_D
P
CP
_TX
DC
P_R
XD
US
B_D
M
CP
_RTS
CP
_DTR
ES
P_E
N
CP
_RTS
CP
_DTR
KE
Y_I
O0
IO2
CP
_DTR
CP
_RTS
CP
_TX
DE
SP
_RX
DC
P_R
XD
ES
P_T
XD
US
B_D
M
SD
_CLK
SD
_DI
SD
_CS
SD
_DO
I2C
0_S
CL
I2C
0_S
DA
PE
RI_
PW
R
PE
RI_
PW
R
BA
T_A
DC
BA
T_A
DC
IO5
IO12
IO18
IO19
IO21
IO22
IO23
IO35
IO36
IO39
ES
P_E
N
SD
_DO
IO2
IO35
IO36
IO39
I2C
0_S
CL
I2C
0_S
DA
BU
Z_IO
27
IO18
IO19
IO21
IO22
IO23
IO5
IO12
IO13
IO14
IO15
SD
_CS
IO13
SD
_CLK
IO14
SD
_DI
IO15
US
B_D
PS
D_C
SP
IN16
SD
_DI
PIN
23
PIN
19P
IN20
PIN
21P
IN22
PIN
18P
IN17
PIN
15P
IN16
PIN
17P
IN18
PIN
19
PIN
22P
IN21
PIN
20
PIN
23P
IN24
SD
_DO
PIN
24
VB
AT
VB
US
_A
VB
AT
VD
D3V
3
VD
D3V
3V
BU
S_A
VB
AT
VS
YS
VB
US
VB
US
_AV
BU
S_A
VS
YS
VD
D3V
3_A
VD
D3V
3_A
VB
US
_A
VB
US
_A
VD
D3V
3_A
VD
D3V
3V
DD
3V3_
A
VB
AT
VD
D3V
3
LED
_WIF
ILE
D_A
ZUR
E
SD
_CS
SD
_CLK
SD
_DI
SD
_DO
KE
Y_I
O0
ES
P_E
N
I2C
0_S
CL
I2C
0_S
DA
BU
Z_IO
27
R8
100K
/1%
R6
2M/1
%
TP8
1
J5 CO
N16
-XH
-2P
54
11
22
33
44
55
66
77
88
99
1010
1111
1212
1313
1414
1515
1616
TP4
1
U2
AP
5056
TEM
P1
PR
OG
2
GN
D3
VC
C4
BA
T5
STD
BY
6C
HR
G7
CE
8
PG
ND
9
Q3
S80
50
Q2
S80
50
U6
CP
2102
DC
D1
RI
2
GN
D3
D+
4
D-
5
VD
D6
RE
GIN
7
VBUS8
RST9
NC110
SUSPEND11
SUSPEND12
NC213
NC314
NC
415
NC
516
NC
617
NC
718
NC
819
NC
920
NC
1021
NC1122 CTS23 RTS24 RXD25 TXD26 DSR27 DTR28 PGND29
D2
RE
D L
ED
H3
Hol
e_M
31
C4
0.1u
F/10
V
R2
2K/1
%
C14
0.1u
F/10
V
R11
1M/1
%
R9
10K
/1%
TP2
1
Q7
AO
3401
D7
BA
T60A
D3
YLW
-GR
N L
ED
R16
10K
/1%
R15
10K
/1%
U3
ETA
3425
IN4
GND2
EN
1FB
5
LX3
TP7
1
R5
10K
/1%
C7
10uF
/10V
R37
1M/1
%
R17
0R/1
%
Q4
S80
50
R4
2K/1
%
J2
CO
N2-
PH
-SM
4S
1 2C
9
0.1u
F/10
V
TP10
1
TP5
1
D1
BA
T60A
TP1
1
H1
Hol
e_M
31
D5
LES
D5D
5.0C
T1G
U1
ES
P32
-WR
OV
ER
3V3
2
IO36
4
IO39
5
IO34
6
IO35
7
IO32
8
IO33
9
IO25
10
IO26
11
IO27
12
IO14
13IO
1214
IO23
37IO
2236
TXD
035
RX
D0
34
IO21
33IO
1931
IO18
30
IO5
29
SD
217
IO4
26
IO13
16
CLK
20
SD
021
SD
122
IO15
23
IO2
24
EN
3
CM
D19
SD
318
GN
D1
GN
D15
GN
D38
PG
ND
39
NC
228
NC
127
NC
32
IO0
25C
122
uF/1
0V
C2
10uF
/10V
TP3
1
R1
10K
/1%
R7
10K
/1%
TP9
1
R12
10K
/1%
Q1
AO
3401
H4
Hol
e_M
31
D6
LES
D5D
5.0C
T1G
D4
LES
D5D
5.0C
T1G
R3
2K/1
%
C5
10uF
/10V
J1U
SB
-MIC
RO
-B
VB
US
1
GN
D5
MT10
MT11
D-
2
D+
3
ID4
GN
D6
GN
D7
GN
D8
GN
D9
R36
2M/1
%
C3
10uF
/10V
TP6
1
C6
0.1u
F/10
V
R35
100K
/1%
R19
47.5
K/1
%(N
C)
R18
2K/1
%
C8
0.1u
F/10
V
L1 2.2u
H/2
.6A
R10
10K
/1%
H2
Hol
e_M
31
Espressif ! /86 2018.10
!
4. Schematic
�
5 5
4 4
3 3
2 2
1 1
DD
CC
BB
AA
Mic
roSD
Car
d
Sens
ors
I2C
Mod
e, I2
C Ad
dres
s: 0
x6D
Baro
met
er
Hum
idity
and
tem
pera
ture
sen
sor
Ambi
ent l
ight
sens
or
I2C
Mod
e, I2
C Ad
dres
s: 0
x5F
I2C
Mod
e, I2
C Ad
dres
s: 0
x23
I2C
ADD
R: 0
x68
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Espressif ! /87 2018.10
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