www.espressif.com

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 cm. 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

!

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

ESP3

2-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 10

10

10

010

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

I2C

ADDR

: 0x0

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Espressif ! /87 2018.10

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