Silicon Laboratories SENSOR PUCK Manuale utente

Sensor Puck

SENSOR PUCK USER’SGUIDE

1. Introduction

The sensor puck demonstrates Silicon Laboratories optical sensor (Si1147-M01) RH and temperature sensor

(Si7021) and low power MCU (EFM32G210 “Gecko”). The data is broadcast using a Bluetooth Low Energy (BLE)

module and can be displayed on a mobile device (Apple iOS or Android) that supports the BLE protocol.

By using broadcast mode, a connection does not have to be established, making it possible to display the data

from several modules at the same time.

2. Evaluation Kit Description

Figure 1. Silicon Labs Sensor Puck

The evaluation kit consists of a sensor puck with a battery and the on/off switch in the off position. Install the battery

if it is not installed. The + terminal of the battery faces away from the board towards the + terminal of the battery

holder. Remove the pull tab separating the battery from the battery holder if needed. When the switch is turned on,

the puck will automatically start taking and broadcasting data. For the puck itself, there is no installation required.

Sensor Puck

2 Rev. 1.0

The data that is broadcast is generally displayed on a mobile device. To display the data the Silicon Labs Sensor

Puck app must be installed on the mobile device. The application is available for no charge from the Apple App

Store or the Google Play Store. (Search for Silicon Labs Sensor Puck.)

3. Operation

Environmental mode

Measures ambient light, UV index, ambient temperature, and ambient humidity.

This is the default mode of operation and the lowest power.

In this mode of operation measurements are taken and broadcast (once per second).

The LED flashes green once per measurement cycle.

The battery current consumption in this mode is approximately 1.5 mA average, which means that a standard CR2032

battery will last about five days. The battery for this demo is not rechargeable so it must be replaced if it is depleted.

Biometric mode

At the once per second interval for environmental monitoring, the puck checks for the presence of an object over the

Si1147-M01 (under the acrylic cover).

If an object is detected the puck will go into biometric mode and attempt to measure heart rate.

Heart rate is measured by the reflection of IR light from an LED inside the Si1147-M01.

The light is reflected from a finger-tip to measure the heart rate.

In biometric mode the power consumption goes up to 7 mA, so battery life will decrease to about one day in this mode.

In biometric mode, the LED will flash red while it is acquiring the heartbeat and then switches to continuous green once

the heartbeat has been acquired.

To avoid excessive power drain in case the puck is left on and covered with an object, the puck will exit biometric mode

after 90 seconds. In this case, the object must be removed and a finger should be placed over the acrylic cover to start

biometric monitoring again.

The data from the puck is broadcast over a BLE “advertisement” packet. The mobile device that displays the data does

not need to make a connection to the puck. For this reason, it possible that a single mobile device (i.e. a phone) can

display data from multiple pucks.

Sensor Puck

Rev. 1.0 3

4. Sensor Puck Applications

There is a Sensor Puck app for iOS devices and another Sensor Puck app for Android devices. Both apps are

named “Silicon Labs Sensor Puck”.

The iOS Sensor Puck app can be installed from the Apple App Store. The iOS app runs on devices with iOS 7 and

higher, and has Bluetooth 4.0 hardware. Silicon Labs has verified that the iOS app runs on iPhone 4S, 5, 5S, 6 and

6 Plus. The iOS app also runs on iPad 3 and 4.

The Android Sensor Puck app can be installed from the Google Play Store. The Android app runs on devices with

Android version 4.3 and higher, and has Bluetooth 4.0 hardware. Silicon Labs has verified that the Android app

runs on the following devices: Samsung Galaxy S4, Samsung Galasy S5, Samsung Galaxy Tab 3, Motorola

Moto E, Motorola Moto G, HTC Desire, HTC One Max, LG Nexus 5, LG G Flex, Sony Z1, Sony T2 Ultra, and Asus

Nexus 7.

When the puck is in environmental mode, the Silicon Labs Sensor Puck app displays the environmental screen:

Figure 2. Android Environmental Screen

Sensor Puck

4 Rev. 1.0

The environmental screen displays the environmental sensor measurements and the battery status. The puck

name is displayed at the top of the screen. The temperature scale can be changed between Celsius and

Fahrenheit by tapping the small C and F buttons.

When the puck is in biometric mode, the Android Sensor Puck displays the biometric screen.

Figure 3. Android Biometric Screen

Sensor Puck

Rev. 1.0 5

The iOS Sensor Puck app does not have a biometric screen. The iOS app displays the heart rate in the lower right

corner of the environmental screen:

Figure 4. iOS Environmental Screen

Sensor Puck

6 Rev. 1.0

If there are several sensor pucks, you can use the navigation drawer to select a different puck. To open the

navigation drawer, tap on the three-line icon in the upper left corner of the screen or swipe from the left edge of the

screen.

Figure 5. Navigation Drawer

Sensor Puck

Rev. 1.0 7

You can change the name of a puck by tapping on the edit icon to the right of the puck name.

Figure 6. Puck Name

Sensor Puck

8 Rev. 1.0

5. Sensor Puck Hardware Description

5.1. Schematics

Figure 7 shows the block diagram of the puck with debug header MCU, the sensors, and the Bluetooth module.

Figure 7. Block Diagram

Figure 8 shows the power section. The CR2032 battery is used to power most of the ICs. A boost converter is used

to produce 4.1 V which is used to power the LED of the Si1147 so it can be driven at higher current than is possible

with a coin cell battery.

Figure 8. Power Section

Figure 9 shows the EFM32G210 “Gecko” MCU. The 24 MHz clock is only used in active periods. For lower power

consumption, the internal 32 KHz R-C clock is used as much as possible. A special calibration routine is used to

calibrate the 32 KHz clock against the 24 MHz crystal for accuracy in the UART communication speed while in low

power mode.

Debug pins

VMCU

BLE

05-BLE

BLE_TX

BLE_RX

BLE_WAKE

HOST_WAKE

BLE_RESET

TP2

GND

Pulse

03-Pulse

SDA

SCL

INT

LEDs

07-LEDs

RED

GREEN

HEADER 2x5/SM

122

344

566

788

910 10

MCU

02-MCU

BLE_WAKE

RESET

I2C0_SDA

I2C0_SCL

LEU0_TX

LEU0_RX

SWDIO PF1

SWCLK PF0

SWO PF2

INT

RED

GREEN

HOST_WAKE

BLE_RESET

RHT

04-RHT

SDA

SCL

high = 4.1V low = 5.0V

Debug

VMCU

+5V

C11

0.1uF

C12

47uF

U4 TS3310

4STORE 9

VGOOD 6

OUT_ON

LSW 8

OUT 10

EPAD

11 GND

47uH

SW1

SW_SLIDE_2POS

C13

47uF

R11

BH1

20mm BATTERY HOLDER

POS 1

POS 3

NEG 2

Sensor Puck

Rev. 1.0 9

Figure 9. EFM32G210 MCU

Figure 10 shows the Si7021 RH and temperature sensor as well as the Si1147-M01 optical sensor.

Figure 10. Sensors

Figure 11 shows the BLE module and LEDs.

Connect together then

connect tp power plane

Connect together then

connect tp power plane

DBG_SWCLK

DBG_SWDIO

DBG_SWO

SWDIO PF1

INT

SWO PF2

SWCLK PF0

GREEN

RED

LEU0_TX

LEU0_RX

BLE_WAKE

RESET

HOST_WAKE I2C0_SDA

I2C0_SCL

BLE_RESET

VMCU

C5 0.1uF

C2 0.1uF

R8 4.99K

10pF

R10 4.99K

C4 0.1uF

C10

10pF

R9 4.99K

C3 0.1uF

EFM32G210

PA0

PA1

PA2

IOVDD 4

PC0

PC1

PB7

PB8

PC15 24

PC14 23

PC13 22

DEC 21

VDD_DREG 20

PD7 19

PD6 18

PD5 17

PE13 32

PE12 31

PE11 30

PE10 29

IOVDD 28

PF2 27

PF1 26

PF0 25

NRST

PB11

AVDD 11

PB13

PB14

IOVDD 14

AVDD 15

PD4 16

VSS/EPAD

1.0uF

10uF

C6 0.1uF

24MHz

XTAL1

GND

2XTAL2 3

GND 4

SDA

SCL

VMCU

C17

0.1uF

Si7021

GND

2VDD 5

SCL

SDA

1NC 3

NC 4

SDA

SCL

INT

+5V

VMCU

2SWLFDO Sensor

LED2 6

LED3 7

GND 8

LED1 9

LEDA 10

DNC

1SDA

2SCL

3VDD

4INT#

C16

0.1uF

Sensor Puck

10 Rev. 1.0

Figure 11. BLE Module and LEDs

5.2. Bill of Materials

Table 1. Sensor Puck BOM

Quantity Reference Value Voltage Tol Manufacturer

Part Number Manufacturer

1 BH1 20 mm BATTERY

HOLDER BAT-HLD-001 LINX TECHNOLO-

GIES INC.

1 C1 0.1 µF 16 V ±10% C0402X7R160-

104K Venkel

8 C2,C3,C4,C5,C6,C11

, C16,C17 0.1 µF 10 V ±10% C0402X7R100-

104K Venkel

1 C7 10 µF 6.3 V ±20% C0603X5R6R3-

106M Venkel

1 C8 1.0 µF 6.3 V ±10% C0402X5R6R3-

105K Venkel

2 C9,C10 10 pF 50 V ±5% C0402C0G500-

100J Venkel

2 C12,C13 47 µF 6.3 V ±20% C0805X5R6R3-

476M Venkel

1 D1 598-8410-207CF 598-8410-207CF Dialight

1 J1 Header 2x5 TH M50-3500542 Harwin

1 L1 47 µH ±20% NR 3012T 470M Taiyo Yuden

3 R3,R4,R5 10 K ±1% CR0402-16W-

1002F Venkel

3 R8,R9,R10 4.99 K ±1% CR0402-16W-

4991F Venkel

RED

GREEN

VMCU

598-8410-207CF

R14

R13

BLE_TX

BLE_RX

BLE_WAKE

HOST_WAKE

BLE_RESET

VMCU

BCM20732i

BLUETOOTH LE

BCM20732i

DNC 1

GND

VBAT 3

GND

RSTb

WAKE MODULE

SCL

SDA

EEPROMWP

HOST UART_TX

PRGM UART_TX

19 Prgm UART_RX

GND

DNC 10

GND

DNC 44

DNC 43

DNC 42

DNC 37

DNC 34

DNC 33

DNC 32

DNC 31

DNC 30

DNC 26

WAKE HOST

RESET

HOST UART_RX

TPV1

TPV6

TPV5

R4 10K

TPV2

0.1uF

R5 10K

R3 10K

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