Silicon Laboratories Sensor-EXP-EVB User manual

Rev. 0.2 5/14 Copyright © 2014 by Silicon Laboratories Sensor EXP EVB UG
Sensor EXP EVB UG
Sensor EXP Evaluation Board USER’SGUIDE
1. Introduction
This Sensor-EXP-EVB is a hardware plugin card for the EFM32 starter kits (STKs). It contains the Si7013 humidity
and temperature sensor as well as the Si1147 UV and proximity sensor. A weather station software demo is
available to download to the Zero or Tiny Gecko STK through simplicity studio. When downloaded to the
EFM32ZG-STK3200 Zero Gecko STK or the EFM32TG-STK3300 Tiny Gecko STK, the demo displays humidity,
temperature, and UV index and performs gesture detection. Right or left gestures move the display type and, on
the temperature screen, up or down gestures move the display between °C or °F.
1.1. Features
Si7013 Humidity and Temperature sensor
Si1147 proximity sensor
3 IR LEDs for gesture detection
20-pin expansion header
Battery operation with long battery life
1.2. Getting Started
The first step to get started with your new Sensor-EXP-EVB is to go to www.silabs.com/simplicity-studio.
The simplicity studio software package contains all the tools, drivers, software examples and documentation
needed to use the Sensor-EXP-EVB.
You will need to connect the Sensor-EXP-EVB to the EFM32ZG-STK3200 Zero Gecko STK or the EFM32TG-
STK3300 Tiny Gecko STK. The demo code can be loaded using the USB cable and J-Link debug interface.

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2. Weather Station Demo
2.1. Loading the Demo
Connect the USB cable to the STK and launch Simplicity Studio. Click on “Detect connected device” then click on
the Demos button (top right) and select the Sensor-EXP weather station demo from the list. Make sure the Bat/Dbg
switch on the STK is set to DBG and click Start to download the demo. The following figures show the Zero Gecko
STK screens.
Figure 1. Simplicity Studio

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Figure 2. Device Detection


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Figure 3. Select Demos

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Figure 4. Demo Selection


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2.2. Using the Demo
After download, the USB cable can be disconnected and the demo will run from battery power by switching the
Bat/Dbg switch to battery.
The demonstration will first show a start screen with some basic instructions. In order to conserve power the
demonstration code wakes up every few seconds and looks for a proximity event before looking for gestures. To
initiate a proximity event, hold your hand (with fingers closed) over the Sensor-EXP-EVB. Once the proximity event
has been detected, gesture detection is enabled. The gesture control state is fairly high-power compared to the idle
state, so the code will automatically terminate gesture detection after one minute of inactivity. Swiping your hand
across the Sensor-EXP-EVB in left and right motions will change the display as shown in Figure 5.
Figure 5. Displays
While on the temperature display, an up or down swipe motion will change the units to °C or °F.
Humidity
(Si7013) UV Index (Si1147)
Temperature
(Si7013)

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3. Block Diagram
Figure 6. Sensor EXP Component Layout
Battery to
5V
converter
JP3
I2C
INTERFACE
All other lines
VMCU
(Battery)
5V
JP4
Si1147 UV
and
Proximity
sensor
Si7013
Humidity and
Temperature
sensor
LEDs

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4. EXP Hardware Layout
4.1. Sensor-EXP-Evaluation Board
Figure 7. Assembled Demo Platform
Si1147 UV and proximity
sensor
Si7013 Humidity and
Temperature sensor
IR LEDs I2C ribbon connector
EXP connector for EFM32 STK

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4.2. Sensor-EXP-EVB Connected to Zero Gecko STK
Figure 8. Sensor-EXP-EVB Connected to Zero Gecko STK
Hover hand to create a proximity event (Figure 9).
Figure 9. Hover Gesture
Swipe hand right or left to change display (Figure 10). Swipe up and down to change temperature display units.
Figure 10. Left/Right Swipe Gesture

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5. Connectors
On the left hand side of the board there is a right-angle 20-pin expansion header is to allow connection to the
EFM32 STK board. This connector is not currently compatible with Wonder, Giant, or Leopard Gecko STKs.
However, with hardware modifications, the sensor-EXP-EVB can be used with these STKs as well. On the right
hand side of the board there is another connector to allow connection to another plugin card. J6 is a flat ribbon
cable connector to connect other devices such as additional sensors to the I2C bus.
6. Schematics, Assembly Drawings and BOM
The schematics, assembly drawings and bill of materials (BOM) for the Sensor-EXP-EVB are available through
simplicity studio when the EXP documentation package has been installed.

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DOCUMENT CHANGE LIST
Revision 0.1 to Revision 0.2
Added Tiny Gecko.
Updated Figure 7 on page 8.
Updated Figure 8 on page 9.
Updated Figure 9 on page 9.
Updated Figure 10 on page 9.

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