Texas Instruments 2541SENSOR User Manual

SWRU324

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1. Kit Contents

SensorTag
1x CR2032 Battery
Documentation

The RF boards in this kit are FCC and IC
certified and tested/complies with ETSI/R&TTE
over temperature from 0 to +35°C1. The RF
board have integrated PCB antenna.

Caution! Dispose the battery properly and keep out of
reach of children. If swallowed, contact a physician
immediately.

Caution! The kit contains ESD sensitive
components. Handle with care to prevent

permanent damage.

2. Assembly of the SensorTag

Insert the battery2 in the battery connector and
place the printed circuit board in the black plastic
cover with the battery facing down.

Note that when inserting the battery for the first
time, the PCB contact point surface has a thin
layer of solder residue that may prevent contact
with the battery. Remove and insert the battery a
few times to power the SensorTag.

Push the side button to check if the battery is
correctly inserted. When the button is pushed the
LED marked D1 should start to blink.

Add the transparent plastic cover to close the
inner hard plastic pieces.

Complete the assembly of the SensorTag by
adding the red plastic cover.

3. Sensors

The SensorTag is fitted with six sensors and all
sensors are chosen to be small, energy efficient
and low cost surface mount devices. The
sensors use I2C interface and are connected to
the same interface bus with separate enable
signals. To minimize current consumption all
sensors are by default disabled and they are in
sleep mode between measurements. Each
sensor can be enabled and read individually. The
SensorTag includes the following sensors:

IR Temperature Sensor (TMP006) from

Texas Instruments,

http://www.ti.com/product/tmp006

Humidity Sensor (SHT21) from Sensirion,
http://www.sensirion.com/en/products/humidi

ty-temperature/humidity-sensor-sht21/

Pressure Sensor (T5400) from Epcos,

http://www.epcos.com/inf/57/ds/T5400.pdf

Accelerometer (KXTJ9) from Kionix,
http://www.kionix.com/accelerometers/kxtj9
Gyroscope (IMU-3000) from InvenSense,

http://www.invensense.com/mems/gyro/imu3

000.html

Magnetometer (MAG3110) from Freescale,

http://www.freescale.com/webapp/sps/site/pr

od_summary.jsp?code=MAG3110

4. Downloading the app from
App Store

The SensorTag can communicate with any
Bluetooth 4.0 enabled devices, for instance a
smart phone or a tablet.

Currently the TI Bluetooth SensorTag app is only
supported for Bluetooth 4.0 enabled iOS devices
(iPhone 4S, iPhone 5, iPod Touch and the new
iPad). There is currently no common Bluetooth
low energy Application Program Interface (API)
for Android devices available.

Download the TI Bluetooth SensorTag app from
Apple‟s App Store:

Or search for SensorTag on App Store.

5. Connecting to a Bluetooth 4.0
enabled iDevice

For a Bluetooth 4.0 iOS Device to communicate
with the SensorTag, Bluetooth needs to be
turned on and the SensorTag needs to be
advertising. The SensorTag can enable and
disable advertising by pushing the side button.
When the SensorTag is advertising the green
LED (D1) is blinking. It might be hard to see the
blinking LED when the SensorTag is fully
assembled.

Start the TI Bluetooth SensorTag app. When the
app is launched it will search for all Bluetooth low
energy devices in the area. Enable advertising by
clicking on the side button. The SensorTag icon
should appear indicating a successful
connection.

If no Bluetooth 4.0 devices are detected by the
SensorTag within 30 seconds, advertising will
stop and the SensorTag will go back to sleep. To
re-activate advertising and turning on the
SensorTag press the side button once more.

1
2

Side
Button

October 2012

Bluetooth SensorTag Quick Start Guide

Opening the Box and Using the SensorTag

The SensorTag simplifies development of Bluetooth low energy sensor applications. It allows app developers to quickly and easy write smart phone apps for
Bluetooth low energy accessories without any embedded hardware or software development.

www.ti.com/SensorTag

Operating temperature for CC2541 is -40 to 85C
Maximum input voltage is 3.6V

6. Use the SensorTag app

The TI Bluetooth SensorTag app allows you to
create your “own” app by selecting the different
sensors you want to use.

When connected to the SensorTag click on the
arrow next to the SensorTag symbol to get to the
sensor selection screen.

Select the different sensors by turning them „on‟.
Adjust the sensor data collection interval by
moving the sliding bars, and select which axis to
display for the multi-axis sensors. When you click
„Show application‟ the TI Bluetooth SensorTag
app will display the selected sensor data with
selected data interval.

To view and store the sample code of the
selected sensor configuration select „Store
sensor configuration‟.

Go back to „SensorTag device details‟ to select
another combination of sensor data to display.

Source code for the Bluetooth low energy
SensorTag app can be found at:

http://processors.wiki.ti.com/index.php/Bluetoot
h_SensorTag

7. Using the app as an attribute
and service explorer

In addition you can use the TI Bluetooth
SensorTag app to read the services and
attributes of any Bluetooth low energy enabled
device.

Connect the Bluetooth low energy device, and
make sure that the Bluetooth low energy device is
advertising prior to connecting.

When connected select the arrow next to the
device name and then select „Service

discovered’ and/or „Characteristics
discovered’ to view the services and

characteristics of the Bluetooth low energy
device.

Click on the arrow next to „Service discovered‟

and „Characteristics discovered‟ to display the

Services and Characteristics.

8. Using the SensorTag with TI’s
BLE Device Monitor

Download and install TI‟s BLE Device Monitor

from: www.ti.com/SensorTag. Please note that
you also need a CC2540 USB dongle to use the
BLE Device monitor.

The BLE Device Monitor allows you to discover,
read and alter attributes on any BLE device.
More detailed information about the BLE Device
Monitor can be found at:

www.ti.com/SensorTag

Note that BLE Device Monitor is currently only
supported on Windows 7/XP.

9. Supported platforms

To use the SensorTag a Bluetooth 4.0 device is
required and the API of the device must support
the Bluetooth low energy API. Currently the
following devices are supported:

iPhone 4S
iPhone 5
iPad (3)
iPod Touch (5th generation)
MacBook Air ( 2011 model and newer)
MacBook Pro (2012 model and newer)
Any Windows PC with CC2540 USB

dongle connected using BLE Device Monitor.

Part of TI BLE stack v1.30 and newer.

10. Next steps

1. Learn more about the SensorTag and the BLE
Device Monitor at:

www.ti.com/SensorTag

2. Download the TI Bluetooth low energy stack at:

http://www.ti.com/tool/ble-stack

3. Meet other Bluetooth low energy developers
and get technical support at:

http://e2e.ti.com/support/low_power_rf/f/538.aspx

Electronic version of the quick start guide, got to: http://www.ti.com/lit/swru324
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