Sensixa EARL1 ear worn Activity Recognition Sensor User Manual

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Document ID	1625239
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Document Description	User Manual
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Document Type	User Manual
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Filesize	26.78kB (334754 bits)
Date Submitted	2012-01-20 00:00:00
Date Available	2012-01-20 00:00:00
Creation Date	2012-01-09 14:54:41
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Document Author:	Administrator

EU Regulatory Conformance
Hereby, Sensixa Ltd declares that this device is in compliance with the essential requirements and
other relevant provisions of Directive 1999/5/EC.
For the declaration of conformity, visit the Web site www.sensixa.com.
Notice: Observe the national local regulations in the location where the device is to be used. This
device may be restricted for use in some or all member states of the European Union (EU)
FCC Statement
Hereby, Sensixa Ltd declares that
This device complies with part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
Changes or modifications made to this equipment not expressly approved by (manufacturer name)
may void the FCC authorization to operate this equipment.
1.0 Introduction
The e‐AR (ear‐worn Activity Recognition) is a bio‐inspired designed sensor which emulates the
function of the human vestibular system in detecting body movements and orientations. By
positioning the e‐AR sensor on the user’s ear, gait, body posture and activity information can be
captured by the miniaturised sensor. It has been widely applied and trialled in sports, well being and
healthcare applications.
From the trials conducted, numerous requests have been received for applying the e‐AR sensor for
other applications, such as long term activity monitoring for elderly patients. In respond to the
potential demands, the e‐AR lite sensor has been designed targeting long term monitoring
applications. This document provides the necessary information for the CE and FCC compliance
examinations.
2.0 e­AR lite sensor system
The e‐AR lite sensor mainly consists of an e‐AR lite sensor and a base station. The ear‐worn e‐AR lite
sensor is designed to capture the posture and activity of the user. The base station, on the other
hand, is simply a charging station and an adaptor for linking the sensor to a PC. Figure 1 depicts the
sensing system diagram.
Figure 1 e‐AR lite sensor and base station
2.1 e­AR (ear­worn Activity Recognition) lite sensor
The e‐AR (ear‐worn Activity Recognition) lite sensor, as shown in Figure 2, is a bio‐inspired sensor
designed to emulate the main functions of the human vestibular system. By positioning the sensor
on the ear, the sensitive sensor can capture the similar information as per the human inner ear, and
detect the posture of the person.
Figure 2 The e‐AR (ear‐worn Activity Recognition Sensor) lite sensor
The e‐AR sensor mainly consists of a MEMS based 3D accelerometer sensor, a microcontroller, a
radio transceiver with USB interface, a flash memory and a rechargeable battery. The MEMS based
3D accelerometer is a micro mechanical sensor which can measure the acceleration with regard to
gravity. The typical sampling frequency is 1Hz per axis. The sensor is designed with a microcontroller
which can be programmed and configured for different applications. The low power radio
transceiver, with maximum data rate of 2Mbps, enables real‐time transmission of sensor data to a
receiver, and the radio transceiver has a built‐in USB interface where the sensor can plug onto a PC
via the base station for downloading the sensor data. The on‐board flash memory can be used to
store sensor data, and it can store up to 1 week of raw accelerometer data. With the low power
processor and radio transceiver, the e‐AR lite sensor can operate continuously for 1 week after it is
fully charged. In addition, to ensure reliability of the sensor, the sensor is designed to be water
proofed and it can operate under up to 1 metre of water.
2.2 e­AR Lite base station
The base station is simply an adaptor for connecting the e‐AR lite sensor to a PC, and it is a docking
station for charging the battery of the e‐AR lite sensor, as shown in Figure 3.
Figure 3 e‐AR lite Base station
The base station is designed to connect to a PC or a USB power adaptor with a micro USB connector.
To ease the docking of the e‐AR lite sensor and provide secure connections, permanent magnets are
embedded on the base station. When an e‐AR lite sensor is docked onto the base station, the LED at
the front of the base station will light up and the e‐AR sensor will be directly connected to the
attached PC via the connecting pins on the base station.
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e­AR Lite sensor technical specification
e‐AR Lite sensor Technical Specifications
Operating voltage range
2.7‐3.6V
Radio Operating frequency
2400‐2483.5 MHz
Maximum radio output power
0dBm
Radio Receiver Sensitivity
‐82 dBm
Maximum GFSK data rate
2Mbps
Operating Temperature
‐10 to 40oC
Sensing Range
3g
Sensing sampling frequency
1Hz to 500Hz
Extended Memory
16MB
Program memory
32KB (MSP430F2274), 32KB (nRF24LU1+)
RAM
1 KB(MSP320F2274), 2KB (nRF24LU1+)
Battery type
Lithium Polymer
Battery cycle life
300 cycles
Battery capacity
45mAhr
Battery life
3 hours(real‐time mode)/12 hours(storage mode)
Operating voltage
3V
Water resistant
IP67

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