Your SlideShare is downloading. ×
0
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms

891

Published on

Presented during IEEE 2012 Sensors Applications Symposium, Brescia University, Italy, February 7-9 2012

Presented during IEEE 2012 Sensors Applications Symposium, Brescia University, Italy, February 7-9 2012

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
891
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
18
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Project goal Outline Acquiring Transmitting Receiving Conclusions Evaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms Dept. of Information Engineering, University of Brescia C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. Vezzoli IEEE 2012 Sensors Applications Symposium University of Brescia, Italy February 7-8-9C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 2. Project goal Outline Acquiring Transmitting Receiving ConclusionsPreamble: modern smartphones External sensors Internal sensors WiFi Accelerometers Gyroscope GPS Bluetooth Camera Microphone Zigbee, Ant+, ... Proximity Ext. ..... hardware GSM/UMTS/4G World Wide range of internal sensors. Wide range of connectivity capabilities.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 3. Project goal Outline Acquiring Transmitting Receiving ConclusionsObjective Create a common interface between an external sensor (e.g. biometric) and a generic smartphone platform. Biometric data Smartphone Common interface Real time streaming. OS/Platform independent.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 4. Project goal Outline Acquiring Transmitting Receiving ConclusionsSelecting the right interface Peak energy Data Availability on consumption Additional transmission Smartphones during costs cost transmission Bluetooth common low NO NO WiFi common medium NO NO GSM/UMTS common high YES NO External HW limited ? NO YESC. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 5. Project goal Outline Acquiring Transmitting Receiving ConclusionsAdvantages of Bluetooth Available on almost every smartphone on the market. Many profiles for different uses (not every one is always available).C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 6. Project goal Outline Acquiring Transmitting Receiving ConclusionsBluetooth Hands-Free Profile HFP Profile for connection with an external hands-free device. Bi-directional audio channel. Available on almost every smartphone on the market. Already in use or ready for other applications (telephony, navigation, ..). Biometric signal can be multiplexed to preexisting transmissions.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 7. Project goal Outline Acquiring Transmitting Receiving ConclusionsBluetooth HFP: signal requirements Signal received for different input SNR [dB] for received signal for amplitude values, versus different input amplitude values, frequency. versus frequency. The best band to transmit is between ∼ 100 Hz and ∼ 600 Hz.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 8. Project goal Outline Acquiring Transmitting Receiving ConclusionsWorking example: heart monitor To test the use of Bluetooth HFP to transmit sensor data, we built a simple heart signal monitor. The system is composed of: An optical sensor. A filtering/amplifying/modulation stage. A commercial bluetooth headset. Custom applications for both iOS and Android platforms to show the signal.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 9. Project goal Outline Acquiring Transmitting Receiving ConclusionsHeart monitor system outline Sensor Reception Filter Demodulation Amplifier Visualization Channel modulation Recording Analysis TransmissionC. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 10. Project goal Outline Acquiring Transmitting Receiving Conclusions Heart monitor system: Acquiring Transmitting ReceivingC. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 11. Outline Acquiring Transmitting Receiving
  • 12. Project goal Outline Acquiring Transmitting Receiving ConclusionsPhotoplethysmography: principles An optical non-invasive way to measure the blood flow through a body part. Blood flow Vout Body part Photodiode Phototransistor The output voltage is proportional to the opacity of the body part, hence to the blood flow through the capillaries.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 13. Project goal Outline Acquiring Transmitting Receiving ConclusionsRaw signal from sensor The raw signal from the sensor is low (∼ 4-6 mV) and noisy. It must be low pass filtered (∼ 6 Hz) and amplified.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 14. Project goal Outline Acquiring Transmitting Receiving ConclusionsTreated signal The filtered and amplified signal appears as shown in figure. Arbitrary unit Arbitrary unit Time [seconds] Frequency [Hz] Figure: Signal from sensor and its spectrum The heart beat can be clearly seen.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 15. Outline Acquiring Transmitting Receiving
  • 16. Project goal Outline Acquiring Transmitting Receiving ConclusionsSignal modulation The PPG signal is below the lower cut-off frequency of the Bluetooth module, so it needs to be modulated to translate its spectrum in the band pass. Filtered PPG signal Square wave 366 Hz Schmitt trigger oscillatorC. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 17. Outline Acquiring Transmitting Receiving
  • 18. Project goal Outline Acquiring Transmitting Receiving ConclusionsFiltering The demodulation is based on a software moving average filter, which selects partially-overimposed windows, eliminates peak samples (lowest and highest) and averages the rest. Sample implementation of a moving average digital filter Windowing Ordering Selecting Averaging Recovered Signal t Modulated SignalC. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 19. Project goal Outline Acquiring Transmitting Receiving ConclusionsDisplaying Android software. iOS (iPod Touch) software.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms
  • 20. Project goal Outline Acquiring Transmitting Receiving ConclusionsConclusions Following our research, we found that the Bluetooth HFP profile, normally used to transmit a vocal signal to a smartphone, can be also used to transport biometric data from an external sensor, provided that the biometric signal can be modulated in the 100-600 Hz band. Advantages: Wide availability: all smartphones OSs (iOS, Android, ...), but also PCs and embedded systems. Enough bandwidth to transmit (more than one) slowly varying biometric signals. Low cost, easy to use.C. M. De Dominicis, D. Mazzotti, M. Piccinelli, S. Rinaldi, A. VezzoliEvaluation of Bluetooth Hands-Free Profile for Sensors Applications in Smartphone Platforms

×