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i Badge V1.0

i Badge V1.0. Contents: Properties Sensors Bluetooth interface Inferfacing iBadge SW development Energy monitoring Speech processing PCB / Enclosure. Presented by Ivo Locher. Aim of iBadge. Investigate behavior of children in a Kindergarten

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i Badge V1.0

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  1. iBadgeV1.0 • Contents: • Properties • Sensors • Bluetooth interface • Inferfacing iBadge • SW development • Energy monitoring • Speech processing • PCB / Enclosure Presented by Ivo Locher

  2. Aim of iBadge • Investigate behavior of children in a Kindergarten • Research subject for embedded systems / position tracking / wireless networks /speech recognition • Basis for further applications

  3. Properties of iBadge • Speech recording / replaying • Position detection • Direction detection / estimation (compass) • Tilt • Weather data: Temperature, Humidity, Pressure, Light

  4. BlockdiagramiBadge

  5. iBadge components • ATMEGA 103L- 128kB Flash, 4kB SRAM, 4kB EEPROM- 4MHz Clock, 32kHz timer- QFP package • DSP TMS320VC5416- 64kB DA RAM, 64kB SA RAM, Harvard- 8MHz ext. clock, up to 160MHz internal clock (PLL)- flexBGA package

  6. Data exchange • DSP Host-Port  AVR address / data bus • 8Bit • Hardware interrupt driven • Host-Port enables AVR to access entire memory space of DSP

  7. Sensor specs • Temperature- 16Hz Fs, -55 to +125oC, 0.25 K/LSB • Battery current monitoring*- 16Hz, various resolutions: 0.626 – 2.44 mA/LSB • Accelerometer**- 10Hz Fs, +/- 2g, duty cycle • Microphone- 16kHz Fs, 16Bit/sample (Codec), 20kHz BW

  8. Sensor specs (cont’d) • Position tracking (ultrasound, RFM)- 10Hz, 10cm resolution • Weather sensors (humidity, pressure, light)**- 400Hz, analog • Magnetic field*- 15Hz, +/- 6gauss, analog • * On board calibration / ** external calibration

  9. Sensor specs (cont’d)

  10. interface • Fc = 2.400 – 2.483 GHz • GFSK, BT = 0.5 • Nominal output power = 0 dBm (1mW) • Frequency hopping with 79 channels • Approx 1Mb/s, TDMA, time slot=625 s • Distance: 10..30m (1mW)

  11. Bluetooth (cont’d) • 1 Master, 7 Slaves • Asymmetric mode w/ 723.2kb/s downlink, 57.6kb/s uplink (ACL) • Symmetric mode with 433.9 kb/s (SCO) • 3 simultaneous synchronous voice channels with 64kb/s

  12. Bluetooth (cont’d) • EricssonROK 101 007 • ARM7-Thumb • Programmable • UART used(460kB/s) • RFCOMM

  13. Interfacing iBadge • Connector board- RS232 connection between PC, AVR, BT- JTAG interface toDSP debugging- free RS232 from/to AVR (i.e. for a terminal)

  14. Connector board (35x80mm) • Top Bottom

  15. Interfacing with RS232 • 3 connections (RS232):- BT  AVR- BT  PC- PC  AVR

  16. Connection • PC AVR- Download of AVR-SW and DSP-SW into Flash / EEPROM of AVR- Download-SW / cable provided by Atmel- File format: Intel HEX-File- AVR-SW runs on TinyOS- AVR boots up DSP over Host-Interface

  17. Connection (cont’d) • BT  PC- configuring/programming of BT interface- download of a separate program running on the BT module- sending data from PC over BT • BT  AVR- normal running mode of iBadge- future: programming of AVR / DSP

  18. SW Development Scenario • AVR-SW development on Atmel Compiler,testing / debugging over RS232 • DSP-SW development with TI Code Composer Studio,testing / debugging over JTAG interface

  19. Scenario (cont’d) • Stand-alone version:- DSP-SW must be included in AVR-SW (as binary array, *.abs)- AVR-SW (including DSP-SW) download over RS232 interface / storing in Flash on AVR- Boot up: AVR-SW starts / keeps DSP in reset- DSP-SW download over host interface (8 Bit) - DSP releasing from reset and DSP-SW starts

  20. Energy monitoring • 4 Battery monitors:- Entire circuit - All sensors- DSP - Bluetooth • On/off-switching of partial circuits:- All sensors - Only weather sensors- DSP - Bluetooth

  21. Tree structure Switching / battery monitors are controlled by AVR

  22. Battery • Li-Ion • Voltage: 3.6V • Capacity: 700mAh (= 9kJ) • Approx. battery life, when everything is on all the time: 3.5h • estimated battery life for normal operation: 5.4h

  23. Motivation for Energy Monitoring • Find optimal scheme what most energy efficient is, i.e.:- Codec: speech compression/feature extraction vs transmitted data computational power consumption vs radio (BT) power consumption

  24. Motivation (cont’d) • Run entire or parts of iBadge in a mode, which is most energy efficient.=> duty cycle (Sung Park) Power up Power down t T

  25. Speech processing • Implementation of different Codecs G.722 (G.729, proprietary) • Front-end processing of speech on iBadge • Seamless switching between them  Energy efficiency / data rate / recognition rate

  26. Codec G.722 • Output data rate: 64kb/s • 7 kHz analog BW

  27. PCB (62.5 x 47mm) Top Bottom

  28. PCB (cont’d) • PCB size: 62.5 x 47mm (same width as battery) • 4 signal layers / 6 power planes with separate analog plane • 0.006” tracks / 0.004” clearance • Additional small board (7mm), perp. for acceleration sensor(z-axis)

  29. Enclosure Prototype Pocket clip Finally: a customized enclosure

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