Basis B1 Fitness Tracker Teardown

ID: 23881

Description: This time around, it is time to open up an...

Steps:

  1. Technical Specifications
  2. 1 MHz RISC 16 Bit MicroController, Active Mode @ 400uA
  3. Ultra Low-Power Consumption at Standby Mode @ 1.3uA, and Off-Mode with RAM Retention @ 0.22uA
  4. Sensors onboard: Optical blood flow; Galvanic Skin response (perspiration), Ambient Temperature, Body Temperature, 3-Axis Accelerometer
  5. First, you begin by taking off the straps. . If you have taken out a watch strap before, it is a similar method
  6. Flip the watch, use the plastic opening tool and slide into end of the strap, then push the spring contacts until the strap just breaks away from its catch
  7. Independent electrodes to possibly modulate AC Signal onto your skin and measure at the receiving end. Possibly measuring impedance (thereby knowing how much you sweat)
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  8. Unscrew the four screws at the back of the watch, then gently use the spudger to open it
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  9. Remove the elastomeric (aka zebra) connector
  10. Then pull the power plug away from its supply point to remove the battery
  11. Unknown battery capacity
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  12. You see the gap in between here? That gap exist where the LCD sits beneath the MCU board.
  13. Using a bit of highly precise de-soldering technique (left quite a few melted marks btw), you have to desolder the 4 contact points in order to separate the board from the LCD panel
  14. P/S: Credit to my peer who helped me out. Fortunately it wasn't me. Else I would have left quite a larger mess :)
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  15. 1st Temperature Sensor (Texas Instruments) TMP112 marked as OBS. This might be one of the sensors that detects the ambient temperature as it is positioned away from the human body
  16. Thanks to Luis Filipe Rossi for identifying the external SOT563 temperature sensors
  17. 25P32V6G - ST 32MB NOR Serial Flash Memory
  18. Analog Devices - ADXL335B, 3-Axis Accelerometer
  19. Freescale MPR121 Proximity Capacitive Touch Sensor Controller (for the 4 capacitive touch buttons) as listed at this site & pictured here
  20. MSP430xG461x- Texas Instruments MSP430 family of ultralow-power mixed signal microcontroller. Built-in Temperature Sensor.
  21. Unknown 31939591322
  22. Unknown H852 3N47
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  23. I'm quite interested of what they have done here. Instead of doing their own RF design, they employed a module design. Too bad there is no way to give the RF Module company any publicity Edit - the module is BT23 from ampedrf
  24. Cortex M3 - STM32F103C6; Low-density performance line, ARM-based 32-bit MCU with 16 or 32 KB Flash, USB, CAN, 6 timers, 2 ADCs, 6 communication interfaces. Built-in temperature sensor here
  25. Unknown 2500D8, 90MT323 Bluetooth Transceiver Chip
  26. Chip Antenna
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  27. The wire bonded Optical Blood Flow Sensor (under a magnifying glass) with the two LED
  28. 2nd Temperature Sensor (Texas Instruments) TMP112 marked as OBS. This might be one of the sensors that detects the body temperature as it is positioned nearer to the human body
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  29. The Basis B1 Tracker was an easy device to disassemble. Apart from the de-soldering process, it could quite be a minimal effort.
  30. That's it, leave more comments below if you would like to have more additional details of the specific part you are interested in.
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