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Hardware

TotTag Gen 2 (2023-present)

  • rev_i is a fairly complete overhaul of the TotTag platform, shedding many of the legacy IC selections from the long design history of this project (some traced back to the original 2015 PolyPoint board).

    • The most significant changes are moving from a dual-MCU design to a single MCU, based around the Ambiq Apollo4 family of chips, and upgrading to the newer generation UWB transciever, Decawave Qorvo's DW3000 family.

    • rev_i is in many ways a first revision of a new board.

  • rev_k fixed most of the major flaws in from rev_i, but introduced new problems around the DW3000.

  • rev_l hedged around continued DW3000 issues and replaced the integrated design with three copies of Qorvo's pre-fab module. This is a temporary patch to get working systems with the new transciever more quickly to enable scale-up.

  • rev_m has only trivial, cosmetic fixes over rev_l.

  • rev_n (in progress) removes the pre-fab UWB modules, and returns to the integrated UWB design, which re-opens access to antenna diversity and the improved robustness of ranging performance.

TotTag Gen 1 (2020-2023)

Revisions of the original TotTags from the SociTrack project that focused on the deployability, scaling, and robustness of the caregiver-infant interaction tracking application.

This resulted in a more tightly integrated design as well as one more aggressively geared towards a "wireless only" approach to ease device management at-scale.

For more details, see the documentation in the tottag folder.

SociTrack (and TotTag Gen 0) (2017-2020)

The SociTrack system consists of a single PCB which integrates both an application board and a SquarePoint module. SquarePoint is available from the Lab11 EAGLE library as a design block (check version number).

The original tottags (i.e., rev_c and rev_d) follow this more modularized design, keeping SociTrack's components as cleanly separable features, but integrating into a single PCB dual microcontrollers and enhanced functionality such as SD card logging, accelerometer information, USB connectivity, wireless charging, debugging ports, and LEDs, as well as battery voltage sensing.

PolyPoint (2015) and SurePoint (2016-2017)

The PolyPoint system consists of several PCBs centered around TriPoint, the core UWB ranging module.

  1. TriPoint: A triangular module which contains all of the necessary hardware for utilizing a DecaWave DW1000 UWB radio. It has castellated headers so it can be soldered onto a carrier board to add indoor localization functionality to any device.

  2. TriTag: A portable carrier board designed to be used as an indoor localization tag. Contains TriPoint on one side and a BLE radio on the other.