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wifi-densepose/assets/sensors/README.md

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Sensor & antenna hardware inventory

Photos of the additional sensor + antenna hardware staged for ADR-120+ experimentation in this deployment. Captured 2026-05-18.

File What it is Role
sensor_01.jpeg 5× u.FL (IPEX-1) pigtail antennas, bare cable External antenna feed for ESP32-S3 boards that have a u.FL connector but currently use the on-PCB chip antenna. Adds gain + diversity once attached.
sensor_02.jpeg 4× flat PCB-strip antennas (2.4 GHz, FR4 copper trace, 3M double-sided tape backing) + u.FL pigtails Stick-on external antennas — better gain than the chip antenna, doubles as polarisation diversity if mounted perpendicular to one another.
sensor_03.jpeg HLK-LD2402 24 GHz mmWave radar module (V1.0, chip S1KM0008 2438 batch), TX/RX patch antennas, UART output New modality. mmWave gives sub-mm range to a moving target — useful for vital-sign disambiguation alongside WiFi CSI. UART @ 256000 8N1.
sensor_04.jpeg CP2102 USB-to-UART bridge (AMS1117-3.3 LDO, USB-A) Powers + reads the HLK-LD2402 from a Mac/Linux host. Pin map: GND / RXT / TXD / 3.3V / RTS / CTS.
sensor_05.jpeg The two boards from sensor_03 + sensor_04 wired together Working HLK-LD2402 setup ready to receive on a USB tty (no firmware needed — module ships with its own factory firmware).
sensor_06.jpeg Back of ESP32-S3 dev board with microSD slot, marked "Camera / SD Card / PSRAM", dual USB-UART + USB-OTG Different board family from the 6 already in service. SD slot + USB-OTG + on-board camera connector make it a candidate for on-device camera ground-truth capture (alternative to using the Mac webcam for ADR-079 / Pack E.2 retraining).
sensor_07.jpeg ESP32-S3-WROOM with OV-camera mounted + camera ribbon FFC connector Same board family as sensor_06. Camera ribbon already attached. With WiFi CSI + onboard camera in one device, this could collect synchronised paired data (CSI + image) entirely without involving the Mac — the missing piece for the wiflow fine-tune Pack E.2.
sensor_08.jpeg Back of YD-ESP32-23 2022-V1.3 (V2356) dev board Same board family as the 6 currently provisioned (nodes 1-6). Spare.
sensor_09.jpeg Front of YD-ESP32-23: ESP32-S3-N16R8 WiFi+BT module, FTDI USB-serial, RGB LED, dual USB-C Confirms it's the same hardware we flashed for nodes 3-6 (FT232R serial chip on board, see /dev/cu.usbserial-A5069RR4 during provisioning).

Suggested next moves

  • u.FL antennas (sensor_01/_02) — attach to the two "near-AP" nodes (n1, n5) which currently sit at sep_ratio ~0.05 per the ADR-118 audit. External antenna oriented perpendicular to the body axis should pull more body modulation into the signal.
  • HLK-LD2402 mmWave (sensor_03–05) — start as a vitals ground-truth reference for the WiFi pipeline. Connect via the USB-UART, log breathing rate at the same time as the WiFi vitals detector, compare. Later fuse via MultistaticFuser if accuracy improves materially (would warrant a fresh ADR).
  • Camera-bearing ESP32-S3 (sensor_06/_07) — the cleanest path to Pack E.2 (WiFlow camera-supervised retrain): collect synced (CSI, MediaPipe keypoints) pairs entirely on-device. Avoids the awkward "laptop is the camera AND the server AND in the sensing zone" problem from the earlier session.
  • Spare YD-ESP32-23 (sensor_08/_09) — flash with the same build + provision.py --node-id 7 if/when a 7-node deployment is desired. Bring-up is 5 min per the ADR-117 OTA recipe.

These are reference photos only — not used by any code path. Linked from docs/use-cases.md and CHECKLIST.md Deferred section so future sessions can see the available hardware at a glance.