rimwell

Your gut keeps a diary. This pod tracks it.

A pod on the toilet rim photographs the bowl at each flush. It flags changes in stool form, urine color and visit timing from your baseline.

See how a visit becomes a report
The Rimwell pod in sage, hanging on the outside of a white toilet bowl just below the seat
A render of the revision A pod.

From visit to report

Animated sequence of a visit. Someone sits down and the pod wakes on motion. At the flush the light comes on and the camera takes the pictures, which go over Wi-Fi to the cloud for analysis. The report then appears on the phone and the pictures are deleted. Pictures deleted 07:43 Rimwell REPORT CARD · ALEX Today at 07:42 Stool type Type 4, healthy Smooth and soft, the shape to aim for. Hydration Score 71 Gut Health Score 82 · steady Logged to your week

The reports

Each visit adds to trends against your own baseline, which takes about 14 days to set. These reports track wellness and do not diagnose disease.

07:43Rimwell
Report card · AlexToday at 07:42
Stool typeType 4, healthy
1234567HardHealthyLooseLiquidSmooth and soft, the shape to aim for.
Hydration Score71
Gut Health Score82 · steady
Logged to your week

The report card after every visit, with example values. If red is seen in the bowl it carries a red flag and a line to see a GP.

Bathroom habits

when you go, over 14 days
wk 1wk 200:0006:0012:0018:0000:00

Most visits after 07:00. 2 night trips (23:00 to 06:00, shaded) in 14 days.

Gut Health Score

82steady

30 days of form and regularity.

Hydration

from urine colour
well hydrateddehydrated

71 Hydration Score, example

The pod

The pod hangs outside the bowl and reaches over the rim to a camera lip that tilts 35 degrees toward the water.

  • 80 x 42 x 25 mm
  • Sealed face with hidden touch pads
  • 2000 mAh cell, USB-C charge in about 7 hours (estimate)
  • Fits rims 25 to 34 mm wide without tools
The Rimwell pod in sage on a concrete block, with the ripple mark debossed in the centre of its face. Drag to turn it.
Drag to turn the pod.
The pod on a thin 25 mm rim, where the fins stand out and still reach the bowl
25 mm rim, fins out
The pod on a thick 34 mm rim, where the fins fold flat against the hook
34 mm rim, fins folded

Inside the pod

Two printed shells snap together around the board and the cell.

See-through render of the closed pod showing the board, cell, camera, LED ring, touch springs, microphone vent and USB-C port
  1. Board
  2. Cell, behind the board
  3. Camera and LED ring
  4. Touch springs
  5. Microphone vent
  6. USB-C port
Exploded view of the pod. The lid, board, and cell are separated from the tub and the fin sleeve.
Exploded
Annotated side section of the pod showing the cable route from the board over the rim to the camera
Side section with the cable route
Front view with the lid off, showing the board on its four bosses, the cell, and the connectors
Front with the lid off

Dimensioned drawing (PDF)

Photoreal render of the revision A board on brass standoffs, turning. Drag to turn it.
Revision A, 64 by 28 mm with a tab that carries the USB-C to the wall. Drag to turn it.

The board

A four-layer board designed for the pod.

  • ESP32-S3 with Wi-Fi and Bluetooth
  • 16 MB flash and 8 MB PSRAM
  • OV2640 2 MP camera
  • 6 high color-rendering LEDs at constant current
  • 256 MB soldered storage
  • 3.3 V across the 3.0 to 4.2 V cell range

Schematic (PDF) Top view Bottom view

Side section of the hook and camera lip below the rim, numbered: the hook, the camera with its LED ring and window, the rim, and the camera axis pointing down into the bowl

Privacy is a matter of geometry

The camera sits under the rim and points at the water. The cloud is designed to delete the pictures after analysis and keep only the results as numbers.

Prototype status

  1. Done

    • Schematic complete
    • Parts chosen and priced
    • Housing modeled and checked on three rim widths
    • Reports specified

  2. Now

    • Board placed and partly routed on the 64 by 28 mm outline

  3. Then

    • Firmware, a labeled image set, a revision B board