KOR'K Sensor

KOR'K Sensor 04 The prototype

Chapter 04

The prototype

The V1 as it goes to print: a diamond 12.4 cm along the walls, which fits into a corner. You can turn it, open it and see what it contains.

The V1

The V1 housing, a white diamond with an anthracite fabric front, fitted into the corner of two white walls.
3D render of the V1 prototype, calculated from its model. A photo of the real prototype will replace it as soon as it is printed.

In 3D

The housing, piece by piece

The 3D view loads when you reach this point.

Lightweight model, taken from the V1's CadQuery model (02-modele-3d/kork_sensor_v1.py). Turn the housing with the mouse or a finger. The 3D view is only downloaded as you approach this section.

Dimensions

An object the size of a hand

12.4 cm

along each wall

11.8 cm

high

9.1 cm

wide, for the diamond with rounded edges

20°

of camera tilt below the horizontal

Source: V1 technical drawings (9 Nov 2026), page 1. When the drawings were dimensioned, the real width of the diamond turned out to be 91 mm, not 108 mm (the theoretical diamond with sharp corners).

Inside

What is inside

Interior view of the housing: the Raspberry Pi 5 on the axis, behind the camera.
The Raspberry Pi 5 sits on the axis of the diamond, behind the camera: it did not fit lying flat against a wall. Render of the 3D model.

The wiring

Tap or hover over a component.

Inside the device Outside the device 200 mm ribbon USB-A port 4 Dupont wires 90° USB-C Camera Module 3 Wide 12 MP, wide angle Module LED RGB the indicator light Raspberry Pi 5 4 GB, official cooler CAM/DISP 0 Micro USB 22 × 19 × 4 mm Alimentation 27 W USB-C, certified 230 V Inside the device Outside the device ribbon USB-A port 90° USB-C Camera Module 3 12 MP, wide angle LED RGB the indicator light Raspberry Pi 5 4 GB, official cooler CAM/DISP 0 Micro USB 22 × 19 × 4 mm Alimentation 27 W USB-C, certified 230 V

Sources: V1 drawings, wiring figure (03-plans/figures/5_cablage.png); shopping list (04-achats/liste-achats.json, 10 Nov 2026). Simplified diagram, not to scale.

ComponentRole
Raspberry Pi 5, 4 GBThe device's computer: records, finds the child, keeps useful moments
Official Active CoolerCools the Pi 5 under continuous load
Official 27 W USB-C power supply (EU, white)Certified power supply, outside the device
Camera Module 3 Wide12 MP wide-angle camera (120° diagonal, 102° horizontal)
Pi 5 camera cable, 200 mmConnects the camera to the Pi 5 (22 → 15 pins)
Official 32 GB microSD cardOperating system and device software
Female-female Dupont wires 10 cm (40-way)Solder-free wiring of the light
90° angled USB-C adapter (Delock 60287)Lets the power plug fit inside the device while carrying the Pi 5's 5 A
RGB LED module 5050 (built-in resistors)Recording light with adjustable colour (1 spare)
Mini USB microphone 22 × 19 × 4 mm (794 / Sxhlseller)Sound, plugged straight into a Pi USB port

Source: prototype shopping list (04-achats/liste-achats.json, 10 Nov 2026). Prices and quantities in chapter 07. The power supply stays outside the housing: no mains voltage inside. Neither the Raspberry Pi nor the iPhone analyses anything: who does what.

The facade

A shutter you close by hand

A small button above the lens slides a white disc in front of it. When closed, nothing gets through, whatever the state of the software. Below the lens, the indicator light: white during the preview, red during recording.

Housing facade, shutter open: the lens is visible.
Shutter open.
Housing facade, shutter closed: a white disc covers the lens.
Shutter closed.

For Nuremberg

A translucent facade: nothing hidden

The working housing will have a translucent facade: you can see the electronics and their colours, and understand that nothing is hidden. A fully translucent shell would have had two flaws: the room's light would have fogged the image, and the indicator light would have lit up the whole shell. So I cut the facade into two parts of the same object, a translucent shell and a black block around the camera and the indicator light, printed in a single go.

A second housing, empty and white, can be handled freely. It costs only filament.

The translucent facade with the indicator light white, then red.
The indicator light through the facade: white, then red. Render of the 3D model, to be checked on the printed part.
The tidied cables, visible through the translucent facade.
The cables are visible: a ribbon cable folded concertina-style and small black printed clips to hold them in place.

Coming soon

Photos of the real prototype

Printing of the V1 is planned for 15 to 19 November, with assembly straight after. The photos will replace the renders here.

Sources: design journal, steps 8, 9, 11 and 13; backward-planned schedule (03-plans/planning.md, 9 Nov 2026).

The question

Why not an off-the-shelf camera?

It is a fair question: indoor cameras are already sold ready-made. I still built this unit, for three reasons.

  1. The unit was the starting idea. My March 2026 file already describes it (chapter 01). Nuremberg is testing precisely its shape and its place in the home, which an off-the-shelf camera would not allow.
  2. Trust shows on the object. It sits in a corner, its front is fabric, a shutter closes by hand, an indicator light shows when it is filming, and I control the path the videos take (chapter 06).
  3. The stand rules are enforced by my own software: consent before recording, clips kept in RAM, the shutter detected in the image, deletion at the end of the demo. On an off-the-shelf camera, the software and the cloud are not mine.

Sources: KOR'K file (30 March 2026); 06-logiciel/README.md (rules enforced by the software and checked by automated tests); chapter 06.