Coralboard Protective Case

CoralBoard SL protective case with active cooling, screen, camera, speaker, microphone, and detachable wall dock.

Give your Synaptics Coralboard SL a compact, enclosed home with a clear front interface and a wall mount you can take to the workbench. FIELD / SL brings a portrait screen, camera, microphone, speaker and 30 mm fan into a 79 × 66.5 × 36 mm body, closely surrounding the official 73 × 58 mm board.

- A clean front layout: vertical display on the left, camera at the upper right, microphone and speaker below the display, cooling intake on the right.

- Take it down, keep the dock: unplug, loosen the recessed thumb screw and take the case off the wall. The receiver stays on the wall.

- Built for access and improvement: removable front cassette, side covers and rear hatch; separate device mounts and adjustable PCB pads.

- A useful starting point for your own project: develop a status panel, sensor interface or experimental AI station

The receiver adds 8 mm: nominal wall-to-front depth is 44 mm, before screw heads and external cables. Leave at least 23 mm above the case, plus cable slack, to remove it. Power connects directly to the board; the dock has no electrical contacts.

What you need

This is a design-file download. Electronics, hardware, wiring and filament are supplied by you. It suits makers comfortable measuring, soldering and configuring embedded Linux. Use the production Coralboard SL / SL2619; this enclosure is not for the older Google Coral Dev Board.

Selected electronics for complete build:

- 1 Synaptics Coralboard SL / SL2619: main computer; official mounting pattern 65 × 48 mm, Ø3.2 holes.

- 1 Waveshare 22224 LCD Module: 1.47-inch portrait, 172 × 320, ST7789V3, SPI, non-touch.

- 1 Arducam B0033: fixed-focus OV5647 camera, 25 × 24 mm PCB.

- 1 Arducam B0087 or verified equivalent camera ribbon: camera-specific 22-pin 0.5 mm to 15-pin 1 mm CSI conversion. Verify pinout and contact orientation; do not use a DSI ribbon.

- 1 Adafruit 3421: SPH0645LM4H I²S microphone, powered at 1.8 V for the selected signal domain.

- 1 Adafruit 3006: MAX98357A mono I²S amplifier, powered at 5 V.

- 1 PUI Audio AS01508MS-WP: 15 × 11 × 3 mm, 8 Ω / 1 W speaker.

- 1 SUNON MF30100V2-1000U-A99: 5 V, 30 × 30 × 10 mm fan with three mounting holes.

- 1 DFRobot FIT0640 supply: regulated 5 V / 3 A USB-C with included cable; US mains plug. Choose a suitable regional equivalent if needed.

- 1 suitable microSD card, if missing: at least 16 GB, C10/U1/V10 and A1 or better; reuse a suitable supplied card.

- 1 custom short harness set: LCD, microphone/amplifier, fan/control and speaker branches, with removable service connections.

- 1 × 1 kΩ resistor: amplifier SD control series resistor.

- 1 × 10 kΩ resistor: amplifier startup-mute pulldown.

- 1 × 100 kΩ resistor: amplifier gain selection.

- 1 additional 100 kΩ resistor, conditional: microphone data pulldown only if absent from the actual assembly.

Start with Hardware_Electronics_BOM.csv. The accompanying Hardware_Electronics_BOM archive (ZIP) contains XLSX, CSV and Markdown versions. Its 46 lines provide quantities, part numbers, source links, uses and ordering checks. Printed parts and spares are excluded. FULL_PRINTED_AND_PURCHASED_BOM.csv includes printed parts too.

The complete hardware totals are 48 screws, 24 nuts, 20 inserts and 34 washers, plus up to four wall anchors. Small cable ties, thin compliant gasket material and optional removable retention adhesive complete the list. Follow individual specifications: the two M2 insert sizes differ, cover screws are 90° M2×5 flat-head, head Ø≤3.8 mm, and the wall lock requires a DIN 653 M3×6 thumb screw with Ø12 × 2.5 mm head.

You need filament, a suitable printer and slicer, calipers, small drivers, soldering and heat-set-insert tools, wire preparation tools, a multimeter, microSD reader and computer. Select wall tools, screws and anchors for your actual surface.

Check before buying and printing

The 1.47-inch screen keeps this layout compact; larger screens require a remix. Measure the delivered camera lens stack, amplifier terminal block and cable bends. The harness is a custom fabrication task: wire sizes, lengths, J4 mating connector and service connectors need selection against the real assembly.

The USB-C overmould must be no more than 7 mm high. Measure the delivered FIT0640 plug; electrical suitability does not establish its mould dimensions. Width and bend clearance also need checking. A checked 8 mm-high digital example does not fit.

There are 20 printed designs: 16 functional designs make 27 pieces, with four optional designs for two dovetail coupons, a cable comb and a 9 mm-high PCB fit gauge. PRINTED_PART_QUANTITIES.txt lists exact filenames and repeat counts.

Suggested starting settings: PETG indoors, or ASA with a suitable enclosed printer; 0.4 mm nozzle, about 0.2 mm layers, five perimeters and 40–50% infill for the dock/mounting parts. Review supports around receiver undercuts, shell bosses/I/O lintels and deeper cradles. These are prototype starting settings.

Print the dock coupons first in your intended material/orientation. Check the real board using the PCB gauge, carrier, four sliding pads and four 5 mm spacers. Set mounting axes to (±32.5, ±24) mm; the board outline is offset from that pattern centre.

Assembly, interfaces and service

Read FIELD_SL_P4_Build_Guide.pdf, ASSEMBLY_AND_PRINTING.txt and ELECTRONICS_AND_WIRING.txt. Install inserts with electronics removed. Keep the specified insulating washers/spacer stacks and check screw-tail clearance. Assemble the front cassette separately, leave removable service loops and keep wiring out of the fan.

The LCD uses SPI1, camera CSI, and microphone/amplifier I²S2 with separate input/output data; USB-A remains available. The source bundle includes display-driver and overlay material with bring-up notes. Kernel/device-tree setup and real-board testing are required for SPI, camera, I²S receive-clock routing, simultaneous audio and header power budget. The current sensor-HAT overlay disables the selected SPI1 route.

Follow the wiring guide's 1.8 V J4 signal limits, amplifier gain and startup-mute circuit. Neither bridge-amplifier speaker terminal is ground. Test interfaces separately, then check power, temperatures and audio under the intended closed-case workload.

USB-A, USB-C, Qwiic, User/Reset and microSD have access openings. Side-cover removal exposes battery/audio connections; front-cassette removal exposes headers and CSI. The rear hatch exposes the central underside; outer test pads can require board removal. Accessory-assigned pins remain occupied. Mounts fit the selected parts; adapt STEP/CadQuery files for alternatives.

To detach: unplug leads, loosen the thumb screw about six turns, lift 18 mm and pull away. Keep a loose external cord loop beside the dock. Use matching P4 carrier/receiver parts and wall-appropriate fasteners; no load rating is claimed.

Share build results when you make or remix it; help turn this compact prototype into a better shared project!