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Arduino Sealed Case

by Conseils, published

Arduino Sealed Case by Conseils Oct 23, 2016
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Arduino Sealed Case by Conseils is licensed under the Creative Commons - Attribution license.

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Summary

Arduino case (in the case shown for a Leonardo)

An IP65 possibly to IP68 case for Arduino foot print PCB's

This unit was used in our Greenpower F24+ race car project (http://www.greenpower.co.uk/), as the prototype and test data logger. It is also used for general Arduino and PicAxe projects.

Sealing peas used for cable exist are AMP Supereal 1.5 peas Radio Spares (rswww.com) RS Stock No. 314-1176 TE Connectivity Mfr. Part No. 281934-4 (http://uk.rs-online.com/web/p/connector-wire-interface-seals/3141176/). When fitting pea seals, ensure the holes are the correct sizes and lubricate with soap to permit insertion. Alternatively use your favourite silicone sealant in place of pea seals. To restrain the cable internally use a cable tie or similar.

This case ( without with the test USB access port ) has run in 4 races in the rain and been left out doors in a tool shed over the winter. When correctly printed the case is dust, spray and splash proof. If you have poor or incorrect layer bonding or poor seam re-starts, consider spraying the case with a plastic filler or otherwise treating the surfaces for improved performance. As the volume of the interior is considerable there may be some minor pumping action through cables passing into the case if cable ends are not sealed.

The ends are printed separately to allow different features (sensors, indicators, switches cables etc) to be added or removed as necessary. Printing an additional slightly modified version of the centre section allows an Arduino Mega 256 to be housed using the same set of components.

Recommend stainless steel screws and nuts if the item is expected to get wet.

An elastomer bumper is included in the STL files which was used to protect the module ends. This optional item is not recommended where full sealing is required.

STEP files are included in a ZIP file to permit easier modification where needed

Note you should take your own steps to validate sealing integrity as printing quality can be so variable.

Print Settings

Printer Brand:

RepRap

Printer:

Huxley #710

Rafts:

No

Supports:

No

Resolution:

0.25

Infill:

20 %


Notes:

Make careful consideration of changing layer print height for the end plates as the seals are designed to sit a little above the end plates. Changing layer heights (due to rounding of dimensions through layer height selection) may result in the seal position being incorrect.

If sealing is necessary, it may be better to print the end covers with higher infill levels up to 100%. As stiffness is needed to compress the seals.

Tighten screws evenly, do not over tighten the screws as this may distort the case unnecessarily.

The seal is created from Ninjaflex filament (see attached drawing). To save having to print the seal the filament is used in its raw form.

Custom Section

Instructions

Print the STL files, one of each. Settings detailed below.
1) Calibrate your printer for dimensions
2) Print 1 of each STL files in different colours perhaps
3) Use 3.0 mm screws to retain the covers
4) Post some pictures of your thing.
or
Download the STEP files and modify as required. Upload your modified files into Thingiverse and post some pictures.

Background
This is an enclosure for an Arduino format PCB and allows one expansion module to be fitted. In our case an Adafruit SD card and GPS module
The screws used are 3.0 mm diameter ~20mm threaded length with M3 nuts all purchased from Radio Spares (rswww.com)

Derivative changes
N/A

Design For Manufacture
Assumes 0.50mm nozzle and prints on a 140 x 140 mm bed x 90 mm height. No significant over hangs.

Safety
Take care if using sharp tools.

Sample Part Manufacturing Technical Documentation
Printer : Huxley #710 (RepRap Pro)
Firmware : Marlin 1.0.0 RC2 - 15 Feb 2013
Software : RepRap Pro Software 811708f - Pronterface
Slicer: Slic3r 1.2.9

Material : PLA - Last of the RepRap Pro Black PLA
Material Dia. : 1.75 mm (Msd 1.80 mm )
Nozzle : 0.50 mm
Layer height : 0.25 mm
Layer width : 0.5 mm
Extrusion T : 202 C
Bed T : 60 C
Feed Rate : 28 mm/s
Perimiter rat. : 0.5
Infil pattern : Hexagonal
Infil solidity : 0.20
Cooling Fan : No
Bed material : Borosilicate Glass
Over hangs : No
Support : No

Material: NinjaFlex Midnight (black)
Material Dia. : 1.70 mm
Nozzle : 0.50 mm
Layer height : 0.25 mm
Layer width : N/A
Extrusion T : N/A
Bed T : N/A
Feed Rate : N/A
Perimiter rat. : N/A
Infil pattern : None
Infil solidity : 1.0
Cooling Fan : No
Bed material : N/A
Over hangs : No
Support : No

Design For Manufacture Parameters
Model : Absolute dimensions
Scale : 1:1
Holes : Yes
Layer height : 0.25 mm
Layer width : 0.5 mm
Over hangs : Yes - 45° usually not an issue
Support : No

Model Tools
Function: Model Fix up
Tool: NetFab Studio Basic
Version: 5.2.1

Function: Model adjustment
Tool: FreeCAD
Version: 0.16

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