oneohm
Published © GPL3+

OHMni-Stick

Ultra Low Force and Displacement Assistive Tech Joystick

IntermediateWork in progress62

Things used in this project

Hardware components

Enclosure
3D Printed - 100% infill ABS, ~57 grams, Material cost ~$1.25
×1
Push_Plate
3D Printed - 100% infill ABS, ~11 grams, Material cost ~$0.25
×1
Grip - Sip/Puff Variant
3D Printed - 100% infill ABS, ~21 grams, Material cost ~$0.50
×1
Bottom_Plate
3D Printed or laser cut - 100% infill ABS, ~20 grams, Material cost ~$0.50
×1
M3-0.5 Threaded Inserts
[initeq] brand on amazon ~$0.21 each, ~$1.50 Total cost
×7
1/4-20 Threaded Insert
E-Z LOK TH-420-SV on amazon ~$0.19 each
×1
5Kg Load Cells
75mm variety, M4 mounting holes, amazon or aliexpress, ~$2.00-$7.00 each
×3
Load Cell Amplifier Modules
HX711-based, 10/60Hz rate adjustable model, ACEIRMC brand on amazon or aliexpress, ~$1.20 each
×3
Microcontroller Module
seeed studio SAMD21 XIAO, ~$5.40
×1
Controller PCB
Order from OSHpark, JLCPCB, PCBway, etc... ~$1.00-$14.00 range
×1
Pin Headers
Straight 2x7, 3x6, 3x4
×44
Pin Headers
Right Angle 2x2, 3x4
×16
Pressure Sensor Module
For Sip/Puff Grip HX710B-based, generic module, AEDIKO brand on amazon ~$2.50 each
×1
Reusable Straw w/Tip and Silicone base
Marbe Direct on amazon ~$1.25 each
×1
M4-0.7 x 20mm Flat Head Hex Socket Cap Screws
304 Stainless Steel, Eastlo on amazon, ~$0.17 each, ~$1.00 total
×6
M4-0.7 x 30mm Socket Head Screws
Reduced Shank MSM Tools Store on aliexpress, $1.25 each, $3.75 total
×4
8mmx20mm Light Load Compression Mould Die Springs
Ruibapa brand on amazon, ~$0.30 each, $0.90 total
×3
Round Neodymium Magnets
10x4mm, N52 grade justcreationus on ebay, ~$0.50 each, ~$3.00 total
×6
M3-0.5 x 8mm Hex Socket Button Head Cap Screws
PZRT brand on amazon, ~$0.14 each, ~$0.42 total
×3
M3-0.5 x 25mm Hex Socket Button Head Cap Screws
Eastlo brand on amazon, $0.15 each, $0.60 total
×4
M3-0.5 Nuts
×4
Ring Crimp Terminals
×4
Silicone Insulated Wire
×4
Thread locker compound - Removable
×1
Aquarium Rated RTV Silicone Adhesive
×1

Story

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Custom parts and enclosures

OHMni-Stick CAD

Full FreeCAD model for the OHMni-Stick

Schematics

OHMni-Stick Schematic/PCB layout

KiCad project archive for the OHMni-Stick PCB design

Code

OHMni-Stick Firmware

PlatformIO project, Arduino Framework

Credits

oneohm

oneohm

1 project • 1 follower

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