Making Human-Machine interfaces - Log doc
9) 3d printing with electronic wires?
8) More printed capacitive sensing applications
7) Printing inductors for sensing & actuation?
5) Embedding MCU dies in fibers?
4) 3d Printing sensors with flex + conductive filaments
3) Dual Material printing initialization
2) Analysing "Fiber @ MIT" approach => plan
Idea: Some wires are made of plastics that also exist as 3d printing filament:
Fluorinated Ethylene-Propylene (FEP):
Digikey wire => 3d printing filament
Initial test:
Heat gun @ 300°C worked, the coil elements got soldered together!
Printer test with 0.6mm wire and 0.8mm nozzle:
Zoom on the extrusion mechanism:
Problem: it can't pull our 0.6mm wire => solution: custom TPU ring:
Success!
...but FEP doesn't stick:
Problem:
TODO: try again with another material...
Bending sensor:
Scale:
Fabrication tests with much more flexible filament! => real speed:
Why?
=> sensing + actuation (as in sonoflex / 25 year old patent):
How?
Measures (with the smallest):
10mm coil problems => to test:
20mm coil = OK-ish => resistance from top to bottom:
=> to test:
Exploring the integration of 3d positioning IC
=> 1st wire bonding attempt (pins were not plated):
Plasma gold plating attempt:
Still not sticky enough ;\
(more pics + videos)
...but lots of failures too:
Documentation: https://gitlab.cba.mit.edu/tools/Flashforge_Creator_Pro_2/#flashforge-creator-pro-2
1) Dual head printer bootstrap ok => dual material printing OK! (w/ conductive + flex filaments)
2a) hardware (+reference):
Heating (from injection molding) Temp. Sensor + control (for reflow oven...) => doc
2b) How To - concept
2c) video:
2d) Laser micrometer: Open CV + USB microscope => thickness => pull/draw-down speed
Draw-down Ratio:
3) Integrate LED in fiber with 1-wire interface?
Lab visit of Fiber@MIT: How to extrude multi-materials fibers? (better images)
Left: the pulling machine. Right: "pre-form" extrusions: piezo + LED fibers (see silver wires!)
Zoom on the transparent fiber (see the LED!)
Left: LED "MCU" (0.5 x 0.8 mm). Right: "maki roll" connection with MAX32660 (1.6 x 1.6 mm)
Propositions:
Questions:
Bonus: more about multi-material fiber extrusion:
Personal explorations
Capacitive (original project) Piezo-resistive (original project)
ii) Not published yet - in progress:
Mechanical approach V1 - full of wires!
iii) Not published yet - in progress:
Mechanical approach - wireless (with nRF52), for modularity:
Initial Ideas
a) General idea: making a "malleable machine" that can sense shapes, and actuate (maybe later).
These "malleable machines" will likely need to be made with machines that can make multi-material coaxial fibers (at least for the plan A).
Possible approaches:
1 dimensional modular material = enable wearable intelligence (sensing actuation)
Matrix approach for 3D sensing (x, y position + z = pressure/stretch):
a) Threads
Resi: piezoresistive coated wire for pressure sensing (paper)
Yoel Fink's group: "Fiber @ MIT": Optical fiber approach (also enables actuators)
=> The main objective!
b) Existing machines
(TODO: add updated CBA archives)
i) Simple circular knitting machine test (1st attempt = mediocre)
ii) Rope-o-matic
Better but too thick, irregular, and sloooow!
iii) Studio Hilo (video)
Smarter:
