Tuesday, 11 October 2011

Market Research - What do Kids Want?


A little more grounding research..
Found this interesting interview on ABC….

A window into our technological future: what do kids want?

It’s an interview with Steve Mushkin, whose company (Latitude Insights) has been conducting research with children aged 12 and under in the US & Australia as to what they would want from the future of computing / devices…
Some of the most interesting findings are outlined in the interview; with the standouts being that kids imagined a much more physical world of computing – for example “being able to reach into the computer and touch objects” and others asking for “the computer to read their mind”….
Another really pertinent finding for me was a lot of kids anthropomorphise their computing experience – giving personality to both their devices and the internet.  They want to be able to “speak to and have friends with” their devices and software… This makes perfect sense to me as our devices integrate closer with our lifestyle, and the push for ubiquity increases.  It is the interactions with our devices that make them personal and indispensable.
This communication with devices interestingly extends to a number of kids expressing a desire to learn the language of computing, to learn to program environments and experiences (i.e games)… The possibilities afforded by the new open source robotics platforms (such as Lego Mindstorm & Vex) are beginning to bridge this gap between the virtual and physical; and providing a new arena for expression for the designers, inventors and end-users of tomorrow….


Further readings:
&c.

Monday, 10 October 2011

"Simpsons Did It"...

Rob sent me a great link just then....

Tokyo Institute of Technology Simple Personal Assistive Robot Follows You, Carrys Stuff For You

So it's been done, for sure.
But at leasr it shows theres *some* interest in the device, and possibly a market for it too (not that that is the direction intended for this project)....

Love the string guidance solution, it's so simple and neat - and such a familiar interaction (albeit not an entirely desirable one)...

Props to the Tokyo Institute of Technology..

More Grounding Research, a re-appraisal...

So after intense discussion with Andy, i realise i need to backpedal and learn the process of design also, not just the concept.

One of the key aspects i avoided was the wider audience grounding research - to really understand the audience and their desires, needs and considerations...

I started a survey to understand the community reaction to the idea, and to try and extend / repurpose / reanimate the device into something more universally useful and interesting... please, if there is any one out there that has the time it's a quickie... ten questions in ten minutes ;)

>> take the survey here <<


cheers!
&c

Friday, 9 September 2011

Grounding Research - The Presentation...

setting the scene.... stories from the bush....

rainbow serpent festival : a hotbed of experimental art and aesthetic

Robin Mutoid - Australia's anti hero - recycling & repurposing waste into  art & machine



look how far to carry the esky!!




some other examples out there.... simple, effective and functional..

this is the esky in question... 12v low amps compressor portable fridge... only 45$au!

the power train :) ford Laser wiper motors

The big, greasy box of parts.... no two of which are the same...



loyal, reliable and trustworthy.... a true friend!

Ideation: Some alternative ideas...The presentation

a.k.a "some alternative ideas"

#1....

lots of people watching movies / music on laptop, sub-optimal conditions...

why on earth would we bother???

a solution using head tracking.... and consumer parts

-failed because it was before its time, proprietary equipment and hideously expensive..


Reclaim the lanes festival... bringing it all together with radio transmitters/recievers.... communities as community..

idea #2...... 

the concepts of neuro-feedback - real designer drugs!

The technical.... NeuroSky headset~ 300$us

the possibilities.... (see original paper for references)


So its not all about the beer ;)

Preliminary Construction Sketches (will be revisited and refined)

How on earth to track a human?

Improving on a classic design? by having a large conveyor surface area the machine could go anywhere!

Friday, 2 September 2011

Grounding Research: Synthesis of Vex Design Principles

As previously promised, here is a synthesis of the Vex Inventors Guide - a basic, clear and concise introduction to the relevant engineering principles for robotics. The forum is a wealth of information also...

Apologies for the point form and brevity... but there is a lot of information in those pages, and to expand on everything would take way too much space...



>> structural
  •   rigidity
  •   centre of gravity (low and over "support polygon" pp. 2-33!)
    • weight of batteries + motors + chassis + tracks
    • weight of payload (ie carton of beer+ice)
  •  safety, bumpers etc to stop injury..
  •  stress / torsional forces / mounting points / material data sheets
    • bracing
    • suspension
  • exposure + vulnerability
Subsystem interactions:  
    
structural - motion 
  • needs to be codesigned, integrated for strength + support for integrals (motor, payload, batteries) 
  • handle rough, uneven terrain

structural - power
  • protect batteries, weight distribution  / centre of grave

structural - sensor
  • mounting and stabilising role
  • correct positioning for sensor tot work

structural - control
  • mounting and protection
  • antennae / rf shielding / range / reception

structural - logic
  • mount and protect (esp impact and h20)
  • wiring loom / connections robust and secure

               
>> motion:
  • speed vs torque
    • gearing / complexity / reliability / access to repair / maintain
    • drive gear / idler / compound gear / ratios 
  • materials for construction / durability
  • non gear, belt is better when motor and wheel is far apart
  • servo/pwm vs dc/h-bridge
    • build vs buy h-bridge or integrated chip
  • current draw (for batteries life and for motor controller integration
  • lasercut parts from cad? http://www.viz.tamu.edu/courses/tutorials/hunter/presentation1.htm
  • wheel size vs acceleration (smaller wheels = more torque)
    • stop / start of natural human gait, esp at party
    • safety, quick stop
    • more revs for regen braking etc
    • size for negotiation over obstacles (rocks, tussocks, hills)
    • clutch / stall protection (natural slip of belt?)
  • increase number of motors = cheap torque boost, but calibration..>?


motion - control - power subsystem interactions:

  • integrated microcontroller / h - bridge (sabretooth or robot claw)
    • regenerative braking / decelleration
    • regulated +5v dc for microprocessor power / protection
    • capacity / current handling capability of system matched



>> power
  • capacity + 20% (heavy contraption, never want to have to carry this beast)
  • discharge rates at full load / no load of motor / estimated Amp Hours (AH)
  • good metering / indication of low current / overcorrect  / regulation
    • possibilities of extending this with software control (similar to laptop power schemes, perhaps hack a laptop power monitor?)
  • li/po or deep cycle or motorcycle or scooter
    • shallow discharge = voltage drop
  • 5-12v or 24v (ohms law, high current/low voltage needs expensive copper) 
    • series / parallel benefits
  • ecology / green benefits of regenerative decelleration far outweighs the step outside the 'budget' construction
  • temperature 
    • batteries location within chassis 
    • heatsinking / fan for conroller


>> sensor
    eyes & ears, detect salient / important features of environment
  • reliability across all conditions expected
    • negative obstacles! cliffs, ditches
  • distance of operation / pickup polar patterns
  • analog / digital
    • analog is difficult to maintain constant / specific signal
    • digital is better for electrically 'noisy' conditions, but just hi/lo
    • combination / backup systems with different types of sensors to alleviate specific weaknesses
  • Tracking options...
    • IR proximity (pros n cons)
      • PWM for data coding (like IR remote control)
    • ultrasonic prox (see MaxBotix)
    • visibile light proximity http://letsmakerobots.com/node/1833
    • gps
      • accuracy? cheap options not hi res/fast enough updates...
    • rfid
      • signal strength (rough n ready!)
    • line detector concepts (hi/low or pattern detect ilke MS surface)
    • kinect depth mapping correlated to other sensor data (overkill, but interesting for future platforms? requires atx-mini-pc? robustness for doof?)
    • kinect mic array / positional audio capabilities (great for vox commands, could even incorporate similar tech to blob tracking code to reduce noise / predict direction)



 structure subsystem needs to accommodate all sensors
  • mount points
  • optimal operating range / dispersion / position
  • microcontroller / microprocessor handles regulated power supply (i.e BEC +5vDC supply from motor speed controllerr
  • perhaps hardwired bumper switch disconnects motors without microprocessor control for safety backup?
logic system requires cleanest data possible, with minimal processing time to make decisions quickly and accurately (necessary for following human)
audio recognition will require perhaps noise reduction / telstra technology ;)
control system will need backup (perhaps ability of manual operation in case of sensor subsystem failure) 
feedback (visual) from sensors and actuators integrated into aesthetics, but very useful for debug / troubleshooting, esp when 'back to nature' or out bush...




*phew*
-&c

Thursday, 1 September 2011

Grounding Research: Delving deeper into the machines...

Aw man, ya know i almost completely forgot to mention the afternoon i spent out west with my backpack full of tools in the westie supermarket (again, winks at Andy) known as Pick'n'Payless auto recyclers...

so i'm there, in the eve-of-the-first-day-of-spring sweating under my load of tools, climbing under the hoods of rusty and mangled cars.  Wish i had my camera, as there was so many stories there of death and destruction at high speeds... so many twisted wrecked dreams and [hopefully not] lives...

anyway... after walking the whole yard and poking around looking at the various mechanical parts and linkages, i find two identical timing cases with the perfect setup... the photo on the right is what a timing case looks like out of an engine...


However the problem i had, was all thousand of these beauties in front of me were securely buried deep in the engine and require lifting it out to get to them... all i could ever get to was a tantalising glimpse of the cogs and some beautiful belts.... but never extract them.

on the way out i tripped over two big crankshafts with the timing gear still attached... grabbing them, i dashed the hundreds of meters left to the exit and presented them with glee to the guy at the desk.. who laughed, (as i was later to find out that these parts are usually rubbish), and tried to charge me 89$au!

This was well outside the budget so i had to swallow my pride and leave empty, but greasy handed... the twenty or so engine reconditioners i visited on the way back were a real lesson in the extremes of humanity... of special special note was two individuals / small businesses - one in a mobility scooter shop (Sydney Scooter and Age Care) who went out of his way (after i told him about the idea) to try find me some super-motors, and dis-assembling half the scooters in the shop, and even pulling out his iPhone to show me all the diy projects he had done over the years :)


the other owned a engine reconditioning and machine shop by the glorious name of Unlimited Head Jobs in Ashfield.  Props to this man, a very tidy workshop, he was really interested in the robotics also and had a bucket of old parts there he just gave to me...

THANK YOU BOTH FROM THE BOTTOM OF MY HEART! YOUR CONVERSATION AND COMPANY MADE MY DAY



Show ya the best bits later ;) ....