Silly Electronics for Fun and Absolutely no Proft v2.0 Nordic - - PowerPoint PPT Presentation
Silly Electronics for Fun and Absolutely no Proft v2.0 Nordic Fuzzcon 2018 02/03/2018 Floere T. Pillowcase, Devourer of Automobiles (foere@robocow.be) Disclaimer TTs presentatTon Ts Tntended for educatTonal purposes only and does not
Silly Electronics for Fun and Absolutely no Proft v2.0
Nordic Fuzzcon 2018 – 02/03/2018
Floere T. Pillowcase, Devourer of Automobiles (foere@robocow.be)
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Disclaimer
TTs presentatTon Ts Tntended for educatTonal purposes only and does not replace Tndependent professTonal judgement. Te presenter, nor the conventTon, nor RoboCow IndustrTes assume any responsTbTlTty for the content, accuracy or completeness of the TnformatTon presented.
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What is this Talk About ?
for your fursuTt, for cheap-Tsh.
to be hands-on? Come to Flüüff 2018!
– Come joTn the room party! (R1609, 16:30) – It’s about my R&D Tn lTve voTce and expressTon-mTmTckTng
anTmatronTcs.
– And whatever else comes-up…
– htps://www.robocow.be/events/
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Content
BuTld your own sTlent fan
StatTc and blTnkTng LEDs
How to stay alTve to tell the story
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Content
BuTld your own sTlent fan
StatTc and blTnkTng LEDs
How to stay alTve to tell the story
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Costume Fans
Wendell Wolf Relic B. Furry TaniDaReal Markus G. Nowak
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Anatomy of a DC fan
http://www.ebmpapst.com/
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Choosing a Quiet Fan
cheap, or expensTve.
(for the same fow rate).
look Tt up!
– When Tt Ts not specTfed, expect the
worst.
– Eg: 5 CFM ≠ 10 CFM. – <20 dB (@ 1 m) Ts nTce!
– 5V Ts handy: USB or 3/4 x AA/AAA
Sounds become twice as loud for every 20 dB increase.
Threshold of pain 747 on take off Jackhammer Rock band Heavy truck Medium truck Passenger car Normal conversation at 1 to 2m Quiet living room whisper Threshold of hearing Quiet rural setting Suburban residential neighbourhood 10 20 30 40 50 60 7080 90
100
110
120
130
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How Much Flow?
– Depends on your costume. – StatTc pressure lTmTts actually
achTeved fow rate.
– In free-aTr = ~0 statTc pressure.
known specTfcatTons and make an educated guess from there.
– Vent ports (eg: ears, mouth, nose)
and ducts.
– Mesh vs solTd structures.
Sunon MF40200V3-1000U-A99 Rated at 6.3 CFM
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Example: Sunon(wealth)
€6,07 €4,60 €4,39 €5,05
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Estimating Battery Run-Time
– Fan load: 50 mA * 5 V = 250 mW – Batery: 800 mAh cells * 4 cells * 1.2 V (NTMH) = 3840 mWh
– Batery: 2200 mAh USB * 1 cell * 3.7 V (LTPo) = 8140 mWh
TnsTde, whTch Ts 3.7 V (for 1C devTces) and not 5 V.
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Building a Fan Pack
– AA/AAA/AAAA batery box.
(open cell ~1.65 Vmax)
– 5 V USB power bank.
– In-lTne lamp cord swTtches are easy to use and tTdy.
– UsTng USB? Tere exTst USB cables wTth swTtch ready-made. – UsTng a batery box? Tese exTst wTth buTlt-Tn swTtches.
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Lineman’s Splice
– TTn wTres aren’t strong!
– Stranded wTre wTcks solder!
– Take the force a lTtle before/afer
the splTce!
– Can be as sTmple as:
– Te heat shrTnk also helps!
NASA-STD 8739.4A
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Where to Get Parts and Tools?
– AdafruTt IndustrTes – Sparkfun – Polulu – HobbykTng – etc…
– AlTExpress – Amazon – eBay – etc…
(For specTfc parts, eg: the fan)
– DTgTkey – Mouser – Farnell/Element14 – RS – Arrow – Conrad – etc…
electronTcs hobbyTst.
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Content
BuTld your own sTlent fan
StatTc and blTnkTng LEDs
How to stay alTve to tell the story
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Lights!
Kaiborg Studios - Ascii Viola Mutt – Dragonfox Wolfem Works Primal Art Fursuits - LevantiFox TheKareliaFursuits - Gweincalar Unknown Unknown SarahDee
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Anatomy of a LED
Olympus Wikimedia Commons - Inductiveload Wikimedia Commons – Thomas Wydra
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Choosing a LED
– GTven by energy levels Tn the semTconductor. – Other colours use phosphorous converters or RGB mTxTng.
– Most Tn conventTonal packages are narrow. (15°- 60° typTcal) – Surface-mount types can be very wTde. (120° and 160° are common)
– Amount of lTght for a gTven current (say, 20 mA) varTes wTdely. – More efcTent = fewer devTces needed and longer batery lTfe. – BrTghter = vTsTble under more lTghtTng condTtTons (eg: durTng the day)
– 3 mm and 5 mm radTal leaded types are most common. – Surface-mount types Tn larger package are stTll quTte manageable.
Furrista
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Driving a Small LED
– Current relates to brTghtness. – Too much current = boom! – Voltage to current? Just a resTstor.
– Batery voltage (VBAT) – LED forward voltage drop (VLED) – LED current (ILED)
– (5 V – 1.7 V) / 20e-3 A = 165 Ω – Nearest larger E12 value: 180 Ω – Keep the unTts consTstent!
– VLED depends ~only on the colour. – Normal max. drTve current Ts ~20 mA
hTgh-power types more.
– Too brTght? Use a lower current.
http://www.electronics-tutorials.ws/diode/diode_8.html Lumex
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Lumex LED Chart
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Driving Many LEDs the Simple Way: Digital LED Strips or LED Pixels
“pTxel” (RGB LED) colour and brTghtness.
all the LEDs yourself.
– Connect a 5 V supply. (Check thTs!)
– Connect your favourTte mTcrocontroller
to the dTgTtal lTnes.
– Download a suTtable support lTbrary.
(Buy a strTp that has one!)
– ModTfy and program an example.
sTmple anTmatTons. (E.g.: wTnkTng smTley face.)
https://www.adafruit.com/
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Control: Arduino and the Likes
programmable controller.
– ArduTno / Teensy – Raspberry PT
kTt, and go!
logTc levels! (StTck wTth 5V when startTng-out.)
https://www.arduino.cc/
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Some Optical Tricks
– Run multTple LED strTps Tn
parallel, wTth a half LED pTtch ofset, for larger areas.
– Use an optTcal dTfuser
– PrTnt on overhead projector
transparency flm. Or cut
– A dTfuse lTght source wTll
make a bTg dTference.
– Idea: glowTng tatoo under
fur!
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Some Optical Tricks
– 1 mm plastTc optTcal fbre (POF) Ts
TnexpensTve.
– JoTn several strands to a brTght LED,
module.
– Feed the other ends to where you
want lTghts.
– Jacketed and non-jacketed POF exTsts. – Idea: glowTng whTsker tTps!
– STde-emTtTng fbre Ts TnexpensTve.
(about €1/m on AlTExpress)
– Small lTght engTne (3 W) Ts also cheap.
(€5 on AlTExpress)
– Much easTer to use and far more robust
than EL (electro-lumTnescent) wTre. Also: no hTgh-voltage.
– Idea: glowTng lTne art on your suTt!
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Content
BuTld your own sTlent fan
StatTc and blTnkTng LEDs
How to stay alTve to tell the story
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The Costume Environment...
– Constant motTon. – Regular hTgh-velocTty Tmpacts. – Lots of wTre fexTng. – HTgh humTdTty.
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Costuming Safety
Tn thTs sectTon:
– ElectrocutTon – FTre – MechanTcal
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Costuming Safety
Tn thTs sectTon:
– ElectrocutTon – FTre – MechanTcal
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Electrocution
faulty external devTce.
– No maTns-powered energy source Ts allowed whTle wearTng the costume.
Tus, no adapters, chargers, lab power supplTes, etc…
– NothTng may be connected to anythTng that Ts not exclusTvely batery
powered Ttself and Tsolated from outsTde systems.
– No electrTcal connectTons to outsTde systems (such as phone lTnes, network
cables, audTo/vTdeo systems, etc…) are allowed.
– If you need to send audTo to the DJ/PA system, use a wTreless approach (e.g.
Bluetooth), or just hold a mTcrophone.
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Costuming Safety
Tn thTs sectTon:
– ElectrocutTon – FTre – MechanTcal
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Fire
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Fire
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Electrical Fire
– Components can overheat and burn, even at low currents. – WTres can overheat and cause theTr TnsulatTon to catch fre. – SparkTng Ts also possTble.
– Batery fuses go rTght at the batery, to protect the wTrTng from catchTng fre.
– Use connectors wTth shells. – Enclose your electronTcs Tn project boxes. – Use structural supports to keep costume materTals away from electrTcal parts. – Install non-combustTble and thermally-TsolatTng layers Tf necessary.
– Use heat shrTnk to Tsolate thTngs. – Make proper wTre joTnts. (Soldered “lTneman splTce”, double layer heat shrTnk.) – Use materTals rated for the Tntended use. (Observe current ratTngs, voltage ratTngs, etc…)
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Sizing a Fuse
– Don’t randomly pTck a fuse. – Read manufacturer’s guTdes! (Eg: LTtlefuse’s
“Fuseology” Ts a brTef TntroductTon.)
and may not even blow.
– Te tTme-current curve shows thTs. – But don’t go to close to the edge eTther. Te
fuse wTll wear too fast.
the current to blow the fuse!
– For loads that don’t have a large Tnrush
current (LEDs, most DC fans), sTze the fuse about 2 x your maxTmum load current, and pTck a slow or fast type.
– Make sure that your source can stTll blow
the fuse Tn a reasonable tTme.
Littlefuse
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Fire
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Battery Fire
– HTgh short-cTrcuTt currents cause fre, batery over-heatTng. – Hot chemTcals can vent out, or result Tn a chemTcal fre. – H2 Ts a common by-product of overheatTng cells…
– MechanTcally protect the cells and never open them!
– Only use protected cells, and shTeld them from mechanTcal harm. – If LTPo has to be used, good qualTty USB power banks are Much preferred.
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Battery Fire
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Abusing a LiPo Pack
– “LTpo Safe ChargTng and Storage Bag”
htps://www.youtube.com/watch?v=hcwOwf55Rtc
– “Standard LTPo Guard vs. YUKI Model LTPo Guard B1
(Test #002)”
htps://www.youtube.com/watch?v=qQldY7fKn5o
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Fire
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Materials Flammability
– Nylon, polyester, polycoton, polyurethane or latex foam, resTns, glues, ... – Many have large surface areas (TmTtatTon fur, feece).
– Some emTt toxTc fumes. – Many also melt. → TTs Ts very bad news for burn wounds!
– Tey make the fre self-extTnguTsh and keep Tt from spreadTng.
– One practTcal way: test each materTal wTth a gas (butane/propane) torch. (OutsTde,
and have means to extTnguTsh a fre at hand.)
– Te fre should stop when the fame Ts removed. (Self-extTnguTshTng behavTour.) – Best to test samples of all the materTals used.
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Materials Flammability
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– “SetTngs FTre To Faux (Fur) - Dr. Faux Tests Fur vs
FTre”
htps://www.youtube.com/watch?v=UvTpL_6m9-0
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Polyurethane and Synthetic Latex Foam – On Fire
– “Flame Retardant Reduces FlammabTlTty of
Upholstered FurnTture”
htps://www.youtube.com/watch?v=mgdWQYl5ZVc
– “SynthetTc Latex and Natural Latex Blends are
HTghly Flammable”
htps://www.youtube.com/watch?v=SWuxLIuPZ0U
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Materials Flammability
– Good qualTty fur appears properly fame retardant. – Cheap fur defnTtely Ts not! – Foams are a problem. You must defnTtely test the foam Tn your
costume!
– Tey burn and melt Tnto your skTn. – Buy Nomex (and sTmTlar materTals)! – Go shop at motor sports places, they
have thTs stuf for drTver fre safety.
Tere Ts some tTme to extTnguTsh or escape.
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Fire
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Escapability
up TnsTde the costume. Now what?
– Access to fresh aTr! (removable head pTece?) – QTck egress from the costume!
rTpable seams, etc…
(E.g.: wTngs.)
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Fire
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Fire Fighting
– Small, rechargable LTPo batery fres can be extTnguTshed wTth water. – Most of the other materTals are also readTly extTnguTsh wTth water.
– STOP – DROP – ROLL – Do not run! You may have to brTng a person to the ground Tf they are panTckTng and runnTng
(leg sweep).
– Have the usual fre fghtTng devTces on hand:
wTth sterTle coton.
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Costuming Safety
Tn thTs sectTon:
– ElectrocutTon – FTre – MechanTcal
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Mechanical
and your audTence! MTnd tTny, curTous fngers!
– Forces can be hTgh, edges sharp…
axles / fans.
fall-down Tn your suTt. Is there anythTng that can Tmpale anyone? (E.g.: screws, horns, claws, spTkes, etc…)
wTres, ropes, etc…)
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Costuming Safety in One Line:
Yes, that is Comic Sans. Got your attention, didn’t it?
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The End!
frontTer and see some actual R&D?
– JoTn the room party startTng as soon
as I get there! (Room 1609)