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 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. 2
What is this Talk About ? ● A basTc TntroductTon on how to buTld a couple fun and useful devTces for your fursuTt, for cheap-Tsh. ● It focuses on the WHAT and WHY, rather than on the HOW. Want to be hands-on? Come to Flüüff 2018! ● Want to talk advanced shop? – 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… ● Want to get these slTdes? – htps://www.robocow.be/events/ 3
Content ● Cool BuTld your own sTlent fan ● LTghts StatTc and blTnkTng LEDs ● No FTre How to stay alTve to tell the story 4
Content ● Cool BuTld your own sTlent fan ● LTghts StatTc and blTnkTng LEDs ● No FTre How to stay alTve to tell the story 5
Costume Fans Markus G. Nowak Relic B. Furry Wendell Wolf TaniDaReal 6
Anatomy of a DC fan 7 http://www.ebmpapst.com/
Choosing a Quiet Fan ● Don’t buy somethTng because Tt’s Threshold of pain 130 cheap, or expensTve. ● Larger & thTcker = slower & more quTet Rock band 120 (for the same fow rate). 747 on take off ● Manufacturers have data sheets. Go and 110 Jackhammer Heavy look Tt up! truck 100 – When Tt Ts not specTfed, expect the Medium truck 90 worst. Passenger car 80 ● Compare apples to apples… Normal conversation 70 at 1 to 2m – Eg: 5 CFM ≠ 10 CFM. Suburban 60 residential neighbourhood 50 Quiet – <20 dB (@ 1 m) Ts nTce! living room 40 Quiet 30 ● Power consumptTon maters! whisper rural 20 setting 10 Threshold of hearing 0 ● OperatTng voltage convenTence: Sounds become twice as loud for every 20 dB increase. – 5V Ts handy: USB or 3/4 x AA/AAA 8
How Much Flow? ● Flow Ts what maters for comfort. ● Hard to stTck a number on: – Depends on your costume. – StatTc pressure lTmTts actually achTeved fow rate. – In free-aTr = ~0 statTc pressure. ● Just try-out (borrow) a fan wTth known specTfcatTons and make an educated guess from there. ● Help and guTde the fow: – Vent ports (eg: ears, mouth, nose) and ducts. Sunon MF40200V3-1000U-A99 Rated at 6.3 CFM – Mesh vs solTd structures. ● MultTple fans are an optTon. 9
Example: Sunon(wealth) €4,39 €4,60 €5,05 €6,07 10
Estimating Battery Run-Time ● QTck and VERY rough estTmate ● Examples (usTng a 5V 50 mA fan): – Fan load: 50 mA * 5 V = 250 mW – Batery: 800 mAh cells * 4 cells * 1.2 V (NTMH) = 3840 mWh ● 3840 mWh / 250 mW = ~15 hours – Batery: 2200 mAh USB * 1 cell * 3.7 V (LTPo) = 8140 mWh ● 8140 mWh / 250 mW = ~32 hours ● Note: USB power banks tend to gTve the mAh ratTng of the LTPo cell TnsTde, whTch Ts 3.7 V (for 1C devTces) and not 5 V. 11
Building a Fan Pack ● Choose a 5 V fan(s). ● Choose a power source. – AA/AAA/AAAA batery box. ● 3 x alcalTne (open cell ~1.65 Vmax) ● 4 x NTMH rechargable (open cell ~1.45 Vmax) ● Use a fuse as close as possTble to the batery pack! – 5 V USB power bank. ● Smallest sTze for useful autonomy and no more! ● Use a LTPo bag! ● Choose a swTtch. – In-lTne lamp cord swTtches are easy to use and tTdy. ● Use wTre-end ferrules Tn screw connectTons, not solder! – UsTng USB? Tere exTst USB cables wTth swTtch ready-made. – UsTng a batery box? Tese exTst wTth buTlt-Tn swTtches. ● FTgure-out where to put everythTng and measure wTre lengths. ● WTre red to red and black to black. Isolate everythTng wTth heat shrTnk tube. 12
Lineman’s Splice ● Solder and use heat shrTnk. ● SplTce wTll be stronger than wTres. ● BUT, there Ts a relTabTlTty Tssue: – TTn wTres aren’t strong! ● Pull forces wTll break the wTre. – Stranded wTre wTcks solder! ● JoTnts faTl to bendTng forces. ● SolutTon: use a straTn relTef. – Take the force a lTtle before/afer the splTce! – Can be as sTmple as: ● Secure Tt wTth a cable tTe. ● Sew the wTre to the fabrTc. ● Hot glue. – Te heat shrTnk also helps! 13 NASA-STD 8739.4A
Where to Get Parts and Tools? ● Local electronTcs store ● ProfessTonal maTl-order companTes (For specTfc parts, eg: the fan) ● HobbyTst webshops – DTgTkey – AdafruTt IndustrTes – Mouser – Sparkfun – Farnell/Element14 – Polulu – RS – HobbykTng – etc… – Arrow ● General e-commerce – Conrad – AlTExpress – etc… – Amazon ● BrTbe your local, frTendly – eBay electronTcs hobbyTst. – etc… 14
Content ● Cool BuTld your own sTlent fan ● LTghts StatTc and blTnkTng LEDs ● No FTre How to stay alTve to tell the story 15
Lights! SarahDee Viola Mutt – Dragonfox Unknown Unknown Primal Art Fursuits - LevantiFox 16 Kaiborg Studios - Ascii Wolfem Works TheKareliaFursuits - Gweincalar
Anatomy of a LED Wikimedia Commons – Thomas Wydra Wikimedia Commons - Inductiveload Olympus 17
Choosing a LED Furrista ● Colour – GTven by energy levels Tn the semTconductor. – Other colours use phosphorous converters or RGB mTxTng. ● IllumTnatTon Angle – Most Tn conventTonal packages are narrow. (15°- 60° typTcal) – Surface-mount types can be very wTde. (120° and 160° are common) ● BrTghtness / EfcTency – 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) ● ConsTder addTng a dTmmTng cTrcuTt for use at nTght! (eg: varTable resTstor) ● Form factor – 3 mm and 5 mm radTal leaded types are most common. – Surface-mount types Tn larger package are stTll quTte manageable. 18
Driving a Small LED ● LEDs need a constant-current source. – Current relates to brTghtness. – Too much current = boom! – Voltage to current? Just a resTstor. ● To calculate the resTstor you need: – Batery voltage (V BAT ) – LED forward voltage drop (V LED ) – LED current (I LED ) ● EquatTon: R = (V BAT - V LED ) / I LED Lumex – (5 V – 1.7 V) / 20e-3 A = 165 Ω – Nearest larger E12 value: 180 Ω – Keep the unTts consTstent! ● If you can’t fnd the data sheet: – V LED depends ~only on the colour. – Normal max. drTve current Ts ~20 mA ● HTgh-efcTency types wTll requTre less, hTgh-power types more. 19 – Too brTght? Use a lower current. http://www.electronics-tutorials.ws/diode/diode_8.html
Lumex LED Chart 20
Driving Many LEDs the Simple Way: Digital LED Strips or LED Pixels ● Full dTgTtal, sofware control over each “pTxel” (RGB LED) colour and brTghtness. ● No need to buTld a control cTrcuTt or wTre all the LEDs yourself. ● To make Tt work: – Connect a 5 V supply. (Check thTs!) ● Careful that Tt has enough power! – Connect your favourTte mTcrocontroller to the dTgTtal lTnes. – Download a suTtable support lTbrary. (Buy a strTp that has one!) – ModTfy and program an example. ● Arranged Tn a matrTx, these could dTsplay sTmple anTmatTons. (E.g.: wTnkTng smTley face.) https://www.adafruit.com/ 21
Control: Arduino and the Likes ● For dynamTc efects you need a programmable controller. ● Tere are many easy-to-use optTons today. – ArduTno / Teensy – Raspberry PT ● Just go out, buy a good starter kTt, and go! ● Caveat emptor: 5V vs 3.3V logTc levels! (StTck wTth 5V when startTng-out.) https://www.arduino.cc/ 22
Some Optical Tricks ● For more even LED lTghtTng ● Complex shapes wTth a decal – Run multTple LED strTps Tn – PrTnt on overhead projector parallel, wTth a half LED transparency flm. Or cut pTtch ofset, for larger areas. out a shape from some – Use an optTcal dTfuser opaque materTal. ● PrTvacy wTndow flm. – A dTfuse lTght source wTll ● TTn, translucent foam. make a bTg dTference. ● Frosted plexTglass. – Idea: glowTng tatoo under ● Real dTfuser flm. fur! 23
Some Optical Tricks ● For tTny poTnts of lTght ● For glowTng lTnes – 1 mm plastTc optTcal fbre (POF) Ts – STde-emTtTng fbre Ts TnexpensTve. TnexpensTve. (about €1/m on AlTExpress) – JoTn several strands to a brTght LED, – Small lTght engTne (3 W) Ts also cheap. or use a real lTght engTne drTver (€5 on AlTExpress) module. – Much easTer to use and far more robust – Feed the other ends to where you than EL (electro-lumTnescent) wTre. want lTghts. Also: no hTgh-voltage. – Jacketed and non-jacketed POF exTsts. – Idea: glowTng lTne art on your suTt! – Idea: glowTng whTsker tTps! 24
Content ● Cool BuTld your own sTlent fan ● LTghts StatTc and blTnkTng LEDs ● No FTre How to stay alTve to tell the story 25
The Costume Environment... ● Is a harsh mTstress Tndeed! – Constant motTon. – Regular hTgh-velocTty Tmpacts. – Lots of wTre fexTng. – HTgh humTdTty. ● Here are some tTps to Tmprove safety! 26
Costuming Safety ● Te rTsks (non-exhaustTve) dTscussed Tn thTs sectTon: – ElectrocutTon – FTre – MechanTcal 27
Costuming Safety ● Te rTsks (non-exhaustTve) dTscussed Tn thTs sectTon: – ElectrocutTon – FTre – MechanTcal 28
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