Does anyone know how to make ripstop nylon water repellent-without the expense of buying a commercial product?

Am trying to construct some dual purpose- outdoor furniture and camping gear-but the only fabric that I have hand is not water repellent. I would appreciate any ideas.

Question by hiddenartist 7 years ago  |  last reply 7 years ago


new to arduino, want to run a dual display for 2 sensors

I'm new to the Arduino community.  wanting to set up a dual radar setup with 2 ultrasonic sensors,  (Ultrasonic Sensor Module HC-SR04), and outputting to a pair of 7 segment displays ( two 7 segment displays each).  I've found a code to do a single could use a lot of help to output two at the same time, basically 2 lanes without 2 units.  im using an arduino mega, ordered a unor3 and hopefully it can be made to run on one or the other. code is as follows: /* HC-SR04 Sensor    The circuit:     * VCC connection of the sensor attached to +5V     * GND connection of the sensor attached to ground     * TRIG connection of the sensor attached to digital pin 2     * ECHO connection of the sensor attached to digital pin 4  */    /*  This is a radar ping sensor that calcultates the speed of an  object traveling away or towards the sensor. I took some of this  code for the HC-SR04 Sensor implementation by Tautvidas Sipavicius. The rest  is original code from me. I know that the seven segment display  code is not the best to look at or the most optimized but it  serves its purpose just fine and is easy to understand.    Written by Matthew Ladd  */   const int trigPin = 2; const int echoPin = 4;   void setup() {   // initialize serial communication:   Serial.begin(9600);   //First 7 segment (ones place)   pinMode(30,OUTPUT);//F   pinMode(31,OUTPUT);//G   pinMode(32,OUTPUT);//E   pinMode(33,OUTPUT);//D   pinMode(34,OUTPUT);//C   pinMode(35,OUTPUT);//B   pinMode(36,OUTPUT);//A   //Second 7 segment (tens place)   pinMode(37,OUTPUT);//F   pinMode(38,OUTPUT);//G   pinMode(39,OUTPUT);//E   pinMode(40,OUTPUT);//D   pinMode(41,OUTPUT);//C   pinMode(42,OUTPUT);//B   pinMode(43,OUTPUT);//A } void zerofirst(){   digitalWrite(30,LOW);   digitalWrite(31,HIGH);   digitalWrite(32,LOW);   digitalWrite(33,LOW);   digitalWrite(34,LOW);   digitalWrite(35,LOW);   digitalWrite(36,LOW); } void onefirst(){   digitalWrite(30,HIGH);   digitalWrite(31,HIGH);   digitalWrite(32,HIGH);   digitalWrite(33,HIGH);   digitalWrite(34,LOW);   digitalWrite(35,LOW);   digitalWrite(36,HIGH); } void twofirst(){   digitalWrite(30,HIGH);//F   digitalWrite(31,LOW);//G   digitalWrite(32,LOW);//E   digitalWrite(33,LOW);//D   digitalWrite(34,HIGH);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void threefirst(){   digitalWrite(30,HIGH);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void fourfirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,HIGH);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,HIGH);//A } void fivefirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,HIGH);//B   digitalWrite(36,LOW);//A } void sixfirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,LOW);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,HIGH);//B   digitalWrite(36,LOW);//A } void sevenfirst(){   digitalWrite(30,HIGH);//F   digitalWrite(31,HIGH);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,HIGH);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void eightfirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,LOW);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void ninefirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,HIGH);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void zerosecond(){   digitalWrite(37,LOW);   digitalWrite(38,HIGH);   digitalWrite(39,LOW);   digitalWrite(40,LOW);   digitalWrite(41,LOW);   digitalWrite(42,LOW);   digitalWrite(43,LOW); } void onesecond(){   digitalWrite(37,HIGH);   digitalWrite(38,HIGH);   digitalWrite(39,HIGH);   digitalWrite(40,HIGH);   digitalWrite(41,LOW);   digitalWrite(42,LOW);   digitalWrite(43,HIGH); } void twosecond(){   digitalWrite(37,HIGH);//F   digitalWrite(38,LOW);//G   digitalWrite(39,LOW);//E   digitalWrite(40,LOW);//D   digitalWrite(41,HIGH);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void threesecond(){   digitalWrite(37,HIGH);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void foursecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,HIGH);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,HIGH);//A } void fivesecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,HIGH);//B   digitalWrite(43,LOW);//A } void sixsecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,LOW);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,HIGH);//B   digitalWrite(43,LOW);//A } void sevensecond(){   digitalWrite(37,HIGH);//F   digitalWrite(38,HIGH);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,HIGH);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void eightsecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,LOW);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void ninesecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,HIGH);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } long distanceOverTime(long first,long second){  return ((first-second)/.1)*.0223693629;//taking cm/s to mph } long holder;//store the cm from last time through loop. long temp;//used to store the speed value after changes int counter; void loop() {   // establish variables for duration of the ping,   // and the distance result in inches and centimeters:   long duration, inches, cm;   int tens;   int ones;   long Speed;   // The sensor is triggered by a HIGH pulse of 10 or more microseconds.   // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:   pinMode(trigPin, OUTPUT);   digitalWrite(trigPin, LOW);   delayMicroseconds(2);   digitalWrite(trigPin, HIGH);   delayMicroseconds(10);   digitalWrite(trigPin, LOW);     // Read the signal from the sensor: a HIGH pulse whose   // duration is the time (in microseconds) from the sending   // of the ping to the reception of its echo off of an object.   pinMode(echoPin, INPUT);   duration = pulseIn(echoPin, HIGH);     // convert the time into a distance   inches = microsecondsToInches(duration);   cm = microsecondsToCentimeters(duration);   Speed=distanceOverTime(holder,cm);   holder=cm;//after speed caclulation so take the cm value for another calculation   Speed=abs(Speed);   if(Speed!=0 || counter==10){     temp=Speed;     counter=0;   }else{     counter++;   }   if(temp>=100){    zerofirst();    zerosecond();   }else{     ones=temp%10;     tens=temp/10;   }   if(ones == 0){     zerofirst();   }else if(ones==1){     onefirst();   }else if(ones==2){     twofirst();   }else if(ones==3){     threefirst();   }else if(ones==4){     fourfirst();   }else if(ones==5){     fivefirst();   }else if(ones==6){     sixfirst();   }else if(ones==7){     sevenfirst();   }else if(ones==8){     eightfirst();   }else if(ones==9){     ninefirst();   }   if(tens == 0){     zerosecond();   }else if(tens==1){     onesecond();   }else if(tens==2){     twosecond();   }else if(tens==3){     threesecond();   }else if(tens==4){     foursecond();   }else if(tens==5){     fivesecond();   }else if(tens==6){     sixsecond();   }else if(tens==7){     sevensecond();   }else if(tens==8){     eightsecond();   }else if(tens==9){     ninesecond();   }       Serial.print(inches);   Serial.print(" in, ");   Serial.print(cm);   Serial.print(" cm, ");   Serial.print(Speed);   Serial.print(" mph");   Serial.println();     delay(100); }   long microsecondsToInches(long microseconds) {   // According to Parallax's datasheet for the PING))), there are   // 73.746 microseconds per inch (i.e. sound travels at 1130 feet per   // second).  This gives the distance travelled by the ping, outbound   // and return, so we divide by 2 to get the distance of the obstacle.   // See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf   return microseconds / 74 / 2; }   long microsecondsToCentimeters(long microseconds) {   // The speed of sound is 340 m/s or 29 microseconds per centimeter.   // The ping travels out and back, so to find the distance of the   // object we take half of the distance travelled.   return microseconds / 29 / 2; } again, all your help and thought are appricated

Topic by herb1977 1 year ago  |  last reply 1 year ago


Need a cheap dual-output, center tapped, 180VA 18V 5A transformer?

I am trying to design a nice dual-rail lab power supply and need a cheap dual-output, center tapped, 180VA 18V 5A transformer. The outputs are as follows: Primary: 120V Secondary 1:  9V-0-9V, @ 5A max. Secondary 2:  9V-0-9V, @ 5A max. ======================OR==================== Primary 120V Secondary 1:  9V, @ 5A max. Secondary 2:  9V, @ 5A max. Secondary 3:  9V, @ 5A max. Secondary 4:  9V, @ 5A max. I prefer a transformer for the linear regulator over a switching preregulator, because a switching preregulator sort of defeats the whole purpose of making a nice, high precision, low-noise lab instrument. However, I also prefer to have more than just 2 separate 18V outputs, since that means when the output is shorted and constant current mode kicks in for either the positive or negative rail, I will have a voltage drop of 18V, at a maximum current of 5A, and thats over 90W of power dissipation!!! I think that I can deal with that if thats the only solution, since I am planning on using a large CPU active heatsink for cooling, but I prefer if I was not pushing a TO-247 device to it's thermal limits. I have found this: http://www.antekinc.com/as-2218-200va-18v-transformer/ It is affordable, but it seems strangely cheaper than a lot of other toroidal Xformers on the market. Also, the 2 primaries are not center tapped. It is 200VA though! I have never heard of that company, and it seems like the description of it is written in chinglish. They act like the fact that they over-engineered and under-specced it is a feature (to me, thats how all ratings should be, that should be normal and standard, not a feature.). I have also found this: http://www.digikey.com/product-detail/en/36-6/36-6-ND/1984766 It would be perfect, but it is $80!!! Very expensive, Also, I do not think it is a nice toroidal transformer, not that that matters much to be, I just like the professional look of a beefy toroidal transformer inside a power supply. Lastly, I have found this: http://www.mouser.com/ProductDetail/Hammond-Manufacturing/1182G18/?qs=sGAEpiMZZMvwUzoUXIIvySPCJQuQgm7bYNfLdl9rdUYluBT2%2f%252bFqzw%3d%3d It seems to be very similar to the first find, and it is from a reputable distributor. At $70 it is still expensive, and I do not want to spend over $100 for a homemade power supply. I would just get a off-the-shelf solution for that! What about the possibility of modifying a MOT transformer? How many VA or watts can I expect from the output without active cooling? I know they are rated from upwards to 1000W, but I also know they cannot sustain that power output for a long time without overheating and requiring lots of active cooling, and from what I remember, I believe the core is really being pushed into saturation during normal operation, leading to LOTS of power loss in the transformer core, but can they output 180VA continuously and effectively? Approximately how many turns of wire would I need to achieve my requirements, and what gauge wire should I use? I am thinking 20AWG but someone who has done that before would know better than me.

Question by -max- 4 years ago  |  last reply 4 years ago


First Motorcycle, budget

Hi. I've recently been hooked on motorcycles. I'd love to get one and start riding and working on one. There are a few problems. First off, I'm only 13 years old, but I'm 5'11" and 160 lbs. I know that it's illegal for me to ride a motorcycle, and I'm not even sure if I can take a mfs course at this age. I wouldn't be riding on any big roads, and would barely even ride it, besides riding it to my best friends house (he'd help me work on it, his dad is into bikes, and he only lives a few miles away), and around a few back roads in my neighborhood. My dad has been riding motorcycles for before I was born, and has multiple types and sizes of bikes (he has a touring Harvey, I believe it's a VRSC, a ninja 600, and a dirt bike which I don't know the model of). He could teach me and show me how to properly ride a motorcycle. Also, I don't know what kind of bike to get. I've heard dual purpose bikes are good for starters, but I really have no idea where to start. I'd appreciate input. Preferably it'd be a bike that I could work on and modify/upgrade as I go along. Thirdly, is price. I don't really know my exact budget, but it'd be around $600-$700. I know it's barely anything, but I'd have to pay for the bike myself, and that's all I have. If it's even possible to purchase a bike at this price point, it doesn't even have to run, I'd love your input. Ideally I'd like to keep everything to the absolute bare minimum, as cheap as possible. My dad already has safety gear, and I could borrow it if I rode my bike.  Again, thanks for your input, and any and all suggestions will be greatly appreciated. 

Topic by IvanT3 3 years ago  |  last reply 3 years ago


How to control a dc motor/ pump to rotate in both directions for transferring a liquid from one bottle to another?

I want to control a dc motor / pump to make it rotate in both directions such that I can transfer water in a certain bottle to another making the motor work as a pump and then re transfer the water back to the original container. ie basically a to and fro motion of water between two containers.  Constraint is that only one motor can be used for the purpose. The main disadvantage with this is that I am not able to transfer water to and fro in both direction using the same water channel.  I am planing to use an arduino micro controller for controlling the motor switching. 

Question by HarigovindM 3 years ago  |  last reply 3 years ago


Vertically Adjustable TV Wall Mount

I am in need of a vertically adjustable wall mount that would hold a 32" LCD TV and raise/lower the tv with 12-24" of travel. I live in an apartment and am on a tight tight tight budget, so I am trying to dual purpose a TV to be both computer monitor and bedroom television. My problem is that when the TV is sitting on the desk, I have to look between my feet to see it from the bed. It just isn't comfortable viewing. If I were to mount it at proper viewing height from the bed, I would be craning my neck to see it. I have scoured the internet and the only mounts they make like this are as expensive as another TV.  I am a novice at this kind of thing, so the simpler and cheaper the better. If I could mount some sort of track to the wall and use a heavy pin to set the height or something like that, that would be an idea. Any help would be much appreciated! Thank you,  Sean

Topic by SlyBlackDragon 4 years ago  |  last reply 4 years ago


Art as an investment vehicle.

I find it hard to say anything nice about the The Artist's Pension Trust (via the BBC) and I'm finding it equally difficult to completely denounce it. I suppose many of my misgivings may have more to do with the general state of art within contemporary culture than with the trust itself. Anyway, decide for yourself at their official homepage. Or just take the New York Times' word that the Artist's Pension Trust is infused with "a healthy dose of socialism.""Such informal trading systems, where young artists swap their own work for art made by others, has always served this dual purpose of combining pleasure with diversified financial security. The idea is that at least one of the group will become a recognised and valued artist, and as such a broad arts portfolio is likely to contain at least one valuable work of art. Now, a multilingual globetrotting financier has formalised the system, making a quantum leap in the process, in the form of the Artist Pension Trust." -- BBCHowever, if you really want to make a good investment, let the BBC show you How to Spot a Banksy for fun and profit.

Topic by randofo 11 years ago  |  last reply 11 years ago


Photo Challenge: Take a Photo Everyday in January

---------------------------------------- ---------------------------------------- PLEASE READ THIS THREAD!!!! ---------------------------------------- ---------------------------------------- With the New Year comes New Year's Resolutions, and one of my on-going resolutions is to improve my photography skills.  I have a hunch I'm not the only one who wants to be a better photographer, so I would like to pose a challenge in which I will also participate. The Challenge: Take a photograph everyday in January. The Reward: Bragging rights and a fancy patch to show everyone that you successfully completed the challenge. Simple, right?  It doesn't have to be the best photo EVAR.  It doesn't have to be beautifully lit.  It doesn't need perfect composition.  It just has to be the very simple act of picking up your camera, taking a shot, and posting it online.  It can even be a photo you're going to use in an Instructable, a dual purpose photograph.  The trick is that it has to be done every day.  No old photos.  No rehashes.  This is for personal improvement and making photography a habit. Now I realize that not everyone will be able or willing to do this everyday because stuff happens.  If you can take a photo for 20 days in January, you will get a patch.  If you can manage to take a new photo every single day, all 31, in January, you will get a very special patch! If you would like to participate in this challenge, leave a reply to this topic saying that you accept the challenge.  As you submit your photos, reply to your original acceptance reply.  This will keep things a bit tidier, and you will be able to see your accomplishments altogether.  There's a great deal of satisfaction in seeing a big chunk of what you've done and feeling motivated to do more.  If you would like to see an example of how to submit photos for the challenge, please look for my acceptance comment on this topic and how I reply to that comment with photos I am submitting. Alternatively, you can submit links to images on your Flickr, Picasa, DeviantArt, and other image sharing services.  This will save on bandwidth usage on Instructables.  Please do not submit links to private accounts such as Facebook and Myspace.  The images must be publicly viewable without requiring a linked account. There are some mighty fine Instructables on photography, so you might want to take a look around.  Hopefully, by taking part in this challenge, you will not only improve your photography skills but your Instructables as well.  You might even be motivated to post an Instructable about photography in January! If you would like to participate in a much larger challenge, check out Project365. So here's to a Happy (and productive) New Year!

Topic by AngryRedhead 8 years ago  |  last reply 8 years ago


Something from Nothing: Films on Design & Architecture

If you're interested in Yerba Buena Center for the Arts' TechnoCRAFT exhibition, you might also want to know about the design film series we're hosting this summer.  See below for more information. SOMETHING FROM NOTHING: FILMS ON DESIGN & ARCHITECTURE Sundays, Jul 11 thru Sep 5, 2 pm In conjunction with our TechnoCRAFT gallery exhibition, we present these eight matinee screenings, covering not only design, but architecture, motion graphics and craft. Sun, Jul 11, 2 pm Refrigerator Fetish: Vintage Industrial Design Films We kick off the series with a selection of funny, bizarre, and maybe even educational vintage product design films, from the 1920s forward. Examining the sensuality of the fridge, the rhapsody of the pencil and the mysterious polishing of unknowable objects, this promises to be a one-of-a-kind day at the movies. Presented live by film archivist Dennis Nyback. Sun, Jul 18, 2 pm Citizen Architect: Samuel Mockbee and the Spirit of the Rural Studio By Sam Wainwright Douglas Citizen Architect chronicles the work of the late activist architect Samuel Mockbee, and his radical educational program known as the Rural Studio. The program teaches students about the social responsibilities of architecture and charges them to provide original and inspirational homes and buildings (mostly from salvaged materials) in rural west Alabama, one of the poorest communities in the country (2010, 60 min, digital video). Preceded by the short Robin Hood Gardens (Or Every Brutalist Structure For Itself) by Martin Ginestie (2010, 17 min, digital video) Sun, Jul 25, 2 pm wow+flutter Assembled by onedotzero, the London-based cutting-edge new media group, this compilation program showcases the most progressive and unpredictable work in motion graphics and short-form media. Fresh talent and celebrated masters alike strive to expand, blur and explode traditional notions of what future moving images could be as a playground for creative expression. (2009, 70 min, digital video) Sun, Aug 1, 2 pm The Greening of Southie By Ian Cheney This incisive new documentary is set in the traditionally Irish-American working-class neighborhood of South Boston, where a new kind of building is taking shape. From wheatboard cabinetry to recycled steel, bamboo flooring to dual-flush toilets, the Macallen building is a leader in the emerging field of environmentally friendly design. But Boston's steel-toed union workers aren't sure they like it. And when things start to go wrong, the young development team gets a little more than they bargained for. A film about building the city of tomorrow…today. (2008, 72 min, digital video) Sun, Aug 15, 2 pm Infinite Space: The Architecture of John Lautner By Murray Grigor John Lautner was the Southern California architect. Even if his name isn’t familiar, you have likely seen pictures of some of his most famous works, such as the space-age “Chemosphere,” the octagonal house on a hill, which has become a Los Angeles landmark. Lautner believed that the purpose of architecture is to create timeless, free, joyous spaces for all activities in life. Infinite Space traces the lifelong quest of a man to create “architecture that has no beginning and no end.” (2009, 90 min, digital video) Sun, Aug 22, 2 pm Rem Koolhaas: A Kind of Architect By Markus Heidingsfelder and Min Tesch Rarely has an architect caused as much sensation outside of the architecture community as Rem Koolhaas. His outstanding creations such as the Dutch Embassy in Berlin, the Seattle Library, and the Casa da Musica concert hall in Porto are working examples of his visionary theories about architecture and urban society. An engaging portrait of the man and his work, the film takes us to the heart of his ideas. Koolhaas has stated "it's the only film about me that I have liked." (2008, 97 min, digital video) Sun, Aug 29, 2 pm The Visual Language of Herbert Matter By Reto Caduff SPECIAL SNEAK PREVIEW! A revealing look at the life story of a highly influential mid-century modern design master. Known as a quintessential designer's designer, Swiss-born Herbert Matter is largely credited with expanding the use of photography as a design tool and bringing the semantics of fine art into the realm of applied arts. Through never-before-seen footage, personal photography and stunning graphic design, the film explores the social and cultural impact of his personal visual language that influenced a generation of designers and artists. (2010, digital video) Sun, Sep 5, 2 pm Handmade Nation By Faythe Levine This charmingly low-fi film documents the contemporary crafting community. These artists, crafters and designers marry historical techniques, punk and D.I.Y ethos while being influenced by traditional handiwork, modern aesthetics, and politics. (2009, 65 min, digital video) Where: Something from Nothing: Films on Design & Architecture – 701 Mission St., San Francisco, CA 94103 – YBCA Screening Room Public Info: 415-978-2787 or ybca.org $8 regular; $6 students, seniors, teachers & YBCA members Enjoy same-day gallery admission for all YBCA presented films!

Topic by YBCA 8 years ago