balancing windmill blades

A 5 blade rotor. making our own replacement blades a fair bit o' resestance to rotation from the generator, therefore, balancing it on the generator shaft is probably a no=go. the owner, for whom i'm doing the work suggests balancing 2 blades against one another.   But there are 5!  not 2 or 4.   maybe we make it a 4 blade... maybe we make sure each blade is excactly the same weight AND with CG at the same distance from center (sounds cumbersoe to get both mass And cg identical. suggestions?

Posted by Toga_Dan 4 years ago

How to balance a mobile... and attach its parts?

I've always been interested in making mobiles, or at least making the various parts that I would like to balance in a mobile. I've only really made one, which was a real hack job. I want them to look nice, so...two questions: 1) Is there a scientific method for achieving balance in a mobile apart from guessing? In the one that I did make, I used a fairly thick flower-wrapping wire, tied the parts to each end, and then found the fulcrum by balancing it on my finger. This is an awfully rough approach and is only so accurate. It worked okay, but I'd like to know how you've found success in doing this. 2) As far as attaching the parts to the end of the wire, how do you do it? I'm not very happy with the flower-wrapping wire because it's so tender and warps so easily. It's impractical for shipping or moving the mobile. Not at all durable. So what material do you use for the wire portion, and HOW do you attach your parts to it? I've tried twisting loops into the wire, but it really messes up the general straightness of the wire. I've tried tying fishing line onto the wire and adding a dollop of glue. But that's just ugly. If you have a good online source for making simple mobiles, and the materials one should use, I'd love that too!

Posted by svirden 9 years ago

Need to know the part I am looking for

I am planning another project. It will be a somewhat Portable Steam Punk Balance ( Scale ) . The idea is only one arm is to be exposed the other will be shorter and I want to attach it to ( PART? - I was going to say actuator but probably not the right part ) I want something that measures the distance it moves so it can be scaled to what the weight is. I want to hook this up to an Arduino to to the scaling and then output it to a display. The part will be hidden so looks are not important , I just want to know what is the name of that part and any sources would be greatly appreciated. TIA for those that help. Gunther45

Posted by Gunther45 6 years ago

Arduino-powered ball balance machine

This wood panel has the ability to move a ball anywhere it wants thanks to Arduino, servos, and processing. If the noise could be cut down this would make for a very cool installation. Origamata via Make

Posted by fungus amungus 8 years ago

how to build a balance board with proximity sensor and arduino

Hey guys,  So I am trying to figure out how to build a virtual balance board( using processing and Arduino), that responds to human weight when leaning left or right. An object would be falling in the screen on one side of the balance board and the person has to lean to the other side to keep the balance.  I would like to use a proximity sensor to receive and send the data ( weight ) to Arduino. I may want to use spring board for enhancing the force. So i need your help with the Arduino part, connections and coding, I appreciate your help and guidelines. 

Posted by shanymz 5 years ago

How do you make an escapement with a balance spring?

I have a problem My cat has a weak stomache so he needs to have a lot of small meals during the day, but there's not always somebody at home, so I wanted to make a cat feeder device for this. I want to make a disc that rotates slowly, during the day, leaving open another segment of a cilinder after every period of time. In every segment of the cilinder is cat food(which is poured into it that morning) Under the cilinder I want a clock mechanism, with a balance spring. I want to make it with a balance spring because it shouldn't be too high, my cat needs to be able to reach it's food normally. I've made a mechanism with a pendulum before, but it was one meter in height, while now i want the mechanism about one inch in height. I thought only a balance spring would fit right in the cilinder under the feeder, but I never worked with one, I don't have one either. How does a clock escapement with a balance spring work? And how can I get a balance spring? Can I just roll a long metal strip intro a spring? My cat feeder doesn't need a complicated gear train, because whether it makes one revolution in 10 hours, or in 14 hours, that doesn't matter. thanks

Posted by merijnvw 9 years ago

Balance Bike type of RideOn but for grown ups? NoPedals

You know all the kind of training bikes LikeABike and Strider RideOn so many different brands and varieties and naturally them are for the kids so young them have not learned to pedal and keep balance so these first "bikes" are for them to run along like on a "Hobby Horse" kind of thing that have the added safety of both feet on the ground when them need to gain balance again. Them sit and walk or run and seem to really enjoy it. Now suppose you are some 65 years older than these kids. You have the balance and can go by pedaled bike but them are not allowed to take on the Commuter Train or on the Bus that goes to the big Mall you want to visit and when you arrive no bike is allowed in so it get vandalized or stolen outside. But if you had a Walker or Rollator kind of mobility aid then that would be allowed. So what if one took a "Toddler" bike and made a grown up RideOne or BalanceBike for grown ups. No pedals on it. That would not get allowed either unless it has an electric motor and look like an expensive Mobility Scooter. So one need a Rollator that transforms into a RideOn. type of seated thing that can be used to move around on. I wish one could easily combine these two things but I fail to have enough innovation fantasy on how to accomplish this. So I test if kind people here get a clue or hang on how one could do such a thing. Transformer Bike/Rollator or what to name it. I have bought several Rollators and several KickBoard GoPed similar versions one are supposed to stand on or walk behind All of these are hurting the knee. So one need a seated thing. Sure it does exists already. The KneeScooter but that one have a seat that is too narrow so it hurts the butt. The customers complained so now one can buy an extra seat or saddle to it that is broader and less painful. But the KneeScooter does not look like a Rollator at all. It looks like a Scooter. A Rollator need Castering wheels in the front that seems a must. It can be a three wheel as long as the caster is the front wheel. Now if you sit on a four or three wheel thing and push of or kick off with feet on the ground then there is now way to steer the thing. so a transformer bike/rolator need to change from free wheeling caster to a steered caster to be safe. So that is the criteria and difference. In one position it looks like a real standard Rollator that you walk behind or in front off. Then after pushing the magig button it turns into the steerable seated balance bike kind of mobility RideOn for grown ups with knee problems. I have written about this in another post too so hope I am not breaching a hard hitting rule. Here I ask more what to name such a thing and how to make that thing so popular that the accumulated popularity makes the commercial companies aware of the need. If we can come up with a catchy name for such a thing then somebody maybe make one and test the market? On the other thread I ask for somebody to help me figure out how to DIY make one or to modify a standard Rollator so it can fill both functions. You would make me very happy if you come up with a catchy name for such a thing.

Posted by kneeproblemguy 7 years ago

An Exploratory Research Mechanism

Designed and Built by Emile Cole Range of Motion Video (profile).... Range of Motion Video (front)....;=E7CEwnOFnCk   Hello all.... I've been working on this (hobby status) on and off over the last fifteen years or so.... a mechanism that immediately begins to rotate in either direction with an imbalancing displacement of as little as one degree. With repeated periodic displacements of as little as five to seven degrees its rate of rotation rapidly approaches about a 100 to a 150 rotations per minute over the course of just eight to ten repetitions, all while overcoming only negligible frictional resistance from the main axel (equipped with bearings). It may have some applications for extracting rotational motion more efficiently from wind and wave and maybe a couple of other things too.... or it may just be a work of art.

Posted by EmileCole 5 years ago

Self-Balancing Smart Scooter

I hope you enjoy the job, Greetings

Posted by Andromeda30 2 years ago

How To Turn ATH-MSR7s Into Balanced Headphones

So, I've Had a Pair of ATH-MSR7 Headphones for a few months now and I've wanted to know how to turn them from standard wiring to balanced wiring with 3.5mm jack endings (Got the Idea after reading how to do this with the ATH-M50X Model, If Anyone can give me an answer or point me to a tutorial (Trust me, I've searched, can't find a tutorial) i'd be mighty grateful. Many thanks for a reply. Also this is for a portable DAC with two headphone Jacks like a Pono or an AK240. Thanks again.

Posted by Desmin Grey 1 year ago

Hi, new member here... Make your own balance board

Hi,I'm a new member here. I've got a video on metacafe that shows how to build a balance board.Here's the link: leave a comment if you like it,Sam

Posted by sam noyoun 11 years ago

Balance Sessions Part II

A while ago, I posted a video and an instructable about balancing boards. In the video I promissed viewers that there would be a sequel with the construction of my homemade board. Here it is.Hope you like it! I spent about two days making the board. And about 4 hours chopped up of editing.How do you like my editing?-Evan

Posted by evy-wevy 11 years ago

I rly wanted a balance board...

I saw this article, made this: me what you think please!

Posted by evy-wevy 11 years ago

Wine Stand that is a Balancing Act

Does anyone know how to construct this balancing piece of wood that holds a bottle of wine. I hate to spend over $20 for a 50 cent piece of wood that I could make at home.I appreciate your help, and I just know there are a few of folks that are mechanically inclined that can solve this...Thank you!;_medium=email&utm;_content=bottle_balances&utm;_campaign=topBalancing ActCoolest way to store a bottle of wineIs this magic? No, it's a little science. The weight of the bottle shifts the center of gravity that makes the wine appear to be suspended in mid-air.You'll get loads of comments, smiles and laughs! These positive reactions make these wine bottle balances a perfect gift! After all, Ben Franklin said, "Wine is constant proof that God loves us and wants us to be happy."Made of solid wood.

Posted by KeyWest 10 years ago


Hey everyone, I need some help for my project paper. I want to build a self-balancing "one wheel". But I dont know where I can buy a wheel hub motor. I searched on Alibaba and found some fitting ones. A 800W 48V DC Brushless (Wheel Hub-) Motor. But i don´t know which speed motor control is the best for this type of motor. I want to use an arduino uno ! Can someone please Help me finding a motor control ? Thanks a lot :) PS: Sorry for my bad english :) I am german

Posted by Lucafaeth 2 years ago

iMAX B6 Digital Battery Balance Charger

Hey i just found this cheap charger on eBay and i was wondering if it would be able to charge a pack of 18650(unprotected) 3P4S safely? i figure i could just run the charger to each 3P set and be confident it want gas/explode?

Posted by andrewlapham2010 1 year ago

Dual energy generation with magnetic Seesaw system and gravity with the help of 3 volt toy motor

This technology is based on  a Seesaw system and magnetic repelling principle Linear motion  .We can generate electricity with very little force with the help of this technology.This will be a radical step in the field of energy generation. In this technology there will be a balance system and two heavy weight magnets(high strength NEODYMIUM MAGNETS) will be attached with each side of this balance system as per diagram. As per diagram there will be two moving weights and these moving weights will move on tracks.These tracks will be fixed at the angle of 8 to 10 degree. Two magnets will be attached on the front side of these moving weights and these magnets will have similar polarity with the magnets of balance system. These moving weights will be attached with two gear boxes and these gear boxes will be attached with two generators. HOW THIS TECH WILL WORK? When one side heavy weight magnet of balance system will be pressed with the help of any kind of external force then this side will come down and repel its side moving weight due to equal polarity of magnets.due to repelling the moving weight will move forward .but when the heavy weight magnet will move upward then this moving weight will move backward due to gravity to get its position back. in this way this moving weight will work to run a gear box and this gear box will work to start a generator to generate energy. This balance system will also work to pass through their side copper coil due to linear movement and in this way this technology will generate Dual energy. WE will take very high strength NEODYMIUM magnets  for balance system. I would like to insist on some following points (1) The balance system will be attached with 'L' form crank with external PRESSING source. (2) The moving weights will also be attached with 'L' form crank with gear boxes. (3) Each side magnet of balance system will work one by one .When one side magnet will come down the another side magnet will move up .These magnets will come down and move up one by one to repel their side moving weight. (4) We can take as much weight as we can of these magnets of balance system .(500 kilogram to 1000 Kilogram or more) to pass through the heavy coils having 100000 turns or more.  (5) External source of pressing this balance system could be anything such as pressing with foot  or solar cell. WE WILL NEED ONLY 3 VOLT EXTERNAL ENERGY TO PRESS THIS BALANCE SYSTEM  AND GENERATE MORE AND MORE ENERGY.

Posted by vikram_gupta11 1 year ago

Ideas for a counter balance

I am looking at ways to replace the weight of the batteries in a cordless drill (the batteries leaked, and they are not sold to my knowledge anywhere in THIS country); after wiring in a power supply (making it corded).   Any suggestions?   I have thought of a few but nothing seems overly viable at the moment.

Posted by Goodhart 6 years ago

I Challenge You: Cable Driver

The new challenge!A cable driver!It's relatively simple idea, but balancing it will be hard!Tip:Use an engine or else it would just roll of the cable.Use weights for balancing.Best of luck, dudes!Link to the group.

Posted by Skreetsha 9 years ago

(newsletter) Wooly Willy Table, Self-Balancing Skateboard, Platypus Inaction Figure

  Wooly Willy Table Dead Computer Contest Winners Platypus Inaction Figure Sew Warm Contest Winners Coffee Can Alarm Clock Self-Balancing Skateboard Grout Portrait Busts Paracord Playing Card Safe Explosion Box Rear Pocket Camera Mount View Radioactive Particle Vapor Color Changing Deck Lights Ultimate Phillips Guide Cup Prank - 82 2nd St. - San Francisco, CA

Posted by fungus amungus 8 years ago

Reef Globes, worlds smallest balanced reef aquarium

These are aged systems that keep myriad coral reef organisms alive using a delicate balance of natural materials and very reduced manmade gear. They are like ecospheres, but to the 20th power. Compared to an advanced reef aquarium they are just as stable due to design features, and they bring marine science study into the home in a practical manner. There are no others in the world like these designs and they are easy to build but expensive to build as well. I hope you enjoy my invention now posted as an instructible

Posted by brandon429 8 years ago

An Instructable in New Scientist!

Instructables member XenonJohn has had his Self-Balancing Skateboard featured on New Scientist TV, using video taken at the UK Maker Faire. I had the pleasure of meeting John at the Faire, and I can safely say that this world needs more like him. Kudos, John.

Posted by Kiteman 7 years ago

Robot that walks like a human

Watch a video of a robot that walks like humans and balances itself to avoid falling.

Posted by blkhawk 5 years ago

Self-balancing motor sizing and drivers?

I'm starting to plan a self-balancing unicycle and I notice several people that have built them are using 450-500W motors. I'd like to use something a bit more robust, like 750W @ 24v, due to terrain. I'm wondering if that's too much and if the guys that are using 500W are happy with the results? Has anybody tracked their current (amps) usage? My guess is that unless you're going full speed and uphill you'll rarely hit full wattage on your motor except for temporary instances. One of the challenges I'm finding is that there are motor drivers up to 25A at 24v or 36v that can handle a bit of surge, but then it takes a huge leap to 160A and 400A surge. I don't think I need something that large and expensive, but my electric motor experience is limited. Could some of you more experienced guys chime in with a bit of advice? Thanks, Gyv

Posted by Gyvven 5 years ago

wiimote or a ps3 controler controling a self balancing skateboard...

I am looking at making a self balancing skateboard... i am having trouable finding step by step instructions for the ones that use the sensors... so i was thinking that if i could use a wiimote or a ps3 controler becuase everyone knows that the wiimote has gyroscopic sensors in it and the ps3 controller has a sixaxis thingie in it...(i know that thingie isnt the correct term for it...) so that gave me a good idea instead of piecing together gyrocopic sensors and many other things than why not just use a controller to control it... and if anyone knows another way to control a self-balancing skateboard... or a way to hook them up to the board... and i am not very good at programing so... if you could just send me a message of the programing to use the controlers as a controller than that would be great... if anyone thinks that this way is just to much harder than it seems than please tell me... thank you, Girrrrrrr2

Posted by girrrrrrr2 11 years ago

Why Knex bullpups are (mostly) useless and a stupid idea.

So in the real world the point of a bullpup design is to either reduce the overall length of a gun, or to have the same length of gun but with a longer barrel, which results in a higher velocity bullet which can go further.  Another often added bonus is that the gun is more balanced weight wise around the handle, making it easier to handle.   Now to crush your dreams. Not a single on of those advantages carries over to knex guns.  Not one.  A bullpup knex gun will only end up longer(yes LONGER), use more parts, have theoretically lower range, it is less balanced, and more complicated with more things that can go wrong.   With a knex gun, you want as short of a barrel as possible for the shot to go through, so that there is as little friction as possible on it.  This is one reason that turret guns can be so powerful.  Now with a bullpup design, you almost automatically have to add a longer barrel, as the shot has to leave the action area AND go over your handle/trigger mech.  Not good. The gun will be less balanced because now basically the entire gun is behind the handle, unless you put some fat barrel on the front to balance it out, but then that breaks the first point I talked about, as well as using many more parts and defeating the purpose of being a shorter weapon.  Most ram guns now are mostly balanced, as the handle is usually in the middle of the gun, as the ramrod has to be pulled behind it as well as going in front of it, so you place the handle and trigger as close to the middle so as to make the trigger simpler. Now as to why making a knex bullpup will make it longer, just look at the pictures.  It will make sense then.  Also this is why you need many more parts for a gun like this.  Also the stock becomes disgustingly long. And finally, this is more of a design issue than a complete flaw, but the trigger is usually(USUALLY) weaker and more prone to failure/not working correctly with a bullpup gun.   Now this doesn't apply to everthing.  Slingshot guns and repeating slingshot guns actually benefit from a bullpup design, that will actually make them shorter and more balanced, because they are more similar to real guns in their layout in that the shot/magazine is the farthest part back in the mechanism.  Also replicas, well duh.   The pictures should make this all make more sense.  And I assumed a build for performance, so the pin draw is long and the magazine is as far away from the pin as possible.  Because all knex guns should be built like that.

Posted by TheRacker 5 years ago

Energy wheel

This Idea is based on Magnetic Repulsion and Kinetic force. According to diagram there will be a  Wheel and a magnet(1) will be attached with this wheel. There will be a balance system(seesaw system) and two magnets(2no.magnet and 3no. magnet) will be attached with this balance system . when 1 magnet will repel 2 no.magnet then the 2 no.magnet will move upward and due to this movement the 3 no. magnet will come down and will work to repel 1 no. magnet and wheel will start to rotate. when 1 no. magnet will again repel 2 no.magnet after a rotation then the 3 no. magnet will again work to repel the 1 no.magnet. In this way the wheel will rotate again and again.The magnetic strength of 1 no. magnet will be high than 2 no. and magnetic strength of 3 no. magnet will be high than 1 no. magnet. I want to develop this technology.

Posted by vikram_gupta11 2 years ago

Ikea hack with magnets

Hey guys!I just bought myself a Ikea PS laptop workstation. I thought it was heavy enough to stand on its own, turns out it isn't. I don't want to drill holes on the wall, I thought about using magnets to give balance to it.Questions are:- can I do that? I mean, magnets to hold a metal structure plus using that to hold electronics such as laptop, DS, camera, mobile etc.- in case I can, which sort of magnets should I buy? The open lid on the Ikea PS supports up to 25kg/55lb, plus 15kg/32lb from the PS itself. There will be support underneath to hold the weight (thought about using glass jars, grouping three on each side, totaling six), so the magnets will mostly add balance to the structure, and not hold its entire weight.Thanks a bunch for taking the time to read this! A good day to all.Cheers,Diogo Slov

Posted by slov 9 years ago

converting a bike to a trike?

Anyone have info on converting a bike to a trike? My disabled son has balance issues but wants to ride with the family, however we can't afford a new adult tricycle or one of the expensive conversion kits. He's much too large for training wheels to work. I'm hoping to find a way to convert an old bike with minimal expense and no welding.

Posted by valr 10 years ago

Start Rating!!!

A lot of people are complaining about the new Rating Sytem. Well, here's the thing, if you don't rate, these ratings won't become balanced, and they'll stay that way forever!Rating isn't hard, just choose how many stars an Ible or topic deserves!Even if its just a forum topic, rate it!It won't take your time! We need to get these ratings moving!If you're not part of the solution, you're part of the problem.

Posted by Keith-Kid 10 years ago

Xaxxon Oculus Prime

I have bought and built a OculusPrime, While the unit is sound i have had problems with LIPO batteries charging wrong even though it has a balance feature , I have also had calibration and program (python) issues where it will work for a day or two then out of nowhere it stops working Does anyone know or have one of these units that could send some much needed help?

Posted by cybersarg 1 year ago

flat plate evacuated solar panel

Hello, I am trying to figure how to make an evacuated flat plate solar thermal panel ( sort of this one: ). Main problem so far is how to keep air out (vacuum) . What sort of o-ring should I use ? Would it be possible to use Arduino to control internal vacuum and act a vacuum pump to keep it balanced in time ?

Posted by gabdab 8 years ago

Cell phone batteries/battery pack

Hi all,i want to build a battery pack from mobile phone batteries my plans is to connect them in parallel 4 of them and charging it from a single TP4056 module the batteries have a built in protection circuit  each battery is 3.7v 1500mah. what do you thing is a good idea to put them in parallel or they need something special to keep them balance any help is highly appreciated thanks in advance

Posted by 8anashsb 2 years ago

micro alternator airborne / out runner balance charger for large scale rc aircraft

Using the same concept as diesel trains. As they drive / pull on electric. The drive train is actually electric . The noise we hear are the generators charging the power banks. . Electric are far more efficient than diesel or gas engine direct  to the drive train. That being said. How can we set up micro scale generator on board 1/3 scale electric rc airplane. concept : connect 40 size os max rc nitro engine direct to 700 kv E. out runner shaft , rectifier bridge /  12 volt SMART lipoly charger, all this to enhance primary lipoy bank on large scale electric rc planes. ( increase flight time dramatically) sounds stupid I guess, but the concept apparently works in real world cargo trains. Can anyone help wth the system set up of rectifier bridge components to give this a shot ? I have no electrical expertise.  Thanks Jeff

Posted by JeffR135 11 months ago

Walker/Rollator/KneeScooter type of DIY varieties for knee problem

Hi I am totally new here but have used the search so need your help. I have knee problems. But needs something other than a standard Walker/Rollator So I looked on youtube and google for kneescooters or rideons and Balance Bikes. The reason is that I need something to sit on. A KneeScooter is ideal for that kind of thing. Them are like a knew walker or knee rollator but one sit on them instead. So why don't I just buy the best of them and just love it :) Well them are on the wrong continent. I live in and are a native of Sweden which is Northern Europe in case you wonder. We don't know about such high tech over here. Sure we have same "assisted" Scooters like you have. Like sitting on a three or four wheel Motor Scooter but electric instead of Gasoline. Heavy things you can not take inside unless you buy the coolapsable that is rather neatly made. Anyway I don't really need motor assist I do have muscles so I can pedal a bike but bikes are not allowed inside the Mall and get stolen outside the Mall. Bikes are frown upon on the communal transport like Bus or Commuter Train and such. A Rollator or a Wheeled Walker is allowed everywhere so what I need is a KneeScooter that looks and behaves like a standard Wheeled Walker/Rollator but that one can sit on and ride like a Balance bike for kids. I can try to link to or upload drawings later how I have tried to envision what such would look like or function. So to conclude. It should appear to the Guards, Security Persons at the Mall like any standard Rollator. But then outside when them look away you touch a few buttons or something and it transforms into this handy BalanceBike but for grownups that allow me to push and kick myself striding or riding along but without pedals or motors. Dimensions maybe at most a yard = some 3 feet length and width maybe at most 2 feet and height adjustable for individual length of legs. So it should change between two positions or functions. Like a Rollator Wheeled Walker and then change to a Balance Bike or toddlers bike without pedals so it should be caster wheel as a Rollator but steerable front wheel as a Balance Bike.

Posted by kneeproblemguy 7 years ago

DIY battery setup help

Hi, I'm a first time DIY-er and would like to build a useful, long lasting battery pack for my *new* laptop (late summer). I'm 17, and this would be a perfect project for me to finish in the next few months. I'll be working with my dad and asking my physics teacher, who seems very all-knowing, for advice. My teacher understands electricity and batteries better than anyone else locally and is leading our STEM team, of which I am a member and need this experience. Keep in mind that I'm not just doing this to have a (much needed) battery pack for my laptop. I got most of my information from here and will most likely be purchasing new batteries. As far as the housing of the components, I have a hard plastic, 10+ year old lightly used blue lego container in the shape of a kid-sized briefcase.  Case: Old blue lego carrying case, 11” x 7.5”(9 including curved  front) x 3.5” Insulation tape Batteries: (x4) Battery holders: (x4) PCB: (protected voltage is higher, balance charger required) Balance Charger: Fuel Gauge: DC port: Wire terminals (for organization) Balance charge cords: Optional inverter: I heard about these being inefficient, so I'm not sure about it. Please inform me if there are any other parts that I'll need or if I've left out any information. Also Inform me if everything I'll need for a lithium battery pack is on this list. P.S. The case was chosen based on the fact that it will fit in my backpack with my books and looks much less alarming and more like a DIY battery than a black box or briefcase. especially with the fuel gauge and plugged in laptop.

Posted by leaf26 5 years ago

Looking for advice on LiFePO4 car battery replacement for SLA

I'm thinking of replacing my 12V lead acid car battery with a DIY lightweight battery based on LiFePO4 cells, but before I dive in I'd like to get some advice...My plan is to use 4 sets of 2 x ANR26650M1B cells in parallel, to give 13.2V output, and high output current, and about 20Ah capacity.(These cells seem to be used in commercial lightweight car batteries, so seem like a good choice.)Now, question 1: Can I just use these 8 cells as a drop-in replacement? With, presumably, occasional balancing out of the car.I think the answer is no: while my initial research suggests that some people are using off-the-shelf LiFePO4 cells in this way, a whole lot more people write about the protection and balance electronics they're using, and I don't suppose they're all wasting their time.Question 2: If Q1 = "No", would adding a balancing and protection module enable the cells to work safely in the car? There are 100A and 200A 4s modules available, so they should be OK with starting current (c. 120A in my case). I guess it's a question of whether it's OK to have such a protected battery pack constantly hooked up to c. +14.4V from the alternator, or whether I need to limit the time that the battery is charged from the alternator.Question 3: is it smarter to use super capacitors plus lifepo4 cells, to enable higher starting current while keeping battery discharging current low? (I started out thinking of combining an RC LiFePO4 battery pack with 6x400F super capacitors, but realised that I could get enough current with the ANR26650M1B cells, and fewer components should mean less to go wrong)

Posted by PaulI48 4 months ago

I don't like advertising - PhotoShop/Paint-job

The message (to housewives) is "Which girl is your little girl?" Followed by the answer, which is the brand. There's a lot to see in there that divides the two characters into a back and white opposition. It's skewed two people to present the one who's mother does use (that) detergent as better. For the sake of balance, I decided to have fun by introducing some colour - white is a bit boring no matter how bright it is. L

Posted by lemonie 6 years ago

Linkit One abuse

I subscribed to the micro-controllers feed and I was pretty happy with the instructables being shown, however a few weeks ago something happened and now about 99% of the instructables that I get only use Linkit One as microcontroller, no more arduino, raspberry, etc. Later I learned that Linkit One is a "featured" product. I'm ok with sponsors and such kind of strategies to generate revenue, but do it in a way that allows you to have some balance.  If they keep doing this I'll be moving to another place.

Posted by ebeeche 2 years ago

LED Juggling ball

Hello, I want to make some glowing juggling balls (using LED probably), but I have no idea about what ball to use, how to make it turn on and off and how to balance it. I tryed the led ping pong balls (link at the end), but they're too small and light. Any ideas? How do the glowing balls work (those that from Yo-ho, for example)? Thanks. LED Ping Pong Ball

Posted by Kokkan 8 years ago

Worlds Smallest Saltwater Reef Aquarium

These are aged systems that keep myriad coral reef organisms alive using a delicate balance of natural materials and very reduced manmade gear. They are like ecospheres, but to the 20th power. Compared to an advanced reef aquarium they are just as stable due to design features, and they bring marine science study into the home in a practical manner. There are no others in the world like these designs and they are easy to build but expensive to build as well. I hope you enjoy my invention now posted as an instructible

Posted by brandon429 8 years ago

Balancing Relationships

Right so my bestfriend is jealous of what my boyfriend and I have, or what I have with him... She told me yesterday that I am a completely different person when I'm around him and that it makes him not right for me... With her I try to have actual conversations but it just turns in to he's saying how cute Kyle Busch looks, or Carl Edwards without a shirt, or her talking about finding her teachers attractive, I always know what Mr, D is wearing, McGee from NCIS (I personally find DiNozzo more attractive). With him though I don't have to worry about hearing how good Mr.Alex looked in his new black shirt and out of style glasses... He and I have talked politics, hunting, and movies that she refuses to watch because she thinks they'll be boring, like, "Shooter" with Mark Whalberg... Is it that my personality is different or just that with my boyfriend I am able to explore my mind more and talk about things other than attractive men and Kevin Harvick in tight pants... I'm obviously not good at having a best friend and a boyfriend, I need some serious help on this subject...

Posted by Happy2917 9 years ago

micro camera for Rc planes

If been wanting to film some of my Rc flights iv been thinking of two ways to do this: A.) buy a mini camera (not wireless could cause interference with other planes or mine although it should only affect 2.4GHZ or spreed spectrum channels which are designed to handle this kind of interference but i dont want to cause any accidents) or B.) Buy a cheep digital camera and mount it to plane Things to consider:Any thing will add weight to the plane which will affect balance (to solve this add weight till balance)I want to avoid wireless. How to power; battery's weight a lot and take up lots of spaceDragSize of cameraIf i do use micro camera where will it record too?Dose any one have any suggestions or ideas on the best way to do this on the cheep?*update* i found a Camera called the flip video camera it has every thing iv been looking for its cheep about 150$, has a tripod mount, records 60 min of video, comes with editing software, runs on 2 AA batteries, and has a small (1.5inch) Lcd screen

Posted by i make shooting things 10 years ago

micro camera for Rc planes

If been wanting to film some of my Rc flights iv been thinking of two ways to do this: A.) buy a mini camera (not wireless could cause interference with other planes or mine although it should only affect 2.4GHZ or spreed spectrum channels which are designed to handle this kind of interference but i dont want to cause any accidents) or B.) Buy a cheep digital camera and mount it to plane Things to consider:Any thing will add weight to the plane which will affect balance (to solve this add weight till balance)I want to avoid wireless. How to power; battery's weight a lot and take up lots of spaceDragSize of cameraIf i do use micro camera where will it record too?Dose any one have any suggestions or ideas on the best way to do this on the cheep?Original form (it was origanaly posted in that group but it got separated) *update* i found a Camera called the flip video camera it has every thing iv been looking for its cheep about 150$, has a tripod mount, records 60 min of video, comes with editing software, runs on 2 AA batteries, and has a small (1.5inch) Lcd screen

Posted by i make shooting things 10 years ago

Camera Stabilizer (Physics related)

I had an idea for a camera stabilizer a while ago which involves some basic rules of physics. I've done some thinking on it and I can't seem to figure out if it would really work or not. It involves two principles: 1.) Torque (t=f*d) 2.) Inertia (p=m*v) ---- The idea is to combine a gimbal design found on camera "gliders" like these: -Commercial product: -Homemade design: ...with some sort of see-saw to counter the effects of up-and-down motion.  Ignoring the fact that this might be somewhat hard to hold such a thing, I just want to know if this would work. ---- Any balanced see-saw will have an equal amount of torque on either side of the pivot point. Therefore, a balanced see-saw will work with 500g hung 10cm from either side of the pivot point, OR 750g 5cm from one side and 250g 15cm from the other side (750*5=3750; 250*15=3750).  With this concept, I thought of designing this part of the stabilizer like a small camera jib ( That is, the camera on one end with a counterweight on the other. The pivot point would have a handle or some kind of vehicle mount on it.  The stabilization occurs (or so I'm thinking) because of inertia. Inertia=mass*velocity. So, when the pivot point (the handle) moves up or down, one of the sides of the see saw should move up faster than the other. The side that moves up slower (the longer side of the see saw, I'm thinking) should have the camera mounted to it.  ---- Is there a flaw somewhere in my thinking? THE QUESTION: Would both sides of an uneven length, balanced see-saw move up at the same time when the pivot point is moved up or down? I'm not really sure and I'd like to hear your input. 

Posted by John Smith 6 years ago

Brushless Motors

I have a few fans around from computers. Seems that 3 wires is pretty common for these. I wasn't sure which was what, so, I figured "nothin to lose" and hooked up the right voltage across 2 wires. My guess was right. It ran. But, having 1 out of 9 fanblades busted off, it shook a bit. So, I busted off 2 more blades to balance it. But now, even connecting it the same way, it doesn't run. So, how should a 3 wire brushless motor fan be wired?

Posted by Toga_Dan 3 years ago

Chip Bag Survival

Hello Everyone: This is my first post in this forum. I have a website on preparedness and survival. I have posted also my first instructable as well basted on this topic. So my challenge to everyone is to use only chip bags and duct tape to come up with something that could save your life. Other than the fact that potatoe chips are part of a well balanced diet. The bags can be used to make all sorts of things. Have fun. Like this one below. Robert (Survival Central editor)

Posted by SurvivalCentral 7 years ago

school project help

Ok i am in honors science in 9 grade and my teacher decicded to make u do a project. she told us to go out and watch the sunset (go down) and record the time and do a little scetch. but she didnt figure in tht someppl have lives and i have football practice. so is there any pattern tht the sun moves in so like i can watch it one day and approximate for the rest. i am really trying to balance everything and do my best but jut cant do it all. any help would be greatly appriciated

Posted by fretmelter 10 years ago

Arduino Input

I am writing an Arduino program to read speaker inputs for a test station.  I need only to know when a speaker lead is on or off. This will be done by using the fade and balance.  Originally I was connecting the speaker leads to the analog inputs and could get a single line to work as a simple VU meter. Multiple lines gave issue.  Since I don't need to know the actual level, just whether they are on or off I'd like the speaker lead to trigger a transistor connected to a digital I/O pin on the Arduino.  Any thoughts or quick schematics on how to do this? 

Posted by dbirky 4 years ago

Help! Please Donate More Common Sense!

It's not that I don't have common sense, It's because I think like this. I overthink things, when the answer is usually simple. Maybe I take things way too seriously. It probably took Brooklytonia about 20 seconds to read and figure this out... About a week ago, I uploaded an Instructable that I thought would be a HUGE hit. It wasn't. When my Instructable on Dimmable LED Workshop Lighting (Very High Efficiency) got featured in the Newsletter, it got 100K+ views. This is because it was at the top, and it was impossible to miss. When my Instructable on Insanely Bright LED Panel got featured in the newsletter, It got 40K+ views. It was at the bottom left on the email. I figured that it made sense. When my Instructable on Articulating 70W Spectrum-Balanced LED Panel got featured in the newsletter, it got ~10K views. This makes no sense! (I've changed the titles to what the staff changed them when they got featured in the newsletter. Not sure why I remember this...) Dimmable LED Workshop Lighting (Very High Efficiency) - Good title. Good thumbnail. Main Instructable - TONS of clicks - 3K views in less than 10 minutes Insanely Bright LED Panel - Okay title (not my fault!). Fairly good thumbnail. Located at the bottom left - Quite a bit of views Articulating 70W Spectrum-Balanced LED Panel - Good title. Good thumbnail*. Located in the middle. - Not a lot of clicks - 3K views in several hours. WHY? Of course there are several things that differ between Insanely Bright LED Panel and Articulating 70W Spectrum-Balanced LED Panel. But why such a difference? I mean-- I always compare the statistics of my I'bles, and try to make them better. It's usually hard to compare, and surprising. But why is there such a huge difference between two Instructables that are pretty similar? *I changed it a couple hours before it got featured in the newsletter, with the Instructables Pixlr editor. I know it turned ot a bit weird, but it was the best that I was able to do. The Pixlr site has better fonts, but the biggest on was still soooo small. Maybe I did something wrong. Images of before and after: 

Posted by Yonatan24 1 year ago