Topics


Separate network for 5 Slaves 1 Master 1 server

I've build a home thermostats system with PIC18F27K42 in each thermostats with LCD, for 5 rooms, 1 master in kitchen and 1 server in the basement, working on a bit-bang i2c. The server only send data to i2c at every seconds as it have a RTC (Chronodot) plus freezer and external temp sensors. The kitchen has a bigger LCD and can send data to the server to send to a dedicated or all thermostats using an ID in the data stream. I have read some docs on the net and bought a ESP32 DevKit V4 with WROOM-32D (changing later for a WROOM-32U external antenna for the downstairs server) and 6 ESP8266 ESP-01S module to include in each thermostat. My goal is to use the wifi instead of the i2c. So I'd like to have some guiding on how to achieve this. Maybe later I may use this wifi to use internet to change some settings in one or all thermostats. But for now do I really need to use the house wifi or can I use a kind of "thermostats wifi", separate from the house one, mostly for heating security. If so, how can I do that, since I'm kind of new to network and wifi. Many thanks to all.

Topic by djdan_23    |  last reply


Develop - Protect your invention

Hi All,Has anyone found a good article re: developing and then protecting your invention?There are all these TV ads for companies to help you file a patent application which seem dubious.Have you found other forums besides here to ask questions as you go along and develop your invention?Are there any engineering forums where you can discuss with design engineers how to build a prototype or model or create blueprints for it?Thank you!

Topic by eager to learn    |  last reply


Post your best jokes here!!!

Whoever posts the best damn joke there is (judged by me) will win a free patch.(not a huge prize, but I hope you still try) Note: The jokes should be appropriate, with no bad language. (8+) The comp has been won! ilpug won with his hilarious panda joke! I hope you all enjoyed each others jokes!

Topic by HMice    |  last reply


Single PCB manufacturing sources

Hey all, So I found a project on here that will fit my needs for issue I have. It has scematicats and a board design. Are there services that make up these items? I really only need one or two made so not sure the big PCB guys will take it on. Any leads appreciated!! Thanks PPVSteve@Gmail.comProject: https://www.instructables.com/id/Simple-manual-control-of-stepper-motors-without-a-/

Topic by SteveW306    |  last reply


How to view the view of a SQ8 camera on your computer?

So I got this SQ8 camera just for fun. Right now I'm wondering if I can show the the camera's view on my laptop? The SQ8 say it can connect to TV and show it's view, can I do the same with my laptop? Here is what I conclude: The USB port of the SQ8 provides 8 wires. However, the cable is split into 2 wire, 1 to the USB head (which have 4 wires) and 1 to the plug for the TV (by the look of things, there is only 2). I have no idea how data is transferred, but here is my guess. The USB head will provide power for the camera to charge and the last 2 wire may have to do something with shutting the connection (If I press the on/off button on the camera, my laptop signal the device has disconnected/reconnected to my laptop).  The 2 wire that transfer the image to the TV is the yellow head, which I have 0 clue how it works cause I haven't learn about it. My question is: is it possible to take this 2 wire to connect and display my camera's view? Here are pictures that I took. In the pics there is the port that the camera has and the 2 end of the cable. 

Question by Shizen    |  last reply


How could I tell if someone installed a phone tap, camera, or voice recorder in my room?

When I leave for work, I sometimes leave my bedroom window open. There is a medium sized gap between the screen about the size of your fist. Is there a way I could tell if someone has tapped my house? Recently my Samsung Flat-Screen has been very snowy and I remember that you could tell is something has been tapped because they interfere with your tv. The house I just moved into also has a wire panel outside my window which you can reach. My room is first floor, please help. I cannot sleep. I also read that you can tell just if you can pick up RF signals coming from the device. Can someone give me a schematic for an RF Signal detector? I can't afford the commercial ones, I once read a stat that if you suddenly wake around 2am or 3am there is %80 chance of someone staring at you. Your body naturally senses this somehow. Well, when I looked at my window, I saw a light then after a few seconds it was gone. I went outside and I heard a couple of cans fall over and my fence my shaking like it was moved. My gate is usually locked but it is a reletively short fence. I haven't slept for days. I can't stand it. I'm going today to buy some black curtains as these cheap plastic blinds aren't cutting it

Question by halo99    |  last reply


i want 2 make a project by using ic 741.. coz it is given by our colg... plz help me...?

Project shud nt b complicated n expensive....

Question by sandyee501    |  last reply


My break action knex pistol

This is my new break action pistol! Should I post?

Topic by Knex_Gun_Builder    |  last reply


Anyone want to Co-Create the future?

Hi all sydney instructables and indestructables - i just love all this stuff and i am sure some of you are just as passionate. i am running a futures festival and currently in open innovation/open production mode - ie., we all get together and just make a really cool festival. Its called Live Futures 2020: A World of Opportunity. We are creating interaction spaces for the public, particularly young people, futurists, scientists, inventors, researchers, designers, artists, performers, architects, engineers,.......to co-create the future. covering things like nanotech, biotech, health, robotics, education, climate, retrofitting cities to be sustainable, etc... only limited by all our imaginations. If you have something cool to share or just like the idea of co-creating the future join us to create the festival and share the loveat last year's festival we had a young guy who made the coolest electronic musical instruments out of junk and old toys and the crowd loved it. I am sure we now have upcoming electronics whizzes in sydney because of him, i hope tim'll be with us this year too. maybe you have something inspirational too...

Topic by j9j    |  last reply


British law on defacing coins? Answered

I wanted to drill through a 10p to make a ring like the ones on this website. BUT I NEED TO KNOW THE BRITISH LAW Lots of people are saying its illegal and stuff.  

Question by The Science Guy    |  last reply


Increase the speed of an electric motor? Answered

My electric bike, seen here, was built for my senior project. I was limited on motor choice, and had to go with the best I had, an old powerchair motor. After 2 successfull attempts at building an electric bike, I have discovered that it is impossible to go faster that 25 mph with with one of these motors. As you can see on my instructable the bike has 6 speeds, with a top speed of 20mph in first gear. however, when I shift gears, the motor rpm's decrease instead of the speed increasing. I have heard before that it is possible to run an electric motor at higher voltages than it is rated, so I was wondering, if i could add a seperate switch and a "booster battery" of sorts, that as long as I monitered the voltage so as to not let exceed 24 volts, if this would be feasible. My only other option would be to add a second motor in parallel with the first, and on the same drive belt. The first option would be the easiest, if it could work without damaging the motor. Any help would be appreciated. Thanks, iloveairsoftstuff

Question by the mechanical engineer    |  last reply


how to clear up foggy fish tank water using house remedys?

I have a 5 gallon tank and would like to clear it up any suggestions?

Question by pianolover10124353    |  last reply


Micro sstc trouble Answered

I am trying to build the micro sstc by steve ward. My circuit  behaves like there is a short somewhere, but I checked  all the connections. The mosfet isn't connected yet and the 555 timer is getting hot, any ideeas?

Question by theVader75    |  last reply


Food Saver Model V3835 won't open for cleaning?

I was trying to seal a food bag and the vacuum wasn't working so I decided to clean the tray that collects moisture. However after pressing the 2 release buttons the food saver wouldn't open up for cleaning. I have been unable to find what is holding the unit closed. I removed the bottom cover and found the right hold down gear/"hold down" paw not engaged. I re-engaged the paw but still can't open the unit.

Question by glmartin    |  last reply


How do I separate gold from surrounding ores

I live near the site John Marshall discovered gold in 1848.  There is gold dust and particles everywhere!  Problem is that the gold is dust or fine powder form and the gold strongly adheres to it's surrounding ores.  Panning is tedious and not effective.  How can I separate the gold dust/powder from the other minerals?  I have heard using Auger Regis is effective, but cannot find anything on how to use it, purchase it, or make it myself.  Any suggestions/instructions on making or using auger regis; or any other more effective method of extracting the gold from the other minerals is greatly appreciated.

Topic by Ruthless0240    |  last reply


Tesla's earthquake machine - was it just a practical joke?

Nicola tesla, in his early years, was not shy when it came to use science through direct contact.Most of it we would call today playing practical jokes on students and friends alike.His harmonic balancer got the nick name earthquake machine.I won't go into the story how all came together, you can read the story on Wikipedia or other sites to the fullest of your imagination.Howver, I would like to go into some details of this invention.Or better: I will try to explain my view on why this machine might have actually worked close to what the story tells....Studying old paents and other documents is no fun and not always you can reach any valid conclusions from any of it.I mean, if you coud then you wouldn't need a patent for it.Some things however are so good, so special that they never get a patent, the company keeps it as an iternal secret.Same way a brewery won't tell you the exact recipe for the beer they make ;)The harmonic balancer has very little to go with except stories and some comments Tesla scattered here and there.So let's start by some claims Tesla made about this machine:1. It has a free swinging mass.2. The mass is balanced using "air springs".3. It usues very little energy.4. It finds the harmonic frequency of the object attached to automatically.If you think about the above you could say right away it is bogus.But think about the terms and language of the old days ;)Add the fact that Tesla never really gave any direct answers to how his inventions actually work and you see where I am going here.Point 1 and 3 are easy to imagine in many ways.Number 2 on the other hand contradicts itself at a first glance.But, if you place a piston with a good mass and good seal into a cylinder nd close both ends while the piston is in the center....A bit like these to shake emergency torches and flashlights.With that idea in the back of a head one can imagine shock absorbers and more.And a "mass" "swinging" in such a sealed tube would certainly be subject to the "spring" force of the air being compressed in front and the forming low pressure on the other end.The last one however had me stumped for almost two years with me getting nowhere.A mechanical system can't adjust itself to the harmonic frequency of anything....Then I saw a collection of funny videos.One of the clips had about 100 metronomes standing on a board.The board was place on two rollers so it cold move freely from side to side.All the metronomes wre set to about the same timing.But of course you just can't start them all at once or even so they swing in sync.After just a short while though, one by one found a matching partner on the board.Faster ones slowed down, ones totally out of sync seemed to miss a beat here and there.And then it hit me!Hundret swinging masses on a board and the board moves together with them!Once all were in sync and harmony the board moved basically exactly the same way sidewas as the single pendulums above.Number four finally solved :)How though could one try to replicate this impossible invention these days and without knowing any exact details anyway?We know it used one or two electromagnets.These moved the mass back and forth horizontally in the machine.However, it was more formed like a T wih a fat base.Tesla needed a dead simple way of doing with electricity what the metronome does just mechanically.If you have a little mass on a spring and one contact on the spring plus another on a tube that is around the mass - what do you get?No, not the trigger for something really nasty when you pick it up...Right! You get a motion detecting switch.A bit like our gyroscopic sensors do now in our phones....And if you cut the tube lenghtwise you end with two opposing contact to switch two magnets on depending on what side of the tube is hit by the mass (contact) swining on the spring.Try it out with a spring from old pen and a screw inside as a weight - quite sensitive if you get the weight right.Some drawing suggest he height was about the same as the width of the machine.This would suggest the contact was actually hanging upside down, so it could swing in the wider base.A bit of fine and very flexible opper braid with a weight would make a nice pendulum here....Do a little experiment first though ;)Make a sturdy frame or if you have none try a truck. ;)If you place the frame on wheels and a pendulum with just a string and some sinker at the end - what would happen if you move th frame sideways instead of swinging the weight?Inertia keeps the weight in place while the top mount of the string moves away.And if the weight stays in place for just a fraction of a second before starting to move with the frame?Correct! since the angle of the string changes, the ball appeas to move up.Not really by much but enough for an electrical contact to open....We have some ideas now on how those electromagnets might have been triggered by Tesla, what about the mechanics of the moving mass that claimed to have created earthquake like results?Precision is no problem these days, just check these toy kits to build your own Stirling engine or you trusty old Swiss Army Knife.And even a second hand air cyclinder and piston can be modded to act like a free swinging air pump.Only question that really remains would be how to match the mechanical system with the electircal?We have two seemingly independent masses, one to make things move violently, the other to energise the part that make the first mass move - or to be precise to give it a tiny push in the right direction.What does mean you wonder...Let me try to simplify it down a bit.....If you push someone on a swing you can have a very hard time by working against the mass of the person sitting and enjoying the ride.Or you could give the person just a tiny push - right when the swing starts from the highest point to go back.Could that mean it is really as simple to build as Tesla claimed?If the top mass is limited by how far it can swing FREELY before the air pressure works against this movement then we would only have to set the length of the pendulum so the contact happens right at that point on the x-axis of the top mass.Ok, and how would that make anything swing at all?If the top mass is first energised there is nothing to stop or influence the movement, except the "air springs".So it totally overshoots like those metronomes on the board.It swings back and closes the contact on the other side of the movement way early as well.Now the electromagnetic impulse from the second movement actually works against the moving top mass.And this swinging of total non-control continues while whatever the thing is mounted to also starts to move, even if it is just fractional.Over time both swings, from the machine and the object, will get to point where they influence each other in a "positive" way.For Tesla's experiment one would say negative though as it was quite violent in the end.Little by little both swing will get closer to being in sync and with that in resonance.The electromagnetic push however continues....Only that now the top mass of the machine is in sync with the thing it is mounted to.The machine became you standing behind a big swing and trying push someone higher and higher....It is all just a theory though and any minor earthquakes that might register around my area are pure coincidence ;)

Topic by Downunder35m    |  last reply


What to buy?

Hi Guys,I would like to make small wooden boxes, it's my first time would you advice which table with saw should I buy? Greets ChrisPs It should be small and not super expensive.

Topic by ChrisRydzewski    |  last reply


How do I Make a Quiet Book?

I wanted to make a quiet book for my toddlers.

Question by shrikrishnasawant    |  last reply


Rate my art

Hey, I recently drew a portrait of Lady Gaga, and I have then added some colour to it using photoshop. I would love if you guys could give me any critques or positives about it, so that I can improve it! And then I can start working on other drawings I have done too. Thanks :)

Topic by rebeccah18    |  last reply


Which is better K'nex or legos? Answered

I want to know this because i just want to know opinions so tell me yours thanks. If you want, please go to my page and subscribe please thanks for your time.

Question by LEGO SN1P3R[-_-]!    |  last reply


how to make a signal jammer???

Simply,easily,for project,what are the things to need,what are the problems in that,plz reply guys am college student...

Question by vairavel    |  last reply


Our puppy is losing a tooth. Do I pull it?

It's a side tooth and handing on by the skin. Do we pull it or let it fall out? I tried to pull it a bit but it's not giving.?

Question by sekrt8gnt    |  last reply


Please help me identify this Silver signet ring

Found it stashed away in my grandpa's house after he passed, he was a polish immigrant, so it might be from there

Topic by lauracz62    |  last reply


Mariko Kusumoto

I have been trying to create color stripes in the same manner as Mariko Kusumoto. Cotton and silk thread have not worked. I think I need a different tool to apply polyester dye or different thread. The second image is messy but it was to test the strength of the dye on the bubbles. I think my problem now is how to draw the lines using polyester dye before steaming. 

Topic by jeremyzschau    |  last reply


Want to build a automatic opening drawer? Answered

could i use a dvd tray as the actuator if it is under a light enough load? what is the max it could probably open? thanx for any help you can offer

Question by JustinJalapeno    |  last reply


AMEX card not working?

Ive been trying to buy a lab pass for a game Im addicted to. I click the one month option, enter in the info, but it says my credit or debit card is declined! Im using a $50 dollar American Express gift card, but whenever I enter the information it says its declined. So i check on the website, it says everytime I tried (and failed) to use it, it deducts $1. Same for my Visa Gift Card. My mom opened a paypal account for me, but whenever I try it, it says the amount is too great for the card. (its $5.95 ) Does anyone have anyway to fix this?

Topic by wolf555hound    |  last reply


The Clinic // Get help with your Instructables!

Hello and welcome to the newest version of The Clinic! If you have an instructable that's not getting the attention you think it deserves, post it in the comments below for honest feedback and suggestions to improve it from fellow authors and Instructables staff. We want to help you create the best instructables you can! Curious about the basics of creating an instructable? Check out my FREE How to Write an Instructable Class! You can also read through our Featuring Checklist. Posting a great instructable has many benefits, including:More viewsMore comments and followersHaving your instructable Featured on the site Having your instructable featured on our social media accounts (Facebook, Instagram, Twitter, Pinterest)Better chance to win contests Driving traffic to your websiteP.S. While I know the goal for any instructable is to get Featured, it's not the end goal here! We're sure to hand out features, but please keep in mind not every instructable is feature-worthy. Even the most popular authors have unfeatured instructables! Don't let it get you down - you're still amazing! :D

Topic by jessyratfink    |  last reply


Ping pong ball launcher

Hi everybody, i need some support in developing this circuit.I'm making a ping pong ball launcher and I just need a servomotor with a switch and 3 dc motor.One should move quite slow and I wanted to use a potentiometer. The other two move together or alone but at the same speed. I want to control the 2 motors and the servo with Arduino. I don't know how much volt I should apply. Should work this way?May anybody give me some hints? Thank you so much.If u may want to change something https://www.tinkercad.com/things/aPDSlGBukDM-epic...I left here my code: #include Servo servo_2;int counter;void setup() { pinMode(8, OUTPUT); pinMode(10, OUTPUT); servo_2.attach(2); }void loop() { digitalWrite(8, HIGH); digitalWrite(10, HIGH); for (counter = 0; counter < 10; ++counter) { servo_2.write(45); delay(3000); servo_2.write(0); delay(3000); } }

Question by vincenzoga    |  last reply


How powerful of a motor do you need to run an alternator? Answered

From questions I have read and step by step’s I have read a question came to my mind. How powerful of a motor do you need to run an alternator? I checked the Delco Remy alternator series from 10SI in 37 Amps, to the 40SI durable brushless model, in 240, 275, and 300 Amps. All their performance charts show rpm’s at the alternator not the motor. The pulley on the crankshaft is considerably larger than the pulley on the alternator, giving you more rpm’s at the alternator than at the motor. All their performance charts show rpm’s from 1200 to 8000 rpm’s. All their performance charts show at 3000 rpm’s you get 13/16ths of max power. The last 5000 rpm’s only gaining 3/16ths of power. The thing is none of the performance charts say the horsepower to drive the alternator. I decided to approach the problem from a different direction Typical alternator efficiencies are in the 54%-60% range. Brushless alternator efficiencies are in the 60% 70% range. A typical 12v 60 Amp alternator produces 720 watts at 55% efficiency. It needs just 1310 watts to drive it or a little under two horsepower at 1492 watts. This does not account for mechanical efficiency of connecting the alternator to the motor. With this in mind a three horsepower motor should drive a 12v 60 Amp alternator. This is just an educated guess but I would like a horsepower chart. 720 watts would do well at charging a battery bank while you sleep; however I could not run my microwave and charge batteries at the same time.

Question by Josehf Murchison    |  last reply


Be Nice Policy

Hi, I have created "Be Nice" memes for everyone to share here on Instructables. I thought it would be a fun way to share your thoughts using the Instructables Robot. You can download the images I created HERE. I will add more as I think of them or through suggestions from YOU. I have also added templates for you to create your own images. If you do create your own and wish to share them, please add them to this community post or to my original Instructable. Thank you and remember to Be Nice. Tater

Topic by Tater Zoid    |  last reply


Cleaning up STL files for 3D printing properly?

Every now and then I find a nice model on Thingiverse or such places that I would like to print.Quite often though these models come with errors.No clue why people upload them for 3D printing if the printing software can't print them....Anyway, there are quite a few online place that fix a model and make it watertight, remove flipped faces and more.Usually with quite good results unless the model is really crappy.What I miss though is a program or online service, preferably free of course, that can actually simplyfy a model to match a printers capabilities.For example a scanned object of just a few cm in size can come with over 100mb in file size with ease.There are programs able to modify a mesh, shrink it or even reduce the triangle count.However those usually still fail to address the problem at hand.Required details go missing and sometimes entire shapes change in important spots.A normal FDM printer comes with a 0.4mm nozzle and is capable of 0.1mm layer hieght with realitve ease.There must be program or service that utilises this properly to create new and in size reduced model.It is just a total pain to use 3 or 4 different programs to modify a simple lithopane just to get some custom text onto the stand.Same for creating multiple print jobs for it as it often results in bad adhesion.What I really would I guess is something where you enter your prefered layer height and max resolution based on nozzle size to get an optimised STL in return.I know your nagging question already: Why bother?1. If you have a STL file of less than 1mb and make some simple modifications with Blender, Meshmixer or whatever, then you can end with a file of way more than 20mb in size and with a complexity that was nowhere in the original."Fixing" a bad file with these apps is easy but again result in massive file sizes or massive loss of detail.2. Mechanics...It really makes no sense at all trying to make your printer create structures finer than 0.2mm - you just won't see it with your naked eye anyway.Especially complex, scanned objects often result in perimeters that enlarged look like someone was holding a running jack hammer while making the perimeter.In return your printer can create quite similar sounds and most importantly the print time goes up for no good reason at all.3. I just prefer simple and clean models.I want to be able to make simple adjustments to a simple object without the need for 32GB of RAM and a server tower to house several CPU's.Is there any such app or service already out there and I just missed it?

Question by Downunder35m  


How can i connect Ardunio uno and rc480 receiverreceiver

Hi if got a ardunio uno board and rc480 receiver with remote and mks stepper controller need to move a gantry up or down using the remote using a nema 23 stepper motor can any one help

Question by TheunisN  


12v battery low voltage disconnect with relay? Answered

Could i make 12v battery low voltage disconnect with relay and resistor? I was thinking if put resistor in series with relay coil i could lower current so relay would barely work on 12v but when it drops to 10v voltage after resistor would be so small that relay would disconnect

Question by Cekpi7    |  last reply



TR-8 Aftermarket kit, TR-36 "Overkill"

I know this works for cars, so I decided to put an extreme spin on KILLERK recent TR-8. The majority of the body is based of the TR-8, but as you can see I added a little different styling to the handle which is also used to support the heavy turret. I added a bit more of a stock to the original but kept the mechanics the way they were. (can't mess with perfection) The turret itself has a ratchet, similar to the TR-8 which allows the turret to only "wind up" in the correct direction. The turret is also attached the same way as the TR-8 with a socket joint in the grip of the gun. I threw some tactical rails on the sides of the gun to try to hint at capability with attachment but the turret is kind of blocking any attachment you would put there. Overall the TR-36 Overkill feel awesome (heavy) and with that phenomenal power and range you would expect from any turret gun. Tell me if you're interested in an ible' and I'll start working on making one.  Thanks for looking! JonnyBGood

Topic by JonnyBGood    |  last reply


Anode and cathode metals? (For electrolysis)

I want to seperate some water to get Hydrogen to play with, so I made a little electrolysis device with a 12v power supply. The only problem is that I have no idea what to use as the anode and cathode! Could I just use screws? Or pennies or something?

Topic by Login258    |  last reply


Washing machine motor on an electric vehicle?

Hello, i already asked a question about a car starter as a Motor for my Electric bike project. I got bad news from the answers, so I wanna use a washing machine motor.  My question is, do i need 240V to power it? Or it has like a transformator in the washing machine that makes the voltage lower? I never opened one..

Question by dsirotic    |  last reply


Can I hook a home theater subwoofer to my cars stereo system?

I have a 1999 Jeep Grand Cherokee Limited with an aftermarket Jensen VM9512 in-dash DVD receiver. Can I hook up my subwoofer (Sony SA-W2500) to the receiver and use it successfully? I don't want to buy another sub. What I have to work with is a long enough cable to connect the sub and the receiver and a 12-volt DC - AC inverter. I'm not sure if the 12-volt plug in the back of my Jeep is turned on and off with the ignition or not, but the subwoofer has an automatic on and off mode and the power inverter is just ether on or off. Help? :]

Question by mooseman93    |  last reply



"Meow", the joke that never gets noticed!

    Okay, the joke I am going to be showing you is called "Meow".  It was invented by my brother in 8th grade, and it is absolutely hilarious! Oh, and by the by, you need to be able to keep a straight face for this joke, or it will not work.     So, the joke is very simple. You just insert a subtle "meow" into your sentence when you are talking to someone.  Example:     "Hey, man! How are you doing?"  "Oh, pretty good, meow."  "That's great."  "So, meow, umm, have you heard of the concert coming to town? meow."  "Yeah, I've heard of it."  "Are you going? meow."  "No, I can't."  "meow. Well, that sucks. meow. Well, I'm going to the concert. meow."  "Well, see you later, I have a bus to catch."  "Okay, meow. See you later!"      It really helps to make the pitch of the "meow"s to be the same as the sentence before or after.  My brother had to do a speech in front of the class, and he said "meow" FIFTY-TWO times in the the speech, and nobody noticed!

Topic by eulaliaaaa!    |  last reply


Is there ANYTHING I can use old dial up modems for (other then dialing up the internet)?

Any old, or unique ideas on what I can do with them?  I have one that is fairly fast (an old cable modem) one that is medium fast (an old DSL modem) and one 56k plain vanilla dial up.

Topic by Goodhart    |  last reply


Can I use 60ppi polyurethane to filter solder smoke?

I am going to make myself a little rig. Two fans with some kind of filter sandwiched in between. I was wondering if polyurethane filter would work because I saw it and it was extremely cheap. 60 ppi seems like the best filter quality I can find. Then again I don't really know what I'm talking about. If someone could explain to me why this is a bad or even a good idea that would be appreciated. Also any recommendations on anything else I should use instead. :)

Question by Inblackandwhite    |  last reply


which is the positave terminal on a dewalt 18 volt battery?

Dewalt battery terminals are not marked, I need to know which is which

Question by popop1111    |  last reply


Internal server error. I'm alone

After 4 days to try to upload a file i have always an internal server error message. How we can fix that ?

Topic by Yannick99    |  last reply


Legal and copyrights confusion.

Hey everyone, I love instructables and I've been working on my own tutorial for the last few weeks. I am not far from publishing the instructables. Recently it came to my attention that I might have some legal/copyright issues. I built my DIY using some parts I took down from other products that are still on sale. One of these parts is copyrighted but not patented. I was wondering, due to the DIY and instructables nature if that would be an issue for me? I am not reselling the DIY or pushing people to do the same as me and even give indication to future makers about how to obtain that part legally. I cite all the sources of the original product from which I borrowed the parts. Would it be ok if I publish my instructables like this or should I avoid talking at all about the "borrowed" parts? Also, if a newspaper or magazine wanted to publish an article about my instructables, would granting them sole publishing rights interfere with using the "borrowed parts" that I talk about above? Would I even be able at all to grant them these rights, given the general terms of the CC license (Non-commercial share-alike)? Does this CC license allow anyone to publish an article about my instructables without my written consent (print and online), so long as they cite the sources? Thanks in advance for helping me out, I'm a bit confused!

Topic by twinbirder    |  last reply


CDROM Motor as a USB Controller - Is it possible?

Thanks for the replies. Sorry, I will try and explain better...I have dismantled a few CDROM drives and stripped out the stepper motors that move the lens around. I wanted these to make a mini laser engraving machine (which I have all the parts to do now, but that's another project)I am also making an arcade cabinet and was looking to make my own 'spinner'. The spinner acts like a mouse but with only 1 axis. I figured that it should be possible to use the CDROM stepper motor as some sort of input controller, but getting it's electrical output converted to a digital signal is completely beyond me. It will require some sort of USB controller board obviously. I would be surprised if it was impossible to do.I asked the question partly because instructables was asking for suggestions/challenges and maybe I posted in the wrong place.Something like this USB joystick controller board in the images is what could be used to get a signal to the computer. It is quite basic and accepts on/off signals from microswitches in a joystick (left, right, up, down, fire etc).The bit I have no idea about would be getting a stepped on/off signal from the motor(generator) to the board when the motor(generator) was being turned. It would also be critical to know whether it was being turned one way or the other.Once that signal gets to the board (assuming the board is fast enough to read the fast on/off signals) then it is down to the program running on the computer to do what it will with that information, and that part is not what concerns me here.As you can probably tell from my terminology, electronics is not one of my strengths :)And yes Jack A Lopez, using a stepped motor as a stepped generator. Basically that's what I'm asking how to do and if it is possible to know when each step happens and in which direction. :)

Topic by DaddyWio    |  last reply


L298N - NodeMCU / D1 Mini - DC motor 12v

Hello,I am new in this area. I am struggling to make a dc motor to work forward and back with 2 buttons a L298N bridge and NodeMCU or D1 mini. I look every where on internet but i dont find a good example to help me. Please can somebody help to tell me how to connect all this toghere and if is posible the code ! I am all ready strugling for few days with this :( .

Topic by eduard_niculita  


Elementary School (K-5) Teachers

Do you teach at the elementary level? If so, this is the place for you to introduce yourself and connect with other K-5 educators. Where are you from and what grade level(s) do you teach? Say hi and share something exciting you did with your students this year or project ideas you have for next year. :)

Topic by WeTeachThemSTEM    |  last reply


Has anyone ever built their own rooftop luggage or cargo box?

I have had a couple and for 2 & 300.00 bucks or more, there's really not much to them. It's just a hollow hinged plastic box, made to be a little aerodynamic and strapped to an existing luggage rack. I find it hard to believe that a home made version couldn't be created as sturdy if not sturdier, hold more and last longer. I was thinking maybe pvc, conduit, or even wood framed. Just curious. Thanks in advance for any helpful input.

Question by SAWWAS72    |  last reply