Today was the first time i wanted to comment, but found myself confronted with this: "We have a "be nice" comment policy. Please be positive and constructive with your comments or risk being banned from our site." In my personal opinion, constructive comments are rarely positive and positive comments tend to be rather useless. Who thought the statment quoted above is a good idea and can it be changed?

Topic by Xaromir 7 years ago  |  last reply 7 years ago

Servo Position

Hey i was trying to control the servo using joystick(potentiometer). i am but stuck at a problem when joystick is at center servo is at 90° when i move the joystick to left, servo sets at 0° and when i release the joystick it came back to its 90° but when i move the joystick to right, the server does sets to 180° but does not come back to 90° on release the joystick, it sets to a little more than 90° like 100° what could be the problem ? #include Servo servo; int sp ; int js_x; void setup() { servo.attach(3); } void loop() { sp= map(js_x ,0 ,1023, 0, 180); servo.write(sp); }

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

Feedback: thumbs up on the placement of new subscription items

Just wanted to say: me likee. It's like it was when subs were first introduced. Very nice.  Now if only I could get my comments just under that (or even customize it...le gasp! :D ), life would be complete... :D

Topic by Lithium Rain 9 years ago  |  last reply 9 years ago

Love the new instructables lay out

Hey, you guys over in the 'ible offices only ever hear negative remarks so I thought I would throw my two cents your way and let you know that I am loving the new layout and all of your hard work, keep it up guys!

Topic by DELETED_Fuogger 8 years ago

Which wire is positive?

I have an electret mic that I want to use, but it has green and a black wires on it, would green be positive? Or would black be?

Question by Zem 9 years ago  |  last reply 9 years ago

Ultrasound 3D positioning

How would you use an array of ultrasonic sensors to determine the 3d position of an ultrasonic transmitter. Basically i want an ultrasound transmitter on my hand that gets picked up on an array of 5 or so receivers that outputs the position via usb.

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

Are positive comments votes ?

*same as topic*

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

sidecar wheel position

I've looked up sidecars on google and found lots of information for sidecars on vehicles that have front steering only in which case the sidecar wheel tends to be positioned parallel to somewhere between the midpoint and the rear of the vehicle, however if the vehicle has both front and rear steering would the sidecar wheel be best positioned parallel to the exact midpoint or not?

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

GPS position transmitter? Answered

I am an aspiring pilot and would like to build a Personal Locator Beacon. I want an arduino type setup that would take my GPS data and transmit it every few minutes for 5 or 10 miles (or more depending on the legality) to a receiver that displays my last known position, my distance away, and my direction (from the receiver). Is this possible? It would also be nice to transmit my position via Morse code too in case my receiver was broken or could not be found.

Question by conrad2468 9 years ago  |  last reply 9 years ago

Resistor negetive to positive?

Hey. I'm changing all the LEDs in the switches in the car. All is going well except one switch, there is 1mm distance between a circuit board and the LED. The LEDs are 12v no resistors. I'm using ultrabright red LEDs that need resistors. However, I'm sure I've seen circuits that resistors go on the negative and positive leg before the LED. Would this work or would the LED still blow? Thanks.

Topic by Josho 10 years ago  |  last reply 10 years ago

Positive affirmation box

I am trying to make a positive affirmation machine so that when my students turn in homework it will either give an audio message or display a message that says something good.  I know I need to build an optical sensor but I was wondering if there is a build that you can suggest that I can modify?  I have moderate skills with building electronics and access to plenty of materials but I am lost as to how to start.

Topic by Mr.E1 4 years ago  |  last reply 4 years ago

Why are "ground" and "(-)" often referred to as the same thing.

Ok, so, I am very confused with wire colors, ground and (+) and (-). I NEEd someone to answer me. What I have read is that electricity flows from (-) to (+). However red wire is always connected to (+) and referred to as the "hot or "live" wire, and (-) is the ground. This seems backwards to me. Ground wires go to ground because it is highly positively charged, It just seems like there is contradictions. I really need this cleared up. Thanks in advance!

Topic by Ampix0 6 years ago  |  last reply 6 years ago

How to positively charge something? Answered

I was sitting here in the middle of a thunder storm and I had a thought, usually the clouds are negatively charged during a lightning strike, so, if you used a large cannon to blast a positive iron ball into the air, you may be able to get lightning to strike it, then collect it to see what the lightning did. So, you would you charge a cannon ball? 

Question by jj.inc 7 years ago  |  last reply 7 years ago

how to convert negative pulse to positive

Hello.. I built a transistor scr to turn on leds in my car from my remote.. my remote uses negative pulses to turn on and off... now the problem is that the scr needs a positive pulse to turn on but it uses negative to turn off,, so turning it off isn't a problem.. Im pretty sure I can just use a transistor to do this.. here is the schematic I used to build the scr...http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... fig 75b... is there a way to modify this circuit to make the turn-on negative or just a way to use another transistor to make my negative pulse positive? I could easily use an automotive relay to do this but im trying to make this as small as possible and its still on the breadboard.. I want to get this figured out before I put it on pcb.. thanks for your help

Topic by aclark32 5 years ago

Do speakers have a Positive + and a Negative - like LEDs? Answered

I'm planning on hooking up a small speaker out of a cheap toy to a 3.5 mm Mono jack that will go into my mp3 player but I don't know if it matters which wires go where. Do speakers have a Positive + and Negative - like LEDs? If they do, how would I find it out? Thanks

Question by 9 years ago  |  last reply 9 years ago

rewired?is brown or blu positive?

Question by julesjujujulie 6 years ago  |  last reply 3 years ago

Which is positive, negative and ground? Answered

 i cant figure out which prong is which just by looking and i dont have an expertise in electronics, so if you guys could help that would be wonderful, heres a pic 

Question by gantyman 9 years ago  |  last reply 9 years ago

2 Position Servo Controller

I need some help, I am trying to create a damper control using a servo and a 555 timer. Is there anyway that you can use a 555 timer to make a servo move back and forth between 2 positions (0 degrees and 90 degrees) with an with and on/off signal and not a pot? So when the thermostat sends power, the damper moves to 90 degrees, then when the thermostat shuts off the servo returns to 0 degrees? Thanks for the help in advance. -Ryan

Topic by WingmanSVT 7 years ago  |  last reply 4 years ago

ME Position at IDEO Chicago

Global design and innovation consultancy IDEO, in search of a creative, cutting-edge senior engineer to help bring user-centered designs products and services to life. Start date: immediately. Location: Chicago. YOU: * Are naturally curious, creative, and on top of technology trends. * Are an inspiring engineering thinker and doer who works well with individuals of varying (i.e., non-engineering) backgrounds. * Are an engineer at heart, but like the idea of embracing tasks as varied as building prototypes for field-testing in Kenya to helping a large Midwestern consumer goods company plan out a strategic roadmap for a new product category. * Are a good visual and verbal communicator who can explain complex technical concepts simply and clearly to clients—and fellow team members. * Have deep engineering expertise (3-5 years) stewarding innovations from concept through launch, or analyzing and solving complex problems. * Love creating looks-like/works-like prototypes and have relevant skills such as fluency in 3D CAD, basic skills in interactive electronic prototyping, good shop skills etc. * Hold a master’s degree in an engineering or related field or have equivalent professional experience. * Have a diverse and eclectic background that will add new perspective to our team. IDEO CHICAGO: * Is a design and innovation consultancy that uses human-centered design-thinking to help businesses and not-for-profits grow via the creation of new-to-the-world products, services, and environments. * Provides a creative playground for just a few of following disciplines: Human Factors Research, Engineering, Industrial, Communication, Business, Environments, and Interaction Design+ Is a studio environment that is highly collaborative and unconventional, that encourages and supports new ideas, and that is playfully serious and non-hierarchical. If you like getting your hands dirty, you’ll love our organic rooftop garden. * Is known for its award-winning work in the areas of branded experiences, energy, financial services, health and wellness, consumer products, and food and beverage, among others. * Counts among our diverse clients: AT&T;, PNC, McDonald’s, Target, Ford Motor Company, and Bayer, among others. * Is a 55-plus-person studio in the heart of Chicago’s West Loop. If this sounds like a good professional and personal match, please provide us with a portfolio of previous work. The portfolio may include—but doesn’t have to be limited to—CAD images, technical drawings, part/prototype pictures, and mathematical and technical simulations. We’d also love to hear about your hobbies, passions, and creativity outside of engineering. We’re looking forward to meeting you. http://www.ideo.com/culture/career/senior-mechanical-engineer/

Topic by mweibler 8 years ago

convert negative pulse into positive using a transistor?

Hello... ive built an scr using transistors to turn on leds in my car with my remote.. my remote uses negative pulse.. now the scr(latching transistor) that ive built turns on with a positive pulse and off with negative.. so turning it off is not a problem.. I need to change the negative turn on pulse to positive to turn it on though. I know theres a simple way using a transistor to do this, but im still learning and my knowledge of transistors is still limited.. here is the schematic I used.. figure 75 b. I followed the schematic and it works just fine..http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... thanks for helping me out here

Question by aclark32 5 years ago  |  last reply 5 years ago

Spark gap ions? Help Please? Answered

Hi! I was wondering what kind of ions are emitted from a spark gap when in use? I have seen alot about negative ions and positive ions, but could someone shed some light on this? Also, how harmful are these ions to the body and what exactly are they made of? THANK YOU ANY sources that help explain this will also be appreciated! Again, THANK YOU

Question by transistorguy 8 years ago  |  last reply 8 years ago

Comparator Inputs ?

On the two inputs of a standard comparator op amp (say for example  LM741)  they usually  connect resistors from both the positive and negative voltage rails .Why do they do this and how does this work . This has been on my mind for a really long time . Could someone give me a really detailed explanation maybe with images if possible , cause this would be really helpful in the building of my next project .Most of the tutorial videos out there , i don't understand either. Thank you in advance  

Question by Strontium 5 years ago  |  last reply 5 years ago

Which way does electricity flow? Answered

Does it come from the negative terminal of a battery, or the positive terminal?

Question by PKTraceur 10 years ago  |  last reply 3 years ago

positive charges are considerate as immovable why ?

Question by PrabhasS 2 years ago  |  last reply 2 years ago

Positive Van de Graff Generator?

I know that a Van de Graaf Generator creates a negitive charge if you use a rubber belt, But how would one make a positively charged friction style van de graaf generator? What materials would you use?

Question by JohnM703 1 year ago  |  last reply 1 year ago

Is the copper on electric wire negative or positive?

On elecric wire there are two kinds of metal. One is copper and the other is iron. Okay, now on a battery there is the positive side (+) and the negative side (-). Wich wire goes where?

Question by Potaterchip 10 years ago  |  last reply 9 years ago

Position of gyro and iPhone during calibration?

I have a gyro and using an app on the iPhone (tilt meter).  My question may be basic. But does the gyro sit ontop of the phone, while the phone is standing up (see attached) or is the iPhone laying flat (display up) while the gyro is ontop of the phone?

Question by nmsr1196 5 years ago  |  last reply 5 years ago

How to position my LEDs in a circuit?

Hi there, I'm currently doing some soldering, at this moment I got the following: 2 batteries (that both got 1 connector for the output and 1 connector to charge) connected to a 4PDT switch. Half of the switch connects the batteries to the charger the other half (the output) goes to a DPDT switch. It's wired so that the battery that's not being charged is used for the output. The DPDT switch is used to switch between the selected battery and the optional 230V AC -> 12V DC adapter. Now I'd like to add some LEDs, for the following purposes: LEDs to show which battery is being charged - should be on if a battery is actually being charged. LEDs to show which battery is being used - should  not be on if the 12V DC adapter is being used. LEDs to show if a battery or the wall adapter is being used. I thought I'd put one pole of each LED before the switch and the other one behind the switch, is this the right solution? If this is the correct way, would it be recommended (when working with the switch for the batteries) to put the + side of one LED before the switch and the + side of the other LED behind the switch? Kind regards, Niels

Question by Niellles 6 years ago  |  last reply 6 years ago

Battery Wiring?

I have new Li-ion batteries for my mac but i wasn't completely sure on how to wire it up to the old circuitry. I know that "vg" is the ground and the "vp" is the positive. I am assuming "vl" goes to the wire "vl" i dont know what that is thought.  But there is a "vh" spot on the new battery but on the old circuitry there was no wire going to there? Do I solder that wire there? There is also two very thin wires labeled ntc, i can not find a spot on the old circuitry for that is it necessary?

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

Wiring up a filter copasitor?

For my Cold Fusion Project I was told to use a filter copacitor with the isolating transformer and the bridge rectifier.  I have had some trouble understanding this.  The mains AC runs through the isolating transformer and right after that I need to hook up the filter copacitior.  How do I know which is positive and negative.  I know AC alternates between + and - but when I need to hook it up to the rectifier I need to find + and -.  How do I do that?

Question by Kalrag 8 years ago  |  last reply 8 years ago

positive side of a palm treo 700p battery

Question by gucci.bich 7 years ago  |  last reply 7 years ago

How should the skimmer and water level be positioned? Answered


Question by mamaquiggs 8 years ago  |  last reply 8 years ago

Do capacitors have positive and negative terminals?

What are electrolytic capacitors? In what way they are different from normal capacitors? The charge on a capacitor depends on how i connect it to battery,but electrolytic capacitors have one long and short terminal to differentiate between positive and negative terminal. Why?

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

how to - detect right object in right position?

Hello DIYers, I have a small square object (6cm x 6cm) that I must put in a mold, but how it's square, is possible put it in any position, but only 1 is the right one. The reference is a 5mm label in the top. I want detect if the object in the mold has the right position. Actually I have 5 different objects, the difference between them is the number in the label. My idea is use a Raspberry Pi + Pi Camera + openCV. There will be a collection of images for reference and the camera will be recording jpgs (maybe 1fps) and comparing with the images in the collection. There will be a red led lighting, but if the RPi detect the right object in the right position will light a green led. Maybe somebody knows a similar project? is possible with this hardware/software? some recommendation? For better idea, I'm attaching a mock-up

Question by HédelN 1 year ago  |  last reply 1 year ago

Positions available at Instructables (October 19, 2018)

Working at InstructablesIf you don't see an open position that fits you, please don't hesitate to drop us a line and say hi. We are always actively building our network of curious, creative talent with a passion for making. To introduce yourself, please send your cover letter and resume to auctoramentum at instructables dot com with a fun, robot-related subject line

Topic by ewilhelm 3 years ago

HS Tech Director, teaching positions in SF

A friend forwarded this job posting, figuring Instructables users might be interested!It sounds like a fun place to work:Lick-Wilmerding is a pretty cool high school in San Francisco. Bothour daughters went there. They have a full mandatory shop course forall students -- woodworking, metalworking, glass, architecture, etc.This is a job posting for a new tech director.Job posting info here. They also have listings for English, History, and Math teaching positions.

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

Code of determination the position of my finger in a screen

Hello guys I am so happy to be in this big helpful community. So I am student and I love electronics, this is why I am working on a touch screen working with the technology of projected capacitive sensors using, of course the Arduino Unoto determine the position of my finger on the screen and show it on an interactive screen (like the project of the 3D tracking interface https://makezine.com/projects/a-touchless-3d-tracking-interface/). Because I want to know more about this domain also to share this project with the geek of electronics in Instructables and learn more about Arduino . So please guys I need an example of an Arduino sketch to show the position of my finger. I know that's I didn't talk about the details, so if you want to make this project happen , this is my Facebook account ( https://www.facebook.com/profile.php?id=100017432321426)

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

A Third Math Sign - not just positive or negative

I was thinking about a random thing the other week. We have positive and negative signs in widespread and ubiquitous use in mathematics. What if we had a third sign? The number line would look like the one in the picture. It's not even a line anymore. Since I am absolutely dumbfounded as to how even the basic operations would play out in this type of system (although I have a rough idea for addition and subtraction), and nor do I know what the possible applications for a redundant sign could be, I'm just putting this here. Got ideas? Fire away.

Topic by nutsandbolts_64 4 years ago  |  last reply 4 years ago

how to detect sensor position with arduino uno

Hi Guys recently i started use arduino UNO and with simple programs to read from analogue pins wasn't hard. now i'm facing a challenge, as i have a sensor mat 16x16 (rows and columns) i want to read 4 rows and 4 columns i'm trying to use the analogue pins as input for rows and digital pins from (8 to 11) as output i want the program to detect the position of the sensing area such as (row1 colum 4, for example) and give me the number that measured over this area. my code is very bad but i'm trying, specially my background wasn't programming or science. any ideas will be great.

Topic by Najeebgh 2 years ago  |  last reply 2 years ago

Arduino with NXT servo position won't stabilize?

I'm using the arduino PID and encoder libraries to run an NXT servo for position.  Problem is, it won't move quickly to where I want, or accurately, or without oscillating all at the same time (and never for accuracy).  I need it to go to exact encoder points with minimal oscillation or delay (I plan on using it in a delta bot.)  I know it's not the best motor for the job, but 1) I already have enough, it costs me nothing more, 2)they're very accurate, and I know they CAN be run just fine (the NXT itself works great).   I've looked on websites and stuff for tuning, but nothing I found works, because of the weirdness of the motor itself (which can start quickly, but takes up to 400 milliseconds to stop).  The best tuning parameters I found so far are 5.5, 15, 0.75 (P,I,D).     

Question by jduffy54 5 years ago  |  last reply 5 years ago

I am CRUSHED.... :-(

I had finally gotten my "project" (for the gift exchange) finished, well except for some cosmetic touches to make it look nicer then it did.  I tested it for the last time, and a wire crossed and the speaker when POOF in a puff of smoke. This thing has me so depressed at not being able to finish it and get it sent that I am having troubles just getting back in and tearing it all out to replace the speaker and maybe put in a dampener resister to prevent it from happening again......I AM going to finish this one way or another......just wanted you all to know I am having to deal with a lot lately (my Mom becoming ill and maybe needing full time "residence in a facility" and being the only one left in the family willing to do anything, a whole lot has been dumped into my lap since July. But I DO intend on getting this out somehow, but Tuesday...but I am so sorry for this horribly long delay.

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

is there such thing as a servo that comes back to its original position when the knob moves back to the normal position?

Its to use for ailerons on my rc plane

Question by GalaxyX 9 years ago  |  last reply 9 years ago

10 Positive Traits of Aspies. (People with Aspergers Syndrome)

Topic by Lateral Thinker 9 years ago  |  last reply 7 years ago

Which side of the arduino protoshield is positive/negative on this area?

I am just starting out with Arduino and I have been working on assembling the Protoshield. I am about to install the green LED shown in this picture from Make.com but I don't know which way the LED should be orientated because it didn't say in the guide and I couldn't figure it out on the board. If you could please say that 1= positive and 2= negative it would help me out alot. Thanks!

Question by alexh934 10 years ago  |  last reply 10 years ago

How to control more positive current using microcontrollers?

Most microcontrollers can directly control low current  at +5v. Using NPN transistors I can control higher currents, but now negative. My question is: how to switch more positive current (>40mA) than my microcontroller can do directly? The obvious idea is to cascade a PNP to a NPN transistor, but aren't there ICs ready-made for it? More or less like UNL2803A, but using Sziklai arrays instead. What would otherwise be the "standard" way of doing it?

Question by eshneto 9 years ago  |  last reply 9 years ago

Major Work Location/position sensor for a cricket bat

My name is NicholasI am in Year 12 at Parkes Christian School and making a major work that i can track where i am hitting a cricket ball on a bat. similar to what hot spot is and to be able to relay the information on the position to a phone via Bluetooth(video to help with what my idea is) At the moment i have ordered a Raspberry pi for the help transmit the data, EeonTex Pressure Sensing Fabric, EeonTex Conductive Fabric. But i dont know what else i would need so i can get the information of the position to a raspberry pi like what types of thread do i or is there some thing else i need as this is my first time making something like this Thanks in advanced

Topic by Nicholasrsk6190 1 year ago

Turn on certain light positions on a string of lights by controller?

I have a 10 yard table.I want to be able to light up certain locations on the table according to what part number I select. Say I choose a number that I want the 5-10 inch, 22-23 feet, and 30-32 feet ranges lit up to indicate where cutoff are. How can this be done?

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

Is The Insulated Wire In An RCA Cable, The Negative or the Positive One?

I was just trying to build an RCA to USB cable but I am not being able to find the polarities! Please HELP!

Question by mraghib 6 years ago  |  last reply 6 years ago