Need a short distance range finder (<1m) that is 5v and puts out a 0-5v signal based on distance?

I'm trying to find a range finder that can measure distances less than 1 meter and puts out a 0-5v signal based on the range. It needs to refresh quickly and be accurate to +/- 2 cm. It is measuring distance to the ground which will be pretty flat. Thanks in advance for guidance. 

Asked by LosV2 2 years ago

Doornob touch sensor

I took apart a stud finder to see how it worked. Did a quick google search and figured out they work similar to tough sensitive lamps (capacitance). So after soldering an on off switch to replace the push button on it, I taped it to my door, and fine tuned the sensitivity wheel. Now when someone touches the doorknob (on either side of the door), It lights ups.

Posted by boggysandman 9 years ago

Finding an old instructable

Hi, a while back I saw an Instructable on how to get loads of worms out of the grass using electric rods set up in a circle. I am ready to make that but now cant find it on the site. Does any one remember this or tellme how to find it?

Posted by dcascario 3 years ago

Interested in building a 'remote finder.' Some questions regarding what I would need.

Greetings, fellow Instructable subscribers. My name is Ron, and I am interested in building a 'remote finder.' A little background about myself: I have little to no technical experience with building and/or programming. I am a complete novice. However, I am very eager to learn how to make my own nifty little gadgets. My first project idea is as follows: I would like to make a tiny device that I could adhere to any small electronic device which could easily go missing. Ideally, it would make a high-pitched noise and emit a bright light which would be seen assuming that it was, say, under the couch. It would also be paired with a remote control which could be put on a key chain. I've read through a few different tutorials here involving Arduino and 555, but I'm still not wholly sure where I should begin this endeavor, or how to make the device as small as possible. So, good people of Instructables, how would you recommend I go about creating this device?

Posted by rswar2214 5 years ago

How to identify breaker for a currently dead circuit? Answered

There is a circuit in my house which has become unpowered, but I can't find a breaker for it.  None of the breakers in the service panel are tripped (yes, I know what that looks like), and the two labelled "not in use" don't affect this unpowered line (I've cycled them both a couple of times).  The circuit has two GFCI outlets on it; both are unpowered and the TEST buttons have no effect (I've tried RESET, of course).  The circuit also has an overhead fluorescent panel, and an outside security light, neither of which are working. I thought I could use a circuit tracer (a.k.a. breaker finder) for this, but what I've read so far indicates that they only work on active lines (i.e., so you know which breaker to turn off). Does anyone have a non-obvious suggestion for how I can find where this circuit is turned off?  Or could I use a circuit tracer for this, even though it's unpowered?

Asked by kelseymh 7 years ago

handheld direction finder

Hi - I'm looking for a project to build a handheld direction finder.  I would think you could do this using radio frequency.  Basically, I'd like two parts: the finder and the findee.  The finder would indicated the direction to the findee and that's it.  Not sure exactly what you'd call that... Thanks!

Posted by stevieruns 6 years ago

Stud Finder Circuit Diagram

I am looking for a circuit diagram for an electronic stud finder (the type of finder that measures the density of the wall rather than a metal detector).  Can anyone point me in the right direction? Christopher

Posted by willowtaylor 7 years ago

Modify the ultrasonic range finder sensor - your opinion ???

Hi ... I would like to know your opinion about this ultrasonic range finder sensor. I bought this "JCB ultrasonic distance measurer". I bought it for it's ability to measure up to 18m. I tried it ... and happy with the distance ... BUT ... a realised few issues (for me). 1. I think, it use 2 pulses to make the measurement. It's like ... Tuk - Tuk ... end then cca 1 sek is the result. 2. when I move ... it will NOT tell me the results ... probably, because of those 2 impulses - I think, the device is comparing those two TUK TUK ... and if there is a difference, it tells me ERROR. How ever ... my question is ... if I would take out just the sensor, do you think, I could make it to run only with one TUK - to be faster ... and do you think, then I could make measurements while moving ??? (just to show me the actual distance ???) I would like to make something like the arduino PING sensor ... but with greater distance. EDIT : I forgot to mention, that I want to use it with Arduino ... I don't need the device to work on its own. I would just like to know, if the sensor on its own (taken out of this device) + arduino could measuring by movement and with the same distance (max 18m) ??? Looking forward to your opinions. Thank you. zholy

Asked by zholy 8 years ago

How to make a search recpie by ingradant thing? Answered

I have no knowledge of this kind of stuff. however, I can use the computer very well, except for scripting + Html. i'm not using it for recipies. whoever helps me can possibbly work remotly together. scince i'm 13, you won't get paid, but it'll be fun! (if your 13 too or close 2 that, and my parents allow, we could work together, face2face.)

Asked by milkywaybar 8 years ago

Ground Penetrating Gadget

Hello, out there, I would like to find how to build a ground penetrating gadget. I think there are a lot of 'us' would like to have something that can 'peek' underneath the surface of the ground, not necessary very deep. For example, such a gadget that can help fossil hunting tremandously. And it does NOT have to go all the way to Ground Penetrating Radar. As long as it can detect the differences between the matrix and interested object up to say 50 cm in depth, it will be good enough. And it doesn't matter what physical principle is used: GPR, ultrasound, electrical resistance or capacitance, ... (whatever). What I have in mind in such gadget would be tied to one of the shoes (so, it must be very light weight), using wifi to transmit the signal to iPad/iPhone so that the user can just walk and know the place to dig. Any help or comment will be greatly appreciated.

Posted by DinoDragon 6 years ago


My Dishnet just got blown over by wind/rain. It will take possibly weeks for them to come out and re-point the dish again. Is there a way to make your own Satelite finder? We live in a rural location.

Posted by debrandw246 7 years ago

is this usable as a sond amplifier? Answered

I have this lm324 chip from a old stud finder, i searched for a datasheet and found this: it says a op amp, so will it work as a audio amp? sorry. i have never used ics before, and i dont know how to really read datasheets much

Asked by zack247 7 years ago

Lost item finder?

Is there some instructable for this? Basically, just a penny sized sticker that can be placed on any item. If lost, then a device could easily scan for them (5 feet radius range, maybe) I've searched for systems like this, but they're all expensive.  It should be pretty simple, maybe passive RFID tags, and some kind of device that detects if it is closer or farther. I've checked on reader, but any cheap ones are in the $160 range and 3 inch distance. Long distance ones are like 500 and above. Except readers aren't really necessary. There isn't really any information that needs to be read. Just a way to tell if the signal is closer. Something like that could probably made in the $20 range but i wouldn't know I'm asking cause I lost the memory card for my camera (case and all). It was sitting on a desk, then it wasn't. It had some vacation photos that i hadn't transfered to PC yet. It was a grueling search, and I couldn't find it.  At some point in our lives, everyone needs something like that. Losing something important sucks, expensive or not.

Posted by alester333 7 years ago

some questions about old crt camera view finders

I acquired a pair old crt camera view finders from an electronics surplus store, but before i go hog wild with my soldering iron i have a couple questions. how many amps dose one of these things usually draw? will goofman's mini tv instructable work with any crt or do some crt's not work?

Posted by clasic_traveller_diehard 9 years ago

Rangefinding device for my dog, (telemetry/radio/range finder/outdoors) Answered

I know a fair amount with electronics, so i was PRETTY frustrated when i looked around online for a method of rangfinding that i could build into a small device. I have been wanting to have a project for awhile, so i am not just going to buy one. Anyway the inspiration comes from me and my dog, you see, hes a Jack Russel, and very eager, he loves to chase rabbits but i can never find him after he has run off into the forest, by that time he is too far away to hear me.I want him to chase rabbits because he loves it, but i can't use a lead because it gets caught on everything(Trees, plants, thorns and general vegetation).So i had an idea, if i could just have a device that would tell me how far away he is, then i could just use that to work my way towords him.The process seemes quite simple to me, give him a transmitting collar, and have a device that recieved that signal, and could use the basic distance = speed x time sum to work out how far away he is, then display it. Apparently, either nobody has ever tried this, or i just ain't searching for the right thing.I know radio waves seem to be optimal, seeing as he won't be more than 1KM away from me, but again, i don't really know where to look to find the parts, or how to build the thing in the first place. So please, if anyone could help me out, please do.My physics teacher is a real **** and refuses to help me.So you guys are all i have to ask. Thanks. /James PS: My dog would be REALLY happy too, he hates being on a lead all the time, and if i could get this done, i will post pictures of him, apparently hes really cute.

Asked by Nero57James 7 years ago

i have a nerf nite finder that i have modified by removing the ar and the light (i am trying to make a sniper out of it)

I would like to   add a stock  but i need help aand some other mods to make the ultimate nite finder and i dont know how to paint with out ruining the gun  update: i have put a recon barrel on it :)

Asked by joh54 7 years ago

I'm trying to add 2 knex guns to my nerf nite finder. Answered

Ok so I wanna add two of the same knex guns to each side of my nite finder. Help? im not looking for range all that much i just want to of them on my nf with no glue or stuff like that. just knex

Asked by ~Z~ 8 years ago

How do I reset all Finder preferences if I have changed the folder view settings in Mac OS 9? Answered

I own a 2nd hand iMac G3, and one day I was exploring Mac OS 9's folder view preferences, when I accidentally set Finder's icon view settings to 32x32 and when I booted back into OS X, opened up a Finder window and looked in my OS X applications (because Mac OS 9 and Mac OS X boot from the same hard drive), all the icons were stuck at 32x32. Any ideas on how to fix this? I've tried deleting the OS X Finder preferences, deleting all the .DS_Store files and OS X is still showing icons at 32x32. Can any one help me to fix this without reinstalling OS X Jaguar? (I don't have any install disks).

Asked by erikals 8 years ago

DIY wi-fi signal finder

Hi there, I came across the schematics needed to make one of these nifty devices a while ago, but didnt bookmark (idiot) and now I can't seem to find it anywhere... Anyone know how to make one of these? :) Thanks in advance. Cheers Celso

Posted by setekh 10 years ago

Turn camera view finder into rc in?

Is there a way to take a viewfinder from an old camera and turn it into a monitor with RCA in? I have a dvd player that  I use to play music off a usb stick and I don't want to have to have a large tv hooked up to it.

Asked by neeley 5 years ago

Range finder using RF and an arduino?

One of the projects I've been spit-balling for a very long time requires me to be able to build some sort of range finder (if I'm using the correct term). Basically, I would like to create a "finder" unit and a "hider" unit[s]. My thought would be to us RF of some sort, so the "hider" unit will spit out a certain frequency, that the "finder" will pick up and react to (in this case, speed up the blinking of some LED's and turn some servo's to set levels). This doesn't need to be exact. So long as I can detect a decent range so I have a cold, warm, warmer, and on fire points to use, it'll do the desired deed. Price is another factor, as I would like to keep this around the ballpark of $30 per unit.  Thanks in advance!! 

Asked by DoctorWoo 3 years ago

how does one make a whistling key finder, i.e, you whistle, it whistles back

Basically, when you've lost your keys, all you do is whistle and it whistles bach at you. What materials would i need for such a project.

Asked by papawemba 8 years ago

Scholarship Idea: Lost Item Finder

By incorporating a metal detecting apparatus, the Create could constantly trek through the house collecting lost coins, jewelry, pain-inducing metal debris, keys, anything having metal and being small enough for the Create to collect. Larger Items should be easy for you to spot anyway.

Posted by Holeinmysock 10 years ago

3D printer? Answered

The FlashForge Finder is currently $500 on Amazon, I have not tried it myself, but it seems ok, for that price anyway.

Asked by 3designrox 1 year ago

would anyone be willing to build a Radio Direction Finding device, for transmitter hunting? Answered

I wanted to know if anyone would be ableto make an instructable on how  to build a device for tracking radio signals, or a amateur radio directional finder (ARDF). my electrical skills are mediocre at best and i do not have the ability to buy a device like the HANDI-Finder, so an instructable will help a lot. the two picture are of the handi-finder device from i dont understand it at all. i hope someone will know what to do with it.

Asked by banlui 7 years ago

filming the view finder (ground glass)

Hello all, I'm finishing up a project that I've been siting on for a while. I have always been intrigued by the strange dimensional space provided throuhg the old TLR viewfinders. I wanted to be able to film with that quality so I have built my own simple slr with a large view finder and am about to mount my 5d to it with a bellows in-between. I wanted to know if anyone on the message board had seen this done before or seen footage from a set up like this. I'll post pics and a link to vid footage once it the project is complete.

Posted by talentfalcon 7 years ago

Recess a medicine cabinet? Never cut wallboard before.

I have a stud finder, a friend with proper type of saw for wallboard. Need instruction

Asked by 8 years ago

Can anyone really make legitimate night vision using a camera view finder?

I've seen tons of hacks with theatrical gel sheets and high powered IR lights, but is it possible to amplify the light from a view finder and make actual night vision, not a "night vison flash light" but somewhat, military grade night vision.

Asked by Houston1 5 years ago

Small Radio-Activated Alarm / Key Finder

Hi Guys, I'm quite new to electronics (I'm a programmer by trade), but I'm a quick learner. I want to make a sort of radio Key-Finder (similar to something like this), but I'd like the "receiver" end to be rather small in size.  I'm trying to figure out how to go about starting something like this, but I would really appreciate some direction. Some questions: 1.)  Are there products that I can take apart and re-purpose for this? 2.)  Could something like this, for example, be a starting point for the radio "receiver" end? 3.)  I imagine that I would need at least a small battery (flat watch battery?), perhaps a small flat Piezeio-Electric buzzer (like one of these?) and the radio receiver. 4.)  Is this a project that needs something like an Arduino board to handle any logic? 5.)  Can I re-purpose a car alarm remote for the "remote" piece? Thanks for any thoughts and direction. Dan

Posted by thefonk 5 years ago

Waist Level Finder peripheral for a compact digital camera - Street photography!

Posting to here and cross-posting to Photography! Hoping someone can help. I'll be traveling to Japan in a month, and I have a simple point and click digital camera. I was hoping to get some candid street shots as well as in the stores/etc but I've heard people get a little nervous when foreigners are running around photographing stuff. I was researching ways to be a little more inconspicuous with getting photographs and one of the ways I found was a waist level finder. Basically, you can take photographs from your waist, and there's a little screen that points upwards to let you see what you're shooting. Basically I was wondering if anyone had any ideas how to build one of these things that I could attach to a point and click camera? I imagine it'd be pretty ghetto, like cardboard and mirrors and tape haha. Any ideas would be much appreciated, thanks!

Posted by jsoh 6 years ago

Waist Level Finder peripheral for a compact digital camera - Street photography!

Posting to here and cross-posting to Burning Questions! Hoping someone can help. I'll be traveling to Japan in a month, and I have a simple point and click digital camera. I was hoping to get some candid street shots as well as in the stores/etc but I've heard people get a little nervous when foreigners are running around photographing stuff. I was researching ways to be a little more inconspicuous with getting photographs and one of the ways I found was a waist level finder. Basically, you can take photographs from your waist, and there's a little screen that points upwards to let you see what you're shooting. Basically I was wondering if anyone had any ideas how to build one of these things that I could attach to a point and click camera? I imagine it'd be pretty ghetto, like cardboard and mirrors and tape haha. Any ideas would be much appreciated, thanks!

Posted by jsoh 6 years ago

How do I recess a medicine cabinet?

'''''''I have a stud finder but never cut wallboard before. Two girlfriends have proper saw for the job. Just need instructions

Asked by 8 years ago

how to make a cheap remote and key detecter ?

I am trying to make first cheap and portable key and remote finder . please give me some suggestion .

Asked by Er Varun Goyal 3 years ago

Find picture?

Greetings, i have only one part of picture, i tried like 7-8 picture finders even google, can someone help me to find whole picture ? Full picture size is 800x452

Asked by PlkT 1 year ago

My nerf guns.

Hey I was wondering what people thought about Nerf guns? I have these. Maverick. Nite Finder. Longshot. Magstrike. Vulcan. Firefly. The game. Longstrike. Deploy.

Posted by Vynash 9 years ago

Creating custom plastic project boxes/cases and the screws for them?

For the awesome people that look at the answer sections to give out help: yes, this question is related to my other. I'm looking to make a hide and seek-esk device, and I would like to make a meter to hold the finder system. Said finder system will be custom made. As such, I would like it to look a touch more professional, mainly, but adding screws to be able to screw the parts together (kind like a TV remote). I know it's probably a stupid simple answer that I just spaced on, but if someone has it, that'd be awesome!!

Asked by DoctorWoo 3 years ago

Calculator Programs for Math

I've been working on some programs for my calculator recently and have decided to share them. I made these myself from scratch. If you want to modify go ahead just credit me. Don't sell them. And don't use them in math class if your teacher says not to. The programs are a follows: a quadratic formula solver, parabola solver, slope of a linear equation finder, and y-intercept finder. The programs work on TI-83's and TI-84's. If you have questions on how to use them or how to put them on your calculator please leave a comment!

Posted by sardines454 10 years ago

How would I go about making an 'item locator'? (like a remote control finder/key finder)

How would I go about creating an 'item locator' such as one used to find a remote control or car keys. I've been interested in setting up a system for all the things I keep in my storage area so that they are easily found by pressing a button on a panel or 'base' and then having it locate the actual item (which will start beeping/flashing, or what have you). I'm curious as to how these typically communicate with each other since I'm a beginner in electronics.?

Asked by pyrofyr 8 years ago

I can not publish my new project

I tried to publish a new project on 10.11.2009, but i can see it under the "YOU" option only, nowhere else, nor in the own finder o fthe page.

Posted by Max Headroom 8 years ago

My nerf nightfinders barrel is glued together. How do I get it apart? Answered

I want to do the air restrictor mod for my nerf night finder but the all of the parts of the barrel are glued together. How do i get it apart?

Asked by DBMods 7 years ago

co2 powered nerf gun

Well I have been working on making a co2 powered nerf gun (NITE FINDER) for a couple of weeks now, with no success. So If you could give me ideas, or just make one it would be appreciated. ~thank you~

Posted by KrispyKr33m 9 years ago

Drilling into walls and not electrecuting myself

So these walls have a sheet of wood on them, as in, original wall --> then sheet of wood, painted. Can a stud finder still work with this wall setup? I dont want to start drilling and end up electrecuting myself and or ripping the walls up with too much weight. I plan on doing the hungarian shelfs.

Posted by bronevaya 11 years ago

I cracked my 3 inch LCD screen on my Fuji there a way to make a view finder?

 Its a fujifilm 10 mega pixel digital camera, when on the 3 inch screen turns white and crack is black. is there any chance i could replace it under $100.

Asked by RunningRiot42 8 years ago

Resistor Calculator for electronic enthusiasts

Hi to evebody. I would like to share a tool which was developed for my own needs. For some time I recently need to obtain not standard resistor values with rationed precision from standard E24 series of resistors. Unfortuantely I don't find really good and convenient tool to do it. Finally I decided to made Resistors Finder for iPhone. I did my best to create simple, nice and convenient user interface and fast searching algorithm. Resistor Finder was just released yesterday on App Store. If you want a  free copy please PM me for promo code. Only 10 promo codes available. It will be nice to hear some feedback from you all. Any suggestion, critics and feature requests are welcome.

Posted by lyubomyr 6 years ago

Any idea on how to make a camera kind of &quot;eye&quot; for arduino?

Any idea on how to make a camera kind of "eye" for arduino? And NO, I don't want to connect Arduino to a PC nor a laptop. Well, not a actually camera since: 1. no way arduino can process video stream. 2. all I need is a way for arduino to know if anything in front of it (about 90~120 degree field, around 3m distance) has moved or changed, and know where the change is in term of a simple x&y coordinate. So instead of camera view, its more like a radar kind of view I need (the thing we see on movie that have submarine ) All I can think of is to use a huge amount of IR range finder(which only have 1.5m distance :\  ) or Ultrasonic range finder(which can't focus to one point :\  ), and arrange them so they a point outward from the same center (kinda like how old time TV work), so each range finder work like a pixel on the screen for arduino. (I don't need to display it, I just need Arduino to know where the change of environment is) So anyone have a better idea or better device suggestion than what I have? Even something that can only detect 1 axle will be better than the range finder solution. Thanks~ ===================================Update 1================================= While searching for new sensor other than the one I mentioned, I came across this>>> According to the seller: "Camera sensor generates image data which is then processed real-timely by control board and displayed on the screen.", Atmega 32 have the power to process video in real-time? So is it possible to use arduino to process image data?  I mean by adding some filter to the image, filter out anything other than the moving part, and find the position of the moving object.  Is that even possible with the power of Arduino? However with the price of that shield, I can just buy an old Google G1 phone to connect to Arduino and use Android camera to capture the video, process the image data, and send the movement's coordinate to arduino. Just want to find something simpler than adding a extra "brain" (Android) that I need to learn how to program xp.

Asked by ljfa321 6 years ago

Is there an easy way to find a short or open circuit in a car?

I am trying to find a open or short circuit that is on a wire which is in a harness with other wires, on a 1986 Mazda B2000 truck. With so many of you having expertise in electronics, I thought here would be a good place to post my question. Does anyone have any suggestions how to find this open or short-circuit?I am open to the idea of getting a short-circuit-finder. Though I am not sure what features I should look for if I decide to get one. Does anyone have any suggestions?a) Does anyone know if these work well?b) What features should I look for If I get one?c) Do you have any other on a short circuit finder? type, manufacturer, model etcBelow is a link to a site that uses a short circuit finder to find a short circuit, and has information on using one: is a link to a site that tells about how a tone generator is used to find a short circuit, in a home environment (I think this is how most short circuit finders work): found some links that seem to show that it is possible to make a signal generator and tracer, but the pages with the schematics would not load. A list of tools with links to tools and their schematics tracer (neither of these would not load 4-3-09 kept getting message "the Connection was reset."):should have schematic: the signal generator: little paranoid voice thinks this Instructable has some clues to the solution: How to prevent thefts steal your motorcycle for less than US$ 2 Thank-you in advance,

Posted by Jonque 8 years ago

My modded nerf guns

This is my nerf arsenal. I don't have much because I'm just starting out. Although I only have a few guns, I have one of the rarest and most prized guns, the crossbow. All of them are modded except for the blast fire.

Posted by bakenbitz 9 years ago

Whistling key fob helps finding misplaced keys

I am notorious in misplacing my kes. Years ago you could buy a key fob that helped finding misplaced keys. You would whistle and the fob  replied  with a pinging or whistled tune after one or two seconds. The idea was great, but the quality of those things used to be poor. Can someone re-create such design in miniature format?

Asked by kurva 2 years ago

where would i get a nerf gun maverick or nite finder in australia toys r us doesn't have em?

Online and in ebay i can't find any mavericks or nitefinder under about 30 plus p&H cause i want to do some modding or can anyone suggest a simlar looking gun to the nitefinder for cheap Thanks Klect960 Instructables pride 4 life lol :)

Asked by Klect960 9 years ago