Instant MPG gauge for OBDII

This is very simple. I want to know how to make a simple (& cheap) instant MPG meter for a vehicle fitted with OBDII (i.e. most recent vehicles) that will plug into the OBDII port.

Posted by monkey-boy 10 years ago

detect earth movement

I live very close to very busy highway.any way to build cheap seismograph to see & record my house shaking when overloaded semi goes by ?? (nothing against drivers )

Posted by swoogydew 10 years ago

Ebony & Ivory - Devil May Cry Guns

 This was my first commissioned prop build as a favour for a friend of a friend. All in all they cost about £15 in materials and took a total of 42 hours to conceive and build (abit longer that expected).  It was made on the base of a cheap toy gun which had to be modified and was then built upon with wood, paper mache, plastic and MDF. There are further step by step photos on my props blog.  I hope you like them.

Posted by Loosewire; SOE Operative 7 years ago

Human Detector

I'm trying to come up with a small, cheap, simple circuit that will detect a human. I plan to use a grid of luxeon rebel OLEDs and whatever detector I come up with embedded in my ceiling to light up only when you are under them. I've looked into passive infrared, but it's fairly expensive for the components I could find. Any leads for circuits, ideas, or parts? I'd use parts from cheap security lights, but they tend to be around $10 each and I would probably need around12-18 ... kinda painful on the pocketbook. Thanks in advance for any help!

Posted by homba 10 years ago

Cheap and Easy Futon Frame

Hi all! I have been scouring the web for easy, simple futon frame building instructions and plans and I have not come up with anything!  If any of you would feel so inclined to try something simple that's made out of  say plywood, not slats and can be made by an amatuer woodcraftsmen, PLEASE SHARE YOUR KNOWLEDGE:)  I'm up for anything, it doesn't have to look traditional or anything, just as long as it can fold into a bed.  We need to build it for our boys to sleep on, but be able to put it up during the day. Thanks in advance!

Posted by jblhopper 8 years ago

Outdoor Halloween MP3 Motion Speaker

Does anyone know where I can find an easy DIY MP3 Motion Speaker for Halloween instruction kit? Or find a cheap loud speaker at stores?

Posted by dmurillo3 4 years ago

RF Generators

Just wanted to know if Function Generators were the same as RF Generators? I'm looking for a cheap RF for a project and when I put in "RF Generator" in eBay, it comes up with Function, Signal, and Linear Generators as well. Thanks.

Posted by FrenchCrawler 11 years ago

Making a Forge

I want to make the inlaid thingies as noted by another instructabler (lol). I need a forge that will melt the metals in this instructable: can I put together on the cheap to produce these results?

Posted by Murdok 11 years ago

Cheap DIY space savers.

So I'm in the middle of converting part of our basement into a new room to serve as my room.I'm looking for a way to make the most out of my space. My first ideas were utilizing a drawbridge style system to make a foldout table or something like that. the ceiling is entirely exposed.There are cords and beams and pipes everywhere up there.I thought perhaps some sort of drop down storage could be made. This is all I have come up with so far.I'm not too keen with drawbridges,so any help and ideas would be appreciated. the picture is me at age 15 .it shows part of the basement.Not much help. The furnace is behind the door.The door that we have sitting here for no apparent reason. Note: there is large closet already built in against the wall.That should store all the clothes I'll ever need.I'm thinking of purchasing a cheap futon for a bed,as the mattress I currently use is far too big.Does anyone know where I can find some blueprints for simple foldout tables.

Posted by Bando_Red 10 years ago

Cheap calculator hack

I put together a Solarbiotics Magbot Pendulum and it has a period of one second. I measured this by using a stopwatch and counting the swings for five minutes. . What I would like to do is count the number of times it swings back and forth over an extended period of time, for example 24 hours.   I came across an article showing how to use a cheap calculator to count the number of turns a shaft makes. A cam attached to the shaft presses the "+" key each time the shaft turns one full turn. to use it, you clear the calculator and press the "1" button. Then every turn the cam presses the "+" button and 1 is added to the sum being displayed. Every cycle of the pendulum causes the LED to flash (pulse)  once. I'd like to use these pulses to do the electronic equivalent of pressing the "+" button.  It might be possible to count these pulses using electronic circuitry (decade counters) but electronic calculators only cost about a dollar of two and I'd like to give that a try. Any suggestions would be appreciated.

Posted by dickb24 5 years ago

Cheap calculator hacking

I put together a Solarbiotics Magbot Pendulum and it has a period of one second. I measured this by using a stopwatch and counting the swings for five minutes. . What I would like to do is count the number of times it swings back and forth over an extended period of time, for example 24 hours.   I came across an article showing how to use a cheap calculator to count the number of turns a shaft makes. A cam attached to the shaft presses the "+" key each time the shaft turns one full turn. to use it, you clear the calculator and press the "1" button. Then every turn the cam presses the "+" button and 1 is added to the sum being displayed. Every cycle of the pendulum causes the LED to flash (pulse)  once. I'd like to use these pulses to do the electronic equivalent of pressing the "+" button.  It might be possible to count these pulses using electronic circuitry (decade counters) but electronic calculators only cost about a dollar of two and I'd like to give that a try. Any suggestions would be appreciated.

Posted by koyescha 5 years ago

Using Resin& makeing Mold???

I want to try and use Resin (for the first time ever). What kind of resin should I buy if I'm going to be makeing small pieces that will imitate candy. And how the hell to a make a cheap mold?? :S

Posted by ZiggyRodrigues 11 years ago

Tablet as a field monitor?

Have anyone come across a tablet that would have a HDMI input? Or a hack to make one? I mean there are lots of 10" monitors but none of them have a screen as good as a cheap tablet.

Posted by DainiusG 3 years ago

Steampunk Scooter

Oh, to have a steampunk scooter that actually shoots steam out the back as you ride. This makes me want to get a cheap old scooter and rip it apart to create something new. Linkvia BoingBoing

Posted by fungus amungus 10 years ago

parallax barrier

Does anyone know of instructions on how to produce a cheap parallax barrier for an lcd? I want to build a screen cover for my netbook that will allow me to look at 3d images and videos without glasses

Posted by drakesword 8 years ago

Cheap 3D printing company?

Hi, I would like to get a 3D print of a model I made. I've heard a lot of good things about Ponoko. I exported my file from SketchUp to a Collada file(*.dae), and then uploaded it to I selected the material, and this is what I found out: It would cost me $200 for a 3-inch cube, with the cheapest material(durable plastic)!!! Does anyone else know of somewhere where I can buy reasonably-priced 3D objects that I design(<$70 USD)? I'm not worried about shipping time, as long as i get it within a month.

Posted by metrogdor22 7 years ago

Free idea: Umbrella Sword!

I had this idea today, after the first rain of the year. It would be simple, really. Use a cheap umbrella and halloween prop sword for a cheap one, or get a really nice umbrella and a real sword handle to go like a sir. I would love to see this done, but don't have the resources at this point (starving college student). Someone make this and they get a patch or maybe a pro membership. Just cite my idea in the Instructable and let me know when it's published. If no one makes one, I will for sure later when I get the materials.

Posted by ilpug 6 years ago

LED blink based on proximity

Hi, I want a LED to start blinking if it is outside some area. Kind of a prisoner electronic bracelet :) What would be a cheap solution for this? Could I do this with 2 proximity sensors? Thank you.

Posted by PedroP46 3 years ago

ninja wepons

Hi im wondering about a few ninja weapons one is how to make a senbon i looked but i coouldn't find any guides and two how to make good cheap caltrops

Posted by master ninja 10 years ago

PCB Boards

Does anyone know where to get cheap pcb boards? Blank ones I mean, not a place to get them done for you. I don't want a MASSIVE order but if there are some manufacturing companies with free samples too, that'd be nice :)

Posted by alexgeek 9 years ago

Natural Water Resistant Glue

Hi  I'm looking for a natural, cheap water resistant glue that can be applied to plant matter Ideally soluble in hot water so it can be easily applied but insoluble in cold water. Any ideas?

Posted by Isjmarshall 4 years ago

Natural water resistant adhesive

Hi I'm looking for a natural, cheap water resistant adhesive that can be applied to plant matter Ideally soluble in hot water so it can be easily applied but insoluble in cold water. Any ideas?

Posted by Isjmarshall 4 years ago

How do IC chips work?

Do you need to prgram them, or are they standard enough to where you buy certain ones for a given project? Also where's a good place to find cheap IC chips, specifically a LM3915 ?

Posted by mrshow555 11 years ago

bb gun powerful

Hi I bought A cheap BB gun and I was wondering if it was possible to make it much more powerful that would be cool could you show me how to do it oh ya its a airsoft pistol

Posted by Monkeyfisher 11 years ago

does any one know of a house hold chemacel that will etch allumin (sorry fore the spelling errors)

I have access to cheap aluminum sheets and i was wondering is there a way to etch PCB on them?

Posted by ZBM 10 years ago


Does anyone know where I could find a really cheap (about $250 USD) gas scooter or moped? I really want one but all the ones I've seen are well over a thousand and thats just too much. thanks!

Posted by nitsuaustin 9 years ago

Tethered SD card

I would like to tether a cheap digital camera. The problem is I don't know which one - I'm watching on ebay for a madly cheap camera (I've seen loads go where they're fine except for a stuck zoom - like 6Mp cameras for about £3 - when every time I've looked at a stuck zoom a bit of twisting and brute force will get it back in to the body - and the project I want it for doesn't need to zoom!). Problem with doing this is that by the time I've found a cheap camera with 2 minutes to go, it tends to take a lot longer to that to figure out whether you can tether it. And even then you're normally limited to the provided software, I'd like to be able to write my own. So - can anyone think of a way to take an old SD card and somehow - I don't know - solder wires to the insides of the contacts maybe - and then somehow get those wires into another old SD card and plug it into the card-reader attached to a PC so that you can read the images without unplugging the "card" from the camera?

Posted by ohowson 8 years ago

Cheap Arduino Drone Project

Hi there  :)  , Right now, I am busy on a project, called "The HoboDrone" to make a cheap ass drone. It is my intention to make a DIY guide for everyone. The next problem that need to be solved right now in my project, is to process all information that comes and goes through this drone, through the Arduino. My question is if it's possible that an Arduino handles next tasks/can deliver enough CPU-power for: - Reading the sensors - Run the code to stabilize the drone - Control the electromotors (output from stabilizing code) - Get input through RC-signals and control the electomotors I did not start writing the code for stabilizing the drone, but there are plenty of examples out there, like the bluecopter: (This code doesn't deal with RC-input from a controller on the ground) I have read a similar DIY project which used a Raspberry Pi, which took care of a part of the code. ( Is it possible to only use an Arduino in a Drone, or should I work in the direction of a coöperation between an Arduino and Raspberry Pi ? Thanks in advance!

Posted by Prestigious_Hobo 2 years ago

Looking for cheap LiPo 3s low voltagle cutoof/balance circuit

Looking to add portability to a boombox project I built. Want to just grab a LiPo r/c pack and use a 3a 12v SMPS to charge it with. Know of a good battery protection circuit? This will be going to a non tech minded friend. So I'd like him to just be able to plug in the PSU when he is home without the worry of overcharging and be able to run it until the low voltage cut off is hit without worrying about killing the batteries. Any suggestions? It would be for this Thanks

Posted by Cancerkazoo 5 years ago

Google Sketchup: Fill unseen space?

I'm trying to get a cheap 3D print of a model(<$100 with S&H;). But one problem is that the walls are infinitely thin, so I need to fill the space between them. But how do I do this? The main problem is the boxes all around the surface(look at the uploaded model). They need to be filled, without the internal space where the flashdrive goes being filled. Can someone please tell me how to do this, and also a cheap 3D printing service?  Cheapest I have seen was i.materialise. The price for the model: $36. Not bad at all. The price of shipping: $144. I'm not going to spend almost $200 on a case for a flashdrive.

Posted by metrogdor22 7 years ago

Do game stores sell PS VITA games cheap?

Hey. So i decided to get a PS VITA recently. But with all the good games' prices sky high im worried that i would get a ps vita and not be able to play any good games. I dont really want to use remote play (probarbly because i dont have a ps), and i also dont want to buy games for 120 TL (turkish currency, expensive) My cousin has a regular PSP and he gets games for 15 a peice. Is there such thing for PS VITA?? Thanks in advance.

Posted by Doc Penguin 3 years ago

Experiment : Double Slit

Hi !I tried to reproduce the Double-Slit experiment with a cheap red laser-diode (<1mW).Below are various results obtained from some variations of the experiment ... (with a double slit, with a pinhole, with a thin wire, and with a hair (and also with a single slit who gave almost the same result than with a hair))I also tried to reproduce it with an other source of light (and got electrocuted). But so far, I'm not satisfied by the results I obtained with the light bulb, and I failed with the sun.Do you have some experience to share about this experiment ?Do you have successfully reproduced it with an other source of light than a cheap laser diode ?

Posted by chooseausername 11 years ago

Looking for a small LCD to use with and LED matrix

I'd like to make my own small HDR display. I'm having a little trouble googling a transparent monochrome LCD screen to overlay on an LED matrix. Anyone know a good cheap source? Here's the basic concept: the powerpoint and skip to the display section.I figure I can use this cheap LED matrix to at least get some color: know a better color LED matrix?(I'd prefer an Isometric array myself)I'm principally trying to find a transparent monochrome LCD screen to modulate the LED matrix.

Posted by royalestel 11 years ago

Cheap Under Deck Ceiling - Looking for details, anyone done this?

I'm 'fixing to get ready' to build this under my deck  to cover a 16' wide x 12' long space under my deck.  It looks simple enough, and there are a couple of YouTube videos of the same thing, but they all leave out some detail.Has anyone here done one of these? I think it needs flashing at the house end so water isn't weeping down the siding. Any other tips or tricks you found ? Thank you. ! Terry, Council Bluffs, Iowa 

Posted by Terry_Jim 3 years ago

liquid plastic supplies

I need help finding some cheap liquid plastic. It doesn't matter if I can get it online or at a store i just need to find some that isn't insanely expensive. so any help will be appreciated

Posted by General Biscuit 10 years ago

MP3 Ideas?

I just got a cheap 128MB coby MP3 Player.And i wanted to know if anyone had any good ideas,wether it be hacking it somehow or jut changing the case to somthing crazy(Really wanna do that).Here is a picture of it.So,any ideas?

Posted by Dragonpike 11 years ago

proximity sensor

 I need to build a sensor kits that will be connected on to my midi controller and replace the control knobs. I want to control track volume (on Logic audio) by moving my hand up and down. any help for cheap solutions?

Posted by nikaki 8 years ago

RAID Config with multiple flash-drives but no Flash-drive HUB

Is it possible to connect flash-drives without a hub and set them to a RAID config? Or should i stop being cheap and buy a hub and make them into a RAID set?

Posted by spiker 10 years ago

cheap evil ways manufactures scam you

Manufactures scam you all the time from smaller jars to plastic bolts please post some that you have found and post it here! if you find a solution do that too

Posted by BIGHAIRYDUDE 7 years ago


I have to make a shield to go with my 300 Halloween costume, but I'm not sure what to make it out of. I need a quick, easy and cheap way to make a shield that looks like the one in this picture:

Posted by omnikin 11 years ago

Blinky Geeky Tabletop Decoration with CMOS 74C14

I made this blinky geeky tabletop decoration based on my instructable over there: have fun and share your ideas!

Posted by mischka 8 years ago

Wine Barrel

Does anyone know anywhere i could go or look to purchase/obtain an empty (large) wine barrel, like the old fashioned looking wooden ones for cheap? i looked around but to buy a large one like 55 gallon is REALLY expensive

Posted by puno 7 years ago

Part Suggestion

I'm planning on pranking a friend by hiding a really loud buzzer in his house but I need some sort of way to be turned on after a certain amount of time (so I can get away) any suggestions? (preferably cheap ones)

Posted by Undemption 7 years ago

A Guide to Screen Printing As a Supremely Accessible Art Form

Here's a pdf of an in depth tutorial on high quality, cheap screen printing. I couldn't post it as an instructable so I was told to post it here. Check it out: (the pdf below)

Posted by humanpoweredprinter 11 years ago


What is a good place to find piezos? I know I can find them in some old computers and cheap toys with "sirens" in them. What other devices readily have piezos installed? (....and please spare me the sarcastic answers about finding them at Radioshack)

Posted by randofo 10 years ago

Potential $5 RC Hovercraft

Hey y'all, I was bored, so I made this RC hovercraft, kinda like a Tiny Whoov, from the guts of a $5 RC helicopter (sold at most FiveBelows). The idea is that a hovercraft is more fun than a cruddy helicopter, in addition to being a fun and easy DIY project for the weekend. It could be a nice gift to a kid. My first concern was that the motors would not provide enough power to get the thing moving. They give more than enough power, and this thing can MOVE. My second concern is that the differential thrust steering system (one motor turns faster than the other, steering the hovercraft) would not be effective enough. This is still a problem that I don't have the enthusiasm or time to solve anymore. Maybe someone could figure out how to reprogram the FC board to have more differential thrust (is that possible?), or somehow configure a servo or actuator without raising the cost of materials too much. Anyway, here's the concept, go have fun with it.Supplies:Foam platesHot glue$5 RC helicopter with 2 motors and receiver (LED optional, but really cool)Connector (the battery might be soldered directly to the FC board, so this will make it easier to fiddle with)Soldering iron (not %100 necessary, but it can come in handy)Propellers (see design notes)Design notes:Notice how the underside of the hull is curved and smooth. I used propellers from a Blade Inductrix FPV Pro, but any micro quad propellers should work. Notice the nice little compartment under the FC board where you can stick a battery without the need for Velcro or glue. This would be a very easy FPV mod, but that would add about $20 to the cost.

Posted by Thorondor95 8 months ago

77 Creative Projects You Can Make Yourself with SCRABBLE Tiles! -- Beyond the Scrabble Tile Pendant :)

SCRABBLE IN STYLE: 77 Fun & Fresh Scrabble Tile Projects! This Jam-Packed Full-Color PDF Guide (40+ pages!) goes WAY beyond the classic Scrabble tile pendant. (not sure what the craze is all about? Check out )In my latest, most comprehensive guide, you'll discover everything you want to know about Scrabble tile crafting, including:- 8 Basic Technique Mini-Tutorials- 13 Ways to Make Scrabble Tile Jewelry- 65 Instructional Diagrams & Photos- 4 Funky Finishes- 4 Ways to Jazz up Your Tiles- 6 Scrabble Tile Alternatives- And Much Much More!!!Check out a few preview pages below to discover just a small sample of what youll learn when you purchase this electronic tutorial.Over 300 tutorials sold in the past 2+ months... here's what a few people have been saying:........................................................................................................................................................................"What a wonderful tutorial! I've never seen any instructional ebook more professionally done than this one...Laura is wonderful to work with!"........................................................................................................................................................................"As easy as 1,2,3. The instructions are clear, step by step and help links to various websites. A+ Seller!"........................................................................................................................................................................"You rock girl! This is a fabulous deal! I was already making Scrabble tile jewelry, but it looks like this has SO much useful info. Great job! You can tell a lot of work went into this E-Book." ........................................................................................................................................................................"Lots of good information...great customer sweet it is when you purchase something the seller says if you have a problem just get in touch with them...what more can you ask for!!! prompt, friendly service."........................................................................................................................................................................ Check out the tutorials for yourself at http://thescrabblegal.etsy.comLook forward to hearing from you soon!LauraTheScrabbleGal :)

Posted by TheScrabbleGal 10 years ago

I'm melting

I recently got some thin PVC plastic for cheap.  I would like to soften it so I could shape it, but I have no idea what temperature to do it at or what to use to heat it.  I don't want to spend money.   Thanks!

Posted by elliot5445 4 years ago

How to Increase My Mac Memory Upgrade Cheaply?

Hello Everyone, I have problem with my Air book I want to extend its Memory at very Cheap Rates. Please Share Best place if you know?

Posted by outsourcingbee 4 years ago

Need outta here, anyone have a room for rent?

My moms is going BEZERK and it's driving me nuts so I was wondering if anyone in the 519 area code in ontario has any cheap-ish rooms for rent. Thanks

Posted by Punkguyta 11 years ago