Measuring Volume

So im doing a science fair project for my school and i decided to be different from all the projects. im connecting a 2 channel amp to some old speakers and i was wondering how to measure volume or loudness coming from the speakers when i increase the watts of the amp. my teacher told me theres a specific unit for this and and specific way to measure volume. but so far i cant find much. so i ask you guys for help. please and thanks.

Posted by gpiejai 10 years ago

Follow the bouncing ball!

An article in PhysicsWorld reports on a novel technique for measuring the acceleration due to gravity. The researches used a cloud of ultra-cold atoms and bounced them off a series of upward laser pulses. By measuring the timing of the bounces they could measure g with better than 1 per mil precision.

Posted by kelseymh 9 years ago

Slope Measuring

     I'm interested in making a yardage book for one of the golf courses i play at. The only problem is that i don't know an accurate way to measure the change in distance through elevation. For instance if a shot to a green with no change in elevation requires a 7-iron, then a shot of the same distance that is downhill should require a club that will hit the ball a shorter distance.       My question is, is there a formula of some type that i can enter the rate of change in slope and the distance, and get the actual distance needed for the shot.

Posted by wenpherd 7 years ago

How do I take a contour off my balcony railing and transfer it to a piece of wood?

I have a planter designed to fit over a piece of 2x4 railing, and a railing on my balcony that is smaller than 2x4, and curved, with a non-rectangular side profile. Please see the photos. I have annotated the first three photos. It's hard to see from the photo of the railing, so I drew a side profile of the railing shape and photographed my drawing. The planter has a groove in the bottom so that it'll rest securely on the 2x4. I want to make an adapter out of wood so that the planter will rest securely over my railing. I plan to cut some wood to fit perpendicular to and against the railing, countoured to fit over the railing, and seat a piece of wood over the top of the railing, running parallel to it, to seat the planter into.

Posted by Mr_Liss 4 years ago

Measure triangle wave with DC ammeter

If I measure a positive only triangle wave with an analog DC ammeter will it give me a relatively accurate current measurement?

Posted by kenw232 4 years ago

Is there a way to measure for methanol in your final product

Is there a way to measure for methanol in your final product?

Posted by Tjmcwi 1 year ago

Measurement Equivalents

Check out this awesome measuring cup!It's carefully marked to provide all sorts of useful measurements and volumetric equivalents, such as "enough red wine to take you over the driving limit" and "as many grains of flour as people on the planet" and "tyrannosaurus rex brain". So cool.(via boingboing)

Posted by canida 10 years ago

measuring loudness

I want to experiment measuring sound volume using a A2D converter and a microcontroller, but it is not as simple as i thought because i can't just measure once and use that spike should measure for a period of time and add up all of the amplitudes? or average it all out and use the difference from the average to 0?

Posted by frank26080115 11 years ago

Laser Height Gauge

Hello, I wanted to know if there was a way to build a laser height (measurement) gauge that can measure to .001 or .0001?

Posted by vash399 9 months ago

voltage measurements

I need to make several voltage measurements simultaneously.  I am looking to troubleshoot a intermittent problem with my truck. Has anyone any experience with this challenge ?   I would like to be able to store these measurements to be analyzed at a later time. Thanks, Dave Sender.  

Posted by davesender 3 years ago

how do you measure HV?

What's the best way to measure High voltage (I think my output is somewhere between 10kv and 50 kv)? Is there a formula for the spark length and humidity (I can measure humidity)? I need to buy an appropriate capacitor for my tesla coil, my initial HV is from an ignition coil.

Posted by guyfrom7up 10 years ago

Measuring Current of 24v dc motor

How to measure the max current of 24v dc motor.. please give me step by step guidance. many thanks

Posted by epple 6 years ago

Measure Punch Force tool

Hi All, I do understand we all keep creating new electrnoic tools/gadgets everday. But anyone had tried to create a tool which can measure force / intensity of human punch. It is fun to measure your punch force among friends. also if help us to improve your boxing strength. Please share your thoughts on it. Thanks

Posted by VinitV 1 year ago


I just took the concrete clases and didn´t see measurements for diferent jobs like: mortar for bricks, cement for walkway, in the form of 1 part cement, 3 part sand, 3 part gravel.

Posted by macoga13 8 months ago

Measuring audio

I have a project where I need to be able to measure 3 or 4 microphones and decide which one is getting in the loudest input volume. In other words to know who is talking around a four persons table. Does anyone have any idea how to solve this problem? I'm using arduino ( for the rest of the project so I'm able to use the arduino to measure dc voltage but how do I transfer the sound wave into a measurable dc voltage? thx in advance / david

Posted by ZrvZ 12 years ago

Sensor for measuring time a subject

I would like to have a thin sensor that can measure the wearing time of a hand brace of a patient? Any suggestions? Some people call it compliance sensor and using temperature during time. Thank you

Posted by orthofoo 5 years ago

Vertical Measurement

These vertical measurement things ( cost upward of $350!!! Is there any way this can be made on the cheap. All help would be very appreciated. 

Posted by adamgadamg 5 years ago

How to measure Velocity/Acceleration of bicycle

I want to measure velocity or acceleration of a moving body(E.g: Car,bicycle,etc) without using a GPS module. Is it possible to calculate coordinate acceleration or velocity using an IMU.

Posted by Jonathanrjpereira 2 years ago

How to Measure From a Picture

I am trying to make a table from a picture in a magazine, which has some intricate lathe work that I want to duplicate. The problem is the picture was taken at an unknown angle, and when I try to scale up from the picture my measurements come out screwed up. Is there something I can do that we allow me to find the right measurements?

Posted by Sedgewick17 10 years ago

measuring my cat's activity

Hi guys, I'm trying to create a little gadget to measure my cat's activity throughout the day by measuring its steps and sleep. I can attach a regular fitness band around its neck but I've got no clue as to the algorithm to go along with it since cats obviously don't move the same way our wrist or arm would. Any ideas? Thanks for the help!

Posted by Juan FelipeT 2 years ago

Measuring an explosion

While this may not be the best instructable I believe it would be helpful for many people doing science fairs (ie: ME). So here is the question said instructable would answer: How do you measure the force of an explosion, specifically of gases or liquids used in fuels? I have been racking my brain on this but everything i have come up with seems like it would be inaccurate. Thanks for any help

Posted by durp123 9 years ago

create "black body" and measure radiation

Hi i have been looking for some experiment about black body radiation how can i make a black body at home and how can i measure the black body radiation using inexpensive materials... i would like to measure plank's constant and so... i didn't find anything on the net any suggestions? thank you!

Posted by yitzik25 1 year ago

Can I use a multimeter for measure voltage drop in LEDs?

I have a really cheap multimeter, but it has a "diode" position in the main switch. As the LEDs are diodes, could I measure the voltage drop for use in resistor calculations? My guess is "yes", but I'am very new to electronics... Thanks a lot.

Posted by Limadito 12 years ago

Measuring the piezo transducer with oscilloscope

Hi, I am conecting a piezo disc as a microphone to pick up vibrations. .The problemm is when I measure the signal with osciloscope I am getting a messy and modified one with many noise  If I am measuring it with PC oscilloscope (threw the sound card mic input) I am gatting a clean desirable signal What is the true signal and what I am doing bad with the oscilloscope. Thanks! Anna

Posted by AnnaL3 3 years ago

Help me guys! I need to measure a motors lift weight(for a flying machine)!

So, I'm making a hover bike. Yea, dont judge me. And i have to measure the motor(s) needed to lift my bike. I have measured that my bike will weight about 75kg with me without the motors. So i need motor that can lift 75kg+(motors weight) at a power consumption of (something). Help please? :D

Posted by ТерентийМ 2 years ago

Need someone to set up a system that measuring the time of wearing a brace using a sensor and pay for this

I would like someone to construct or set up a system  that measures the time that someone is wearing a brace. Usually they use temperature or  resistance sensor using a data logger. Please if someone can build this I could pay him.thank you

Posted by orthofoo 5 years ago

How to measure the distance using laser

Hi everyone, so I would like to measure distance up to 12m using Laser ..the question is how to do so ? I want to make a simple sensor that can do the job.I know that for that i would need a reflector and the basic D=V*tso the problem is how to get the "t" !?

Posted by AbdChahidS 3 months ago

Measuring oscillation of a multi tool

I have a harbor freight oscillating multitool that is advertised as oscillating between 10k and 20k oscillations per minute. In reality to speed control goes from 0 opm to an unknown value. I’m trying to set the tool to oscillate at 35 Hz. What is the best way to measure the frequency of the tool and set it to 35 Hz?

Posted by rednax718 8 months ago

Measuring LED Voltage

Greetings... I have quite a few "salvaged" LED's, none of which have I the slightest clue as to their voltage. I have attempted to measure them using the diode setting on my voltmeter with dubious/mixed/questionable results. Although the measurements are momentary (the reading is barely of sufficient length to note), I can usually arrive at a value. Unfortunately, when I repeat the measurement on the same LED the reading is invariably different. For example, I just measured the value of a random LED (green) and came up with the following: 1.3. 1.4, 1.8, 1.6. I've rounded the values to the nearest decimal point. Are these values through voltage? Are the differences between the readings significant or should I use the minimum when calculating resistor values? I'll, no doubt, have a few more question later on. I appreciate your elucidation on this matter... Best to all, hassi

Posted by hassi 10 years ago

Not Belt

What are some ways items that would normally be kept on a belt could be kept somewhere more convienient and fashionable? Multi tool, tape measure, phone, whatever else is kept on belts. . .

Posted by 8bit 9 years ago

Test gun measurments on computer before building

I trying to find a program that was posted on an instructable that lets u input the measurements of the gun your trying to build and it tells u how effective it would be. I used to have it on my computer but lost it when I formated my computer. If you know what I'm talking about please post a link to the program.

Posted by ps3_soldier 10 years ago

Looking for someone to help buld an Arduino linear measurement project.

I'm looking for someone to help me build an Arduino linear measurement project. I need to measure less than 6" stroke with some accurate repeatability. I'm willing to pay for the programming and any parts I might need. Email me if you are interested in working on this with any questions you have... Thanks, 

Posted by rpmlou 1 year ago

water conductivity meter

Hi does any one know how to build a water conductivity meter which measures in Microsiemens. as an added bonus i would like it to be able to measure other features of water quality such as the Ph value

Posted by tawcnysc 10 years ago

DIY Storable Tubular Extendable Member (Tape Measure Style Extendable Robot Arm)

Hello, I am on an FTC robotics team, and often robots are required to lift/reach objects. This year, a challenge was to reach up and grab onto a pullup bar; the robot then completed a pullup. One common method this year was to use a tape measure; the tape measure was unwound using a motor, remained rigid due to standout, and was then wound up, lifting the robot in the process.  I am now in the offseason and I want to improve on this design. I found that a very similar mechanism to the tape measure has been used for extendable antennas on spacecraft. I would like to create a similar mechanism. The main difference between the tape measure and the STEM mechanism is that the STEM extends a tube. The tube is rolled from a sprung piece of metal. The piece that I am looking for is a material that could be flattened, but would retain its tubular shape like on the STEM. Does anyone know of any types of pipe or tubing that could be cut lengthwise and possess this springy characteristic? Is there anyway to create a material like this? Thanks, icecats

Posted by icecats 2 years ago

Gap measurement using a sensor

I want to measure a very tiny gap of about 20-30 microns(0.02-0.03 mm) using a sensor with the help of arduino and then display it using a 16x2 Digital LCD Display. Can someone help me out with the sensor that I will need for this purpose with exact name and its working.The gap that I want to measure is the gap between the the joints of a healing fractured bone.(the joint where the tissues develop to join the broken parts together.)Since this is a leg bone any person walking with such a fractured bone will put pressure on the bone and the gap present in the bone will reduce. So that is what I want to measure using a sensor and arduino. Since this gap will be too small (20-30 microns) I am unable to find a suitable sensor for the same.PS: Main issue I am facing is the measurement of gap using a sensor and arduino since I can find a suitable sensor for the same.Please find the attachments of the bone and the gap I want to measure.Also the thing I am doing is a close case of greenstick fracture. refer to the attachment of greenstick fracture.

Posted by ChinmayV2 5 months ago

Ultrasonic distance measure

Hi eveyone, I'm an assistant cameraman in film and tv and sometimes I've hired in a  professional distance measure device to help with really tricky shots. Trouble is, to buy one costs an arm and a leg, I was just wondering if anyone here had come up with an affordable version. The device sits on top of the camera and sends out ultrasonic pulses to where ever it's pointing and displays the distance in feet and inches on a LED display, that constantly updates. That's all it needs to do. Should have a range of 2' to 15' and be +/- 1" accuracy. Any help would be greatly appreciated.

Posted by Fat Sparrow 6 years ago

Metric Measurements

I love Instructables, but I find that I use it less and less lately. The main reason is the need to go through all the instructions and convert all the measurements from the old British system to the metric system that everyone else in the world uses. I do have a plugin for my browser, but it doesn't work on my tablet or phone, which I use more often when building stuff. It's 2017. Literally 95% of the worlds's population uses the metric system, and we have computers. Is it not possible for you guys to knock up a little programming routine that converts all the measurements if I'm in a metric country? I understand this is an American site aimed at an American audience, but it seems you're cutting off a huge number of potential site users here.

Posted by DELETED_PaulL101 1 year ago

How to measure distance with a contact microphone?

Hey, I`m trying to create a project about echolocation, so, I´m gonna use contact microphones, give me some ideas mates. PLEASE

Posted by JoséG100 2 years ago

Current measurement with arduino

Hey I try to measure current with hall-sensor amploc 25A, it sense magnetic-fields, offset voltage is 2.5V and I use arduino uno. I get 519 value from analog pin and 37mV/A is hall sensor sensitivity. My formula is outputValue = ((((sensorValue*5000.0)/1023.0)-2500)/37 multimeter shows 0.112amps when I put load but I dont gett correct value on LCD Is my formula OK?

Posted by mattilaniko 3 years ago

OEM Power Supply

I have an unregulated power supply, with a bridge rectifier. I suspect that the rectifier is damaged. I measured the components and the voltage on the rectifier, every connection past that measures 0 volts. Shall I replace the 4 diodes?

Posted by knektek 8 years ago

If anyone owns the iPod Classic....

Could you measure the click wheel? I'm working on a project that involves it, and want my proportions to be correct. The measurement can be in any format (inches, millimeters); I'll just convert it over to inches anyway. Thanks!

Posted by Bran 10 years ago

How to Identify or Measure Inductance?

I am gathering the parts for an ible, but I am short one part: a 12mH inductor.I can spot some inductors in electronic garbage - the wire coiled around a ferrite loop - but there are also solid state inductors. Plus, the inductors are not usually labelled with their values.How can I measure the inductance of an inductor with a volt-meter and an ammeter, but without access to a sine-wave generator?Is there some simple trick that would get me "close enough" to the true value? What would be really useful (but probably doesn't exist) is a chart or formula where you plug in the size of the core and the number of turns around it and out pops the inductance value. ?

Posted by Kiteman 10 years ago

Can I measure everything?

Can something exist if has no mass or cannot be converted into mass? The mass of a photon is zero, yet how can a photon have energy but not have mass? If this is false, would that it be true that a box with and LED in it would have more mass when the LED is lit? But, are there other types of being aside from energy and mass? A concept perhaps. How would a concept be measured? The word apple is comprised of certain wavelengths that are detected by the human ear. In the human body as a system, the energy that my body requires to produce those wavelengths at "regular" amplitude (assuming there can be a standard amplitude) could be converted into mass. Would this allow me to measure the mass of the word apple in the system of my body? Right now I'm sure many of you are thinking that the word apple could be represented in many other ways such as writing. This is why I used the word 'system' when I referred to myself saying the word apple. Since there is no standard for the writing and speech of the word apple. Is everything comprised of something? Could that something be converted into mass? Can I measure anything?

Posted by astrozombies138 10 years ago

Flute measures

I would like to make flute. Pvc is out of question.  I was thinking to make it out of copper. My only problem is lenght of pipe for right root note. Is some flute maker write it down? I think inside diameter is also important.

Posted by DeathSuperMario 4 years ago

Envelope making

Help!! I need measurements to make an odd sized envelope using the Martha Stewart scoring board. So I need the top and bottom of the envelope to be 5.25" and the sides to be 5". What size paper should I start with (I’m assuming not a perfect square since the needed measurements are not the same), and what measurements should my A and B score lines be? Thank you for your quick reply because I must get these invitations out in a few days and I am not even finished with them yet!

Posted by DebbieT31 2 years ago

Sensor to eventually measure weight ( up to 250 lbs)

Hi everyone, I am stuck trying to find a method or sensor to do what I want. Basically, I am trying to make a cheap flat weight scale- light weight and portable; thinner than using load cell sensors. I was hoping for a flat compression fabric or piezo resistive pressure sensor, but have not found what I was looking for. Does something like this exist?

Posted by appl314 7 years ago

Breathalyzer Hygrometer

I need to measure the amount of moisture in my breath, basically a digital hygrometer that I can blow like a breathalyzer.. Possible? I have built a device that removes all the  moisture from my breath, and I need a way to accurately measure moisture to make sure it works as I claim..

Posted by 3DPiper 6 years ago

Building a sensor chronograph to measure speed of batted ball

I need a sensor chronograph designed to measure the speed of a batted baseball. It would consist of a frame assembly mounted on a pole in front of home plate in a batting cage. The goal would be for the device to be stationary, able to measure the speed of a batted ball on demand and then displaying it on an LCD positioned 30-60 feet away. It should be automatic and unattended, working without anyone doing anything to activate it other than hitting an oncoming pitch. We are interested in measuring only the batted ball, not the pitched ball from the pitcher or the swing speed of the bat. The measuring area would need to be about 2-6 feet high (depending on how far in front of home plate it is positioned) to accommodate a batted ball that is hit high or low. It should be able to measure the speed of any ball hit fair, from the first base line to the third base line.  The speed of the batted ball would range anywhere from 40 to 130 mph. Since the device would be used on a repetitive, long term basis care would need to be taken during the design to provide for protection from any batted balls that might find their way into the device itself (a piece of screen, chain link or plexiglass installed in front of it?) If you know where I might obtain a working apparatus or might locate someone willing to build one I would appreciate your response to the email address below. Jerry Heath

Posted by jerryeheath 7 years ago

My New Clamp Fluke meter arrived today...

The meter showed up today from UPS. It has a wireless display (attached or detached) ,  1K A ac/dc current measurement at the jaw, current probes which measure to 2.5 k A Here are some pictures.

Posted by Goodhart 7 years ago

High Current measurement

I need to measure Current from a welding machine to make a alarm if it goes down below some level for ensuring better quality of welding. The current normally set is of the order of 200A max with around 100V DC.Not sure if i could use some clamp-on meters and pass those values out to Arduino for switching circuit. Shunt resistors may be a better option. But to make a signal conditioner to convert the ma output will be a problem i there something i can do with Arduino.. any ideas guys....? Thanks in advance Chuppandi

Posted by chuppandi 6 years ago