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.
Topic by macoga13 | last reply
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?
Topic by frank26080115 | last reply
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)
Topic by canida | last reply
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.
Topic by davesender | last reply
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 (http://www.arduino.cc/) 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
Topic by ZrvZ | last reply
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.
Topic by gpiejai | last reply
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
Topic by durp123 | last reply
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.
Topic by wenpherd | last reply
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.
Topic by DELETED_PaulL101 | last reply
I have a friend that needs to make a duplicate of a fragile archeological artifact for further examination. He only needs the face, a single surface, measured and duplicated. I thought of a two technologies project. First a 3D measuring of the surface then a 3D printing of the results. Have we done such a project?
Question by kbs2244 | last reply
What is the most inexpensive way that I can measure capacitance? I have some photoflash capacitors that aren't marked with their capacitance. I went to radio shack, and the cheapest multimeter that measured it was around 60 dollars. Is there a cheap way that I can find out the rating of my capacitors?
Question by daa5849 | last reply
How do I measure the capacitance of something, I looked at the local ACE and none of the meters have a farad reading or anything else similar to capacitance. We have an analog one, and I was wondering if there is a way to use it I just don't know of.
Question by jj.inc | last reply
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
Topic by hassi | last reply
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.
Topic by Fat Sparrow | last reply
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?
Topic by mattilaniko | last reply
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 guess..is there something i can do with Arduino.. any ideas guys....? Thanks in advance Chuppandi
Topic by chuppandi
Hi everyone, I am stuck. I am trying to find a method or sensor to do what I want. Basically, I am trying to make a cheap flat weigh scale- light weight , flexible and portable (carried in a brief case or lap top case); thinner than using load cell sensors. I was hoping for a flat compression fabric , foam or piezo resistive pressure sensor, but have not found what I was looking for. It needs to be able to measure 50 to 250 lbs & fit on a counter. Does something like this even exist? Any suggestions would be most welcome. Thank you Appl314
Question by appl314 | last reply
How would I measure the voltage and current of this circuit with an arduino?
Question by flybye22 | last reply
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
Topic by VinitV
i want to measure the frequency of this flasher circuit but i always get a frequency close to that of the mains. I am using a wall wart. i changed some of the components to speed up the flashing but the frequency reading stayed the same. to check my multimeter i tried measuring the frequency of mains and the joule thief circuit and it looks like my multimeter is good. how should i measure the frequency in this flasher circuit?
Question by codestroy7 | last reply
I will be doing an experiment how powerful the magnetic field of an electromagnet, and my guess is the more you twist the wire the more power it generate. But i don't know how to measure the magnetic field by using the unit Tesla.
Question by defineSCIENCE | last reply
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?
Topic by Sedgewick17 | last reply
Actually i want to know whether there is a device which can measure the rain fall (not actually before hand but atleast in few minutes after the rain starts)which can be otherwise be substituted by a sensor which generates a message when it detects rain..........
Question by kadkab.abdul | last reply
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!
Topic by Juan FelipeT | last reply
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
Topic by AnnaL3 | last reply
My power supply says it can supply 12 Volts @ 10 amps. It used to power 2 linear actuators drawing max 4.6 amps each, but no longer does. It still supplies 12V measured by multimeter. Is there an easy way to figure out how many amps it now supplies?
Question by thisisted | last reply
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?
Topic by rednax718 | last reply
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.
Topic by ChinmayV2
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?
Topic by astrozombies138
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. ?
Topic by Kiteman | last reply
G'day All, If this has been done before, I apologise, but I have not found anything when I have searched. I am a team manager for a team of students who need to design, construct a three wheeled vehicle. The test is a 24 hour "trial" (more like a race ;-) ) We have been competing in a category for "Hybrid Vehicles" which an additional power source to asssist the rider. In our case it is a 50cc engine using a friction drive arrangement so we can disengage it if required or if we desire. The reason for this is that we only recieve 3 litres of petrol for the event............ This is my problem. I have not been able to measure petrol in the tank accurately enough. Over the last two years I have had one litre left or ran out after 21 hours. I have been thinking of using a strain gauge or load cell to measure the weight of the tank. I'm thinking it could be as simple as powering up the load cell with the appropriate voltage, and measuring voltage drop across it, maybe with an added resistor. Or it could be made more complex by using a circuit to drive a number of LED's giving an indication of the fuel in the tank. If anyone outhere has any ideas to do this simply and reliably, I would love to hear from you. If it is more complex then so be it. Here is a link to the event to give you an idea of what it is about http://racvenergybreakthrough.net
Topic by coln72 | last reply
There is a serial Bluetooth module that I have used before on an Arduino project but now I'm trying to use in a project without the Arduino. Basically I need it to be an electronic trigger, I don't care really what the signal is just how long and the voltage and current. There are 4 pins on the module: Vcc, GND, Tx, and Rx. There are 2 open pads: Key and State. When I send a command from my phone the module sends a signal out the Tx pin, and it is this signal I would like to measure so I can pick a command with an appropriate signal and tailor the rest of the circuit accordingly. I tried a voltmeter between Tx and GND but saw no signal on any level measuring DC. Is there something I'm missing? Is the signal more complex or different, or is that test setup flawed? I tried other combinations, Rx-GND, Tx-Rx, RX-Tx, GND-Tx, GND-Rx but saw nothing.
Question by bwrussell | last reply
I am going to use a ATTiny43U to obtain the voltage of a 2vdc solar battery, via self powering (0.8-5.5VDC). Using ohms law I know I can obtain the amps as I will have the voltage and a resistor. I want to know what resistor to use? I will feed the amps result back into the ATTiny43U as well as the temperature from another sensor. Can someone please advise me what tiny circuit I can use to get the amps as I do not know what size resistor to use? The operating voltage should be between 1.55 and 2.67 vdc give or take a bit. Thanks and kind regards, jB
Question by britesc | last reply
I need to measure the shaft power output of a small motor. How to do that? Most machine on the market are to measure large shaf power output, such as of a car or motorcycle engine. My power output is estimated to be about 2kW. Any suggestion would be of help to me. Thank you. Regards, Wan
Question by wanzaidi | last reply
How to develope a measurement distance device using Programmable Interface Controller (PIC)? I don't how to start my project... i also do known how to write the programming for this project..and how to build my circuit... my IC is 16F628A. LCD is 16x1... please if anybody known PIC, help me!!! ( i _ i )
Question by waiteng | last reply
Hi there, I am trying to keep my hardware/ coding skills alive and spruce up my bicycle wheel truing stand. I need to figure out the required hardware + software for the following: I want to build a non-contact distance measurement sensor system and get the output "into" my computer for display in a graphical user interface. I know I could omit the latter step with going directly onto a mini-LCD screen, but trying to use this a learn-another-programming-language learning experience (I've coded Matlab galore, pondering Python for this project). General system components: Sensor - [something - RasPi or Arduino I guess] - laptop (running debian) - GUI displaying continuous sensor reading Sensor: I've web-searched the hell out of this, but not finding anything quite answering my questions. I want to continuously measure the distance from the sensor to a bicycle wheel rim braking surface. Material is aluminium, shiny, though not smooth. Biggest problem with the web-search is being swamped by proximity sensor results (on/off) rather than a distance proportional output signal and much lower resolution projects. I rule out IR or optical sensing, now stuck between ultrasonic and inductive sensing, though tending to the latter for a faster response/adjustment to change time. Sensor criteria (other than reasonable $$): - total sensing range: ca.5mm - sensing accuracy 10 to 100micron/ 0.01 to 0.1mm - don't ask if that's needed, a bit of overkill, I know, but a bit of OCD doesn't do any harm, eh? - fast-ish sampling rate (so that when I turn the wheel, the number on the screen updates nice and fast, guess >25Hz is sufficient). [Something - RasPi or Arduino]: I know that I could omit the laptop GUI part (mini-LCD, LED array, etc), but keen to learn/ practice a little Python with this project, so I guess I am tending to the RasPi, but I am open minded. All I want is the analogue sensor out to end up as a digital reading "inside" my computer to be passed to my GUI as a reading. Essentially a mini A2D converter. Not fussed whether the output is in actual distance units or in arbitrary units/ current units (I guess the sensors put out a proportional current signal?). GUI: Depending on the above, how do I best get the signal "into" a Python program? A moderate fast sample rate >25Hz should suffice. Any help with this would be greatly appreciated!
Question by lasercycle | last reply
I desire a device to measure a weight up to 5000kg. I don't know if this is termed a strain gauge or a pressure plate. my requirement is that the pressure plate itself be at least as small as a washer for a 10mm bolt. I need the device to record the maximum force, as the force is variable over time.
Question by Phil11 | last reply
The below weblink will take you to a blue tooth measurement device that is already on the market. I am looking at expanding into an area that MFGs do not want to go. This is measuring in the machine tool. I am trying to get a better understanding on the components needed to get started on this adventure. Thank you for your help in advance! http://www.marposs.com/product.php/eng/wireless_bore_gauge
Question by Tommyt39 | last reply