### flow meter?

How to construct a flow meter to measure the flow of water(or any fluid) at home? what materials and construction steps are required??

Question by aqsa mustufa 4 years ago  |  last reply 4 years ago

### vu meter?

I have just been volunteered to run the sound board in our church which is small.I had never seen one before,but as I keep working with it,I noticed that only one side of the vu meter lights up,and the lights move up and down as the volume goes up and down,but the other side does nothing.Any help. It looks like the one in step one.

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

### vu meter?

The soundboard I am learning to run is similar to the one in Learning to run a Mixer(Soundboard). It is the one in step #2.The thing I was wondering about was why the lights only light up on one side of the vu meter.Thanks

Question by jimmywilkins 10 years ago

### water meter?

Hello everyone, I have the water meter (it's just having piston and analog meter). I want to connect this meter to msp430g2553 chip. In this the output of the water meter should be A(low)  A(low)B(low) B(low), i.e. when one input is connected to chip the output will be 2 pulse. I am doing code in IAR embedded workbench. can anyone help me with the code. #include void main( void) {     P1DIR = 0XFF;P1OUT = 0X00;                      // Clear port 1     P2DIR = 0XFF;P2OUT = 0X00;                      // Clear port 2     P3DIR = 0XFF;P3OUT = 0X00;                      // Clear port 3       WDTCTL = WDTPW + WDTHOLD;                                            // Stop watchdog timer                               if (CALBC1_1MHZ == 0xFF || CALDCO_1MHZ == 0xFF)                                       {      while(1);                                                                                         // If calibration constants erased   }   DCOCTL = CALDCO_16MHZ;                                                      // Set MCU to run at approximately 16 Mhz   BCSCTL1 = CALBC1_16MHZ; /*****Initialize Port 1 & 2******/   P1DIR = 0x01;                                                                                   // Set P1.1 input (C)   P1SEL = 0x01;                                                                                  // Set as I/O port   P1SEL2 &=~ 0x01;   P1SEL &= ~0x10;   P1SEL2 &= ~0x10;   P1DIR |= 0x10;                                                                                  // Set P1.4 output   P1OUT |= 0x10; /************flash********/ void write_SegC (char value) {   char *Flash_ptr;                                 // Flash pointer   unsigned int i;   Flash_ptr = (char *) 0x1040;                     // Initialize Flash pointer   FCTL1 = FWKEY + ERASE;                           // Set Erase bit   FCTL3 = FWKEY;                                   // Clear Lock bit   *Flash_ptr = 0;                                  // Dummy write to erase Flash segment   FCTL1 = FWKEY + WRT;                             // Set WRT bit for write operation   for (i=0; i<64; i++)   {     *Flash_ptr++ = value;                          // Write value to flash   }   FCTL1 = FWKEY;                                   // Clear WRT bit   FCTL3 = FWKEY + LOCK;                            // Set LOCK bit } /********prog******//////// int i; while(1) {   e=getdata() i have written till here. suggest me how i will take the data from meter and i will produce the 2 pulse at the output? thank you

Question by Dushyant KumarS 2 years ago  |  last reply 2 years ago

### Sound level meter?

Does anyone know how I can build a simple sound level meter with a light that will come on at a certain sound level?

Question by pennsteve 7 years ago  |  last reply 3 years ago

### Wireless Weather Meters

I recently completed my wireless weather meters project and thought you guys might be interested in it. It uses and Arduino, analog panel meters and XBee to be able to wirelessly display weather forecast information in any room in the house. Check it out at http://electronics.guy-smiley.com . Schematics and source included.

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

### VU Meter help

I'm trying to build a VU meter and am having trouble finding a schematic that actually works.  I having tried using the LM3915 and LM3916 both seem to act the same way.  I've tried 5v 9v and 12v sources along with every schematic I can find with no luck.  Either all the lights flicker a very fast. These are the schematics I have tried: https://www.instructables.com/files/deriv/F02/VELA/FJ3N5V3Q/F02VELAFJ3N5V3Q.MEDIUM.gif https://www.instructables.com/id/LED-VU-meter-that-dances-to-computer-music/?&sort;=ACTIVE&limit;=40 https://www.instructables.com/files/orig/FX5/67GS/FLROK12R/FX567GSFLROK12R.gif Nothing seems to work.  I have added two 1uf caps across the source and a variety of resistor combinations but always end up with nothing or flickering lights.  What have I done wrong?

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

### VU Meter Help?

I can only find an LM324 for a U meter. and the only schematic i could find was confusing....http://www.google.com/imgres?imgurl=http://www.zen22142.zen.co.uk/Circuits/Audio/Vumeter.gif&imgrefurl=http://www.acidmods.com/forum/index.php%3Ftopic%3D35382.0&usg=__JKJHEVkfZz92hhYo8rDxJaU9Roc=&h=401&w=407&sz=10&hl=en&start=0&zoom=1&tbnid=BowIq_ZQanGTBM:&tbnh=134&tbnw=138&prev=/images%3Fq%3Dlm324%2Bvu%2Bmeter%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1440%26bih%3D807%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=124&vpy=167&dur=818&hovh=223&hovw=226&tx=139&ty=123&ei=mrB9TLTbDYSClAffhOjrCw&oei=mrB9TLTbDYSClAffhOjrCw&esq=1&page=1&ndsp=28&ved=1t:429,r:0,s:0.....<br> So if someone could either explain that circuit or help me with a new one, I'd much appreciate it!<br> <br> THANKS!

Question by fretwreckef94 8 years ago  |  last reply 8 years ago

### Digital Capacitance Meter? Answered

Can a digital capacitance meter measure the capacitance of an inductor?

Question by The MadScientist 8 years ago  |  last reply 8 years ago

### Multimeter Capacitance Meter? Answered

Can a multimeter with a capacitance meter measure capacitance of a home made high voltage capacitor?

Question by The MadScientist 8 years ago  |  last reply 8 years ago

### Build a Glucose Meter

Hello I am trying to build a glucose meter but have no idea where to start. I will use an arduino mega 1280. Does anyone know where I can find instructions to build a glucose meter ? So far I have been able to get a very high level idea from : http://www.eetimes.com/design/test-and-measurement/4204495/Blood-Glucose-Meter-Design. Any information, even if its just information on how to achieve a particular module from the design listed above will greatly be appreciated ! Thanks !

Topic by urzur 6 years ago  |  last reply 6 years 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

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

### Help on VU meter?

Well I want to make a stereo Vu meter for my computer. https://www.instructables.com/id/SOCKO0TFI36FRXJ/ I want it to be stereo but dont know how to do that. Im planning to cut a headphone to get the audio jack and thats stereo so how will that go into the scematic. (excuse the spelling its late)

Question by sunny342 9 years ago

### Vu meter input? Answered

Well I want to make a stereo Vu meter for my computer. https://www.instructables.com/id/SOCKO0TFI36FRXJ/ I want it to be stereo but dont know how to do that. Im planning to cut a headphone to get the audio jack and thats stereo so how will that go into the scematic. (excuse the spelling its late)And does anyone know if i can find the ic at radio shack

Question by sunny342 9 years ago  |  last reply 9 years ago

### Multimeter inductance meter? Answered

I am building a Tesla coil with a fairly poor primary coil. The primary coil is a conical 12.5mH (theoretically) but when I measured it with my multimeter the inductance kept jumping and was only doing so within the range of .05mH - 2mH why is this can it not measure conical coils?

Question by The MadScientist 8 years ago  |  last reply 8 years ago

### Engine Hour Meter

Hi, I'm trying to bodge up an engine hour meter for my motorbike (single cylinder) and I'm hoping to find a circuit diagram somewhere. I know you can buy these ready to go but apart from the fact that I have several motorbikes and they are about \$NZ90 each, well it just isn't the point, is it? Why spend money when for the sake of a few hours cursing at dodgy connections and burning myself with asoldering iron I can play creator!! Any info would be appreciated, thanks. Nick

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

### What different frequency meter and counter? Answered

Dear all.. Please help me to know : what is difference frequency meter  and  counter between 2 devices  (please see photo) Thank you so much.

Question by lam 3 years ago  |  last reply 3 years ago

### I want to make a power factor meter using arduino which can also show Real,Apparent and reactive power.

I want to make a power factor meter using arduino which can also show Real,Apparent and reactive power.

Topic by KaroonjharN 3 years ago

### Christmas Spirit -O-Meter (Bah humbug meter)

I'm a school teacher and every year we have a door decorating competition...and we always lose.  Last year, I tried working on an interactive door display that shows the users holiday/Christmas spirit level, ranging from jolly to bah humbug.  My idea was the user would put one or both hands on a metal plate(s) and lights would show up showing their level of holiday spirit.  Essentially, it's a skin conductivity meter that uses a row of led lights indicating the amount of resistance/conductivity. Does anyone have plans available or can direct me to a site where I can find them.  Preferably nothing too elaborate where I can just use a breadboard and electronic parts from Radio Shack. Thanks, Dwight

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

### how to make a current meter with microcontrollel PIC 16f877?

I want to make a current meter with microcontroller and LCD 16x2 as display. what components do i need? and what is CT?

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

### How to get a bandwidth meter that caclulates accurate bandwidth usage?

I recently got a cable modem and took a limited 2 month plan. The bandwidth is limited so I tried to install two bandwidth meters - the free NetVue and another one called DU Meter which I had used long ago.But the problem is that even when I am not doing any downloading or even browsing, both these meters show that I'm downloading at 5 - 7 kBps, constantly. This way, they show a much higher value than the actual bandwidth usage. I wish to know my daily and  weekly usage, but I cannot know using these two.Can anyone tell me what is the problem with these meters or if I need any other kind of meter for use with cable modem? Very appreciated, if anyone can help. Regards, RS?

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

### Question : Can you build a cheap Moisture meter for grain

Hello I'm a Peace Corps volunteer working with coffee. I'm helping farmers improve the quality of their coffee. To do this they need to dry their coffee very well. It is hard to tell if the coffee is dried enough without a moisture meter, and a moisture is very expensive. Does anyone know of how to build a moisture meter? this tells what percentage of the weight of the coffee bean is water, I believe. Or if anyone knows where to get one inexpensively, that would also help. Many thanks

Topic by eddieobrien 11 years ago  |  last reply 9 years ago

### Trying to locate

I am looking for a Center zeroed meter (just the analog gauge, not a complete meter), or at least an idea on what I might find one....so that my dumpster diving become more precise :-) like the one contained herein:

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

### can the IC in this circuit be replace with the normal Quad 2 input Nand gate

I want  to make a inductance meter circuit but i cant access the I.C in the schematic because the electronics store near me that sells NTE parts, dont have it. I was wondering how much different will the circuit operate if i use a quad 2 input nand gate.  www.armory.com/~rstevew/Public/TestEquip/IndMeterAdapter.htm

Question by josh1001 9 years ago  |  last reply 9 years ago

### Printing scale for repurposed meter

I am doing a project to repurpose a Westinghouse KX-241 switchboard meter as a CPU process meter for my PC.  To to this I will have to make a new scale for the meter.  Here is the type of meter in question: http://www.allsbrookelectric.com/media/0e/a20792a12cc1c0e3dc7d2f_m.JPG The scale on the meter I have does not match the scale I need, which is 0 to 100 (percent).  This is a simple task: Just remove the scale from the meter, scan it, and modify the image as necessary with Corel Draw.  Then print the new scale on glossy paper and adhere it to the top of the meter scale.  Simple.  Except, if you notice in the picture, the scale of the meter is not all flat.  The outer edge of the scale where the lines are is angled outward.  If I try to apply a printed scale to this, the printed scale will have creases where the paper negotiates the angled portion.  Any ideas of how I can manage this without creases?

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

### LED VU meter effect

Does anybody know how can I make a LED VU meter in which only a single light in the row shines at a time? http://i50.tinypic.com/vwr3np.gif That is the desired result: http://i45.tinypic.com/priqb.gif

Topic by blixt139 6 years ago  |  last reply 6 years ago

### Is there an Instructable on the proper use of a volt meter?

Got a volt meter. It came with no instructions and have no idea how to use it.

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

### how to connect the waterflow meter to raspberry pi

Please help in getting the output of the water flow meter tahat consists of a output wire and how we can interface the gpio pins to the water flow meter please help me as soon as possible thanking u all

Topic by avinashd9 2 years ago

### LED VU Meter Coffee Table

I'm working on building a VU meter that will respond to ambient noise into a coffee table that I am making, and I'm stuck on working out how to build the VU Meter circuit, and how to power all the LEDs. I planned on using a 10 LED VU meter kit, and somehow powering more than one LED for each subsequent step. The thing is, each level doesn't have the same amount of steps. The first four levels have 8 LEDs each, the next three have 16 LEDs each, and the last three have 24 LEDs each. The LEDs I'm using have a forward voltage of 2.0 volts, and a Max Power Dissipation of 105 mW. I don't know how to go about powering the LEDs or wiring the circuit. Any help would be much appreciated.

Topic by Ora 9 years ago  |  last reply 9 years ago

### I want to make and old school dial water meter using arduino and flow meter?

I need help making a old school dial meter like the ones used in electricity or auto richshaws. http://static.splashnology.com/articles/Examples_of_Skeuomorphism_in_Graphic_Design/Rickshaw_Meter_app_by_ranganath_krishnamani.png i want to flow water through a flowmeter and record data from arduino. i also want this arduino to control dial meter and show the appropriate numbers depending on the litres flown. i do not have any knowledge of coding , however im alright to prepare the hardware and solder etc! if i has a set of instructions

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

### Cycling Power Meter Details? Answered

Hello, I was wondering if someone could tell me what the specific electronic components of a typical cycling power meter are and how they work together?  The picture is of one by Power Tap that is located in the rear wheel hub.  I'd like to try to build something similar.  All I know is that it uses strain gauges.  I have zero electronics experience but I'm hoping to learn by working the problem backwards. Thanks in advance.

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

### Can we Make Grain Moisture Meter - Link Added

Https://www.youtube.com/watch?v=uwtijjmJaJc Attached Video of the Moisture Meter - I need to make this myself. anyone here to help me

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

### Emco Capacitance Meter (o-o-o-ld)

I have an older capacitance meter made by Emco. Just checked it today. It appears to work ok when I attached the alligator clips to a 2000mF capacitor it made some numbers come up.(I don't know how to read one).It's old, like from the 70s. Takes a 9v battery.Pics tomorrow if anyone is interested.

Topic by Rainbowlaces 9 years ago  |  last reply 9 years ago

### Ultra sonic flow meters

We have 4 independent ultra sonic flow meters and they give us ghost readings at random times. We are sure it’s not emi from an outside source. It’s a frequency signal that our flow computer picks up without product ever running through the pipe system. It only happened at random times like 3 or 4 weeks apart. And are happening more often. Does anyone know best way to troubleshoot.

Question by Kirbyotw 2 months ago  |  last reply 2 months ago

### Hows this circuit as mileage meter? Answered

I recently got permission from my parents to hack the car,so I thought,what mod is most suitable in India.so I came up with an idea of milage meter My dad told me that the amount of petrol used in each cycle of engine is the same,adjusted to optimum level. So I thought that if i can divide the rpm value with speed,i'll get rounds per distance,ie fuel consumption per distance. and i devised the following circuit for it-

Question by Suraj Grewal 4 years ago  |  last reply 4 years ago

### How do I tell if my neighbors are connected to my water meter? Answered

I live in a three apartment unit and there are two water meters. My landlord insists that my other two neighbors are connected and pays for their water. As a single unit with one meter, he can stick me with the bill. However, I have been having some exceptionally high water bills in my current apartment and I suspect that one of my neighbors might be connected to my water supply. Is there any way I can tell, short of calling a plumber and having the water turned off?

Question by randofo 9 years ago  |  last reply 2 months ago

### Ghostbusting

Hello all My friends and I are interested in some fun ghost-busting as a science experiment. We wanted to ask if there was a way to create a cost effective EMF meter to detect paranormal activity. Thanks for your help!

Topic by powerphysician 5 years ago  |  last reply 5 years ago

### Trying to repair micronta 22-164

I have a micronta talking multi meter 22-164 and after I put fresh batteries in it it keeps saying replace batteries. I found out other people have the same problem.

Topic by tim4 5 years ago  |  last reply 3 years ago

### Would plugging one of two prongs of a electrical plug on different outlets have any affect on your power bill?

Here is an example : one prong of a electrical plug is plugged into an outlet in an apartment, while the other prong is plugged into an different apartment's outlet , in doing so, would there be any significant reading off both apartment's power bill/meter?

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

### Wiring analogue VU meters to headphones

I'm trying to wire two VU meters to some headphones so that there is a meter for each channel(one for the right, and one for the left). How would I hook them up? Do I need any special circuitry so that they work correctly? Attached are the meters I have still attached to the board I've salvaged them with.

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

### variable load DC volt meter?

I would like to build my own one of these with more settings and variable load and input voltages. Maybe someone has a more elegant solution? Something that would fit in a small box or maybe even a something to put in between the DC source and my multimeter Voltmeters

Topic by Menthol 9 years ago  |  last reply 9 years ago

### How to make a mains power AC voltage meter for input as an MCU sensor?

Hi, I live off grid and need to keep an eye on various properties from various power sources. This includes, VDC 12-24 from the solar panels, VAC 220 from the fallback generator. VAC 220 from the inverter into the house. I can find off the shelf sensors for the AMPS which can feed into various MCUs I can find circuits to build sensors for AMPS, not a problem. What I cannot find is either off the shelf VOLTS level indicator sensors or circuits that do not involve plugging in walt-warts to bring the voltage down. Space is a premium so ideally I wanted to plug a live and neutral wire into one end of a pcb and have hopefully an analog 0-5 VDC representation coming out of the other. I have in my box some small 6, 9 and 12 unregulated mains VAC transformers. I find it strange that I can buy from China a small LCD with Volts, Amps, Watts and Hertz for about 8€ but not a barebones system which is what I need. So if anyone knows how to either hack one of these Chinese meters to give MCU usable input data or can help me build a meter, I would be very grateful. My son-in-law is an electrician but electronics is alien to him. So he can oversee the safety on big stuff. Thanks and kind regards, jB

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

### LDR Calibration ?

I am planning to build a lumenmeter but I am not getting how to calibirate the LDR and do not have any lumen meter so if could tell the estimate lumens out of a 5w CFL or any other device might help

Question by Bot1398 6 years ago  |  last reply 6 years ago

### Some help with circuit... Ground and negative pole...? Answered

Hello, just a small help. Please look on a scheme. I wonder what should I do with ground. I just leave these wires conected to nothing? And where is here a negative pole? It's not nessesary? This is VU meter.

Question by dava_2 9 years ago  |  last reply 9 years ago

### How can I make a vu meter from an 100ma panel meter?

I want to build an vu meter from my 100ma panel meter but I don't know how to. I am a beginner and it must be cheap . Please help me whit this problem!  I have a panel meter like this

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

### 75 LED VU Sound Meter

Hiya, i want to put 75 leds either side of my sub woofer which act as a sound level meter.  there's a picture shown on how it would look like. 40 Green LEDs 20 Yellow LEDs 15 Red LEDs im have difficulties trying to find the perfect circuit right for this project. any ideas? thanks in advance.

Topic by Major_M 5 years ago  |  last reply 5 years ago

### How to make a speed meter to stop cars from speeding?

Ok folks, I live along a street where people come blasting through, and I want it to stop considering there are kids who kindof like to play on it. Here is born my idea: A speed meter that sits in my yard. If it senses a car going faster then about 30 MPH, it will automatically set off a siren, scaring the crap out of people and making them slow down. I don't want to hear about how this may/may not be illegal, I'll go to jail if its for the sake of saving our kids lives. So I was thinking about how to do this. An Arduino might work...but I would have to find some type of speed meter to use as a serial device for the Arduino, and after I did this, it'd be pretty easy. Just wire up a siren to a relay on one of the Arduino's outputs and away I go. Anybody know where I could find a speed meter that will work with the Arduino?

Question by tyler9613 9 years ago  |  last reply 9 years ago

### Antique megawatt meter (Westinghouse). Anybody ever seen anything like this?

Picked up this barn-find in Cleveland, OH recently. I've tried finding any info on it to no avail. I found it near some massive (equally aged) Babcock & Wilcox pressure meters, so I'm thinking it came from a steam-powered electric plant. I'd love to find a picture of it or if anybody knows anything (or anyone who might know) please pass it along!

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

### How to make a 5 channel Vu meter (equalizer)

Hey guys, I'm planning on building a sound equalizer display aka Vu Meter, with 10 segment LED. My idea is to make a central sound system with analog I/O for 5.1, with three stereo amps DIY kits, each one for Front (LR), Back (LR) and Sub/Central. I've been using a 2.1 Logitech since my Samsung 5.1 home theater died, and its not enough.  At first, I though about buying a new 5.1 system, but my budget is not enough right now, and as I always loved to build myself, I though, why not? In resume, its a central with volume control, LED to indicate volume output, and 5 rows of 10-segment LED for graphic equalizer. I'll attach an image with the sketch of the frontal look. Its not final, but it may be enough. Now the problem: My knowledge about this sound frequency area is pretty poor. I can't figure out how to make each LED Segment for an specific hertz. I'd like to divide it into 60Hz, 230Hz, 910Hz, 3kHz and 14kHz. For material, I'm planning on using laser cutted MDF for the box and glass for the front panel, to give it a "pro" look. I may change it for acrylic in the end.  The tools I own right now are:  1x Arduino Uno R3, which I intend to use it for the prototype and tests. 1x Arduino Mini, I'd rather use this one instead of an non-writtable CI for final project, as I may want to change codes and add stuff to it later. 5x 10-Segment LED Bar 5x Lm3914 I'd like to get to know how to divide and convert the frequencies of the sound into graphic, tips about the code for arduino and material list and mounting guide for each segment... Thanks a lot, I'm sorry for the long text, but I could not figure out how to explain it in other way. And again, thanks!

Topic by deadlyredink 1 year ago

### Signal amp for vu meter- help!

Hi, I am creating a VU meter with my arduino board soon. I would like the vu meter to output the same amount of light even if the input audio is lower or giher (if i change the volume, I dont want the vu meters range to fluctuate). Does anyone know of a device that will maintain a constant signal voltage regardless of whether the inout signal is high or low? I'm not fussed if this amplifying circuit distorts the signal a bit as I am not actually using it to listen to afterwards. Thanks, Joe

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