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July 20, AT pm Easily measuring inductance with Arduino. Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.Measuring an inductor is not something that most multi-meters can do.
The circuit works by feeding a signal in from the Arduino. This waveform is affected by the LC circuit, filtered by the comparator chip, then read back out the other side by the Arduino. That resulting signal is a square wave, which is an easy target for the Arduino to measure. Hahaha I was literally just about to look this up and it was in my RSS feed.
I just need a few components. This is a good way to get a ballpark figure for getting a ballpark figure for inductance, but if you want good results, get a real LCR meter.
Things are actually a bit different. And, just like some previously seen arduino projects, he misses the already existent internal comparator… in some other cases built in SPI interface, USART etc. Yes I agree with your comments, and you must keep in mind that this is for the individual who needs an idea of the inductor:.
If you require a very accurate measurement for a system running at a high frequency, then this method is definitely not for you. And yes this method uses low current to measure inductance, so saturation information will be unavailable. Yes you will get better results with an LCR meter that allows you to select measurement frequency. This circuit can be made pretty accurate enough for many peoples use case very simply using a few known reference parts.
Frequency can be adapted in the tank oscillator in both software and the load capacitance and also adding a series reference inductance to get decent nH readings.
The only real thing to avoid here is the AT which has crummy timer precision, or to increase the size of the tank capacitance. Matt thanks for the info! Just use a freaking good LCR meter to measure your reference components plus a few test components. Jeez people you are giving up without thinking of solutions. Houston, for one, and I am sure they are in every other metropolis in America, probably also throughout Europe.
Inductance Meter Using Arduino
Naysayers abound…and they only use mega-dollar equipment. The rest of us live in the real world and use our brains to accuratize our measurements with less expensive solutions. Please disregard my post. Sorry to disappoint the sceptics but i found this article very useful.
Thank you Mike. This site uses Akismet to reduce spam. Learn how your comment data is processed. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Learn more. Report comment. Yes I agree with your comments, and you must keep in mind that this is for the individual who needs an idea of the inductor: If you require a very accurate measurement for a system running at a high frequency, then this method is definitely not for you.
Leave a Reply Cancel reply. Search Search for:. Hackaday Links: July 12, 28 Comments. Hackaday Made Me Buy It!All embedded lovers are familiar with multimeter which a great tool to measure voltage, current, resistance etc. A multimeter can measure them easily. But sometimes we need to measure inductance and capacitance which is not possible with a normal multimeter. There are some special multimeters that can measure inductance and capacitance but they are costly. In this project, we will show the inductance and capacitance values along with the frequency over 16x2 LCD display.
A push button is given in the circuit, to switch between capacitance and inductance display. In this project we are going to measure inductance and capacitance by using an LC circuit in parallel.
This circuit is a like a ring or bell which start resonating at certain frequency. Whenever we apply a pulse, this LC circuit will start resonating and this resonance frequency is in form of analog sinusoidal wave so we need to convert it in squire wave. Now we measure the frequency by using Arduino and by using some mathematical calculation we can find the inductance or capacitance.
We have used the given LC circuit frequency response formula. As we already mentioned that our wave is sinusoidal wave so it has the same time period in both positive and negative amplitude. So that we can measure it by using pulseIn function of Arduino. This function will give us a time period which can be easily converted into a frequency by inverting the time period. As pulseIn function measure only one pulse, so now to get correct frequency we have to multiply it by to 2.
Now we have a frequency which can be converted into inductance by using the above formula. Note: while measuring inductance L1capacitor C1 value should be 0. In this LC Meter circuit diagramwe have used Arduino to control the project operation. In this, we have used an LC circuit.
Measuring self-inductance & ESR
This LC circuit consists of an Inductor and a capacitor. To convert sinusoidal resonance frequency to digital or square wave we have used operational amplifier namely Here we need to apply negative supply to op-amp to get accurate output frequency. So we have used a 3v battery connected in reverse polarity, means negative pin is connected to battery negative terminal and positive pin of the battery is connected to the ground of the remaining circuit.
For more clarification see the circuit diagram below.You are worried about the calculation for the value of the inductor. The only easiest method is to use an inductance meter. The inductance meter or LC meter does not get through a cheap rate.
So, for this reason, the beginners in electronics who can not buy this one.H22a turbo build
But in most of the inverter, converter, booster circuit, and Class d amplifier needs the inductor. I just make a class d amplifier but I can not know the taken inductor is in the 22uh range or not.
Too much tension and sadness happen to me. I think all electronic hobbyist should have this inductance meter. This will helps in doing several electronics projects. In this days several free circuits are available for making inductance meter. But they are very difficult to code. Yes great with a cheap rate we can build an inductance calculating meter. I designed a code for inductance meter using Arduino programming software.
At last of this article I pasted my working code of Inductance meter. This code will helps you when you want. Mehandi the inductance is defined as the ability of the coil to restrict the passage of current through it. The inductance can be measured in Milli Henry or microhenry. The inductance can be measured using a frequency generator or using an oscilloscope. To find out the inductance the basic formula is described as the bacterium of depending on the inductance x the rate of change in current.
The inductor in parallel with the capacitor is called us an LC circuit. When we measuring the inductance the added inductor changes the oscillator frequency and calculating the change in frequency we will analyze the exact inductance of the inductor.
The microcontroller purchase Atmega p analyzing analog signals. The at mega p can be sampling the analogue signal at hz. The ship specially designed for converting the analogue signal to digital signals. The voltage difference in the LC circuit become positive then the LM IC start to floating and give a pull up through the resistor.
When the voltage difference in the LC circuit becomes negative then it will pull up to the ground. In this circuit we are applying a frequency to the LC circuit.
It is about five volt comparing with the IC of at mega After that the resonating frequency can be calculated by using the formula and displayed using 16 cross 2 LCD display.
An inductor has as beside its most important property the self-inductance, also parasitic properties. The most important of these are the internal series resistance and the parallel capacitance. The series resistance, also known as the ESR, is mainly determined by the ohmic copper resistance of the windings. The parallel capacitance is formed by the individual isolated windings laying next to each other.
The measure methods in this article can only determine the self-inductance and ESR. To measure the parasitic capacitance too, a more sophisticated method must be used as described in the article Parasitic properties. To get usable measuring results, the measure frequency has to be chosen correctly. The designated work frequency of the inductor can be used as a rule. The self-inductance of inductors that include an iron or ferrite core are very dependently on the driving amplitude.
If possible, use the the work conditions or lower. Applying a too high drive amplitude will result in measurement errors. The first method describes a self-inductance and ESR measurement by using a triangle shaped current.
The inductor to test is connected to a function generator who is outputting a triangle shaped voltage. An oscilloscope is used to measure the voltage across the inductor. The function generator must set at a high as possible output voltage where the inductor doesn't overdrive.
The frequency is adjusted so that the voltage across the inductor is kept low as possible but high enough to be measured accurate. In this way the inductor is, as it were connected to a current source. The top-top current, or current difference is: Fig.
For completeness, here is also the coil current is measured, however, this is not necessary. Self-inductance If voltage is applied to an inductor the current will increase linear in time: [A] The opposite is also true: If an linear in time increasing current flows through an inductor, a constant voltage across the inductor can be observed.
And when a triangle shaped current is flowing through an inductor, a squarewave voltage V L can be found across the coil. The oscilloscope screen shot doesn't show a clean square wave, the horizontal line shows an incline. This incline is caused by the voltage across the ohmic portion of the inductor. After all, the voltage across a resistor is proportional to the current. The voltage belonging to the inductive part is the mean top-voltage V L.
The self-inductance is than: And the ohmic resistance is: Measuring with a sinewave To measure an inductor with a sinewave voltage, the inductor is added to a halve bridge circuit who is powered by a sinewave generator.July 19, Comments.
Measuring inductance with a handful of cheap common parts is certainly possible. There is 1 digital output and 1 digital input, so this will work with most micro controllers. The only thing left is to measure the rising edge to falling edge time on a square wave.
LM, LM comparison and a picture showing bell like behavior. An inductor in parallel with a capacitor is called an LC circuitand it will electronically ring like a bell. We will electronically strike the LC bell, wait a bit to let things resonate, then take a measurement. Now micro controllers are terrible at analyzing analog signals.
As soon as the voltage on the LC circuit becomes positive, the LM will be floating, which can be pulled high with a pull up resistor. When the voltage on the LC circuit becomes negative, the LM will pull its output to ground. Since our wave is a true sinusoidal waveit spends equal time above zero volts and below zero volts.
This measurement can then be doubled to get the period and the inverse of the period is the frequency.Cachas de plata y oro
Since the circuit is resonating, this frequency is the resonating frequency. To the left are the equations where f is the resonating frequency, c is capacitance, and L is inductance. Solving for inductance will result in the last equation. The RLC will still resonate, but the amplitude will die out. With a low resistance the RLC will tend to latch onto the exact resonating frequency quicker.
Pick whichever circuit is better for you, but the one using the LM is better. Both the capacitors are 1uf metalized film, but anything that is non polar will work. It will need to be very close to 2 uF though. You can not use a capacitor that marks which connection is ground. One thing you may notice is that the LM is geared for analog computing.
Remember that the LC circuit will vary above and below ground. Using the common LM op amp. D2 is a 1N too. Code for Arduino — With large inductors, you may need to increase the timeout on pulseIn from to Not accurate enough?
What does this mean? Well this means that the inductor is in between uH and uH. This method uses low current to measure inductance, so saturation characteristics will be unavailable measurements will be taken in an unsaturated state. There is this wonderful thing called permeability.
Filling an inductor with certain materials changes the inductance without changing the coils. This is similar to mutual inductance in transformers. Another method that doesn't work well with Arduino.
You could make a metal detector.2020 pf song zambia
If you have access to fast sampling rates, you can use the method on the right too, but it will require a p type mosfet to really pump some current into the inductor and R1 less than an ohm or so, but greater than the equivalent series resistance of the inductor. Filed under Guides.2020 09 743yj5ba 2017 sahp pack non els
About Moser Electrical Engineer who loves to bike!Well here we are going to build an inductance meter using the Arduino microcontroller. Using this method we are able to calculate inductance about 80uH to 15,uH, but it should work for inductors a bit smaller or much larger.
A typical inductance meter is nothing but a wide range LC oscillator. And by calculating this frequency change, we can deduce the inductance depending on the measurement. Micro-controllers are terrible at analyzing analog signals. As soon as the voltage on the LC circuit becomes positive, the LM will be floating, which can be pulled high with a pull up resistor.
When the voltage on the LC circuit becomes negative, the LM will pull its output to ground. So what we will do is applying a pulse signal to the LC circuit. In this case it will be 5 volts from the arduino. We charge the circuit for some time. Then we change the voltage from 5 volts directly to 0. That pulse will make the circuit to resonate creating a cushioned sinusoidal signal oscillating at the resonant frequency. What we need to do is to measure that frequency and later using the formulas obtain the inductance value.
So we modified the above equation in that way to find unknown inductance from the circuit. Then the final version of the equation is:. Returns the length of the pulse in microseconds.
The timing of this function has been determined empirically and will probably show errors in longer pulses. Works on pulses from 10 microseconds to 3 minutes in length. In that project I use serial communication at the baud rate of to watch result on Serial monitor. A total of 8 LCD displays can be connected to the same two wire I2C bus with each board having a different address.
Great instructable, thanks : One question, though -- why would using a capacitor of greater value increase the range of the inductance meter?Nlp tasks github
And by how much? During the negative cycle the diode is likely to be forward biased provided the Arduino power supply ground has a diode that will prevent this Is there a better solution to that and how much will that impact our readings.
Reply 3 months ago. Use NPN transistor e. That would generate a negative spike making it much worse I guess a shottkey diode across it should do the trick. Nice design. I have always had a problem with the inductance meters that are built into mt multimeter. Introduction: Inductance Meter Using Arduino. About: Electrical engineering student. UET, Pakistan. Believed on practice rather then theory.
In short just practical.
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