# Current sensor acs712 arduino

24.12.2020 By Maurg

Ac current measurement using acs hall effect current sensor and Arduino.

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In this tutorial, you will learn how to design alternating current measurement system using acs hall effect current sensor and Arduino Uno R3. But you can apply same concept to Arduino mega, pic microcontrollermicrocontroller or avr microcontroller.

In my last tutorial, I have shown how to measure dc current using acs current sensor. In that tutorial, I have also explained introduction to acs hall effect current sensor, working of current sensor and how to measure current from hall effect sensor. I will apply same concepts in this article to measure ac current with acs hall effect current sensor. As I have discussed in my last article, acs current sensor converts input current into proportional voltage depending on nature of the input current.

If input current is dc, the output voltage of current sensor will be dc also. Shape of output voltage depend on the shape of input current. The pin out of hall effect current sensor is given below. So we need a method to measure peak of sine wave and then we can convert this peak voltage back into rms voltage by simply multiplying it with square root of 2 which is the relationship between peak value and rms value of voltage.

I have explained it more details in my last article on interfacing of acs hall effect current sensor with Arduino. I recommend you to read it first, if you want to understand, how to measure this output voltage and how to convert this output voltage back into current using Arduino.

In above code, I have taken samples of output voltage of current sensor and detect the peak value of sine wave. After detecting peak value of voltage, it is converted back into current using the sensitivity formula given in code.

Kindly if u have any idea ,i will be very thankful. I think there is a bug in the libraries which you have downloaded from the website delete those library files and again re download them so that you can get the output. Sir, is this circuit measures the current in zero when we turn off ac power supply? If no Then. Notify me of follow-up comments by email. Notify me of new posts by email.

Table of Contents. How can we measure the ac Voltage using ACS sensor? Kindly if u have any idea ,i will be very thankful Reply. I think there is a bug in the libraries which you have downloaded from the website delete those library files and again re download them so that you can get the output Reply. If yes Then How.Hello everyone! I hope you all will be absolutely fine and having fun. Sensing the amount of current passing through any circuit can be useful in a lot of applications.

The current sensing can also be used to make the decisions regarding safety in over current protection circuits. Simply, we can say that sensing and controlling the flow of the current through the circuits is now a fundamental requirement e. Here I am going to tell you about the components necessary for this projects.

The list of all the components is given below. In this section of the tutorial Interfacing DC Current Sensor with Arduino, I will explain the reasons why I have used the specific components for this project.

I hope you all enjoyed this tutorial. If you face any sort of problem you can ask me anytime in comments without even feeling any kind of hesitation. I will try my level best to solve your issues in a better way, if possible. I am a programmer since before that I just search things, make small projects and now I am sharing my knowledge through this platform. I also work as a freelancer and did many projects related to programming and electrical circuitry.

## Acs712 Current Sensor with arduino measuring current and displaying output on 16×2 lcd

I connected the acs module to Arduino like the figure and tried your code, but it shows the module between negative 28 and 30 amps …… I do not know what to do. I suppose it must be Voltage and Current? You do not show how the LCD is interfaced to the Arduino. You mention pins on the Arduino. How is the pins connected to the LCD?

Thank You.Add the following snippet to your HTML:. ACS current sensor by Allegro is an Hall effect-based linear current sensor. Hall Effect Sensors are transducer type components that can convert magnetic information into electrical signals for subsequent electronic circuit processing. Generally, current sensors use the Hall Effect to convert current inputs into voltage outputs. In the Hall effect, electrons from an electric current flow through a magnetic field plate.

The field then causes the electrons to "push" to one side of the plate and produce a voltage difference between the two sides. The difference in voltage from the side of the plate is the output of the sensor. This sensor operates at 5V and produces an analog voltage output proportional to the measured current.

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This tool consists of a series of precision Hall sensors with copper lines. The output of this instrument has a positive slope when the current increases through the copper primary conduction path from pins 1 and 2 to pins 3 and 4. The internal resistance of the conduction path is 1. This sensor has an output voltage of Vcc x 0.

### Interfacing ACS712 Current Sensor with Arduino – Measure Current with Arduino

The output of this current sensor is analog, so to read it, we can directly measure the output voltage using voltmeter or measure it by using a microcontroller like Arduino through Analog Read pin or ADC pin. For this project, we use a power supply giving output voltage from 0 to 5 Volt and a 1 ohm resistor 8 watt to generate current from 0 to 5 Ampere. We test the sensor by giving 12 measurement points from -2A to 2A input range.

The voltage reading of each corresponding measurement is seen as:.

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This result shows a 2. In conclusion, the ACS current sensor is proven to be able to read electric current and produce an output voltage proportional to the current input. The current-voltage relationship is shown as 2. Please log in or sign up to comment.Acs current sensor interfacing with Arduino for ac and dc current measurement : In this tutorial you will learn how to interface acs hall effect current sensor with arduino? And How to measure dc current using asc hall effect sensor and how to measure ac current using acs hall effect sensor?

Acs is a cheap solution for current sensing in industry, power sector and communication applications. I will also show in this tutorial how to display measured value of currents on lcd and how to send this data to computer using serial communication of Arduino.

Like in power systems protectionac current measurement techniques are used to measure over load current for protection of transformers and generators. I have already posted a project on how to measure transformer health over internet which utilizes this technique of ac current measurement.

And similarly, we use ac or dc current measurement circuits to design ac power meter or energy meters.

It is also used in three phase induction motor current measurement for feedback control.

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So this is all about introduction and some application of ac hall effect current sensor. Now lets start with main topic of this article that is how to measure ac and dc current using acs hall effect sensor. I will first give you introduction of ac current sensor, its working and types of acs current sensors. Acs is hall effect based current sensor.

It can measure both direct current and alternating current. It is a linear type sensor. It has features of noise cancellation, very high response time.

Output error is about 1. If you give dc current to its inputit will give proportional dc voltage at the output of sensor and if you give ac current at the input of acs, it will give you proportional ac voltage at the output. Proportional term depends on the output sensitivity of the sensor.

I will explain proportional sensitivity of acs sensor in later part of this article. Copper conduction path is located around the surface of the die. When ac or dc current passes through a copper conduction path, it produces magnetic field. This electromagnetic field interacts with hall effect sensor. Hall effect circuit converts this electromagnetic filed into proportional voltage either ac or dc depending on input current type.Current sensors can have different applications: power supplies, over-current protection, and motor control to name a few.

In this Arduino current sensor tutorial, we will look at how to read current using the ACS sensor.

ACS712 Current Sensor (30A) Tutorial, 100% Working, Easy Way, Interface With Arduino, Code Given

The strength of this magnetic field gets stronger as the current gets higher. Hall effect is a phenomena when a voltage exists on a current-carrying conductor due to the presence of a magnetic field. In short, the current gets converted to a magnetic field which is then converted to voltage.

The OUT pin produces a voltage proportional to the current read in the input terminals. Converting the output voltage from the sensor to current is straightforward. The datasheet shows this:. It turns out, there are three versions of the ACS Thus, to get the current reading, we use the formula. Where V is the voltage from the OUT pin of the sensor. Note that the current in this formula will be in milliamperes.

Another thing to note is the range of current it can detect. The ACS connects directly to any Arduino board. When there is no current, the serial monitor should display a value of around — 2. The sketch below converts the voltage output from the sensor to current. The serial monitor shows the current reading:. In this sketch, I accumulate the current readings and take their average. Doing this leads to a stabler output. Hope this tutorial was informal for you.

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For questions or clarifications, kindly drop a comment below!Pages: . Alternative to ACS And this gives me a much noise in the top or bottom part of the pulse which should in theory be a straight line. I tried a pre scale factor from 16 to and nothing really changed. Also the ACS only uses an output voltage of 1. Is there any other hall-effect sensor that measures more precise and is availible as a kind of shield? Thank you ver much. Re: Alternative to ACS A shunt resistor is accurate, but not isolated from the Arduino.

A hall-effect sensor is never accurate. Even if you buy a good hall-effect current sensor, it will stil be inaccurate. They are noisy and very sensitive to the way the wires are connected, the copper pcb traces, other wires nearby, and so on. It should be no problem to read a pulse of 5 ms.

That is already hard to achieve for the Arduino itself. You could buy a current meter with a interface, and perhaps that interface can be connected to an Arduino.

So I did a little research in shunt resistors. I considered them but never know that there were some kind of "ready to use"-solutions. Altogether this should be a better method to measure the pulse current? There are probably webshops in your country that sell Adafruit and Sparkfun modules for normal prices. You can get a maximum clock of kHz for the SCL clock.

It seems to have a continuous reading of the shunt data. Perhaps it is possible to get a few thousand current samples per second. But the Arduino Mega needs to calculate that data. Perhaps samples per second is possible, but I think that samples per second is more realistic. That means you will have only 5 samples for the 5ms pulse.

During the I2C bus transaction, the Arduino Mega is waiting until that is finished. It is waiting and doing nothing.

That is one of the major disadvantages of the Wire library. If you are going to use the INA module, I suggest to keep the 0.Tests will be done on an incandescent light bulb, controlled by a light dimmer in series with a reference multimeter and the ACS current sensor module. Upload the code and launch the serial plotter, you should be able to see a sinewave like signal, the red line shows when I turned down the dimmer and the current started having that shape that you usually find in a triac.

So to measure the signal RMS value we gonna keep the same wiring as above but now we need another code that can calculate the RMS. Here you can download the second code from Drive: Download code.

Here you can download the Filters library: Download the library here. Here you can download the Code I used: Download the code here. The code contains a lot of comment to make it easy for you. The correct results are on the middle, the left ones are without calibration, and the right ones are used to demonstrate how to calibrate check the video.

As you saw the huge difference between the two codes response to a non linear signal but the second one act as a TRMS multimeter. ACacsacs 30Aalternatifalternating currentalternating voltageAlternativeArduinoarduino projectarduino tutorialArduino UNO projectbulbDC currentdimmerhigh voltageLcdlightmeasuringOLEDoutletpowerzmptb. Like Like. Like Liked by 1 person. You are commenting using your WordPress.