In this arduino tutorial of HX Load Cell amplifier interface. We are interfacing 40Kg load cell to the arduino using HX Load cell amplifier module. HX is a precision bit analogto-digital converter ADC designed for weigh scales and industrial control applications to interface directly with a bridge sensor. The input multiplexer selects either Channel A or B differential input to the low-noise programmable gain amplifier PGA.
Channel B has a fixed gain of Onchip power supply regulator eliminates the need for an external supply regulator to provide analog power for the ADC and the sensor. Clock input is flexible. It can be from an external clock source, a crystal, or the on-chip oscillator that does not require any external component. On-chip poweron-reset circuitry simplifies digital interface initialization. There is no programming needed for the internal registers.
All controls to the HX are through the pins. Datasheet: HX Most Load cell have four wires red, black, green and white. Connect load cell. Load cell comes in various weights depending on your application select the load cell weight specification, In this tutorial I have used 40Kg, Precision Grade C2 load cell. Load cell also have precision type. Load cells are ranked, according to their overall performance capabilities, into differing accuracy classes or grades.
A specific accuracy grade specifies an error envelope for certain parameters, such as linearity, hysteresis, temperature effects, creep, etc. In practice, certain system accuracy parameters depend considerably on the application of use, physical load introduction to the transducer and disturbing factors such as Zener barriers and surge protection devices.
Load cells with different accuracy classes are required depending on the application. The chart provides an overview of typical applicationsranging from the lowest to the highest accuracy class. Load cells with relatively low accuracy classified D1 to C2 are sufficient for simple building materials scales used to weigh sand, cement or water.
Adding the right proportion of additives to building materials is essential. For this purpose, special building materials scales using accuracy class C3 load cells are available for mixing additives such as ash or sand.
Accuracy class C3 load cells are widely used in machine construction as well. Here, scales contribute to quality assurancefor example, when ball bearings are checked. However, increased accuracy is needed with shop-counter scales or scales used in filling machines. Grams or micrograms are required here. Load cells used in these applications comply with accuracy classes C3 to C6. You can see a arrow is shown on Load cell.
You can make arrangement shown in figure using metal strips. Attach metal strip on the Load cell using bolts. Once you upload the calibration code, open serial monitor and adjust your scale factor with known weight until you see the correct readings.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. The goal of the digikey-kicad-library library is to offer a collection of visually consistent and well defined parts that include assigned footprints. The library is intended to augment KiCad's default library and give users another choice in library paradigm meaning that it is One Solutionnot The Solution.
It contains 1-to-1 symbol to footprint assignments to meet the needs of those who prefer that style. It does not currently include the idea of a one symbol to many footprints as that defeats the purpose of having an orderable part number ready for the Bill of Materials.
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Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. An atomic parts library for Ki-Cad. Branch: master. Find file.This chip is designed for high-precision electronic scale and design, has two analog input channels, programmable gain of integrated amplifier.
The input circuit can be configured to provide a bridge voltage electrical bridge such as pressure, load sensor model is an ideal high-precision, low-cost sampling front-end module. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Communicating with the Balance Module requires a driver for the HX sensor. The simplest way to install the driver is to download the HX library.
Refer the image above for your references. Download the sample source code below, open and upload this sample source code into your Arduino IDE. NOTE : You can change your calibration factor before uploading the code OR you can adjust it later in the serial monitor box since the code allow you to add and substract the value of calibration factor.
When you has succesfully uploaded the sample source code into your Arduino Uno Board. Open Serial Monitor and it will show u as shown in the picture above.
You have to calibrate only once for each load cell. We did not use the correct calibration factor. You have to set your own calibration factor for your load cell. Check on this video and tutorial to learn on how to set the calibration factor for load cells. Remember that each load cell with different weight ie. Thus, you will have to set calibration factor for each load cell with different weight.
Thanks for the instructable - it has helped me get going quickly with my project using the HX One thing though: I was slowed down by the use of the. I don't have any program on my PC that extracts that type of file. This is just a few dozen lines of code, so I don't understand why it would need to be compressed.
Simply inserting the text so someone could copy and paste would be easiest. Next easiest would be to make the uncompressed Arduino. Reply 7 weeks ago. In fact, to make it even easier for others and myself, should I need it againI'll just paste in the code contained HX Useful in permanent scale projects.
Reply 10 hours ago. I can suggest you to download 7zip, it's an open source software and handels pretty much every kind of compression even tar. Cheers, happy making. Question 6 weeks ago on Step 3.Digi-Key has the product portfolio, service, tools, resources, and know-how to support students and educators in their quest for STEM education.
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Arduino Weighing Scale with Load Cell and HX711
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Navigate to the digikey-symbols folder within digikey-kicad-library folder. At this point you can add one library at a time or all of the libraries. This will select all of the libraries, then click the Open button. Expand the digikey-kicad-library folder and select digikey-footprints. All Rights Reserved. Continue Continue Privacy Notice.
ReidLandsrud August 1,pm 1. Open Symbol Editor or Schematic editor B. Click on the Project Specific Libraries tab: D. Click on the Add existing library to table button: E.
Navigate to the digikey-symbols folder within digikey-kicad-library folder G. You should now see the libraries in the table: Import the footprints similar process to symbols : A. Click OK H. The digikey-footprints should now show in your library table. KiCad Library Simulation Errors.A load cell is an application of strain measurements relating to weight measurement. A load is applied to a strain gauge, which causes the gauge to strain a certain amount and output a voltage proportional to the applied load.
This relationship between strain and voltage is used in many applications where weight measurement is important. Load cells are very common because of their linearity, cost effectiveness, and their ease of implementation. In this tutorial, I will introduce an Arduino-compatible load cell that exemplifies all of the aforementioned advantages. I will also introduce calibration with known masses to create a powerful and accurate weighing system that can be used for highly accurate measurement purpose such as: chemistry, horticulture, cooking, and much more!
The use of this library was found to be the easiest and most stable to implement in terms of performance. The HX simple example demonstrates the basic functionality for getting the scale working.
Tutorial to Interface HX711 Balance Module With Load Cell
Below is the sample code:. The HX can be powered anywhere from 2. The full data sheet with specifications for the HX can be found here. The HX is easily wired to the Arduino using any two digital or analog pins. The load cell must also be accurately wired to the HX to ensure that the appropriate strain gauge leads are used to approximate the weight given by the load cell. Next, we will explore calibration and test the load cell as a weighing scale.
The load cell is quite sensitive and depending on the changing environment, calibration may be essential. I will outline a method using two calibration points: the zero tare value and a calibrated mass value. The calibrated mass method will ensure that each time the load cell is used, it will be calibrated with a known mass, ensuring the best approximation of mass of objects of unknown mass.
I recommend calibration before each use, and whenever the environment changes or the load cell is moved.
Using the equation for a line we can begin to understand how calibration will take place and how we will specifically implement calibration with an Arduino board and load cell.
The equation for a line is:. The linearity over multiple masses reassures us that the two-point calibration method suffices! The simplest way to understand the calibration is to use the HX ADC reading with no added mass tare. This will create an up-to-date linear calibration slope and intercept, ensuring the most accurate weighing. The code below outlines this process. Using known calibrated masses, we were able to create a routing that calibrates the load cell and approximate mass.
This weighing scale routine was implemented in real-time to create a highly accurate weighing scale that is both portable and inexpensive - all using Arduino and Arduino-compatible components.
The load cell weighing scale can be used to measure strain in real-time and allow engineers to record and ultimately study changes in mass and weight. Cart 0. Sign In My Account.We have seen these pressure sensing gates at many malls and showrooms, which automatically opens when someone is standing near the door and get closed after that person is gone.
So here we are also creating the same Automatic Gate which will sense the pressure and get opened automatically and will remain open until that pressure or weight will be there. This gate will be closed automatically as soon as the weight is removed. This automatic gate can also be built using PIR sensor like here.
Here for demonstration purpose, we have used simple DC motor as the gate and a hard cardboard as a platform for putting the weight, check the demo Video at the end. For more Raspberry Projects, check here.
Load cell is transducer which transforms force or pressure into electrical output. Magnitude of this electrical output is directly proportion to the force being applied. Load cells have strain gauge, which deforms when pressure is applied on it. And then strain gauge generates electrical signal on deformation as its effective resistance changes on deformation.
A load cell usually consists of four strain gauges in a Wheatstone bridge configuration. Load cell comes in various ranges like 5kg, 10kg, kg and more, here we have used Load cell, which can weight upto 40kg.
Now the electrical signals generated by Load cell is in few millivolts, so they need to be further amplify by some amplifier and hence HX Weighing Sensor comes into picture. HX has two analog input channels and we can get gain up to by programming these channels. Load cell is connected with HX Load cell Amplifier using four wires. Below the connection details and diagram:. In order to make this whole setup work, we have to install Load Cell under the ground in front of the door, so that it can sense the weight of person standing near the door.
But here for Demonstration purpose, we have fixed the Load cell under a hard cardboardwhich will serve as a platform where we can put the weight and can test the gate. Load cell has also been fixed with Wooden Base with the help of nuts and bolts, so that it will remain still.
Below are some pictures of the setup:. Connections for this Automatic Gate project are easy and schematic is given below. Load cell connections with HX module are already explained earlier and also shown in the below circuit diagram. Then this amplified value is fed to the Raspberry Pi. Then Raspberry Pi compares the value with reference weight and drives the gate accordingly by using motor driver IC LD. Here we have used DC motor for demonstrate it as gate.
Here we have used Reference weight of grammeans if someone greater than gm will be standing there near the door, then only gate will be opened. And the gate will closed when we remove that gm or the person is gone. You can change the reference weight accordingly. An optional 16x2 LCD is used for displaying gate status.
Here we have used Python for the Programming. We have just followed the datasheet of HX and application notes. Although there are some libraries present for this purpose, where you only need to include that library and you can get the weight using few lines of code. After it, we have created below function for reading data from HX module and return its output.