The specific load cell that were using is the fx 1901 compression load cell. Most strain gauge load cells work in very similar ways, but may vary in size, material, and mechanical setup, which can lead to each cell having different max loads and sensitivities that they can handle. Hx711 load cell or strain gauge and arduino, calibration. Thus you will notice from your arduino readings that the output voltage across green and white is way too small to be measured with any meaningful precision by the arduino. Here we have used a hard cardboard for the frame for placing things over it and a wooden board as base. If you are using only one load cell per scale, you would connect it as you say correctly. One load cell to each load cell amplifier and then to the arduino. Tutorial to interface hx711 balance module with load cell.
Load cells require a power source and produce a very small voltage differential when under strain. In order to do that, i need to read the analog value and then set that value to a variable, like x, when the zeroing button is pressed. In this tutorial, it is shown how to utilize an arduino uno, a hx711 breakout board, and a load cell in order to measure weight. Now do the connections as shown in the circuit diagram and you are ready to go. In this project we will be interfacing hx711 load cell amplifier with arduino and 162 lcd for designing arduino weighing machine using. To get much clearer understanding of how you might interface the load cell, the ina125, and an arduino, check out this arduino project, as well as this one. Using a highresolution adc which can be interfaced with the arduino.
Hx711 is a 24bit adc, which amplifies and digitally converts the load cell output. Interfacing a load cell with an arduino board robotshop. All the arduino 00xx versions are also available for download. Jun 25, 2016 share on tumblr electronic weighing machine uses load cell to measure the load or pressure produced by the load, here most load cells are follows the method of strain gauge, which converts the pressure force into an electrical signal, these load cells have four strain gauges that are hooked up in a wheatstone bridge formation.
In this project we will be interfacing hx711 load cell amplifier with arduino and 162 lcd for designing arduino weighing machine using load cell hx711. We will be using a simple arduino library to communicate with the hx711 that provides a calibration and tare reset feature to easily determine the weight of an object. Micro load cell fc10c is a upgrated version from fc10,low heat emmision due to its higher resistance700ohms makes it more durable compared to normal 350ohms version on the market. Weigh objects with an arduino scale arduino project hub. You can amplify the load cell s output voltage signal, then feed it into the arduino s adc. In this arduino tutorial of hx711 load cell amplifier interface. Jul 10, 2017 a base is also required to fix the load cell over it by using nuts and bolts. I stripped out the load cell, and connected it to an arduino with a hx711 amplifier 24 bit adc. I am using a load cell curcuit with an arduino mega and controling an operation with labview. Hx711 and arduinothis tutorial is based on the hx711 breakout board, arduino uno and a load cell or strain gauge. Load cell senses the weight and supplies a electrical analog voltage to hx711 load amplifier module. In this post we are going to learn about strain gauge based load cell. Source code for interfacing hx711 load cell with arduino.
On the opposite side you can see the connection for the load cell. Load cell amplifier hx711 breakout hookup guide learn. The arduino ide can be used on windows, linux both 32 and 64 bits, and mac os x. The output of the load cell is too minute for an arduino to read on its own, so i picked up a nov 19, 2014 2. Arduino based digital weight scale with load cell engineer. Solvedworkedaround having problems with hx711 load cell. The starterkit includes a book with 15 tutorials that will walk you through the basics up to complex projects. Dec 04, 2017 the load cell has four wires, which must be connected to the first four pins of the hx711 module.
The hx711 load cell amplifier is used to get measurable data out from a load. Take your students on a fun and inspiring journey through the world of programming and electronics. Jun 20, 2019 load cell which is an amplifier senses the weight and supplies an electrical analog voltage to hx711 load amplifier module. Combining a arduino micro and a hx711 circuit board to make an inexpensive usb control board for racing simulator pedals that use a load cell for the brake and potentiometers for the gas and clutch. Yes, a single arduino can in theory take as many scales as the number of digital inputs you have can provide. I bought a load sensor sn10245 with 3 wires black, white, red and i also bought the load cell amp hx711 which need a 4 wires input. I want to use only one load cell, but i saw on internet that these load cell need another load cell to work. If you open serial terminal in the arduino ide or visuino, you will see the value measured by the picture 2. We will be exploring what strain gauge is, what load cell is, temperature effect on strain gauge, temperature compensation with wheatstone bridge and load cell amplifier hx711, and finally we will learn how to build an arduino based weighing scale machine by implementing load cell as the weight sensor. Arduino weight measurement using load cell and hx711. Arduino as load cell amplifier by christian liljedahl christian. This is a simple arduino weight measurement project the electronic weighing machine uses a load cell to measure the weight produced by the load, here most load cells are following the method of a strain gauge. Working with a load cell and an arduino use arduino for projects.
The brain of the project is as always the arduino, you can use any arduino board model. Working with a load cell and an arduino we built a system that uses eight airclamping cylinders mcmastercarr 62185k64 to push down on a piece of glass to seal it to a sidewall. I would like to create a tear button for the load cell just like a scale would have. Mount one end of the weight load cell to some surface, as example the corner of a desk or table with clamp or in any other way picture 1. This product is sourced from another supplier, but it or a similar replacement with a compatible form, fit and function is estimated to be available for as long as it is available from the supplier. The first thing that about load cells that always comes to my mind is the circuit which amplifies the load cells signal, usually the load cell signal changes in a low mv range, so you have to put a high gain circuit in the way of the signal, which amplifies signal and noise. Just connect the boards as shown in the picture below and load our sample code to check that the system is working see the sample code section below. The output can be monitored on the serial monitor of arduino ide.
Arduino scale with 5kg load cell and hx711 amplifier. Load cells only make a very small change in voltage, so you have to use an instrumentation amplifier to increase. Open the arduino ides library manager and search for hx711 arduino library. A load cell left hand side and an hx711 breakout board right hand side.
I stripped out the load cell, and connected it to an arduino with a hx711 amplifier. The sensor that we want to use is a load cell an arrangement of strain gauges. My load cell and the hx711 board do work fine with an arduino uno and 5v with an arduino uno and 3. You can use a prepackaged instrumentationamp ic like the ina125. Digital weight scale using arduino and hx711 module load cell this project is to design digital weight scale that measures weight up to 10kg. Price match lets you match the price of any item we sell with a competitors price. Hx711, load cell strain gauge and arduino uno to measure weight arduino hx711 and load cell duration. In this project, we did not use any library for interfacing hx711 load sensor with arduino. Dec 04, 2017 in this tutorial, it is shown how to utilize an arduino uno, a hx711 breakout board, and a load cell in order to measure weight.
Continue with the next step to see how to calibrate the. The source code archives of the latest release are available here. We are using a library written for the hx711 to communicate with the arduino, you can find a link to download the library at the bottom of this page. Working with a load cell and an arduino posted date. Apr 21, 2018 in this project we will be interfacing hx711 load cell amplifier with arduino and 162 lcd for designing arduino weighing machine using load cell hx711. The load cell has four wires, which must be connected to the first four pins of the hx711 module. The first thing that about load cells that always comes to my mind is the circuit which amplifies the load cell s signal, usually the load cell signal changes in a low mv range, so you have to put a high gain circuit in the way of the signal, which amplifies signal and noise. Hx711 and arduino this tutorial is based on the hx711 breakout board, arduino uno and a load cell or strain gauge. When we apply load the strain gauge resistance will change and. Arduino weight measurement using load cell and hx711 module.
Arduino tension scale with 40 kg luggage load cell and. We use a load cell of 10kg, a module that amplifies the output of load cell and an arduino. I found a dead scale at work, the electronics were fried. In this article, all these aspects are briefly explained with the designing and programming. The load cells plug into this board, and this board tells the arduino what the load cells measure. Then, based on your load cells sensitivty spec, you can see that, for even the maximum capacity load, the output voltage would be on the order of only a few millivolts. Arduino weight measurement project with load cell and hx711. Share on tumblr electronic weighing machine uses load cell to measure the load or pressure produced by the load, here most load cells are follows the method of strain gauge, which converts the pressure force into an electrical signal, these load cells have four strain gauges that are hooked up in a wheatstone bridge formation. The two common approaches for interfacing a load cell with an arduino are. The hx711 and load cell are used in building a weighing. Hx711 is a precision 24bit analogtodigital converter adc designed for weigh scales and industrial control applications to interface directly with a bridge sensor. Upload this sketch to your arduino board you need two loads of well know weight.
Download the zip file below open zip file extract to your arduino uno library folder. We are interfacing 40kg load cell to the arduino using hx711 load cell amplifier module. Amplifying the load cell s output voltage signal using a prepackaged instrumentation amplifier ic like the ina125 to be processed by the arduino s adc. Make sure it is gripping the edge of the load cell, the green arrow is pointing down, and the clamp is not touching the white epoxy. Dec 28, 2016 hx711, load cell strain gauge and arduino uno to measure weight arduino hx711 and load cell duration. All you need to do is connect the wires to the hx711 board in the correct orientation. The values will have little meaning at the moment, as we have not calibrated the scale. For a few possible load cell mechanical setups, check out the hookup guide with the load cell setup. A standard micro load cell outputs mv signal from the wheatstone bridge,the output range is normally between 0mv and 20mv which is proportional to the applied force. Jun, 2019 the project consists of arduino, load cell and hx711 load cell amplifier board and a computer.
Ordering online an instrumentation amplifier isnt an option due to the arrival date of the piece and the time i have to finish the project. Load cell high resolution measurement for load cells. Working with a load cell and an arduino use arduino for. Nov 25, 2016 in this arduino tutorial of hx711 load cell amplifier interface. If you mount a small platform on the load cell, as would be done in a small scale, this load cell provides accurate readings regardless of the position of the load on the platform. These boards and modules are the best to start learning and tinkering with electronics and coding. Digital weighing scale using load cell and arduino. Jan 24, 2015 working with a load cell and an arduino posted date. Hx711 on breakout board this microchip is specially made for amplifying the signals from load cells and reporting them to another mircocontroller.
This tutorial explains step by step how to use the load cell or strain gauge with the hx711 breakout board and how to write a basic arduino uno program to access the values and print them on the serial monitor. When we apply load the strain gauge resistance will. To connect the hx711 to the arduino you only need 2 pins clock and data. I think that it is possible to change my 3 wires load cell to a 4 wires by using a half bridge. The simplest way to install the driver is to download the hx711 library.
In this project, we have used arduino to control whole the process. Test the load cell by adding weight to the platform to confirm that the circuit is functioning properly and a good range of readings is possible. I figured the load cell inside was still good, and would be fun to hack. So once you have established two data pairs, you can interpolate the rest. Digital weighing scale using load cell and arduino homemade. A base is also required to fix the load cell over it by using nuts and bolts. A load cell is an electronic sensor for measuring weight and force.
Then this amplified value is fed to the arduino where the output of hx711 is converted into the weight values in grams. Next, the hx711 module is connected to the arduino uno. For this program to run you need hx711 library download from here hx711master. Moreover, an lcd module of type lcm1602 iic v1 is used to display the measured weight. Get started with arduino using entry level products. Active development of the arduino software is hosted by github. The parts needed for connecting the load cell to the shield. Arduino education is committed to empowering educators with the necessary hardware and software tools to create a more handson, innovative learning experience. Arduino weight measurement project with load cell and. With the arduino ide serial monitor running, note the analogue readings being received from the arduino load cell circuit. This assembly can be used with arduino uno, mega r3 or similar boards. Arduino uno search on aliexpress amazon jumper wires search on aliexpress amazon.
899 1338 228 1072 1067 1048 1395 92 929 1332 709 1101 323 747 240 1559 1096 1390 1134 116 415 640 1013 93 239 904 548 1320 1425 235 1405