Load the example code to your Arduino. 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! I found a dead scale at work, the electronics were fried. You need to create a strain between the opposing ends of the load cell. The easiest way to do that is to attach it between two boards. The load cells plug into this board, and this board tells the Arduino what the load cells measure. I recommend calibration before each use, and whenever the environment changes or the load cell is moved. The HX711 is easily wired to the Arduino using any two digital or analog pins. The HX711 load cell amplifier is used to get measurable data out from a load cell and strain gauge. “As an Amazon Associates Program member, clicking on links may result in Maker Portal receiving a small commission that helps support future projects.”. I also have an article about the three-wire bathroom scale load cells: Attaching the Load Cell between Two Plates. Extract the downloaded ZIP file and move it into your Arduino "libraries" folder. In today's article, we will be showing you 10 things you can create with Make sure you put some spacers between the board and the load cell, so there is room for deformation. The equation for a line is: which leads to our final definition of the calibration line using two known masses: The linearity over multiple masses reassures us that the two-point calibration method suffices! You just need to recalibrate in the software if you switch them up. Hi! The 3D printed components can not handle the 20kg weight that this The simplest way to install the driver is to download the HX711 library. The simplest way to understand the calibration is to use the HX711 ADC reading with no added mass (tare). and SCK to the Arduino pin 5. The load cell must also be accurately wired to the HX711 to ensure that the appropriate strain gauge leads are used to approximate the weight given by the load cell. Using known calibrated masses, we were able to create a routing that calibrates the load cell and approximate mass. The full data sheet with specifications for the HX711 can be found here. Download the ZIP file below > Open Zip File > Extract to your Arduino Uno Library folder. In the schematic, I used pins 4 and 5, If you want to use interrupts to update scale data, then you should connect the Then I connected the other end to the base structure. If I measured between any other combination of wires, then I got 750 to 850 ohms between them. The output of each test https://circuitjournal.com/50kg-load-cells-with-HX711. I trying to make a S-Function with the help of the library provided https://github.com Moreover, an LCD module of type LCM1602 IIC V1 is used to display the measured weight. On the opposite side you can see the connection for the Load cell. load cell is rated for, but it is strong enough for my experiments. E+ and E- are the sensor power outputs of the HX711 module. 3. Calculation for Calibration Factor of Load Cell: To use any measuring instrument, we must have to calibrate it for exact readings. If you have some different color variations, then you have to take that into consideration while following these steps. We chose the red and black wire pair to be the power wires of the load cell. The use of this library was found to be the easiest and most stable to implement in terms of performance. ョンは、すぐに入手できる既製の部品を使用して小さな計量スケールを作成する方法を説明しています。 必要な材料: 1. I also went through the process of plotting several different calibrated masses against the load cell HX711 readout in order to verify this linearity at multiple strains. Refer the image above for your references. It asks you to put a known mass onto the load cells and then enter the weight of that item. An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for reading load cells / weight Open the Calibration example that came with the "HX711_ADC" library. The load cell has an arrow sticker that indicates the direction for the force. 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. I have a kitchen scale to compare results The resistance between both of those pairs is about 1k ohm. But do you know what else you can do with it? In this project we will be “interfacing HX711 Load cell amplifier with Arduino” and 16*2 LCD for designing Arduino Weighing Machine using Load Cell HX711. These pins are labeled with colors; RED, BLK, WHT, GRN, and YLW. weighing plate. The HX711 amplifier sensor includes a HX711 chip with analog-to-digital conversion capability in 24-bit accuracy. 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