Engineering Applications with Raspberry Pi and Arduino, A 24-bit analog-to-digital converter called the HX711 converts the small changes in strain from the load cell into 24-bit changes in voltage (Arduino 0-5V). I trying to make a S-Function with the help of the library provided https://github.com “As an Amazon Associates Program member, clicking on links may result in Maker Portal receiving a small commission that helps support future projects.”. If I measured between any other combination of wires, then I got 750 to 850 ohms between them. We chose the red and black wire pair to be the power wires of the load cell. Then, once the zero value is calibrated, ask Arduino to again read the HX711 ADC value with a known calibration mass. 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. If you have some other microcontroller that runs on 3.3V, The code below outlines this process. Switching up red and black will only invert the calibration parameter in the software. The main parts used in this experiment are: 1kg Load Cell + HX711 - $12.99 [Our Shop]. but the same principles apply for other types of four-wire load cells. For Uno/Nano, those are pins 2 and 3. Load the example code to your Arduino. 1. The HX711 amplifier sensor includes a HX711 chip with analog-to-digital conversion capability in 24-bit accuracy. Then it starts outputting the current weight value on the scale. 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. The output result is displayed on the 16*2 LCD. using Load Cell HX711 example code, circuit, pinout library I am assuming that you have the same wire configuration as I have. and also how to properly calibrate it. These pins are labeled with colors; RED, BLK, WHT, GRN, and YLW. Arduino HX711 Description: Arduino HX711 and Load cell– In this Tutorial, you will learn how to use a 5kg load cell with HX711 and Arduino Uno or mega.In this tutorial, you will also learn how to calibrate your load cell or I won’t be doing any alterations of the HX711 library, so the aforementioned statements are the extent to which I will discuss the HX711, apart from wiring. The bottom board holds your home-made scale in place, An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for reading load cells / weight I am using a load cell and an amplifier HX711 with arduino uno and simulink. It should work without any modifications if you connected the DT output of the HX711 module to the Arduino pin 4, and SCK to the Arduino pin 5. A load cell is an application of strain measurements relating to weight measurement. Next, we will explore calibration and test the load cell as a weighing scale. Arduino Code to Read Weight Value from the HX711 Module. Extract the downloaded ZIP file and move it into your Arduino "libraries" folder. Like with the power wires, the polarity is not important. Below is the sample code: The HX711 can be powered anywhere from 2.7V - 5.5V. Or purchase the load cell calibration kit from our store: The HX711 is easily wired to the Arduino using any two digital or analog pins. you can use 3.3V instead of 5V. HX711 load cell can be used with Arduino and programmed easily but first we must add the library of HX711 to Arduino software. Connect the DT and SCK of the HX711 module to any of the Arduino digital IO pins. Description: HX711 and Arduino-This tutorial is based on the HX711 breakout board, Arduino Uno and a Load cell or Strain gauge.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. To download the library, go to the Library Manager in the Arduino IDE and type HX711. I am doing my experiments with a 20 kg load cell, 3. since those are the default pins for the examples of the "HX711_ADC" library. I also have an article about the three-wire bathroom scale load cells: Attaching the Load Cell between Two Plates. In today's article, we will be showing you 10 things you can create with The output of each test The ‘Queuetue HX711 Library’ will be used in this tutorial, and the program used is based off their example. If you have some different color variations, then you have to take that into consideration while following these steps. Refer the image above for your references. 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. I figured the load cell inside was still good, and would be fun to hack. 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