https://circuitjournal.com/four-wire-load-cell-with-HX711, https://www.thingiverse.com/thing:2624188, The HX711 amplifier module with the 50kg load cells, It would be helpful to have some extra wires, Two 1k resistors if you want to create the single-cell circuit. Connect the other diagonal to the A+ and A- inputs of the HX711 module. This can get a little confusing. So we will try to remove the error from the weighing scale. Push-button Switch is a connected digital pin D4 of ESP8266. A step-by-step guide in video form. Switching will only invert the calibration parameter in the software. Arduino Code to Read Weight Value from the HX711 Module. This may come bundled with your load cell but is available very cheaply as a separate item from many sources. Connect the DT and SCK of the HX711 module to any of the Arduino digital IO pins. 2. 2 x 50kg (100 kg / 220 lbs). You can connect four cells to a loop that forms a single scale unit: 1. A+ and A- are the measurement inputs from the cells. 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. The YLW pin acts as an optional input that not hook up to the strain gauge but is utilized to ground and shield against outside EMI (electromagnetic interference). Using Four Load Cells in a Single Circuit. Thanks in advanced. Load cell connection HX711 to Arduino and load cell. Load cells generally consist of a spring element on which strain gauges have been placed. “How to Electronics” is an electronics engineering community built and run by passionate electronics engineers. //This can be used to remove the need to tare the scale. In addition to your load cell or load cells, you will need: An Arduino. The project consists of Arduino, Load cell and HX711 load cell amplifier board and a computer. If you want to use interrupts to update scale data, then you should connect the you should verify the wires. The HX711 Weighing Sensor uses a two-wire interface (Clock and Data) for communication. Connect the outer wire pairs to E+ and E- output of the HX711 module. We will make a Weighing Scale Machine which can measure weights up to higher-value like 40KG. So first calibrate the whole assembly unit. If you are having an offset in you load cell, you need to add a resistor to compensate. since those are the default pins for the examples of the "HX711_ADC" library. You will need one library to make the code compile. In the schematic, I used pins 4 and 5, A base is also required to fix the load cell over it by using nuts and bolts. Yes, you’ll need 4 x ‘matched impedance’ load cells and connect them in a Wheatstone format…or 2 x for a half Wheatstone Bridge. Before connecting the load cells to the HX711 amplifier module, Using Four Load Cells in a Single Circuit. A push button is provided to bring the weight reading to zero, this function will be explained in detail at the end. Then measure the resistance between the two red wires. Using Two Load Cells in a Single Circuit. One white-black pair goes to the E+ and the other black-white pair to the E-. This is a simple “Arduino Weight Measurement project”.. The loadcell connects to a HX711 load cell amplifier that then goes to an Arduino Micro. Please help me. In this arduino tutorial of HX711 Load Cell amplifier interface. Mounting the 50kg Bathroom Scale Module to a Wooden Board. Automatic paint filling machine with load cell, pnumetic cylender and aurdino based. 3. We use a load cell of 10kg, a module that amplifies the output of load cell and an Arduino. The HX711 and Load cell are used in building a weighing … Load cells are used to measure weight. Following are the components required for this Weighing Scale Project. Connect the middle wires (red) of the load cells to the A+ and A- inputs of the HX711 module. The component purchase link is given below. Using a High-resolution ADC which can be interfaced with the Arduino. 1 x 50kg (110 lbs). and between white and red or black and red is 1k. The HX711 load cell amplifier is used to get measurable data out from a load cell and strain gauge. Connect the middle cable (red) of one of the diagonals to the E+ and E- outputs of the HX711 module. 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 strain gauge, Circuit diagram, Soldering, Programming, and … Open the Calibration example that came with the "HX711_ADC" library. 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, 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. Each color corresponds to the conventional color coding of load cells : You can use virtually any type you like but I used the Nano as it has the USB interface built-in and still only costs a few pounds. Wiring the Load Cell to the HX711 Module and Arduino. Any microcontroller’s GPIO pins should work making it easy to read data from the HX711. Arduino Uno-based electronic weighing machine by 5-wire 3 kg load cell. using YZC-161B Sensor example code, circuit, pinout library Also, you’ll see how to use the load cell module with Arduino. Looking at the manufacturer's web site of that scale, it seems that the load cells offer a 4-20 mA signal to the K420-K401-A display unit which then displays the weights. Digital Weight Scale using Arduino and HX711 Module (Load Cell) This project is to design digital weight scale that measures weight up to 10kg. In theory 4 x 5 kg = 20kg…provided a single load cell is not overloaded beyond it’s spec’s by weight being placed more on one corner. Extract the downloaded ZIP file and move it into your Arduino "libraries" folder. Once the calibration is done, we can include that factor in our code. using YZC-161B Sensor example code, circuit, pinout library HX711 also works with 3.3V. 1. The Resistor 10Ω connected between pin 8 & 9 is responsible for Gain of INA 125 instrumentation amplifier, the output is taken combined from Vo and Sense (Pin 10 & 11) and it is fed into Arduino analog pin A0. A load cell is a type of transducer, specifically a force transducer. Both of them should be around 2k ohms. 2. This is required as load cell bends slightly when some weight is placed over it. You can do it with a simple multimeter. Of so how? The reading of the scale roughly varies plus/minus ten grams while the scale sits still. That is, the first scale when the weight is less than 53g (0-53g) the first servo make 180 degrees else 0 degrees. Each cell is rated for 50 kg / 110 lbs. Using a Single Load Cell. 1 x 50kg (110 lbs). The output signal produced by the load cell is in range of millivolts, so we need an amplifier to convert the signal into a level that we can later transform it into a digital signal and process it. This means you have to add a spacer between the board and the outer rim of the load cell. Overview. Over the years, many RobotShop customers have asked us about the easiest way to interface a load cell with an Arduino board so they can get accurate weight measurements. These extremely small changes can be acquired with strain gauges. Load cell connection HX711 to Arduino and load cell. I found this one from Thingiverse that worked perfectly for me: Using Four Load Cells in a Single Circuit. The HX711 is easily wired to the Arduino using any two digital or analog pins. using GML692 Sensor example code, circuit, pinout library the ultimate overload of 150% (75 kg / 165 lbs per cell). Load the example code to your Arduino. Press z,x,c,v to decrease calibration factor by 10,100,1000,10000 respectively. So once you have established two data pairs, you can interpolate the rest. then you can measures up to 4 x 50 = 200 kg / 440 lbs. A push button is provided to bring the weight reading to zero, this function will be explained in detail at the end. When i add sugar it will measure only sugar. HX711 Load Cell Amplifier and ADC modules make it very easy to build your own scale with Arduino. 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