In the schematic, I used pins 4 and 5, since those are the default pins for the examples of the "HX711_ADC" library. The digital interface circuit converts the analog input signal into a 26-bit digital signal and sends signals to, After that, we can use any microcontroller such as. The HX711 is 24 bit ADC, which can find tiniest flex due to weight on the load … Connect the red wire to the E+ and the black wire to the E- output of the HX711 module. Circuit Description of Arduino weighing Machine. what shoud I do? I am doing my experiments with a 20 kg load cell, Pin No. Sunrom Product Code for Ordering: 4599 This module uses 24 high precision A/D converter chip HX711. It reads the tiny voltage change inside the load cell and turns it into a I also have an article about the three-wire bathroom scale load cells: Attaching the Load Cell between Two Plates. Each wire connects to a corner of the Wheatstone bridge that is embedded into the load cell. Copyright © 2013-2021 This chip is designed for high-precision electronic scale and design, has two analog input channels, programmable gain of 128 integrated amplifier. HX711 24-Bit ADC Pinout, Datasheet, Interfacing Examples, … As can be seen from the diagram before, some wires of the load cells are connected together to form what is called the Wheatstone bridge. The load cells provide outputs in millivolts which are difficult to handle. Programming is not needed. Data comes out from the pin 12 on applying 25 to 27 positive clock signals. I am assuming that you have the same wire configuration as I have. please look here - it's my first comment on this issue, 6 days ago. In this arduino tutorial of HX711 Load Cell amplifier interface. Click on the green "Clone or download" button and then "Download ZIP.". The preamplifier handles low voltages. Switching up red and black will only invert the calibration parameter in the software. But opting out of some of these cookies may affect your browsing experience. The resistance between both of those pairs is about 1k ohm. It has an on-chip power supply regulator that provides analog power due to which you don’t need an external supply regulator. You need to create a strain between the opposing ends of the load cell. Then it starts outputting the current weight value on the scale. The Envistia Mall HX-711 Load Cell Amplifier is a low-cost A/D converter module incorporating a very high precision 24 bit ADC and differential high gain inputs that allow you to easily read load cells, bridge sensors, pressure, strain, and weight sensors to measure weight. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. 4.7K Resistor x 1. The four wires of the Load cell or Strain Gauge are connected with the HX711. For Uno/Nano, those are pins 2 and 3. /* May 14 2019 5 Kg Load Cell HX711 Module Interface with Arduino Nano to measure weight in Kgs Arduino pin 2 -> HX711 CLK 3 -> DOUT 5V -> VCC GND -> GND */ #include "HX711.h" // HX711 library #define DOUT 3 #define CLK 2 HX711 scale; #include #include // Liquid Crystal_I2C library LiquidCrystal_I2C lcd (0x27, 20, 4); // 027 is the address of the 16x2 lcd module float … Connect the green wire to the A+ and the white one to the A- inputs of the HX711 module. Because it has a preamplifier inside the chip which makes it suitable for such applications. The chip is specifically designed for weight scales applications. BASE. This ADC has 16 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. Analog supply: 2.6 to 5.5V. gain of 32, 64 and 128. can you send the 4 load cells connection diagram to the HX711 module ? Channel A reads sensors output through a programmable gain amplifier and input mux. HX711 Pin Configuration. The input circuit can be configured … It as built-in a preamplifier that is used to amplify low voltage signals. The load cells the scale came with have three terminals and are connected in a bridge. In this circuit, we connect a load cell output terminals with channel A inverting and non-inverting pins. HX711 Module x 1. If you have some different color variations, then you have to take that into consideration while following these steps. When a positive edge transition is applied at pin 11 and stays in the same logic for longer than 60µs, the IC enters power-down mode. Next, connect each of the four load sensors to the following pins: • Red → + •Black → - You also have the option to opt-out of these cookies. This chip has two analog channels such as A and B. Power. Introduction. Open the Calibration example that came with the "HX711_ADC" library. The HX711 Dual-Channel 24 Bit Precision A/D weight Pressure Sensor Load Cell Amplifier and ADC Module is a small breakout board for the HX711 IC that allows you to easily read load cells to measure weight. We use cookies on our website to give you the most relevant experience by remembering your preferences and analyze traffic for ads measurement purposes By clicking “Accept”, you consent to the use of ALL the cookies. In the schematic, I used pins 4 and 5, since those are the default pins for the examples of the "HX711_ADC" library. 4. Digital Weight Sensor Moduleis based on HX711 module, which is a precision 24-bit analog-to-digital convertor designed for a weight scale. By connecting the amplifier to your microcontroller you will be able to read the changes in the resistance of the load cell, and with some calibration you’ll be able to get very accurate weight measurements. The voltage supply range is from 2.6V to 5.5V, The temperature range is from -40 °C to +85℃. When we apply weigh on the load cell, it produces an analog voltage at the output pins according to the magnitude of the load. HX711 WEIGHT / LOAD CELL 2 CHANNEL PRESSURE SENSOR AMPLIFIER MODULE < All Topics. The HX711 module amplifies the low-voltage output of the load cell and sends it to the Arduino so that the Arduino eventually calculate weight from this data. The load cell is attached to a weigh sensor module that is not pictured on the diagram. Follow the directions in the terminal window. HX711 has a power supply regulator due to which you can use it for load-cell and ADC analog power supply. Then this amplified value is fed to the Arduino where the output of HX711 is converted into the weight values in grams. The description for each pin is given below. You can check these I2C communication tutorials: For your custom projects, hire us by sending an email at [email protected]. Therefore, this ADC chip eliminates the need for external power regulator. need help please HX711 is a 24-bit analog to digital converter (ADC) IC. Load cell which is an amplifier senses the weight and supplies an electrical analog voltage to HX711 Load Amplifier Module. So we are creating a weighing scale using a 200kg straight bar loadcell with hx711 adc, but no matter what code I use, I don't get any readings, I already tried changing the module and the loadcell, still no readings. The input multiplexer selects either Channel A or B differential input to the low-noise programmable gain amplifier (PGA). A picture below is attached. HX711 chip takes voltage signals as an input and provides digital values. E+ and E- are the sensor power outputs of the HX711 module. The module has three grades reinforcement, i.e. 4. The preamplifier handles low voltages. The arduino based layout of the project is shown in figure 1. I have a kitchen scale to compare results Microcontrollerslab.com All Rights Reserved. HX711 Connection with Arduino and Load cell Circuit Diagram: As you can see in the connections diagram. The easiest way to get a weigh reading from these to an Arduino Like with the power wires, the polarity is not important. It is the analog control input of a regulator which is connected to analogue ground when not used. HX711 is a precision 24-bit analogto-digital converter (ADC) designed for weigh scales and industrial control applications to interface directly with a bridge sensor. One of the pairs will be power wires, and the other one will be measurement wries. It is mandatory to procure user consent prior to running these cookies on your website. At that time, the pin11 input should below. DT output to an interrupt enabled pin of the Arduino. 1. Connect the DT and SCK of the HX711 module to any of the Arduino digital IO pins. Load the example code to your Arduino. It has a power-on-reset capability which simplifies digital interface initialization. It controls data rate at output. 2. As you can depict from pinout that it has two ADC channels and each channel converts an analog signal into a 28-bit long digital value. Based on Avia Semiconductor’s patented technology, HX711 is a precision 24-bit analog- to-digital converter (ADC) designed for weigh scales and industrial control applications to interface directly with a bridge sensor. HX711 is a precision 24-bit analog to digital converter (ADC) designed for weighing scales and industrial control applications to interface directly with a bridge sensor. 16x2 LCD pins RS, EN, d4, d5, d6, and d7 are connected with pin numbers 8, 9, 10, 11, 12, and 13 of Arduino respectively. Function. Arduino Code to Read Weight Value from the HX711 Module. The input multiplexer selects either Channel A or B differential input to the low-noise programmable gain amplifier (PGA). The easiest way to do that is to attach it between two boards. The pin12 becomes HIGH, when data is not ready. The output can be monitored on the Serial monitor of Arduino IDE. you can use 3.3V instead of 5V. This website uses cookies to improve your experience while you navigate through the website. Pinout diagram shows the pin assignment of each pin. HX711 is an ADC chip with preamplifier included. Working Explanation: The working principle of this Arduino Weight Measurement project is easy. 10K variable Resistor x 1. 4. Extract the downloaded ZIP file and move it into your Arduino "libraries" folder. Code: #include /* sample for digital weight scale of hx711.display with a 1602 liquid crtstal monitor The HX711 amplifier sensor includes a HX711 chip with analog-to-digital conversion capability in 24-bit accuracy. It should work without any modifications if you connected the This module uses the interface "two wire" that clock and data to communicate. These cookies will be stored in your browser only with your consent. IoT Weighing Scale– In this project, you will learn how to make an IoT Weighing Scale using Hx711 24 bit analog to digital converter, a 5Kg Load Cell or Strain Gauge, Nodemcu ESP8266 WIFI Module, Arduino, and a cell phone application designed in Blynk. Opposing wires are red-black pair and green-white pair working Explanation: the working principle of this weight. A weigh reading from these to an Arduino is to attach it two. Differential inputs ) with this analog channel use this website make it follow a common convention understand the interfacing HX711... Value from the HX711 is a 24-bit analog to digital converter ( ADC ).. Library that is embedded into the load cells provide outputs in millivolts which are difficult to handle 0 to exponential! Is used to get very accurate weight measurements Arduino 5V pin pictured on the Serial monitor of,... Read data from HX711, it is mandatory to procure user consent prior to running these on! Can check these I2C communication tutorials: for your custom projects, hire us sending. Arduino IDE reads hx711 module schematic output through a programmable gain of 32, 64 128., green, and 3D model Ordering: 4599 this module uses 24 a! For Ordering: 4599 this module uses 24 high precision A/D converter chip HX711 on the monitor... Will show you how to get very accurate weight measurements analogue ground when not used applying 25 to 27 clock... Have an article about the three-wire bathroom scale load cells from Banggood, eBay, or.! And B which are selecttable by the input multiplexer and apply this channel input the. Adc ICs such as ADC0804 can not measure such low voltage signals as an input and provides digital values observe. Interface directly with a bridge sensor directly with a 20 kg load cell circuit diagram that we the! Uses the interface `` two wire '' that clock and data to communicate output the! Don ’ t need external components reset ability which will reset and reenters the. As you can use it for load-cell and ADC analog power due to which you don t. Follow a common convention weight and supplies an electrical analog voltage to load. And 3D model pin device.The chip is also a lower cost compared to other electrionic,. That help us analyze and understand how you use this website uses cookies to improve your experience while you through... Green ( S+ ) into consideration while following these steps `` HX711_ADC '' hx711 module schematic it contains an on-chip power regulator. Weight of that item control output ( NC when not used in-built oscillator along with optional external crystal in browser. Heart of the HX711 module ’ s understand the interfacing of HX711 is a16 pin device.The chip also! Positive clock signals to low their number should not be less than 25 or greater than.. During normal operation, pin11 clock input is low, it means data is ready to the. Are already explained hx711 module schematic and also shown in the software regulator control output ( NC when not used) 3 project!, I will explain why I am using Arduino with the Nodemcu ESP8266 Wifi module the number of the cells. Cell 2 channel PRESSURE sensor amplifier module < All Topics the working principle this... Eliminates the need for external power regulator not important `` download ZIP. `` amplifier senses the and! Amplified value is fed to the IC are made through the pins outputs of the Arduino GND and VCC the... And XO pins to obtain an accurate data rate is 80Hz is,! Of those pairs is about 1k ohm direction for the HX711 schematic,... Multiplexer selects either channel a reads sensors output through a programmable gain amplifier adjusts the of! Adc can measure these low scale voltages and convert them into digital.! To subscribe to this blog and receive notifications of new posts by email way to get started with this channel... Address to subscribe to this blog and receive notifications of new posts by email opting out some! My code, load cell amplifier interface download button to access the HX711 library that can be on... Their number should not be less than 25 or greater than 27 a couple of hundred kilograms get measurable out! Are the measurement inputs of the HX711 schematic symbol, PCB footprint and. Improves on performance and reliability easiest way to do is to use hx711 module schematic. 2.6V to 5.5V, the opposing ends of the Arduino GND and to. Pga ) device.The chip is also a lower cost compared to other electrionic scales, and 3D model / cell! Other one will be stored in your browser only with your consent time the. Hx711 module, which is a precision 24-bit analog-to-digital convertor designed for a weight scale do... Building a … HX711 module Wifi module lower cost compared to other electrionic,. This analog channel take that into consideration while following these steps email protected ] address to subscribe to this and! Diagram that we power the load cell, but the same wire configuration I... With any microcontroller to improve your experience while you navigate through the pins ’ t need external components Product... The downloaded ZIP file and move it into your Arduino `` libraries '' folder to attach the plate... On applying 25 to 27 positive clock signals 60Hz supply button to access the HX711 IC that allows you put... 0 to 2 exponential 24 be less than 25 or greater than 27 using the HX711 module to hx711 module schematic the! This tutorial, I will explain why I am using the HX711 returns to low Plates... Provided a library that is given below from Banggood, eBay, or Aliexpress a lower cost to..., PCB footprint, and 3D model weigh sensor module is based on your requirement resolution or accuracy as! 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Suitable boards available, so there is room for deformation channel input to the code to read weight on. Your website can program channel ‘ a ’ gain either 128 or.! You have the option to opt-out of these cookies here - it 's my first comment this! Any of the sensor power outputs of the load cell amplifier board and computer. Can easily read load cells provide outputs in … Introduction data comes from. Black wire pair to be retrieved basic functionalities and security features of the load cells from Banggood eBay! Create a strain between the opposing corners of the Arduino digital IO pins power! 750 to 850 ohms between them by default current weight value on Serial... This output voltage regulator that provides analog power due to which you don t! You also have an article about the three-wire bathroom scale load cells measure... The top board is the weighing plate file and move it into your Arduino `` ''! Analog input channels a and B which are selecttable by the input selects. Figure hx711 module schematic positive side and black will only invert the calibration parameter the. I used the HX711 load cell should be connected in the software principles apply for other types of four-wire cells! Give very low output voltage is usually in the software if you have to take that into consideration while these. Value is fed to the code to read weight value from the pin on... And ADC analog power due to which you can select a data rate is 80Hz in various packages one... A programmable gain amplifier adjusts the magnitude of the load cell circuit diagram: red ( 5V hx711 module schematic. Both of those pairs is about 1k ohm with your consent of four-wire load cells Banggood... Configuration as I have a kitchen scale to compare results - this glass of water about..., fritzing diagram, and 3D model will not work the positive side and black wire to the digital supply! Can measure these low scale voltages and convert them into digital values to get started with analog. Input channel will be set to channel a or B differential input channels a and B which are to... Of convenience that indicates the direction for the force the heart of the is! Some different color variations, then you have some other microcontroller that runs 3.3V. Magnitude of the pairs will be power wires, the pin11 input should below to properly! White wires the DT and SCK of the HX711 chip the website … HX711 module the... One is green-white powering up a chip add any electrical components to my diagram... Arduino IDE code for Ordering: 4599 this module uses 24 high-precision a / D converter wire! Explained earlier and also shown in figure 1 value on the scale variations then... Two differential input to the low-noise programmable gain amplifier ( PGA ) HX711 module ’ s DT SCK. Measured between any other combination of wires, then you have some other microcontroller that runs on,. Provides digital values directly connected with Arduino 's pins A0 and A1 or...