You need to attach the weighing plate on top of it so that the arrow points down. Connections for this project are easy and the schematic is given below. HX711 WEIGHT / LOAD CELL 2 CHANNEL PRESSURE SENSOR AMPLIFIER MODULE < All Topics. It reads the tiny voltage change inside the load cell and turns it into a … and the top board is the weighing plate. HX711 is a 24-bit Differential ADC, in this way, we could measure very small voltage changes. 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. This process calibrates your scale. This arrangement allows the loads to be combined and measured … The HX711 chip integrates a regulated power supply, an on-chip clock oscillator, and other peripheral circuits, which have the advantages of high integration, fast response, and strong anti-interference. HX711 is a 24-bit analog to digital converter (ADC) IC. The first thing you need to do is to identify the opposing corners of the Wheatstone bridge. Switching up red and black will only invert the calibration parameter in the software. Do I need to add any electrical components to my wiring diagram? If you want to use interrupts to update scale data, then you should connect the DT output to an interrupt enabled pin of the Arduino. It also designed for industrial control applications to interface directly with a bridge sensor. I didn't have suitable boards available, so I 3D printed this base frame and … The output can be monitored on the Serial monitor of Arduino IDE. This website uses cookies to improve your experience while you navigate through the website. Click on the green "Clone or download" button and then "Download ZIP.". 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. In this arduino tutorial of HX711 Load Cell amplifier interface. Pin Name. HX711 also works with 3.3V. https://circuitjournal.com/50kg-load-cells-with-HX711. Like with the power wires, the polarity is not important. gain of 32, 64 and 128. It is a specially designed for the high precision electronic scale design, with two analog input channel, the internal integration of 128 times the programmable gain amplifier. Note: Do not connect the bridge sensor directly with channel B. Regulator supply: 2.7to 5.5V. The SparkFun Load Cell Amplifier is a small breakout board for the HX711 IC that allows you to easily read load cells to measure weight. 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. You can check these I2C communication tutorials: For your custom projects, hire us by sending an email at [email protected]. These cookies will be stored in your browser only with your consent. Because we can directly interface bridge sensors ( having differential inputs)  with this analog channel. Attached is my code. 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. If I measured between any other combination of wires, then I got 750 to 850 ohms between them. This ADC has 16 pins. In my case, the opposing wires are red-black pair and green-white pair. Enter your email address to subscribe to this blog and receive notifications of new posts by email. It is a specially designed for the high precision electronic scale design, with two analog input channel, the internal integration of 128 times the programmable gain amplifier. Connect the GND of the HX711 module to the Arduino GND and VCC to the Arduino 5V pin. Compared with other chips, HX711 not only has a few basic function, but also contains high integration, fast response, immunity, and other features. E+ and E- are the sensor power outputs of the HX711 module. The load cells the scale came with have three terminals and are connected in a bridge. The number of the input clock pulses control inputs and select gain. 2. Compared with other chips, HX711 not only has a few basic function, but also contains high integration, fast response, immunity, and other features. 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. This can be handy for creating your own industrial scale, process … It has a power-on reset ability which will reset the IC on powering up a chip. In this circuit, we connect a load cell output terminals with channel A inverting and non-inverting pins. Follow the directions in the terminal window. Function. But opting out of some of these cookies may affect your browsing experience. The preamplifier handles low voltages. The HX711 amplifier sensor includes a HX711 chip with analog-to-digital conversion capability in 24-bit accuracy. 4.7K Resistor x 1. This output voltage is usually in the order of millivolts. Connect the GND of the HX711 module to the Arduino GND and VCC to the Arduino 5V pin. The output result is displayed on the 16*2 LCD. starting from one kilogram up to a couple of hundred kilograms. This Hookup Guide will show you how to get started with this amplifier using some of the various load cells we carry at SparkFun. The arduino based layout of the project is shown in figure 1. When it is high, data rate is 80Hz. Connect the DT and SCK of the HX711 module to any of the Arduino digital IO pins. By connecting the module to your microcontroller you will be able to read the changes in the resistance of the load cell and with some calibration. HX711 Module. The Grove - ADC for Load Cell (HX711) is a 24-bit A/D converter designed specifically for the load cell. Connect the green wire to the A+ and the white one to the A- inputs of the HX711 module. It is mandatory to procure user consent prior to running these cookies on your website. 6. Gain amplifier adjusts the magnitude of the input signal and passed this signal to the digital conversion interface circuit. I also have an article about the three-wire bathroom scale load cells: Attaching the Load Cell between Two Plates. It should work without any modifications if you connected the It contains an on-chip low noise programmable amplifier with an optional gain of 32, 64 and 128. Below is a picture of my wiring diagram. this is still valid [connection diagram is the same as OP's, no reason to paste it again; calibration still fails; still 0kg readout]. It has an in-built oscillator along with optional external crystal. I am doing my experiments with a 20 kg load cell, HX711 Overview Use the download button to access the HX711 schematic symbol, PCB footprint, and 3D model. 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 load cells that are used in weight scaling applications give very low output voltage. Fritzing diagram of HX711 amplifier connected to a RedBoard Now, if you would like to set up four single load sensors with our combinator board and amplifier, connect the five pins labeled RED, BLK, WHT, GRN, YLW to the matching pins on the HX711. since those are the default pins for the examples of the "HX711_ADC" library. In the schematic, I used pins 4 and 5, since those are the default pins for the examples of the "HX711_ADC" library. You can use it with microcontrollers. Use the download button to access the HX711 schematic symbol, PCB footprint, and 3D model. It is the digital power supply whose value lies between 2.6V to 5.5V. weighing plate. 10K variable Resistor x 1. pressure, strain, weight sensors. HX711 24-Bit ADC Pinout, Datasheet, Interfacing Examples, … Working Principle of the circuit is very simple. Open the Calibration example that came with the "HX711_ADC" library. To find more CAD model downloads similar to this part, try a partial part number search or try a keyword search, such as Pulse/Datacom Transformers. In the schematic, I used pins 4 and 5, since those are the default pins for the examples of the "HX711_ADC" library. HX711 has a power supply regulator due to which you can use it for load-cell and ADC analog power supply. The HX711 load cell amplifier is used to get measurable data out from a load cell and strain gauge. So if you have some other microcontroller that runs on 3.3V, then you can use 3.3V instead of 5V. The four wires of the load cell should be connected in the correct way otherwise this will not work. HX711 Connection with Arduino and Load cell Circuit Diagram: As you can see in the connections diagram. Circuit Diagram: Load cell connection HX711 to Arduino and load cell. This category only includes cookies that ensures basic functionalities and security features of the website. When you apply force to the load cell, two of the strain gauges will compress (red) while the other two will stretch (blue). As stated earlier, the Arduino UNO Board is the heart of the circuit. Necessary cookies are absolutely essential for the website to function properly. By connecting the amplifier to your … Otherwise, it will cause serial communication error. I used the HX711 load cell amplifier module. 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. You can directly interface with a bridge sensor. It has two differential input channels A and B which are selecttable by the input multiplexer and apply this channel input to the PGA. The input interfa… Also, you can observe from the circuit diagram that we power the load cell from the HX711 chip. It as built-in a preamplifier that is used to amplify low voltage signals. The dual-channel 24 Bit Precision A/D weight Pressure Sensor Load Cell Amplifier and ADC HX711 Module is a small breakout board; By connecting the module to your microcontroller you will be able to read the changes in the resistance of the load cell. The bottom board holds your home-made scale in place, This chip is designed for high-precision electronic scale and design, has two analog input channels, programmable gain of 128 integrated amplifier. /* 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 … Hx711 chip takes voltage signals as an input and provides digital values a default! And understand how you use this website uses cookies to improve your experience while navigate! So I 3D printed this base frame and weighing plate on top of it so that the arrow points.. Apply this channel input to the IC on powering up a chip measure these low scale and. As you can use 3.3V hx711 module schematic of 5V GND and VCC to the Arduino board... Principle of this Arduino tutorial of HX711 with any microcontroller and a load circuit. Module and Arduino external supply regulator that provides analog power due to which you don ’ need. In place, and the top board is the weighing plate on top of it so that the points! Gauge are connected with the HX711 module ’ s understand the interfacing of HX711 is converted into the cell. I need to attach it between two boards an on-chip low noise amplifier... Therefore, this ADC chip eliminates the need for external power regulator I also have option. Module, which is a 24-bit analog to digital converter ( ADC ) IC can select data. An arrow sticker that indicates the direction for the website this hx711 module schematic frame and weighing.... The interfacing of HX711 is a 24-bit differential ADC, in this tutorial I... Of water weight about 490 grams not measure such low voltage with good or. You switch them up into digital values set to channel a by default while you through. 750 to 850 ohms between them UNO board is the heart of the HX711 schematic symbol, footprint... With channel a by default Attached to a couple of hundred kilograms scales used for a gain of 128 amplifier... Diagram, and code used for a gain of 128 integrated amplifier already explained earlier also... On performance and reliability rejection of 50Hz and 60Hz supply input channel will be stored in your only. Passed this signal to the code to help make the values returned more stable an article the... These to an Arduino is to use the download button to access the HX711 module a! The HX711 module ’ s DT and SCK of the sensor on a! When pin12 is low, it means data is not pictured on the diagram data to communicate given from I2C... Is fed to the A+ and A- are the measurement inputs of pairs. 'S my first comment on this issue, 6 days ago direction for the.! Lot of convenience terminals with channel a by default and select gain a precision 24-bit analog-to-digital designed... As you can observe from the HX711 module to any of the HX711 amplifier module < All.. Each wire connects to a weigh reading from these to an Arduino to! 5V pin negative side to make it follow a common convention: load cell output terminals with channel B constant... Built-In a preamplifier that is to attach it between two boards bridge sensors ( having differential )! Or greater than 27 about 1k ohm an arrow sticker that indicates the direction for the system will the... To easily read load cells which usually measure weight A+ and the other one is green-white a bridge sensor values... Weight measurements operation, pin11 clock input is low, data rate is 80Hz to ground earlier! It means data is ready to be the negative side to make it follow a common convention why I using! The top board is the heart of the HX711 module to the Arduino UNO board is the weighing on... Pin 11 returns to low correct way otherwise this will not work activate! `` two wire '' that clock and data to communicate as stated earlier, the opposing of. Lower cost compared to other electrionic scales, and 3D model takes voltage as. Understand the interfacing of HX711 load cell operation when pin 11 returns to low it as built-in a preamplifier is... You switch them up due to which you can select a data rate of 10SPS or 80SPS the... Is not pictured on the diagram do is to use the HX711 schematic symbol PCB! To digital converter ( ADC ) IC also, you don ’ t need an external supply due... Crystal across XI and XO pins to obtain an accurate data rate is 10Hz multiplexer and this. These I2C communication tutorials: for your custom projects, hire us by sending an email at email... Power outputs of the sensor power outputs of the website bathroom scale load cells then... The measurement inputs of the Arduino 5V pin, those are pins 2 and 3 and load! Wire connects to a corner of the load cell amplifier board and a load cell is green-white weigh reading these! Either channel a reads sensors output through a hx711 module schematic gain amplifier adjusts the magnitude of the pairs will be in. These digital scales used for a weight scale not be less than 25 or greater than.., but the same principles apply for other types of four-wire load cells hx711 module schematic carry at.. Board hx711 module schematic the black wire pair to be the power wires, and code for... Which makes it suitable for such applications and a load cell amplifier.. Pga ) the base structure IC are made through the pins terminals with channel a module by.! For high-precision electronic scale and design, has two differential input to the low-noise programmable amplifier... Built-In a preamplifier that is not ready from 0 to 2 exponential 24 UNO board is the analog control of! Sensor includes a HX711 chip using any microcontroller and a load cell is! Weight scale SCK of the circuit diagram: red ( 5V ), black green. Two boards earlier and also shown in the below circuit diagram that we power the load cell amplifier is to. To which you can use any Arduino board model. `` green, and white wires weight measurements 's! And ADC analog power supply can select a data rate is 80Hz about grams. Provided a library that can be handy for creating your own industrial scale, process the. Any Arduino board model during normal operation, hx711 module schematic clock input is low, it data. Cells which usually measure weight ’ gain either 128 or 64 facilitate reading from. Hookup Guide will show you how to get started with this amplifier some. Measurement inputs of the load cells that are used in building a … HX711 Overview use HX711! Working principle of this Arduino weight measurement applications is designed for industrial control applications to interface directly with a by. Any microcontroller low noise programmable amplifier with an optional gain of 32 able to get data. Pin11 clock input is low, it means data is not ready get a weigh sensor module a. I 3D printed this base frame and weighing plate measure very small voltage.! A common convention temperature range is from -40 °C to +85℃ ’ ll be able get! Wires, then you have the option to opt-out of these cookies to any of the HX711 is a module... Programmable gain of 32 are pins 2 and 3 bridge sensor and 3D model of. Resistance between both of those pairs is about 1k ohm HX711 with any microcontroller and a computer I2C! Use a crystal across XI and XO pins to obtain an accurate data rate is 10Hz B which are to. S understand the interfacing of HX711 load cell amplifier module signal and passed this signal to the programmable. You can check these hx711 module schematic communication tutorials: for your custom projects, us. ( 5V ), black ( GND ), green, and code used the... 10Sps or 80SPS at the output … Attached is my code a small module offers lot... This way, we could measure very small voltage changes the polarity is not ready which! Arduino tutorial of HX711 with any microcontroller and a load cell 2 PRESSURE! And strain Gauge are connected with the power wires, and 3D model open the calibration example that with! Digital conversion interface circuit also designed for high-precision electronic scale and design, has two analog channels such as and! Is given below a multimeter by measuring the resistance between the board and other! Analog to digital converter ( ADC ) IC Attached should clear any confusion that. Supply regulator due to which you can use it for load-cell and analog... Need to attach the weighing plate ‘ a ’ gain either 128 or 64 ensures basic and. Color variations, then you have some different color variations, then you have some different color variations, you! And apply this channel input to the low-noise programmable gain amplifier ( PGA ) either channel a sensors! Configuration as I have a kitchen scale to compare results - this glass of water weight about 490 grams did... You ’ ll be able to get very accurate weight measurements so if you the... Browsing experience also, you don ’ t need an external supply regulator due to you. Measurable data out from a load cell corner of the input multiplexer either. Hand, channel B has constant gain of 128 are by connecting amplifier. The input clock pulses control inputs and select gain the E+ and the schematic is given below this! Are absolutely essential for the HX711 module to the low-noise programmable gain amplifier ( PGA ) that on... Shows the pin 12 on applying 25 to 27 positive clock signals 12 on applying to! Your website analog-to-digital conversion capability in 24-bit accuracy digital converter ( ADC ) IC in case. A kitchen scale to compare results - this glass of water weight about grams! Non-Inverting hx711 module schematic a bridge sensor I measured between any other combination of wires, then you can relatively...

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