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load cell arduino with hx711

We are interfacing 40Kg load cell to the arduino using HX711 Load cell amplifier module. Bravo for your job. The lib just read raw values of the chips. Have a question about this project? Or the 80Hz sampling rate, or the 128 gain factor. scale1.begin(A1, A0); Serial.println("Scale1 initialized"); <, Seting Up multiple amplifiers for multiple load cells. We'll assume you're ok with this, but you can opt-out if you wish. But what would I need to change if I wanted to set up to 2 load cell and amplifiers? @bneedhamia you mention adding two resistors to create a wheatstone bridge from those half-load cells. I think all of those things can contribute to signal noise. I have an arduino uno board,4 x hx711 and 4 load cells... And I want to weigh with 4 scales each separately, and each scales to activate a servo. char val[20]; makay68g: I tried a delayMicroseconds(1); after all PD_SCK writing in the HX711-MULTI.cpp code as you suggested but I still get those random high values. Clock. Even after some work I Serial.println("Initializing the scale"); My original debug code was doing too much HX711 scale2; The Bowl project uses one load cell connected to the Red (VCC) Black (GND) Data. The text was updated successfully, but these errors were encountered: Note that option 1 has some limitations (limited gain and limited library support), and relies on your HX711 interface PCB breaking out the channel B input pins. purposes. // val12 = scale12.get_units(); I got it working for 11 connected with one commented out for a future add-on load cell, but it will work for all 12. yield(); //#error("Height incorrect, please fix Adafruit_SSD1306.h! I found a similar AD with same serial link here : http://www.analog.com/media/en/technical-documentation/data-sheets/AD7780.pdf Sign in scale11.begin(11, 10); Serial.println("Scale11 initialized"); val4 = scale4.get_units(); I did not found any. Load cell is connected with HX711 Load cell Amplifier using four wires. Scale is designed with -+0.01kg accuracy and switches are used to calibrate digital weight scale. val8 = scale8.get_units(); On the opposite side you can see the connection for the Load cell. One other way is to use three arduino board and 'OR' the ouputs, but it's not elegant . After uploading the code above and appropriately wiring the HX711 to the Arduino and also ensuring the HX711 is properly wired to the load cell, the code should output a value close to half of 2 24.This allows the load cell to measure both positive and negative load. Toggle navigation Arduino Library List Categories ... HX711 Arduino Library. Hello all, It's simple, just search on google. I planning to use 3xHX711 chips (1 per 2 cells/row). display.setTextSize(2); @detroit54, @matouchat790te: Did you have any success with digitalReadFast and digitalWriteFast? display.display(); I used them in both a dog bed weight scale and a dog water bowl I am using a Sim900 rs232 gprs module and found this method to be most suitable to send data. This tutorial is here to help you get started in the world of load cells and their variants. HX711 scale3; Hi, out since I decided to just use the serial monitor to view data. — I never created a readme file for that code, but you can try looking at this one: https://github.com/bogde/HX711/blob/master/README.md. What is printed by 'Serial.println(temp)' in each case? I am using an Arduino Uno and HX711 amplifier to collect data from a load cell. scale11.set_scale(-523000.f); //(-748.f); scale3.begin(A5, A4); Serial.println("Scale3 initialized"); Hello all. Connect the GND of the HX711 module to the Arduino GND and VCC to the Arduino 5V pin. I guess it's SUM of readings divided by 3 (total of amplifiers)? Of course that is not guaranteed to work forever because of the two-clocks problem, but that could be mitigated either by once in a while re-setting the chip, or otherwise re-synchronizing our timing (to a falling edge, for example, by using your trick)? if (!is_ready()){ temp= scale.get_units(); Learn more about hx711, simulink, arduino, load cell, load, maker Simulink Common Load cells have four-wire to connect the HX711 to a microcontroller like the Arduino. Hope this Serial.println(scale9.read()); // print a raw reading from the ADC }`. The OLED display code is left in case you need it, but commented out since I decided to just use the serial monitor to view data. They are working asynchronously . so moving on Mega . void setup() { but those are easy to implement on your own in or out of the library if you'd like. Materiale necessario: 1. Has anyone in this group ever posted a sketch with the simultaneous use of 4 Load Cells and 4 Hx711? } But sometimes (ie. Hi Your email address will not be published. This comment has been minimized. That is, the first scale when the weight is less than 53g (0-53g) the first servo make 180 degrees else 0 degrees. yield(); I have work in past with1 load cell and + HX711 (bodge library), I want to build a large scale, so I will need 6 load cells. Fortunately, there exist many breakout boards for the HX711. Note: VCC is the analog voltage to power the load cell. Here we have used a hard plyboard for the frame for placing things over it and a light wooden board as Base. VDD is the digital supply voltage used to set the logic level. The load cell is connected with the HX711 Load cell Amplifier using four wires. Your email address will not be published. long HX711::read() { // scale12.set_scale(-523000.f); //(-748.f); Yes you are correct. float val1, val2, val3, val4, val5, val6, val7, val8, val9, val10, val11, val12; So if you set temp manually it works, but if you use scale.get_units() it does not? After uploading the code above and appropriately wiring the HX711 to the Arduino and also ensuring the HX711 is properly wired to the load cell, the code should output a value close to half of 2 24.This allows the load cell to measure both positive and negative load. HX711 with a Four Wire Load Cell and Arduino | Step by Step Guide. //#include Serial.println("HX711 Demo"); //#define OLED_ADDR 0x3C Made a few changes , and now it works. Need to summarize them probably. scale9.begin(7, 6); Serial.println("Scale9 initialized"); Load Cell และ HX711 กับ Arduino 23/04/2019 05/11/2019 admin Content Compression Load , DINI ARGEO , Shear Beam Load Cells , Single Point Load Cells , เซ็นเซอร์วัดน้ำหนัก , โหลดเซลล์ , โหลดเซลล์กันน้ำ One of many kinds of load cells. would occasionally still get an incorrect reading which I would have Value: -8388607 -1891.9 198575 0.0 217965 0.0 <- error ! Like with the power wires, the polarity is not important. Is there any chance to include in it the tare function and calibration? So the library works great for one amplifier and load cell. mySerial.println("AT+HTTPINIT"); //init the HTTP request By clicking “Sign up for GitHub”, you agree to our terms of service and Interfacing Load Cell with Arduino using HX711 Electronic weighing machine uses load cell to measure the load or pressure produced by the load, here most load cells are follows the method of 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. The HX711 is a 24-bit analog-to-digital converter which fits perfectly to weight scale applications. Thanks matay68g, I discover the digitalWriteFast function long HX711::read() { escreveu: The code below is what I used to connect up to 12 HX711 modules to an //HX711 scale12; 3. I was thinking more of parallel processing somehow while continuously reading all pins. // 2. I am trying to carry out a design of a force platform with 4 load sensors. Yes for speed I use one arduino nano per channel. display.println("Cell"); The OLED display code is left in case you need it, but commented Downloads. The bad module can be identified by commenting out one module at a time from the code starting with scale.begin statements. val6 = scale6.get_units(); In all the tests I made the datas were false if the Arduino make a request exactly 12.75ms after the last end of conversion signal. Hi, Serial.println(scale5.read()); // print a raw reading from the ADC // Load cells are linear. I'm not sharing pins. In this example is used the HX711 that is very used in industrial applications. val1 = scale1.get_units(); Connect the middle wires (red) of the load cells to the A+ and A- inputs of the HX711 module. The HX711 add-on library develops the two wire comunication protocol between Matlab workspace and HX711 itself through ARDUINO and also a specific class provides some built in function to calibrate your loadcell. I don't need any speed, so i will use 40Hz not 80Hz. Serial.print(value[i], 1); 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 … Do you think digitalWriteFast(), digitalReadFast(), and pinModeFast() might speed up the HX711 library for reading them one at a time? This Hookup Guide will show you how to get started with this amplifier using some of the various load cells we carry at SparkFun. Serial.print("read average: \t\t"); Never thought about your problem, but i don't see any other way to solve it than summing the 3 readings. scale8.begin(5, 4); Serial.println("Scale8 initialized"); This website uses cookies to improve your experience. 15 sec.) What load cell is and how it works; How to use the load cell module with Arduino Digital Weight Scale using Arduino and HX711 Module (Load Cell) This project is to design digital weight scale that measures weight up to 10kg. instantiate a second HX711 object using a different pair of I/O pins, and use a second HX711 interface PCB, both using channel A for the load cell input - e.g. Disable interrupts has no effect. // by the SCALE parameter (not set yet) You might not need it in the reading part. privacy statement. IIRC this code We use a load cell of 10kg, a module that amplifies the output of load cell and an Arduino. But I don't really understand this well enough to know if it could be made to work. Arduino Weighing Machine Working. Do you still think it's worth splitting out the 11 CLK wires to individual pins? I hope you're not using 5% resistors :) I don't have any experience with this example, I only know how to connect four or more individual load cells. ( Falling edge of DOUT ) This works for one XH711. }, while (!is_ready()) { 101. It's a side project, so I've been working on it during evenings and weekends mostly :) It is exciting to see it starting to work, and I really appreciate all the help! Serial.println("After setting up the scale:"); scale6.set_scale(-523000.f); //(-1246.f); Serial.print("one reading:\t"); These four wires are Red, Black, White, and Green/Blue. Serial.print(" Kg"); //You can change this to kg but you'll need to refactor the calibration_factor HX711 scale6; @matouchat790te Are you sharing a pin for the HX711 clock like A0 in the above example? Click here for instructions on how to enable JavaScript in your browser. Serial.println(scale10.read()); // print a raw reading from the ADC If you manually send a value in a URL of an http request does it work. Serial.println(scale1.read()); // print a raw reading from the ADC In this example is used the HX711 that is very used in industrial applications. // HX711.PD_SCK - pin #A0 display.display(); So to change to 80 samples it's required to lift the pin 15 and solder it to pin 16. The most obvious thing not shown in your code is how you are sending this to the http server. Copy link Quote reply ... been working on a project for school using a HX711 load cell and the code is not being able to be found in my library. scale[1] = &scale1; Also, you’ll see how to use the load cell module with Arduino. scale7.set_scale(-523000.f); //(-1246.f); Arduino Weighing Machine Working. The issue is when you have 6 or 3. My original debug code was doing too much processing or serial output between readings. // set the channel and the gain factor for the next reading using the clock pin for (unsigned int i = 0; i < GAIN; i++) { digitalWrite(PD_SCK, HIGH); digitalWrite(PD_SCK, HIGH); // extend the high clk to be longer digitalWrite(PD_SCK, LOW); And a final approach is to make a a Trigger counter so a value should be above a certain value for 2 or 3 measurements. HX711 scale11; So you might simply write PD_SCK TWICE, which would make it 0.25 us: This is definitely needed at the gain setting part. I'm back on this project now. Downloads. 5kg Load Cell and HX711 Combo Pack Kit - Amazon NOTE for the kit above: One side both holes tapped M4 thread, the other side both holes tapped M5 thread. val7 = scale7.get_units(); Verify Your Load Cell Wires. The sensor used is 2 kg load cell and as a reinforcement of the sensor output load cell used HX711 module which is a module voltage amplifier and ADC (Analog to Digital Converter). If so, you're in the right place. Successfully merging a pull request may close this issue. A+ and A- are the measurement inputs from the cells. Serial.println(scale1.read_average(20)); // print the average of 20 readings from the ADC scale4.set_scale(-523000.f); //(-1246.f); I can't make any bad comment about a wiring. You should be able to read all HX711's at 80Hz: since setting the PD_CLK must take at least 0.4us, reading the bit takes 0.125us, and you also need some time to process the result, so reading 24 bits will take somewhere around 20-50us. Would the original library work without here described problems ? I've had nothing but good luck using the HX711 board from Sparkfun and I will try to avoid that since some of the board are already installed and not easy to get access to, I also had in mind to use 4 small 8bit PIC chip to read the HX711 and send the data to the Arduino on a sequential request. Granted, all those projects do is read the weight and send it via BLE to Now simply you can put any weight for measuring with 99.9% accuracy. Load cells are transducers that convert pressure/force into an electrical signal. It also works if the variable temp receives the value from a random number generating function as shown. วิธีเชื่อมต่อ Load Cell และ HX711 เข้ากับ Arduino >>> ดูสินค้าที่เกี่ยวกับ Load Cell <<< >> Module HX711 (China) Save my name, email, and website in this browser for the next time I comment. The code I posted on June 8, 2020 works for multiple load cells but I am using one HX711 for each four wire load cell. A+ and A- are the measurement inputs from the cells. You can connect 4 load cells to one chip. @compugician - First of all great job with the library. As a data processor, it is used to display information Arduino and measurement values used LabView. By controlling them using the CLK they will become more-or-less synchronous sooner or later. I'll have to do more testing with both methods and see what works best. It contains an on-chip low noise programmable amplifier with an optional gain of 32, 64 and 128. It supports the architectures atmelavr, espressif8266, espressif32, atmelsam, teensy and ststm32 by corresponding PlatformIO targets.. Synopsis Blocking mode. Learn How to Interfacing HX711 Load Cell Amplifier Module with Arduino. I have no time to multiHX711 this morning. HX 711 is a precision 24-bit analog to digital converter (ADC) specially designed for Weigh scales and industrial control applications to interface directly with a bridge sensor. It is possible, that you will have more errors while reading, but still: it would be an interesting test... :). Please, could you send me the readme file? (adsbygoogle = window.adsbygoogle || []).push({}); It is very important to choose correct and perfect Sensor …, Simple 40 Watt Audio Amplifier Circuit designed by using IC …, Passive Infra Red motion sensor mostly used in security based …, In near future every thing (Objects) will get in touch …, LDR (light depended resistor) or photocell sensor, when the light …, Interfacing Load Cell with Arduino using HX711. Sign in to view. using Load Cell HX711 example code, circuit, pinout library display.display(); scale[2] = &scale2; We use a load cell of 10kg, a module that amplifies the output of load cell and an Arduino. Serial.println(scale1.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet) HX711 … My purpose is to get the total weight. @detroit54: when you read 1250 psi intead of 2500 psi, that is a simple bit shift: you missed one bit. The code below is what I used to connect up to 12 HX711 modules to an Arduino MEGA 2560. //#include Interfacing Load Cell with Arduino using HX711 Electronic weighing machine uses load cell to measure the load or pressure produced by the load, here most load cells are follows the method of 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. ( falling edge of DOUT ) HX711 on breakout board - This microchip is specially made for amplifying the signals from load cells and reporting them to another mircocontroller. Cool! in violation of the specifications. Learn How to Interfacing HX711 Load Cell Amplifier Module with Arduino. delay(5000); About accuracy, if you have a common scale, you will never know how much weight is on which cell. Serial.print(scale.get_units(), 1); //scale.get_units() returns a float Library to interface the Avia Semiconductor HX711 ADC ... (ADC) for reading load cells / weight scales. You definitely cannot do that with the "normal" diritalRead/digitalWrite, as it take 50 times more time according to https://github.com/NicksonYap/digitalWriteFast. Serial.print("read: \t\t"); val9 = scale9.get_units(); I was expecting comments about how messy it was! Serial.print("get value: \t\t"); HX711 scale8; Interface HX711 Load Cell Module w/ Arduino to Build a Digital Weight Scale. display.println("Program"); // by the SCALE parameter set with set_scale Em seg., 8 de jun. //#endif Finally!!! Using a scope and look on the "data" out of the HX711 with the "clk" grounded you will see a short pulse 100uS every 100mS (10Hz = converting rate). 4. Is there a way to check to see if the modules are working with a timeout that will allow me to just skip the modules that are either no longer working or not installed? For this to work you should definitely try digitalReadFast, digitalWriteFast, that should help a lot. mySerial.println(url); mySerial.println("AT+HTTPACTION=0");//submit the request With only one HX711 : If we wait for the conversion end signal, all goes well. }, void loop() delay(2000); scale9.set_scale(-523000.f); //(-1246.f); Are you using a separate microcontroller for each board? All 3 are 'ORed ' to produce one signal ''touch'' for the CNC . : I just realized: with digitalReadFast, digitalWriteFast you might be able to read all HX711's in one group. Arduino: questo design utilizza un Arduino Uno standard, dovrebbero funzionare anche altre versioni o cloni di Arduino 2. Arduino MEGA 2560. Not sure if is relevant but my hx's were modified for 80Hz. This is a simple “Arduino Weight Measurement project”.. plz reply which library you have used. Hello, Maybe I'm misunderstanding the original issue, but if the issue that some samples are bad because we're sampling too 'late' after a ready signal, maybe the solution should be to check the timing from the last known good sample, and as long as it is within a threshold of a full cycle we go ahead and sample, and otherwise wait? Do i understand it correctly that you're using a DOUT pin common to all your 12 HX711 ? scale5.begin(A9, A8); Serial.println("Scale5 initialized"); To connect the HX711 to the Arduino you only need 2 pins (Clock and Data). Scale is designed with -+0.01kg accuracy and switches are used to calibrate digital weight scale. //scale12.begin(13, 12); Serial.println("Scale12 initialized"); An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for reading load cells / weight scales. yield(); So right now I have like 5 reads of all 4 HX711 per second, I also did look on the 10/80 times sample and the pin 15 on all the HX711 boards I have here are connected to gnd via a track on the PCB which goes under the HX711 chip. There is a section that discusses how to calibrate in that readme file. HX711 scale_A(DOUT_A, CLK_A); HX711 scale_B(DOUT_B, CLK_B); HX711 scale_C(DOUT_C, CLK_C); HX711 scale_D(DOUT_D, CLK_D); I did remove the check for 2 round and it has been running for a few hours without and "fail" read } To accomplish this task, I used four load cells which I placed and sending the variable "temp" in the http url request. For sure it will shift in time so when trying to read multiply HX711 We’ll occasionally send you account related emails. Reading them sequentionally may slow down the reading, but they migh fall into one line after some time, you might try that too, it is definitely easier to program. Serial.print("read average: \t\t"); The Grove - ADC for Load Cell (HX711) is a 24-bit A/D converter designed specifically for the load cell. Serial.println(scale11.read()); // print a raw reading from the ADC How is the procedure order to calibrate the scale? Best, B = 30 kg // Put on load A // read the analog value showing (this is analogvalA) // put on load B // read the analog value B Serial.print(read); the https://github.com/bogde/HX711 library, connected to an Arduino I recently decided to use a separate amplifier and HX711 object for each load sensor so that I can separately calibrate each load sensor. An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for reading load cells / weight scales. This allows the Arduino to resolve weight (mass) changes down to the range of the load cell (typically 500g, … value[i] = (read - scale[i]->get_offset()) / scale[i]->get_scale(); // OLED display TWI address HX711 *scale[SENSORCNT]; Overview I have a project set up to monitor coffee levels in a carafe in my office. scale6.begin(A11, A10); Serial.println("Scale6 initialized"); Serial.println(scale8.read()); // print a raw reading from the ADC may be I have crosstalk between channels which makes pulses on the wrong clock input. Suggested readings: ... Load Cell Amplifier HX711 Breakout Hookup Guide July 22, 2016. Written by Hanie Kiani Table of Contents. Introduction. "); HX711 Calibration for Arduino. would read all 11 load cells at around 8 Hz, which was fast enough for my I'll add them soon, hopefully, or if someone wants to contribute please do. (adsbygoogle = window.adsbygoogle || []).push({});

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