I can't make any bad comment about a wiring. The code below is what I used to connect up to 12 HX711 modules to an Arduino MEGA 2560. The lib just read raw values of the chips. To connect the HX711 to the Arduino you only need 2 pins (Clock and Data). 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. But also notice, that according to the specification of the HX711, the PD_SCK HIGH and LOW time must be at least 0.2 us and according to https://github.com/NicksonYap/digitalWriteFast the read/write takes 0.125 us. You might not need it in the reading part. HX711; the bed uses 4 load sensors (each 1/2 a wheatstone bridge) plus ShowSerialData(); #include "HX711.h" Bravo for your job. The main component of this project is a Load cell and HX711 load cell amplifier module.As you can see, one side is marked with ten kilograms. scale[2] = &scale2; plz reply which library you have used. //scale12.begin(13, 12); Serial.println("Scale12 initialized"); If I understand your code correctly, doesn't that effectively reduce the sampling rate by at least half? 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). display.println("Program"); Serial.println("Initializing the scale"); Serial.print("read: \t\t"); ha! display.setTextSize(2); Does rounding temp solve result in the data getting to the server appropriately? For this to work you should definitely try digitalReadFast, digitalWriteFast, that should help a lot. scale3.set_scale(-523000.f); //(-1246.f); HX711 scale6; This website uses cookies to improve your experience. val4 = scale4.get_units(); Fortunately, there exist many breakout boards for the HX711. scale1.set_scale(-523000.f); // -523000.f seems to give me 1:1 for mV output testing with 5,10,15mV // this value is obtained by calibrating the scale with known weights; see the README for details using Load Cell HX711 example code, circuit, pinout library By controlling them using the CLK they will become more-or-less synchronous sooner or later. I'm looking to understand this problem better so I can fix it also in my copy of this repository. "); You signed in with another tab or window. scale10.set_scale(-523000.f); //(-748.f); 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? val6 = scale6.get_units(); 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. using Load Cell HX711 example code, circuit, pinout library delay(5000); privacy statement. I was using this for one 50k loadcell, eight 10k load cells, and two 5,000psi pressure transducers. Initial settings are all correct and verified. https://github.com/compugician/hx711-multi. HX711 scale2; Granted, all those projects do is read the weight and send it via BLE to I just get a blank reading. scale8.begin(5, 4); Serial.println("Scale8 initialized"); ... May I know how you deal with the condition of load cell reading keep fluctuate? Here we have used a hard plyboard for the frame for placing things over it and a light wooden board as Base. This bug could also appear with one HX711 if you make asynchronous read of the chip. val10 = scale10.get_units(); take a look. // attend 1 How is the procedure order to calibrate the scale? HX711 with a Four Wire Load Cell and Arduino | Step by Step Guide. Normally the value must not change a lot. Using Simulink with load cell and amplifier HX711. Yes for speed I use one arduino nano per channel. Library to interface the Avia Semiconductor HX711 ADC. We use a load cell of 10kg, a module that amplifies the output of load cell and an Arduino. display.display(); I'll put an oscilloscope on the pins, and a logic analyzer to see if the problem is outside or not. value[i] = (read - scale[i]->get_offset()) / scale[i]->get_scale(); You can connect 4 load cells to one chip. I have re-soldered and replaced the connecting wires. I use for test three HX11 with load cells. The load cell calibration and weight measurement will be covered in future articles. 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. Common Load cells have four-wire to connect the HX711 to a microcontroller like the Arduino. It is possible, that you will have more errors while reading, but still: it would be an interesting test... :). //#if (SSD1306_LCDHEIGHT != 64) Your email address will not be published. The HX711 load cell amplifier is used to get measurable data out from a load cell and strain gauge. // by the SCALE parameter (not set yet) // 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. float temp; scale9.set_scale(-523000.f); //(-1246.f); In this article, we are doing the calibration of the load cell or weight measurement. //Adafruit_SSD1306 display(-1); If you have your data from all HX711's (all of them marked as finished), then delete that mark and start again. Serial.println("Before setting up the scale:"); // update display with all of the above graphics One question I have: if one of the HX711 modules has failed or is not plugged in, the code stalls for a long time. Serial.println("HX711 Demo"); Arduino TSL2561 Ambient Light Sensor Interface, Small Size Wi-Fi modules for iot projects. 5kg load cell - Load cells are specially shaped metal parts that have strain gauges glue to them. I am trying to send the value obtained from the load cell to a server using a gprs sim900 module, and i am doing so as follows. 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. So the library works great for one amplifier and load cell. 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). 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. scale10.begin(9, 8); Serial.println("Scale10 initialized"); Serial.print(millis()); Serial.print(" "); Serial.print(val1, 1); Serial.print(" "); Serial.print(val2, 1); Serial.print(" "); Serial.print(val3, 1); Serial.print(" "); Serial.print(val4, 1); Serial.print(" "); Serial.print(val5, 1); I'm wondering if the cheap breadboards and jumper wires could be to blame for the intermittent errors. Sign in Not sure if is relevant but my hx's were modified for 80Hz. In this arduino tutorial of HX711 Load Cell amplifier interface. Serial.println(scale1.read()); // print a raw reading from the ADC GitHub Gist: instantly share code, notes, and snippets. I am using a Sim900 rs232 gprs module and found this method to be most suitable to send data. // wait for falling edge Please, could you send me the readme file? yield(); HX711 scale8; Materiale necessario: 1. Arduino Weighing Machine using Load Cell HX711 Module Load Cell & HX711 Connection: Load Cell Assembly on Base: A base is also required to fix the load cell over it by using nuts and bolts. Serial.println(scale1.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare() So HX711 module amplifies the low electric output of Load cells and then this amplified & digitally converted signal is fed into the Arduino to derive the weight. Scale is designed with -+0.01kg accuracy and switches are used to calibrate digital weight scale. Learn more about hx711, simulink, arduino, load cell, load, maker Simulink But as soon we use more, calling the ‘is_ready’ function becomes asynchronous. And certainly the time spent, I used the HX711 for a probe for my CNC milliing machine. If so, you're in the right place. (See datasheet). display.display(); and data will be wrong. So you might simply write PD_SCK TWICE, which would make it 0.25 us: This is definitely needed at the gain setting part. //HX711 scale12; Overview: In this project we will be “interfacing HX711 Load cell amplifier with Arduino” and 16*2 LCD for designing Weighing Machine using Arduino Load Cell & HX711 Module. If there is load on the load cell then an LED can light up and when there is no load the LED will be off. I planning to use 3xHX711 chips (1 per 2 cells/row). void setup() Parts Needed: Any reference to merchants and particular parts is just that, reference. Would the original library work without here described problems ? HX711 readings. The library is usually used in blocking mode, i.e. Copy link Quote reply Fortunately, there exist many breakout boards for the HX711. char val[20]; I tried the GET method but faced a lot of issues so shifted to this method. }, void loop() Serial.begin(115200); With this method you keep your Arduino busy at all times. Em seg., 8 de jun. HX711 … display.print("YOUR LOGO"); https://github.com/bneedhamia/CurieBLEBowlScale and the project is for a touch probe for a cnc milling machine. Arduino Weighing Machine Working. But what would I need to change if I wanted to set up to 2 load cell and amplifiers? 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. Verify Your Load Cell Wires. It contains an on-chip low noise programmable amplifier with an optional gain of 32, 64 and 128. scale11.set_scale(-523000.f); //(-748.f); Here we have used a hard plyboard for the frame for placing things over it and a light wooden board as Base. ShowSerialData(); // temp=random(1000.12,9999.99); We'll assume you're ok with this, but you can opt-out if you wish. But for now I do think I can live with the read speed. In this project we will be “interfacing HX711 Load cell amplifier with Arduino” and 16*2 LCD for designing Arduino Weighing Machine using Load Cell HX711. What do you need? On 9/12/2016 5:45 AM, Kean Maizels wrote: @matouchat790te https://github.com/matouchat790te Yes, I experienced 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. I'll analyze how to read 24 bits in one call . My load cell has red, black, green, and white wires. HX711 scale7; Your blog post mentions 0.7lb variance for approx 15lb weight in different locations. Click here for instructions on how to enable JavaScript in your browser. Serial.println(scale2.read()); // print a raw reading from the ADC ` 15 sec.) An idea ? Save my name, email, and website in this browser for the next time I comment. out since I decided to just use the serial monitor to view data. I got pulled onto another project, but things should be slowing down for me enough to try it out after next week :), Hi To accomplish this task, I used four load cells which I placed What tolerance resistors are you using? HX711 scale10; Clock. #35 (comment), or // HX711.DOUT - pin #A1 val7 = scale7.get_units(); These four wires are Red, Black, White, and Green/Blue. I am using an Arduino Uno and HX711 amplifier to collect data from a load cell. val2 = scale2.get_units(); It is stripped at the moment of all the other functionality (tare, offset, units, etc.) Hello, 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). Do you still think it's worth splitting out the 11 CLK wires to individual pins? One of many kinds of load cells. // HX711.PD_SCK - pin #A0 Hello all, If I do a squale_power_up / down at each loop, the problem disappear. Load cells are transducers that convert pressure/force into an electrical signal. Through this project, you will be learning how to make a small weighing scale. Seems like a nice way to find the edges of the workpiece. I thought I should try it just to see what happens, and I still like the higher sampling rate I get with that code. About accuracy, if you have a common scale, you will never know how much weight is on which cell. The HX711 is a 24-bit analog-to-digital converter which fits perfectly to weight scale applications. Sign in to view. I wanted to connect the load cell with hx711 to Arduino to check the presence of load. //#include
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