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. For this purpose, special building materials scales using accuracy class C3 load cells are available for mixing additives such as ash or sand . lcd.setCursor(0,0); Arduino Code to Read Weight Value from the HX711 Module. I want a arduino sketch and schematic diagram. Data Sheet: http://www.ti.com/lit/ds/symlink/ina125.pdf, // Arduino as load cell amplifier // by Christian Liljedahl // christian.liljedahl.dk // Load cells are linear. (Single strain gauge load cells only have three wires instead of four.) Here we have used a hard plyboard for the frame for placing things over it and a light wooden board as Base. The wires are White Black Red and Green If there is any charges let me know. This circuit is designed for getting reading at serial terminal if you need to add display refer LCD interface with Arduino. 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. HX711 scale1(DOUT1, CLK1); But can’t I just use the B+ and B- spare on my current hx711? break; Are you using channel a or channel b, B is fixed amplification, A is programmable. I am working on my final year project in college and I chose this project topic. B = 30 kg // Put on load A // read the analog value showing (this is analogvalA) // put on load B // read the analog value B // Enter you own analog values here float loadA = 10; // kg int analogvalA = 200; // analog reading taken with load A on the load cell float loadB = 30; // kg int analogvalB = 600; // analog reading taken with load B on the load cell // Upload the sketch again, and confirm, that the kilo-reading from the serial output now is correct, using your known loads float analogValueAverage = 0; // How often do we do readings? GAIN = 2; Wait until the Reading message is displayed on the serial monitor and then place a specified weight item on the load cell. my bowl weighs 0.147 kg and the analog reading i got is 96. i created a variable and set it to 96 and then subtracted analogValueAverage = analogvalA - variable. Source Code for Interfacing HX711 Load Cell with Arduino: 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. Serial.println((scale.read())); // print a raw reading from the ADC channel A. I tried it but didn’t work and my Wemos D1 it seems like stopped working, only weird character showed at serial monitor. 1. If you are planning on using load sensors 1 you will need to obtain or purchase four units. Can you give me complete details. God Bless Us All :)). However, the sparkfun one is digital and gives better resolution (24 bit, though much lower due to noise in a realistic application) than an arduino in its default configuration (12 bit). Regards works great on a 20kg 4 wire LC.. how would I add an additional LC to my hx711? Browse our Blog. The large gains are needed to accommodate the small output signal from the sensor. First we are going to mount the load cell. how i plug my stuff: On-chip poweron-reset circuitry simplifies digital interface initialization. Load cells used in these applications comply with accuracy classes C3 to C6. float peso = scale.get_units(); // Here I get the same value shown in lcd but with only two decimals lcd.setCursor(12,0); Black -> E- SCK -> digital 2 Where do i see the output values after running the calibration and weighing codes. hey, i have the very same issue with my 50kg load cell (there is only 3 wires : black red and white ). char temp = Serial.read(); “Thanks for this Project. Once you find the calibration factor update it in below code. In this example A = 10 kg. Here the need of power supply for load cell and instrumentation amplifier solved by Arduino power pins. Simply connect Load cell wires to the HX711 module based on their color, then connect DAT (Data) pin to Arduino Analog pin A1 and connect CLK (Clock) pin to Arduin0 Analog pin A0, Put Vcc and Gnd supply from Arduino power source pins. Connect to the Arduino as indicated on the attached schematic. void loop() { We are interfacing 40Kg load cell to the arduino using HX711 Load cell amplifier module. The full-scale input voltage range is ±80mV, when 5V supply is used at the AVDD pin. Download the "HX711_ADC" library: Moreover, an LCD module of type LCM1602 IIC V1 is used to display the measured weight. This code gave me accuracy of less than +/- 3 grams on Precision grade C2 40Kg Load Cell. However, when I try to save the reading value in a variable, my value has only 2 decimals instead of 3 that is shown in the LCD. Press z,x,c,v to decrease calibration factor by 10,100,1000,10000 respectively. i first tried to check if the load cell work well and i have the good resistance values so the problem don’t come from that. // Step 1: Upload this sketch to your arduino board // You need two loads of well know weight. I don't know. And lastly (though there are many other less common load cell set ups), there is a strain gauge load cell, which is a mechanical element of which the force is being sensed by the deformation of a (or several) strain gauge(s) on the element. I'm a Amateur Radio Operator (KK4HFJ). Press a,s,d,f to increase calibration factor by 10,100,1000,10000 respectively It's important to select the correct load cell for the correct application. Instruments like load cells provide small signal values and need to be amplified for processing, so without additional electronics, these sensors cannot and should not be connected directly to an Arduino's I/O pins. } In this tutorial, it is shown how to utilize an Arduino Uno, a HX711 breakout board, and a load cell in order to measure weight. HX711 Module operates at 5V and communication is done using serial SDA and SCK pins. This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license). Does anyone have some example code for using 3 load cells to measure weight separately with 3 hx711 boards on an Arduino Mega? To increase the output of the load cell so that the Arduino can read it on an analog input, we will need a INA125P amplifier and a 10 ohm resistor. i am doing project on this i have small problem please help me regarding that. However, increased accuracy is needed with shop-counter scales or scales used in filling machines. This is just connection between LCD and Arduino, the connection between load cell and load cell amplifier to Arduino is shown in the previous section. if(millis() > time + timeBetweenReadings){ float load = analogToLoad(analogValueAverage); Serial.print("analogValue: ");Serial.println(analogValueAverage); Serial.print(" load: ");Serial.println(load,5); time = millis(); }} float analogToLoad(float analogval){ // using a custom map-function, because the standard arduino map function only uses int float load = mapfloat(analogval, analogvalA, analogvalB, … A max = 200g loadcell won't cope with 5 kg, the same way that a 20t won't cope with 5 kgs. hi , This assembly can be used with Arduino UNO, Mega R3 or similar boards. Channel B differential input has a fixed gain of 32. Arduino boards like the UNOha… Using VISA is still an option, there are some good arduino softwares out there that do print the output of HX711 to serial port, and you can edit the code to add a key to the printed string (e.g. what's the capacity of it? using GML692 Sensor example code, circuit, pinout library It's possible that load cell (4 wire?) With the HX711 and load cell together with the Arduino Nano, you can create a … Thanks. how do we code to store the value of weight we sensed using load cell and depending on that to send a message alert using gsm? About: Professionally, I'm an IT Engineer (Executive Level) and Electronics Tech. Accuracy class C3 load cells are widely used in machine construction as well. After programming and testing is it possible to use on LCD MODULE stand alone mode. For this program to run you need HX711 Library Download from here hx711-master. The following video shows the entire process for connecting the load cell to the amplifier board, then attaching the jumper wires to the amplifier board and connecting it to the Arduino MEGA2560. very nice, sir Fixture arrangement causes problem to base line scale. Onchip power supply regulator eliminates the need for an external supply regulator to provide analog power for the ADC and the sensor. Please guide me to how to change the codings if i want a output in a buzzer while weight is over than certain limit..? }. It will make my day. Question I need help ! long time = 0; // int timeBetweenReadings = 200; // We want a reading every 200 ms; void setup() {   Serial.begin(9600); } void loop() {   int analogValue = analogRead(0);   // running average - We smooth the readings a little bit   analogValueAverage = 0.99*analogValueAverage + 0.01*analogValue;   // Is it time to print? It doesn’t matter how much kg load cell is. http://arduinotronics.blogspot.com/2015/06/arduino-hx711-digital-scale.html. delay(500); Please help! Channel A differential input is designed to interface directly with a bridge sensor’s differential output. case 64: // channel A, gain factor 64 Averaging values will not solve this problem. Basically I’m a mechanical Engineer. Load cell which is an amplifier senses the weight and supplies an electrical analog voltage to HX711 Load Amplifier Module. Once you see the placed weight is same as shown weight note down calibration factor and use it in Final code for weight measurement. From the minds at http://arduinotronics.blogspot.com/, Since so many people were having problems with the INA125P, we now have a new and improved version that uses the Hx711 24bit ADC amplifier module. I needed a load cell, a Arduino, and an amplifier. Clock input is flexible. 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