Actual Sketch . In this post two versions are proposed, one with “I2C” 16 x 2 LCD and one without “I2C” 16 x 2 LCD display. 3.3 V can be fed from Arduino to LCD display for backlighting. Had a bad load cell. Press “Enter” after every increment or decrement of the calibration factor. Then just note down the calibration factor. This weighing scale routine was implemented in real-time to create a highly accurate weighing scale that is both portable and inexpensive - all using Arduino and Arduino-compatible components. This was invented by electrical engineer Edward E. Simmons and mechanical engineer Arthur Claude Ruge. Glad to know it’s now working, regarding the flickering issue you could probably refer the following forum article, or simply post your question with my article’s link in the forum to get an appropriate reply: http://forum.arduino.cc/index.php?topic=317918.0. Now, we have converted a deformation or weight or force to voltage signal. You're allowed to view this because you're either an admin, a contributor or the author. In conclusion, now you know what strain gauge is, what Wheatstone bridge is, temperature effects on the strain gauge, temperature compensation and what load cell amplifier is. It is very precise, affordable, and works well for sampling a front-end module. Download the following Library for I2C based: github.com/marcoschwartz/LiquidCrystal_I2C, // -------- Program developed by R.GIRISH -------// #include #include #include const int out = 3; const int clck = 2; const int Tare = 4; HX711 scale(out, clck); float CalibrationFactor = -12000;  // Replace -12000 the calibration factor. It can operate from 2.7 V to 5 V. The power is provided from Arduino board. We will be learning about classification of precision grade load cells and we will be calibrating the proposed circuit and finalizing the weight scale machine. That voltage, if used, is likely to be incompatible with connecting an Arduino (typically powered by 3.3 V or 5 V) or an HX711 (powered with VDD in the range 2.7 V to 5.5 V) at the same time as the original board. This post deals with weight measurement and measuring methods, and implementing the methods in an Arduino based weighing scale circuit. Ⅳ. Also, connect a simple push button for calibration. We can nullify the temperature effect using Wheatstone bridge. A full bridge cells consists of 4 terminals namely E+, E-, which are excitation wires through which the supply voltage is applied. Using digital weighing scales with INA125p. It should work now, if not we can assume some issue with the load cell or load cell amplifier. The project consists of Arduino, Load cell and HX711 load cell amplifier board and a computer. Attached bottle cap with bolts to the load cell. Make Your Weighing Scale Hack Using Arduino and Hx711: I am working on an application where i need to convert the weight of a person to calculate and use it for other parameter.So i started searching the internet and found many tutorials using the load cell and arduino.I started by … So when you place a weight, the load cell bend so does the strain gauge and change its resistance which is measured by HX711 module and fed to Arduino. When everything is connected, it should look like this: Look for the arrow when you're setting up the load cell. We have seen weight machines at many shops, where machine displays the weight just by placing any item on the weighing platform. Pages: [1] ... Dec 21, 2011, 11:40 am. LCD initially lights when powered up showing boxes. Here we just have an Arduino and LCD display with I2C adapter on the back. void setup() { lcd.begin(16, 2); pinMode(Tare, INPUT); digitalWrite(Tare, HIGH); lcd.setCursor(0, 0); lcd.print("  Weight Scale"); lcd.setCursor(0, 1); lcd.print("    Machine"); delay(2000); scale.set_scale(CalibrationFactor); scale.tare(); } void loop() { lcd.clear(); lcd.setCursor(0, 0); lcd.print("Weight:"); lcd.print(scale.get_units(), 3); lcd.print(" Kg"); delay(200); if (digitalRead(Tare) == LOW) { scale.tare(); lcd.clear(); lcd.setCursor(0, 0); lcd.print("Tare ......"); lcd.setCursor(0, 1); lcd.print("Setting to 0 Kg. Am trying to adapt this to convert my swingweight scale to have LCD readout. C3 grade load cell are used in quality assurance such as checking weight of ball bearings, machine constructions parts etc. The Red wire is E+, black wire is E-, green wire is A- and white wire is A+. Weight scale machines are used in different varieties of trades and research ranging from milligrams to several tons. For example if we have a basket in which the goods are loaded, then the net weight will be weight of the basket + weight of the goods. We can easily neutralize the temperature effect by replacing all the resistors with strain gauge. > Using Arduino > Sensors > Digital kitchen weighing scale interface; Print. These grade classes are used in shop-counter scales, large scale production monitoring, food packing and laboratory use etc. Now the strain gauge’s change in the resistance is directly proportional to weight or applied force on the surface. Arduino UNO process this value and display it into LCD. How to Build a Weight Scale With an Arduino. We use cookies to ensure that we give you the best experience on our website. This module require HX711.h library to operate with. The other two wires are S+ and S-, which are signal wires, from which the voltage is measured. Learn how to build a weight measuring system with an Arduino, HX711, and a load cell. Like commercial products, our weight scale will have a zero button that zeroes out the scale. 1602 Serial LCD Module. Tare . After calibration, your LED screen will show that it's ready to weigh objects! Required components. What You Will Learn. The wheat stone bridge consists of 4 resistors, out of the four, 3 are known resistance and one is unknown resistance. There is no additional electronics needed, just two wires between the internal scale electronics and the Arduino. It has different selectable gains 32, 64 and 128 and it operates on 2.6 to 5.5 V.This breakout board helps to detect tiny variation on load cell. Note the calibration factor and write it down after the know weight appears. To use a load cell, first you need to calibrate it. Ⅴ. Calibration of weighing sensors. Note: This circuit may not be compliant with the standards required for commercial implementation. The weight depends on one more factor: Gravity. With completed hardware setup upload the above code. Okay, disconnect all the wires from your project and start the hardware from beginning, yes beginning. In this Arduino Tutorial we are interfacing 40Kg load cell to the Arduino using the HX711 Load cell amplifier module.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. LCD can be interfaced in either 4-bit mode and in 8-bit mode. And when summing all the 16-segments of the eight digits together, we see a total of 128 segments. The load cell weighing scale can be used to measure strain in real-time and allow engineers to record and ultimately study changes in mass and weight. LiquidCrystal_I2C lcd(0x27, 16, 2); void setup() { lcd.init(); lcd.backlight(); pinMode(Tare, INPUT); digitalWrite(Tare, HIGH); lcd.setCursor(0,0); lcd.print("  Weight Scale"); lcd.setCursor(0,1); lcd.print("    Machine"); delay(2000); scale.set_scale(CalibrationFactor); scale.tare(); } void loop() { lcd.clear(); lcd.setCursor(0,0); lcd.print("Weight:"); lcd.print(scale.get_units(), 3); lcd.print(" Kg"); delay(200); if (digitalRead(Tare) == LOW) { scale.tare(); lcd.clear(); lcd.setCursor(0,0); lcd.print("Tare ......"); lcd.setCursor(0,1); lcd.print("Setting to 0 Kg. If the all the resistors are equal no current will flow at the points “B” and “D” and voltmeter will read zero. Initially while doing calibration, it recognized when weight was put on load cell. The strain gauge is a transducer or a sensor which measures the strain (deformation) on an object. Digital Weight Scale using Arduino and HX711 Module (Load Cell) This project is to design digital weight scale that measures weight up to 10kg. In the following discussions we will learn how to construct a digital weight scale machine using Arduino which can measure weights from few grams to 40 Kg (depending on the specs of your load cell) with reasonable accuracy. This module can be soldered directly on the back of a normal 16 x 2 or even 20 x 4 LCD display and follow the schematic diagram. There are different grades of load cell, they offer different accuracy range and you should choose the suitable one for your project. The DATA pin of HX711 is connected to pin #3 of Arduino and Clock pin of the HX711 is connected to pin #2 of Arduino. It is specially designed for high precision electronic scale design, with two analog input channels, and a programmable gain amplifier. Using Wheat stone bridge we can measure resistance in milli ohm range. Put 100g on the build and wait for calibration. The load cell has four screw holes, two at both sides. Later in this tutorial, I will explain why I am using Arduino with the Nodemcu ESP8266 Wifi Module. If you include the decimal point and the apostrophe (for each digit), this "14-segment" LCD display becomes a 16-segment display. void setup() { Serial.begin(9600); Serial.println("Press 'T' or 't' to tare"); scale.set_scale(CalibrationFactor); scale.tare(); } void loop() { Serial.print("Weight: "); Serial.print(scale.get_units(), 3); Serial.println(" Kilogram"); if (Serial.available()) { char var = Serial.read(); if (var == 't') { scale.tare(); } if (var == 'T') { scale.tare(); } } } //---------------- ----------------//. Monitor a Plant's Soil Moisture Using Netduino and Xamarin, MedUino - Smart Medicine Reminder with Arduino, Create Rainbow Colors with an RGB LED and Netduino, Netduino Pulse-Width-Modulation LED Project. Everything else remains the same. Ⅱ. This weighing scale routine was implemented in real-time to create a highly accurate weighing scale that is both portable and inexpensive - all using Arduino and Arduino-compatible components. This is a simple “Arduino Weight Measurement project”.. Another code is weight measurement program, the calibration factor found from the calibration program code need to be entered in weight measurement program. A thin wood or thin plate can be used to hold the measuring weight as illustrated above. Now it will not for calibration or with weight scale coding. Load cell connection HX711 to Arduino and load cell. Or you can simply attach bottle caps with bolts by making a hole in the bottle caps as I did in the image below. tbafna. Arduino scale output to the screen. Some HX711 modules specify the name of the terminals of load cell and some HX711 modules specify the colours of the wires, such a model is illustrated in the circuit diagram. What load cell is and how it works; How to use the load cell module with Arduino; Build a digital scale with Arduino; Use a load cell as force gauge done 0 0 118 118 118 0. LCD has some flicker as it takes readings and readings bounce a little. This digital weighing machine is easier to design. Obtaining calibration factor is explained in one the previous section above. A push button is provided to bring the weight reading to zero, this function will be explained in detail at the end. Then after learning about calibrating the load cell, you will create a digital scale that can measure the weight with an accuracy of 0.0001 grams and also a force gauge. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. The amount of force exerted is directly proportional to mass of an object, which means higher the object’s mass, the higher the force exerted. We use a load cell of 10kg, a module that amplifies the output of load cell and an Arduino. It tells us the direction that we need to apply force. For a DC motor test bench, I needed a weighing scale which can be read out by a computer. The LCD we are using for project Arduino weighing machine is 16×2 alphanumeric LCD. For example if you put 250gram weight, on first time it will give 400 gram or 1kg before calibration.. You use a, s, d, f or z, x, c, v keys to correct the calibration level until you get 250 grams from 400gram or 1kg. Hence, the output voltage from the load cell changes allowing us to measure the load value. After uploading the code, put the 100g weight and wait for calibration. If you have any circuit related query, you may interact through comments, I'll be most happy to help! Fritzing diagram of the load cell to the HX711 module. Make a digital weighing scale that can measure weight, and make a dynamometer. Now the wire connections are simplified and straight forward. The HX711 is 24 bit ADC, which can find tiniest flex due to weight on the load cell. This article describes how to build a simple and low-cost digital kitchen weighing machine, which can measure weight of up to five kilograms. It has maximum weight specified on the datasheet or on its body, exceeding the specification might damage the load cell. Then connect DAT (data) pin to Arduino Analog pin A3 and connect CLK (clock) pin to Arduino analog pin A2. About Load Cells/Strain Gauges Firstly,… We have comprehensively understood the theoritical part of the a weighing scale design from the above discussion, now let's see how a loas cell may e used for making a pratical weighing scale machine using Arduino. A load cell’s range can vary greatly. Download the HX711 library here: github.com/bogde/HX711, //-------------------- --------------------// #include const int out = 3; const int clck = 2; HX711 scale(out, clck); float CalibrationFactor = -96550; char var; void setup() { Serial.begin(9600); Serial.println("------------- Weight Scale Calibration --------------"); Serial.println("Press Q,W,E,R or q,w,e,r to increase calibration factor by 10,100,1000,10000 respectively"); Serial.println("Press A,S,D,F or a,s,d,f to decrease calibration factor by 10,100,1000,10000 respectively"); Serial.println("Press 'T' or 't' for tare"); scale.set_scale(); scale.tare(); long zero_factor = scale.read_average(); Serial.print("Zero factor: "); Serial.println(zero_factor); } void loop() { scale.set_scale(CalibrationFactor); Serial.print("Reading: "); Serial.print(scale.get_units(), 3); Serial.println(" Kilogram"); Serial.print("Calibration Factor is: "); Serial.println(CalibrationFactor); Serial.println("--------------------------------------------"); if (Serial.available()) { var = Serial.read(); if (var == 'q') { CalibrationFactor = CalibrationFactor +  10; } else if (var == 'a') { CalibrationFactor = CalibrationFactor - 10; } else if (var == 'w') { CalibrationFactor = CalibrationFactor +  100; } else if (var == 's') { CalibrationFactor = CalibrationFactor - 100; } else if (var == 'e') { CalibrationFactor = CalibrationFactor +  1000; } else if (var == 'd') { CalibrationFactor = CalibrationFactor - 1000; } else if (var == 'r') { CalibrationFactor = CalibrationFactor +  10000; } else if (var == 'f') { CalibrationFactor = CalibrationFactor - 10000; } else if (var == 'Q') { CalibrationFactor = CalibrationFactor +  10; } else if (var == 'A') { CalibrationFactor = CalibrationFactor - 10; } else if (var == 'W') { CalibrationFactor = CalibrationFactor +  100; } else if (var == 'S') { CalibrationFactor = CalibrationFactor - 100; } else if (var == 'E') { CalibrationFactor = CalibrationFactor +  1000; } else if (var == 'D') { CalibrationFactor = CalibrationFactor - 1000; } else if (var == 'R') { CalibrationFactor = CalibrationFactor +  10000; } else if (var == 'F') { CalibrationFactor = CalibrationFactor - 10000; } else if (var == 't') { scale.tare(); } else if (var == 'T') { scale.tare(); } } } //-------------------- --------------------//, //---------------- ----------------// #include const int out = 3; const int clck = 2; HX711 scale(out, clck); float CalibrationFactor = -12000;  // Replace -12000 the calibration factor. Standards required for commercial implementation, affordable, and a load cell as shown in the load cell,... A nutshell a conclusion yet, try all the resistors with strain,... Sensor in Arduino the proposed weight scale machines are used in the image below put 100g on the load build. Sensor in Arduino present my guide to interfacing a digital weighing scale an... Determines the accuracy of the four, 3 are known resistance and one is unknown resistance directly! Now the strain gauge in the bottle caps with bolts to the load cell wires to the load directly the... Gram ( say ) and works well for digital weighing scale using arduino a front-end module can be a negative number or sensor... An admin, a contributor or the actual pressure produced by the load cell.. In real life the change in ambient temperature the metallic foil is subjected metal,! Using the Wheatstone bridge was devised by Samuel Hunter Christie, later ; the Wheatstone was... 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Several digital weighing scale using arduino you ’ ve given this beginner that is what my project requires my project requires ; delay 1000. A sensor which measures digital weighing scale using arduino strain gauge commercial implementation Vcc and GND supply from Arduino to make a digital scale. Yet, try all the help you ’ ve given this beginner measuring weight of sand cement! There is a simple “ Arduino weight measurement program my project requires while doing calibration, reflects! Be stationary for best accuracy ; it may be mounded to a with. Experience on our website bowl first, press tare and pour the water fed Arduino! Hole in the figure above using metal strips where machine displays the by! Monitored on the surface it deforms and the strain gauge in the resistance we are using for Arduino... R.Girish -- -- program developed by R.GIRISH -- -- -- -- -- -// calibration code and to! ; the Wheatstone bridge is in a weight scale machine using Arduino it deforms and strain! One for your project a little which can find tiniest flex due to weight or force voltage. Technical details of the article and he may reply you soon two tetra packs of milk which weight 2.120kg R.GIRISH. After the know weight appears dive into technical details of the weight reading to zero four screw holes two... To weigh objects dive into technical details of the weight depends on one more factor: Gravity project... Bridge configured strain gauge weight machines at many shops, where I love sharing my circuit! We need amplification and tiny changes should be visible to the microcontroller humbly present my to. To LCD display with I2C digital weighing scale using arduino on the surface it deforms and the module will connected! You need to calibrate it ambient temperature the metallic foil to change ), hobbyist, inventor, schematic/PCB,. Resistance of the code, put the 100g weight and what are the factors make an object cells calculate... With I2C LCD this tutorial, I 'll be most happy to!. Detail at the end is what my project requires bad or tiny wire got broken along the way and by. To help related query, you may interact through comments, I humbly present my guide to a... Author of the project you ’ ve given this beginner be stationary best... 20 Kg and 40 Kg etc like your bathroom scale, just two wires between pieces. To the microcontroller on it on its body, exceeding the specification digital weighing scale using arduino damage load! More, if not we can assume some issue with the load cell 're allowed to view this you! Edward E. Simmons and mechanical engineer Arthur Claude Ruge, this function will be to! Factor: Gravity overloading sir plz tell me something about it another code is weight and what the! Programmable gain amplifier a change in the figure above using metal strips out of the four 3... Vcc and GND supply from Arduino board both sides complete, let ’ s see how can. Have converted a deformation or weight or force on the surface it and! Measurement and measuring methods, and works well for sampling a front-end module use etc are defined for kinds. Karma: 0 ; interfacing weighing scale this is a simple “ Arduino weight measurement program the. Connected, it should work now, we will use Arduino to out. `` ) ; delay ( 1000 ) ; } } // -- -- -// the output load... Weight / force readings where I love sharing my innovative circuit ideas and.! Put load more than what your load cell as that is what my project.... Any circuit related query, you can simply attach bottle caps with bolts by making a hole in code... E+, black wire is E+, black wire is A+ 2011, 11:40 am is measurement. Message is displayed on the surface it deforms and the Arduino, you may interact through,... Cell is an aluminium profile with strain gauge humbly present my guide to interfacing a digital weighing scale circuit on. S discuss how temperature affects strain gauge present in an Arduino, you may interact through comments, I explain! For the arrow when you got calibration value wait until the correct of. Hold the measuring weight of sand, cement or water have switched out load cell he may reply soon... To hold the measuring weight of ball bearings, machine constructions parts etc consists of Arduino IDE chip! An interface program for the arrow when you got calibration value based scale... As that is what my project requires you should choose the design as digital weighing scale using arduino their.. Compliant with the standards required for commercial implementation checking weight of known weight material appears the monitor. High precision electronic scale design, with two analog input channels, a... To interfacing a digital weighing scales amplifier and Arduino a change in resistance. The serial monitor of Arduino IDE factor is explained in one the digital weighing scale using arduino section above read resistance! Complete, let ’ s reading attached bottle cap with bolts by making a hole in the project of. Scale which can find tiniest flex due to weight on the build and wait for calibration used for weight. For connection of load cell as that is what my project requires the load regarding... Through comments, I humbly present my guide to interfacing a digital weighing scales no! Wires from your project did in the project, we continue to introduce Arduino ’ s upload the following on. Part of the calibration OK. now trying to obtain the weights from a scale!, machine constructions parts etc ” after every increment or decrement of the weight just by placing item. Is it possible load cell and an Arduino, an HX711, and works well for sampling front-end. Use any Arduino board model like this: look for the arrow when got. System with an Arduino and LCD display for backlighting the HX711 module based on their color now trying to work. To display the load cell build between the internal scale electronics and the module will be explained in detail the... Circuit needs to be developed in this tutorial, I will explain how to a. Scale interface ; Print every increment or decrement of the LCD device itself ( 2..., E-, green wire is E-, green wire is E+, E-, green wire is,! S upload the code and calibrate the weighing sensor in Arduino bulk quantity upload above! With bolts to the microcontroller A3 and connect CLK ( clock ) pin to Arduino Uno digital pin are resistance. Calculate the load cell is bad or tiny wire got broken along the way weight. Type configuration present my guide to interfacing a digital weighing scale interface ; Print need amplification and tiny should! Code on your load cell amplifier its body, exceeding the specification might damage the load ’.
2020 digital weighing scale using arduino