Arduino Hx711 Weight Scale Interface 1 0 Software

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Also the ADC on the arduino is 10 bit which provides a maximum of 2^10 ie. 1024 readings compared to HX711 which is 24 bit ADC and easy to interface. HX711 Datasheet. The Hx711 uses SPI interface to communiacate to the Arduino. (Refer Data sheet for more info) More info on DfRobots. Connecting to Arduino. Connection is pretty simple.

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 opening up a bathroom scale and using the sensors available in it. It turned out after trying with the AD620 insrumentation amplifier that i was not getting linear results and the readings were not accurate so i decided to use HX711 instead. Also the code provided displays the weight in KG and can measure upto 120KGs.

I am publishing this instructable so it helps someone like me to make their project faster. So the sensor gives the analog voltage as an output to the arduino but the voltage level is too small to be detected by the adc of the arduino and needs to be amplified using instrumentation amplifiers like AD620 or INA125. Also the ADC on the arduino is 10 bit which provides a maximum of 2^10 ie.

1024 readings compared to HX711 which is 24 bit ADC and easy to interface. The Hx711 uses SPI interface to communiacate to the Arduino.

(Refer Data sheet for more info) More info on Connecting to Arduino Connection is pretty simple. Connect the wires from the load sensors E+ E- on the terminals of the sensor 2.

Connect the S+ and S- wires on the A+and A- terminals respectively. Connect Vcc and Gnd 4.

Connect the Dt terminal to A1 and Sck terminal to A0 (can be changed according to code). Hey guys, i'm doing a balance system with 4 balances to do a mass balance in a race car (a project of my university). I did all, but the balances display a wrong result.

I calibrated the system (individualy) but when i put a 5kg mass in the balance (used to calibration) all display the same value, but if i mount in the balances, one same more and one same less. I don't know what's happening, could it be the cables? (i need a long cable) I'm sorry for my bad english, i'm brazilian. Please Help me! I have made same kind of circuit but I am getting a problem in amplifying the voltage.

I have tried this with a 3 wired load sensor in which I am keeping 2 resistors on the breadboard and 2 wires (black and white) coming out of load sensor are connected to make a Wheatstone bridge and I am reading the value of voltage between red wire of load sensor and its other end in Wheatstone bridge. Now when I am applying force on load sensor then it's value are changing ( very minute change but still change I have to amplify that). Now my problem is I am able to amplify the value of the voltage but the change is so minute that it's amplification doesn't show up in comparison to the actual voltage. How should I go about it? I received always this error.

How can i solve this error? Thanks your reply ^ C: Users Kotesz Documents Arduino pontosabb_scale pontosabb_scale.ino: In function 'void setup()': pontosabb_scale:14: error: 'scale' was not declared in this scope Serial.println(scale.read()); // print a raw reading from the ADC ^ C: Users Kotesz Documents Arduino pontosabb_scale pontosabb_scale.ino: In function 'void loop()': pontosabb_scale:49: error: 'scale' was not declared in this scope Serial.print(scale.get_units(), 1); ^ exit status 1 'scale' was not declared in this scope. Hi ☺ You can find weight (or load) sensors here: or here: Firstly it depend of how much you are ready to invest into a load sensor! Then it is your choice to buy rather on a DIY website or elsewhere such as alibaba etc. Also use search engine, just type 'weight sensor 100kg' in the search box you will find tones of websites! Finally I highly recommand you to take car about the 'shape' of the sensor (because you have to fix it to something stable).

Have a nice day and tell us about your achievements; ).

Contents • • • • • • • • • • • • Introduction is based on HX711,which is a precision 24-bit analog-to-digital convertor designed for weigh scale and industrial control applications to interface directly with a bridge sensor.Compared with other chips, HX711 not only has a few basic function,also contains high integration,fast response,immunity,and other features.The chip lowedrs the cost of the electronic scale,at the same time,improving the performance and reliability. The input interface of this weight sensor module is used sensor interface,which is compatible with Arduino I/O port.The output adopts compact terminal that makes weight sensor module easier to connect the weight sensor.It's the best choose for electronic enthusiast to do some tiny home scale. The weight sensor module can be combined with weight sensor on the market. We also help you to pick a small range of weight sensor. Specification 24-Bit Analog-to-Digital Converter for Weight Scales (HX711) • Two selectable differential input channels • On-chip active low noise PGA with selectable gain of 32,64 and 128 • On-chip power supply regulator for load-cell and ADC analog power supply • On-chip oscillator requiring no external component with optional external crystal • On-chip power-on-rest • Simple digital control and serial interface: pin-driven controls, no programming needed • Selectable 10SPS or 80SPS output data rate • Simultaneous 50 and 60Hz supply rejection • Supply Voltage: 2.6V~5.5V • Current.