Questions tagged [load-cell]

A load cell is a transducer which converts force into a measurable electrical output.

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37 views

How to change get positive value on my weighting Scale?

My weighting Scale is working fine when I keep weight after the start. But I am getting stuck when I keep weight before starting my weighing device. When I do this auto-calibrate with available weight....
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668 views

What kind of a sensor does a arcade punch (boxing) machine have?

I am working on a project, where I have to measure the pressure exerted by a punch. I am trying to understand how an arcade machine works, and see if I could replicate the same mechanism in my project....
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HX711 with RaspberryPi and python

I have been working to create a digital scale for IOT project, using HX711 ADC. The problem Since it is crucial to have wifi connection, I use Raspberry Pi, to control the scale. Everything works well,...
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43 views

AD7190 voltage reference

I'm using AD7190 with a 4-wire load cell to build a pressure acquisition board. From ADI reference design(CN0102), I understand that connect sense+- lines of a 6-wire load cell to the ref+- pin of ...
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61 views

MCP3561 Configuration registers resetting upon relay activation

I am looking for advice on how to solve a problem I'm encountering with my PCB project. The application involves reading a weight from a cluster of load cells and activating a relay that controls a ...
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1answer
38 views

Weight sensors? Load cells?

Apologies for a novice question. I'm looking into designing a system which would detect presence of certain objects on say a shelf. I think (not sure) I need to use "load cells" for that. Is ...
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122 views

Homemade NAU7802 breakout board not preforming like reference

I am designing an NAU7802 breakout PCB for a small weight scale project I'm working on, but I've had bad luck getting it working. I am comparing its performance with the Sparkfun Quiic Scale (their ...
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36 views

Use of a three wire load cell

I am currently doing a project which requires the measurement of forces on a surface and to achieve this we are using 3 wire load cells. The problem that I am running into is no matter how I orient ...
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HX711 and 50kg load cell - possible update speed / dynamic load

I bought this 50kg load cell and an hx711 which I want to connect to my raspberry pi zero. I'm wondering how accurate they are if I load them with a dynamic weight. To take a simple analogy: could I ...
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38 views

Effects of bootlace ferrules to connect load-cell with amplifier

My colleague and I had an argument about whether or not to use bootlace ferrules for a load-cell (4 stranded wires + 1 shield | 100mg precision | OIML C3 | max. 3kg) going into an amplifier (spring-...
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77 views

HX711 noise, but only in a specific environment

I'm working on a small project at my farm to automate vegetable weighting. The system consists of an STM32 MCU, some additional ICs (matrix decoder, parallel-serial converter for some push-buttons etc....
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1answer
71 views

Suitable op-amp and voltage regulator for 16-bit ADC

I would like to use the AD4008 16-bit ADC from Analog Devices to sample a load cell. I also need a linear regulator and driver amplifier and instrumentation amplifier. I am curious to know if these ...
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58 views

Reduce load cell creep and drift programatically

I am trying to build a weigh scale and have read through the parameters that affect its reading in the long run. My question is can we reduce the Creep and drift of the load cell by compensation ...
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1answer
80 views

What does %FS (Full Scale) represent in load cell?

Lets say that a load cell has these specifications: Rated Load = 500 g Rated output = 1 mV/V Excitation voltage = 12 V Creep = 0.02 %FS / min Then the output range should be 0--12 mV. Does %FS mean ...
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1answer
61 views

Why aluminium for load cells?

I am currently working with load cells for weighing small masses. Almost all of them, as far as I have looked, have been made from aluminium. Given that repeatability is critical, why aluminium and ...
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52 views

Linearizing a load cell

As I understand it most load cells (all?) are only approximately linear. To improve the linearity would a 3 point calibration be sufficient? For example, at no load, half load and maximum load. If so, ...
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49 views

How to determine if a load cell is quarter-bridge, half-bridge or full-bridge?

Im looking to purchase 4 disk type load cells for weighing applications but it doesn't mention what configuration it is in (quarter bridge, half bridge etc.) Is it safe to assume 2 wire load cells = ...
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613 views

Load Cell ADC HX711 Alternatives?

Looking for an HX711 ADC alternative. Sparkfun sells a pricey breakout board with the chip, but I cannot source the IC anywhere online for some reason 🤷‍♂️. Are there any ADCs out there that have a ...
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32 views

Load Cell Decreasing Output

I built the following weight system using a Load Cell and Hx711. I am using an Arduino UNO and running the calibration sketch in HX711 library. However, I noted one interesting behavior that you ...
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1answer
85 views

Regarding PLC and several input/ output modules

I have to use more than 40 servo motors and 20+ load cells using PLC. But the problem is that I have to use many I/o modules ( that is costly and hectic). Can I reduce the no of I/o modules by any ...
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286 views

How to connect two load cells to one HX711?

I have two 5 kg load cells and one HX711. The project's goal is to connect them together, and measure the weight of the same object. I would like to get the average in order to make my calculations ...
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2answers
175 views

How does the HX711 circuit work?

This scheme will be designed for weight scales. Why is there a transistor installed. And I want to understand why need capacitors and resistors in this circuit. (their purpose) The documentation does ...
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1answer
363 views

HX711 chip not working

I'm working on an electronic weight scale using MSP430 and I need your help: I've written the code using Energia and I've used the HX711 module for testing and everything works just fine. The final ...
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1answer
102 views

Can I “sum” internal ADC channels to achieve extra bits resolution?

First of all I am a newbie in electronics. I am building some weight scale applications using (as seen everywhere) load cells wired to a HX711 ADC and a ESP8266. I am now giving a try to the Texas ...
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1answer
167 views

How to measure multiple objects' weights with load cells and Raspberry Pi 4?

I am working on a class project that involves a raspberry pi and strain gauge load cells. . The goal is to measure the weight of two or more objects using a set of two load cells (In the picture it ...
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1answer
114 views

What would cause an ADC to stick on an arbitrary value?

I have a differential ADC (HX710) that I am using to interface a load cell. The wiring is as follows with (J4) going to the load cell: Mostly, this reads very reliably and accurately. However, ...
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318 views

Load cell continually increases or decreases

I am using a load cell that is wired to a HX711 amp in the following manner: . I have been attempting to use the calibration example code that is included in the HX711_ADC library (code listed bellow)...
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358 views

3 wire load cell and HX711 weight compensation

in my project I use 3 wire load cell (like this (3wire 50kg) but mine are purchased from ebay) and HX711 for weighing. My wiring is like this (but i use Arduino mini pro 3V3): Apparently it should ...
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2answers
54 views

What is the nuance between these electrical parameters in this load cell datasheet?

A load cell has the following specs: I've highlighted the relevant part in yellow. There are two parameters called Uref and Bu. Both of them is about the excitation voltage for the Wheatstone bridge ...
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586 views

Is AD7794 a good alternative to Hx711 for multi-channel ADC?

note: Electronics isn't my main background so I might make silly mistakes. I did read the datasheet but don't understand all the terms despite my effort. Suggestions are welcome. AD7794 (datasheet) ...
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36 views

Input impedance of load cell CZL635 seems wrong

I'm working with load cell Phidget CZL635 and HX711 ADC in order to make a weight scale. Load cell: https://www.gotronic.fr/pj-461.pdf ADC: https://pdf1.alldatasheet.com/datasheet-pdf/view/1132222/...
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48 views

Load cell behaving weirdly. Output magnitude of force depends on which side is held and which side force is applied

also asked at: https://forum.arduino.cc/index.php?topic=670246.0 I have a generic load cell (image) and am using Hx711 which is connected to arduino. The code is from Instructables. When I fix and ...
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975 views

Connecting 4 load cells in parallel

I have 4 strain gauge load cell to calaculate actual weight.I want to use summing method for 4 output signals. I searched at internet for summing box schematic I found this pic Now if V1 , V2 , V3 , ...
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71 views

Use a precision opamps or instrumentation amplifier for load cell application

I'm making a low power weighing scale with good precision. I'm contemplating if it'll be better to build a instrumentation amplifier with discrete OPAMPs of LPV821 which is low power (Iq 650 nA), high ...
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38 views

Load cell amplification circuit operation

Here's the reference circuit for amplifying the signal from a load cell with precision OPAMPs as per the MAX44248 datasheet. Can this OPAMP circuitry be explained please. What's the relation between ...
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154 views

Loadcell strain gauge with 10 V excitation

I am designing loadcell (spec) measuring using 24-bit adc (MCP3561) with excitation 10 V. But I couldn't find the reference design for 6-wire loadcell that its sense pins connect to ref+ pin of ADC. ...
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65 views

Two load cells on one HX711

I need to read 4 full-bridge load cells about 10 times per second. Are there any drawbacks of connecting two cells to A and B channels of HX711 and alternating reading between them? I understand that ...
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37 views

Raspberry pi not getting any data from hx711

I'm trying to combine two boards into one: SparkFun Load Sensor Combinator(basically just a wheatstone bridge) and SparkFun Load Cell Amplifier. The data will be transmitted to a Raspberry Pi 3 so ...
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28 views

why is the reference of strain gauge changed depending on gains of amp? use ina128 and ad8542

I made a circuit for a load cell. It is available but when it is applied to the strain gauge, it has a problem. Reference voltage : 1.65 V When I measured value of load cell, I can see the change ...
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123 views

ADC value changes with changing power supply

I'm measuring weight using hx711 ADC and load cell. HX711 schmatic: I use 12V 1A power supply and 6V/4Ah dry cell. Also I use MT3608 boost converter to increase battery voltage to 12V because ...
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2answers
328 views

HX711 and 3 load cells

I am doing a small project with ESP32 and HX711 and I need to have 3 load cells. Like this one: I am totally newbie in electronics, my ground is programming. What I found are projects with 1, 2 or ...
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1answer
126 views

Reading and interpreting output sensitivity of a load cell from data sheet

I'm given these ratings /spec for load cell / sensor: Range: 0-200kg Output sensitivity: 0.7 ± 0.15mV / V Nonlinear: 0.05% F.S Hysteresis: 0.05% F.S Repeatability: 0.05% F.S Creep: 0.05% F.S/3min ...
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730 views

Drift in output voltage of load cell

I used one of these scales and after a few months the reading started drifting up: after hitting tare to get to zero, the reading would show 2 grams, then slowly go up to 10 g in one minute. I ...
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1answer
91 views

Weird component in load cell Wheatstone bridge

While trying to repair a cheap digital kitchen scale, I came across this component (see picture below). AFAICT, this is 95% identical to the standard Wheatstone bridge interconnect for combining 4 ...
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1answer
60 views

µC control of a force testing machine

At work we have a machine that is used for testing and calibrating force sensors. It basically consists of a huge lever that is actuated by an electric motor with a gear reduction and a calibrated ...
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209 views

AD7730 calibration failure

EDIT: The exact issue is this, the ADC has a gain register (set during internal FS calibration and again at System FS calibration) and an offset register set during system zero calibration. The ...
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1answer
210 views

Load cell accuracy: rated output vs. full scale

I'm currently shopping for some subminature load cells for a research project. I've narrowed it down to two options, the FUTEK LCM100 and the Burster Model 8417. Problem is the two specify their ...
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4answers
2k views

Build a scale without computer

I need to build a scale that is not attached to any computer. The goal is to weigh a dustbin and show the weight value on a small LCD screen. The weight I want to measure is approximately 10 kg, but I ...
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2answers
55 views

Load Cell Amplifier

I'm not from an electrical background and looking for possible options to amplify the load cell output. I'm using the following loadcell with a 2 mV/V output. http://www.sentranllc.com/pub/...
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How would I hook up this load cell to work with an HX711 amplifier?

I’m trying to build a scale using this load cell which is different than the similar looking load cells in that it these are rated for 100kg, whereas the typical load cells are rated for 50kg. More ...