Questions tagged [load-cell]

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

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34 views

How to measurement dynamic weight 0.3 Kg to 20 Kg, 1% accuracy

my problem is: I want to make a dynamic measure of weight that can handle a range of scales between 0.3-20 Kg while we keep of accuracy at least 1% [in case of 0.3Kg - 3 grams]. Equipment: Arduino Uno ...
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35 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
68 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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35 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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1answer
43 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
33 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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65 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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17 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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46 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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110 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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48 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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31 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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65 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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35 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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28 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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22 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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85 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
125 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
66 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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230 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
81 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
55 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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127 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
102 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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49 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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43 views

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 ...
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1answer
114 views

Read data from strain-gauge Labjack, Arduino

I am working on a project where we have to record breathing data. For that we ordered a LabJack U3-LV along a with an amplifier (datasheet) and a belt which is some kind of strain gauge I think. We ...
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3answers
250 views

Bipolar signal used in differential ADC

I'm trying to find a way to convert a bipolar signal from a load cell (Futek) to an input for a differential ADC on a TIVA microcontroller(TI TM4C123GH6PM). The load cell's amplifier outputs a bipolar ...
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81 views

RaspberryPi: Load cells and HX711 amplifier

I've created an app that will read 10 weighing scales at the same time with separate values but since some wires are like 1 meter long, I get so much noises in the values. I just wanna know if what's ...
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3answers
449 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
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1answer
70 views

Drop test with load cell: longer impulse on load cell than optically

I have been performing a simple drop test on a load cell using a golf ball, recording the impact using a Phantom camera as well as collecting the data from the load cell. The problem arises when you ...
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1answer
24 views

How to select load sensor for specific application

I have a project based on weighting scale. On the internet I have seen multiple types of load cells such as shear beam, single beam, s-type, planner beam load cells etc. What type of load cell is best ...
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3answers
314 views

Load sensor ADC converter

Load sensor required external module HX711 (ADC converter 24bit for weight) for ADC converter. This module is then connected to the controller. If I have a controller with inbuilt 24bit ADC, then is ...
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1answer
49 views

Analog Sensor output signal accuracy and sensitivity

I have to decide between 2 load cell models. the only difference between the two is that the output on one is 2mV/V and the other is 3mV/V. Both are rated at 2.5klbs. Which one of them would be more ...
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1answer
91 views

Load cell series connection

I want to measure weight of 200kg using load cell. i have to use 4 load cell ( each capacity is 50kg). My question is : is this possible to increase the capacity of load cell from 50kg to 200kg by ...
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1answer
185 views

Instrumentation Amplifier - is it possible to have an output signal inverted, with respect to the supply voltage?

I'm doing some circuit design in order to translate a load cell input into the pedal input of a Logitech G27. What I want to achieve involves having a balanced state output as close to 5V from the ...
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1answer
261 views

hx711 values non-linear

I have an hx711 ADC module with 4 50kg load sensors wired in a wheatstone bridge (for a maximum load of 200kg). When I apply load to the sensors, the resulting values for increasing weights appear to ...
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1answer
90 views

Extending load cell wires

I've Googled but didn't find an answer. Is it problematic to extend load cell wires? I would like to have the 4 cells under the 4 corners of something (since the object rests on those 4 corners), but ...
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1answer
575 views

I used a compression load cell, a HX711 and a Raspberry and I get really terrible inconsistent readings, are these devices incompitable?

I wanted to create a 10-200 lbs scale using a FX1901-200 lbs load cell (https://www.digikey.ch/product-detail/en/te-connectivity-measurement-specialties/FX1901-0001-0200-L/223-1531-ND/5277314), a ...
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1answer
143 views

How is a load cell made? [closed]

Someone know how a common cheap 4-wire load cell is made? I'm referring at one that it is in the cheap Chinese scale, like this. In particular, using a multimeter, I would try to identify the ...
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1answer
456 views

Problem encountered while amplifying load cell signal with LM358

I have an S-type load cell to measure weight up to 100 Kg. Its datasheet mentions 3mV/V against full range and excitation voltage. When no weight is applied, the voltage is 9.9 mV (Excitation is 10 V)...
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2answers
1k views

Low Pass RC Filter for Load Cell

I have a load-cell setup with some noise that I would like to filter out. I have a vague understanding of low-pass RC filters. I have a strain gauge with 350 ohms of resistance (no load). How can I ...
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0answers
109 views

Wheatstone gauge factor calculation?WII load cell

Currently working with the WIIFIT or WIbalance load cell. For some reason everybody wants to work with these load cell. However, there are no actual datasheet of the load cell used in the device. ...
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2answers
382 views

Cheap load cell and ADS1232 strange oscillation

I'm using four of these load cells wired in parallel and connected to an ADS1232. Overall the device (scale) is working well, but I am seeing a strange signal over a period of a few minutes after I ...
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76 views

Remove Contactor Noise from Load Cell Reading

I have connected my ADS1231 with STM32F030R8T6 as shown in the attached image. I have given 3.3 V power to both micro controller and adc. I am connecting load cells and i am getting satisfactory ...
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1answer
331 views

Creep on a load cell

I am working with a 50kg load cell. In the datasheet(https://www.sparkfun.com/datasheets/Sensors/loadsensor.pdf), the creep is defined by (3min)%FS. What does it mean?
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1answer
342 views

Making 2 layer board, using ground pour when I already use ground plane?

I'm working on a project were we are making PCB for measuring weight with 24-bit ADC (AD7792), MCU and GSM module. Because those measurements are highly sensitive, we are considering AGND and DGND ...
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2answers
354 views

Load cell amplifier inverse voltage output

I'm making a load cell modification to my Logitech G29 brake pedal. The potentiometer on the existing pedal have inverse voltage so 5V is no brake applied and 0V is max brake applied. This is inverse ...
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2answers
310 views

What's the difference between consumer and industrial grade strain gauge adhesive? [closed]

Can I just use normal super glue and epoxy resin to attach a strain gauge?? What am I sacrificing by doing so? Also, how are load cells so cheap and what kind of adhesive / covering do they use?