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Questions tagged [load-cell]

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

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20 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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19 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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51 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
55 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
41 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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98 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
73 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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91 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
56 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
44 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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30 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
100 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
178 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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70 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
314 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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54 views

FX1901 force sensor connection to Raspberry Pi

Has anyone connected an FX1901 force sensor to a Raspberry Pi (with a HX711)? Is this possible? I am pretty new to this topic and didn't find sufficient explanation.
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1answer
51 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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0answers
31 views

ADC sensing Range of MSP430I2020 controller

my project is based on Weight scaling using load cell. currently, I'm working on inbuilt 24 bit ADC of msp430i2020 controller.internal ADC reference voltage is 1.2 volt. Capacity of load cell -300KG ...
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54 views

Arduino with 2 load cells (3 wires)

I'm new with load cells, and I have problem with my project, using 2 load cells with 3 wires is hard to get reference, many people using 4 load cells with 3 wires or using 4 wires load cells, can you ...
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1answer
23 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
245 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
37 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
71 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
142 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
183 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
69 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
442 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
135 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
330 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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0answers
87 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
342 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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72 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
285 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
299 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
238 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
263 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?
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1answer
154 views

How to rationalize load cell readings

I am working on a project for development of load cell amplifier circuit. I want to rationalize the output of the load cell to fix counts like 20000 counts at full range capacity. I have 5 Kg load ...
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1answer
275 views

Can I use any GPIO pins on the Raspberry Pi for the HX711 Amplifier?

We're going to use an HX711 amplifier to read data from a strain gauge - the SparkFun page says you can use any GPIO pins but it one is "clock" and one is "data." What does that mean in this case? ...
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1answer
548 views

4 full bridge load-cells with the HX711

I'm trying to hook up the load cells from a Wii fit balance board to an esp8266 using the HX711 ADC. Ideally, a way using only one HX711 but, a hookup guide for two HX711 with two load cells apiece ...
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0answers
444 views

How to connect bathroom scale (arduino+hx711+spark load connector)

Im a new user in the electronic world. I tried to hack my bathroom weight scale but no success. There is a great tutorial which I followed: https://www.youtube.com/watch?v=iywsJB-T-mU my parts: ...
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1answer
79 views

KL43Z Load Cell with INA 125P

I'm trying to use a Load cell with the INA 125P amplifier with my FRDM KL-43Z board. Currently, I have it connected like so with the Arduino being replaced with the KL43Z analog input (...
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1answer
107 views

Total Weight for load cell when connected in a wheat stone pattern?

I have 4 load cells from AnyLoad, Model 563YH-SE5Klb. Each Load cell is 5Klb and i want to connect them in a wheat stone bridge format. My surface area for the load is 3 feet by 5 feet, and thats why ...
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1answer
125 views

How to measure weight at end of arm

I have a setup where I need to measure the weight at the end of an arm. The arm is clamped between two pieces of aluminum at one end. The Sensor S is mounted a short distance (5cm?) from the aluminum ...
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3answers
81 views

Measuring ripple voltage using on-board components. Is it possible?

I am designing a circuit with a very sensitive analog part. In order to eliminate SMPS noise from a regular power supply, the device has its own non-SMPS power supply followed by an ultra low noise ...
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1answer
837 views

HX711 always read same value

I'm trying to use a www.sparkfun.com/products/13879 with one 3 wires load cell I gathered from an old scale, so I reproduced this schematic. However the reading is always the same. I use the code from ...
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1answer
2k views

Load cell temperature compensation

Can someone explain to me how this (as advertised) full bridge load cell works? I'm aiming for good temperature stability and I understood a full bridge load cell configuration should reject error ...
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1answer
242 views

TrackPoint a.k.a pointing stick 2-axis force sensor

I have an application that would benefit from a sensitive two-axis force or bending torque measurement very much like what a pointing stick (a.k.a. TrackPoint) used to do in a ThinkPad, apparently ...
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1answer
46 views

usual unloaded load cell diagonal voltage?

I found a load cell and wonder if its working or damaged since the diagonal voltage is not zero with no load on it. The diagonal voltage is about two volts when I supply 5 volts. There are no stickers ...