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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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62 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
82 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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22 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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2answers
81 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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34 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
37 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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25 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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31 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
22 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
92 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
23 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
44 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
80 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
84 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
47 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
196 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
124 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
182 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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49 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
188 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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0answers
65 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
204 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
203 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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1answer
113 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
164 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
118 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
186 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
440 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
335 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
72 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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0answers
78 views

Setup for a single 3 wire strain gauge

All, I am trying to set up a single 50kg 3 wire strain gauge (from Amazon) to a HX711 (also from Amazonenter link description here). I'd like to only use one of these gauges as I do not require the ...
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1answer
92 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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0answers
57 views

Simulate a loadcell with the Beaglebone green

With a voltage divider, I want to read the excitation voltage of a load cell connector (4 wires) and simulate the load on the load cell. For what I found, I can use a PWM signal with a simple filter ...
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1answer
83 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
76 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
601 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
1k 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
177 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
44 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 ...
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1answer
891 views

Connect load cell to hx711

I have a 50 kg load cell and an HX711 sensor (as in the image below), my problem is that in all the tutorials I've seen people use load cells with 4 output wires or 2 cells with 3 output cables, I ...
4
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1answer
384 views

Difficulties reverse engineering a digital bathroom scale

I apologize if this has been discussed elsewhere and for the length of the post. This is a group project and we plan to take the weight value from the scale and send it via a WiFi connection to ...
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0answers
79 views

Why do we need voltage stabilizion in bridge measuring system with ratiometric connection?

i found in many weight scale reference designs that they use either low noise linear regulator or voltage reference for voltage stabilization. Why do we use them if ratiometric design cancel the ...
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1answer
1k views

How to interface the HX711 Weight Scale ADC with a microcontroller? [closed]

In my project I need to interface HX711 24 bit External ADC to STM32L100RC6 MCU How can I do this ?
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2answers
80 views

Measuring Load cells [closed]

On a 3-wire load cell that has a black , red, and white wire......... I would think if I ohmed out the resistance between the red and white or red and black or any combination there of, that I would ...
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0answers
321 views

Load cell circuit does not work on circuit simulator

I want to simulate a load cell interfacing with AD620 for amplification. - My load cell is 40 Kg max with 2mV/V sensitivity and 10 V excitation voltage with input resistance of 405 ohm and output ...
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1answer
450 views

Using 8 half bridge load cells together

In my arduino project, I want to combine 8 half bridge load cells (each has 3 wires, RED, BLACK & WHITE) because i will be weighing irregularly shaped objects and 4 points of contacts may not be ...
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1answer
555 views

Why isn't my load cell detected by openscale?

I want to measure the pull force on a rope, so I bought myself a Sparkfun OpenScale and this tensile load cell. I just received both of them, so I connected them as described and hooked the OpenScale ...
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2answers
769 views

Can I read out this 10V load cell with the 5V OpenScale board?

For a robotics project in which I want to build a kite flying robot I want to measure the pull force on the rope connected to the kite. To measure this pull force I bought this load cell (which ...
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1answer
963 views

INA125P Strain gauge amplification problem

I'm using the INA125P to amplify the strain of a 350 ohm strain gauge in a self-built Wheatstone bridge circuit for measurement. I'm testing using a 351 ohm resistor to mimick a strain gauge under ...
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1answer
102 views

Negative differential to instrumentation amplifier causing problems

I am using a pair of strain gauges to make a weight scale. The strain gauges are the three-wire type that you can by on Amazon or Sparkfun. The strain gauges form a full wheatstone bridge, whose ...