Questions tagged [load-cell]
A load cell is a transducer which converts force into a measurable electrical output.
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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How to hook four strain gauges (5 wire) to an ESP32?
I have four strain gauges (50 kg) with 5 wires each (red, black, white, green, and yellow) and I want to measure the weight of a platform. I assume those should be hooked to an HX711 load cell ...
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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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Load Cell Amplifier
I'm not from an electrical background and am looking for possible options to amplify the load cell output. I'm using a load cell with a 2 mV/V output.
http://www.sentranllc.com/pub/datasheets/...
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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 ...
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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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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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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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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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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 ...
user214183
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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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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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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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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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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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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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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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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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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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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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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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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. ...
user161991
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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