Questions tagged [load-cell]
A load cell is a transducer which converts force into a measurable electrical output.
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Why do my HX711 load cell readings drift significantly over time?
I bought four 5 kg load cells (link) and connected them all together (all white cables, all green cables, etc.). Then I hooked them up to the HX711:
When I read the values from the Arduino using the ...
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Instrumentation Amplifier and differential ADC Arduino Mega
I am working on an acquisition system, which measures tension and compression in a load cell. I amplify the signal with the Instrumentation Amplifier INA128P, and after that I connect it to the ...
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Precise Electronic Measurements
I've been looking into various electronic components and noticed rampant 5%, 10%, and even 20% tolerances and accuracies not only in basic components such as capacitors, inductors, and resistors, but ...
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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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Comparing ADC noise parameters
I'm looking at two ADC parts the ADS1230 and the ADS1231; the 1231 is an almost pin-compatible upgrade (if you don't need the ×64 gain setting) which provides 24-bit resolution and some more noise ...
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FX29 Load Cell - Sleep Mode vs Update Mode
Context
I'm using an I2C based Load Cell the FX29.
I have been having troubles where the I2C sensor does not give me any data unless I manually unplug and replug the sensor while the Arduino sample ...
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Trying to set up a data acquisition system--have some questions
I'm setting up a data acquisition system for some load cell, pressure ducer, and thermocouple inputs. Currently looking at the LabJack T7 for my ADC and INA125 for my load cell amp. PTs are self-...
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Load cell mathematical model
I'm studying a solution for a weight measuring system that's affected by enviroment vibration - a load cell fixed on a "shaky" frame. My first thought was to use a 3-axis accelerometer (or ...
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Load cell value becomes negative when above certain force
I have a 100 gram load cell with the hx711 amplifier board. I have it wired up to an arduino nano with an NRF24L01 module to send the raw value to another arduino nano.
The problem is that when I aply ...
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hx711 high current consumption
I have one hx711 module connected a 200 kg load cell and I'm measuring a high current consumption: around 13mA where the datasheet says it should be around 1mA.
Cabling is as follows: usb to the mcu (...
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Calibrating 500 kg load cell with an ESP32 and HX711 without putting actual 500 kg on it. 3 V excitation
Edit and update !
Considering the following data sheet ( calibration data from factory) what is the correct math to calculate the weight?
500 Kg = Excitation * rated output. ?
Or
Weight = 41.01 * ...
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Differential vs. Single-Ended amplification for sensor sampling
I'm designing a load cell amplifier that should be low-cost, and functional in a noisy environment. The load cell is a 1k balanced full-bridge on a single package. The read speed requirement is only ...
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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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10 µF and 0.1 µF capacitors not making any difference in filtering out noise
I have two circuits (green and brown) featuring a load cell, HX711, and ESP32-C3:
The HX711 and ESP32-C3 go on top of those round female pin header.
The only difference between them is that one 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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HX711 powered directly from coin cell
Is it a good idea to use HX711 in a project (personal weight scale) that is powered directly from a coin cell (CR2032) without any external or its internal voltage regulator? I shut down the whole ...
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I2C communication between load cell and Arduino
I am using Load Cell (FX29 Data Sheet) and Arduino for measuring force. Every time I disconnect and reconnect Arduino from USB I get one of the following readings on serial monitor:
Correct expected ...
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INA125 Reference Voltage lower than expected
I am using a INA125 to amplify the signal from a load cell. When I connect everything according to the datasheet as seen below, the reference voltage drops when I connect the load cell. I am supplying ...
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What components are used for pressure sensing in a DanceRush Stardom dance pad?
This is an arcade rhythm game called DanceRush Stardom, a similar concept to Dance Dance Revolution, but the dance pad acts more like a large screen and tracks both feet.
Here is an example video of ...
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Using an ESP32 with a load cell with 5 V recommended excitation voltage
I am making an IoT device using an ESP32 that powers a load cell with 5 V recommended excitation voltage. I know the ESP32 output is 3.3 V, but I need it to be 5 V. Is there a way to do this with a ...
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Extending load cell wires for weight transmitter connection
I have a load cell that I want to install in a certain location. I plan to connect its output to a load cell transmitter, which is approximately a meter away from the maximum length of the load cell ...
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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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Is it normal for load cells (and HX711) to give negative values when there is no load applied?
My load cell (and HX711) gives values like these (44~45 g is with an object put on top):
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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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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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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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Parallel load cells on a same current source
I need to read 4 load cells with relatively low resolution (12 bit is OK) and frequency (10 SPS is sufficient). The prototype used 2 ubiquitous HX711 breakouts with each powering two load cells in ...
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Is it possible to see which load cell is accounting for how much of the total weight?
I'm a newb when it comes to electronics, learning it as a hobby and was wondering if it was possible to determine which load cell accounts for what % of weight when connected in wheatstone pattern. I'...
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Load cell simulator-mV/volt generation
I am trying to simulate a full bridge sensor load cell.
Here is the reff to the image: https://www.scribd.com/doc/140674267/Load-Cell-Simulator-v2
Above is the reff circuit I am using. I know that ...
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Three-wire load cell and HX711 weight compensation
In my project I use a 3-wire load cell (like this (3-wire 50kg), but mine were purchased from eBay) and an HX711 for weighing.
My wiring is like this (but I use an Arduino Mini Pro 3.3 V):
Apparently ...
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Tension load cell options
I'm designing something similar to an electronic hanging scale (think a heavy object on the bottom, with a scale attached immediately above it). I am not that familiar with what the most typical way ...
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Is there a switch that turns on when it detects a "pull" of a few grams on a string?
I'm working on my first Raspberry Pi project. I'd like to turn my project "on" when a force, of a few grams, is applied to a string (i.e. "pull the string" to turn the unit on, the ...
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Matching ADC and encoder data in time
I'm trying to measure load and elongation in homebrew testing machine. The load is measured by the AD7791 ADC and elongation is measured by linear incremental encoder (quadrature encoder + MCU ...
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ADC count not stable when tapping into a commercial weight scale SPI
I am in the process of designing a weight scale.
To test whether I could achieve the same results in the software I decided to disconnect the MISO, MOSI, SCK and CS from a commercial weight scale MCU ...
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Methods for improving/smoothing the load cell signal
I am using a Delta AS02LC-A cell module and a Zemic 25 kg load cell. Here are some details of the load cell calibration certificate:
And this is the appearance, specifications and wiring diagram of ...
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Connecting multiple full-bridge load cells together with HX711
I am doing a project where I need to connect 2 or 3 full-bridge load cells (the one with 4 wires) together. I am using this type of load cell:
I have read that to have such an arrangement I need to ...
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Why does bathroom scales use half bridge load cell rather than 4 full bridge loadcell in parallel? Except for the price, is there any other reasons?
I have been wondering why does bathroom scale uses 4 half bridge loadcell connected like this figure bellow rather than using 4 full bridge loadcell connected in parallel? Except for cheaper ...
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Load cell trouble, part 2. I have huge, rapid drift, and variation
I've posted very recently about my trouble with load cells. Baffled at how poor my results are. Huge drift to the point that I wouldn't even call it drift. Very noisy readings, too, but I don't know ...
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All load cells and ADCs I've tried give horrible readings. Don't understand how anyone makes anything with them. Losing my mind
I've been fighting with load cells for something like two weeks now. Lost two USB ports on my laptop to 12V in the process. Yet to hear of anyone having this much trouble. Looking for help.
Here are ~...
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load cell calibration with HX711
I am trying to calibrate four 50kg Weight Sensors with Arduino's HX711 Amplifier AD Module. I am getting a variable range of errors. I am using this video as a reference link below. It shows me use a ...
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How to use a load cell?
This is the first time I'm handling a professional load cell, and nobody else at my company has worked with them before.
I'm quite sure I've broken the load cell. I just checked the datasheet and see ...
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Making an automated rig for chemistry test. Cannot read a load cell accurately. Constant drift
I'm making this rig to measure rates of carbonation. It's sensing 6 different variables including mass of sample. The board is Wi-Fi capable (ESP32 WROOM), so I can publish results wirelessly and see ...
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Why is does my INA121 instrumentation amplifier not amplify my load cell's signal at high loads?
I am applying a high load (150-200lbf) to a (mV Wheatstone bridge) load cell rated for 200lbf (link to datasheets at bottom), and amplifying the differential signal with the INA121 instrumentation ...
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DG408 Multiplexer Issue
I connected a DG408 8:1 Multiplexer to 6 Futek Load Cells; the signal of each load cell was amplified by an "ICA-1H" strain gauge amplifier. The output signal of the multiplexer was ...
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How do I read a load cell just with this data?
I have a load cell (capability = 23 kg or 50 lb.) Its output is 2 mV/V. I have read that that means 2 mV per each excitation volt.
The power connection of this load cell is +15V-GND, so 0.002 * 15 = ...
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Inaccurate measurement double load cell circuit
I’m building a circuit with two load cells and I have some issues getting accurate measurements. At first I just soldered the load cells onto the load cell amplifier but as the connections seemed bad ...
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Load Cell Bridge Resistances are ok but I cannot get reading from load cell
I have planar beam load cells that are not functioning. I bought a digitizer which was giving me a reading error which alerted me to an issue. So I unplug the cells from the summation box and I am ...
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Creating a Strain Gauge Load Cell
I want to make my own load cell; how specific do the materials need to be?
For example, is it necessary to buy all the cleaning and gluing equipment shown in strain gauge installation videos? Or can I ...
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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, and white) because I will be weighing irregularly shaped objects and 4 points of contact may not be ...
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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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