Questions tagged [load-cell]

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

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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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Similar ADCs, Different Applications? (ADS122C04 vs ADS1220)

I'm looking at two different ADCs from TI, the ADS122C04 and the ADS1220. The first page overviews are nearly identical - other than the communication protocol, the only difference is that the 1220 ...
InBedded16's user avatar
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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 ...
Offswitch's user avatar
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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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Diagonal Load Cell Fluctuations in Weight Measurement

I've been working on a project involving a machine utilizing four load cells to measure the weight of liquids accurately. The system is functioning well, precisely determining the weight of the placed ...
mastermind's user avatar
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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 ...
shafiyyah's user avatar
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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 ...
Ankit_Gunner's user avatar
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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 ...
John Hawk's user avatar
1 vote
1 answer
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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 ...
tomcajot's user avatar
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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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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 ...
TheCodeNovice's user avatar
3 votes
3 answers
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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 ...
kenntnisse's user avatar
2 votes
3 answers
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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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ADC CS5532: "digital gain scaling" - ADC Calibration without full scale signal

I'm making a digital weight scale with Arduino and CS5532. My problem is to calibrate adc with the offset signal and a known weight signal that is not full scale point. The CS5532 allows me to ...
Carmine Zagaria's user avatar
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Why does HX711 load cell amp not have an I2C address?

Context: I am trying hook up the TI CC26X2R1 dev board to a 5 wire load cell to act as an end device in a Thread network. I use the Sparkfun HX711 load cell amp to amp and as an ADC (links for both ...
jamcollins123's user avatar
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539 views

What is the maximum frequency that I can get reliable weight data from a strain gauge load cell?

I need to build a scale that uses a strain gauge load cell such as the one below: https://cdn.sparkfun.com/datasheets/Sensors/ForceFlex/TAL220M4M5Update.pdf The weight data will need to be stored with ...
dataengineer22's user avatar
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Coin cell holder not powering circuit

I use a 3023 Keystone electronics, through-hole coin cell holder in my circuit. When I connect the Arduino to my computer, it gets powered up without any issue and my circuit works just fine. The ...
tomcajot's user avatar
1 vote
1 answer
67 views

Thermoelectric EMF problem for low voltage measurement load cell

The resolution of a load cell is highly dependent on its capacity. That's because the higher the resolution and the higher the capacity, the smaller the voltage change. For example, many companies ...
Herza Ryo's user avatar
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1 answer
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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 ...
Lorenzo Marcantonio's user avatar
11 votes
8 answers
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What is the ideal method of sensing whether 4 points on the bottom of a device are all depressed to indicate contact?

I am trying to place a sensor or switch on each corner of some desktop PCs so that if they are lifted an event is triggered like locking the computer or encrypting it. So far I have considered small ...
Diagram Alley's user avatar
2 votes
2 answers
1k views

How to improve HX711 to feed two or more load cells in parallel?

HX711 datasheet Load cells I'm using I have typical load cells and want to connect them in parallel directly to the HX711 "A" section of the amplifier. The load cells have an input ...
Tumenbayar Munkhjargal's user avatar
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2 answers
536 views

How can I calculate the values of the four resistors in a Wheatstone bridge?

I measured black-red = 400ohm, green-white = 350ohm in a 5kg loadcell. How can I calculate the resistor values?
Tumenbayar Munkhjargal's user avatar
1 vote
1 answer
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How to read four load cells with a single ADC input?

I am currently using strain gauge based load cells and want to weigh 1-5kg granular products on whatever container with 4loadcells beneath. I encountered a problem with connecting load cells in a ...
Tumenbayar Munkhjargal's user avatar
-2 votes
1 answer
102 views

Question regarding the ADC MCP3201 interfacing with PIC16F72 microcontroller

I provide the 1.2 MHz clock to SCK pin to the ADC from PIC clock pin, but how I can receive the data from MCP3201 ADC, which provides a 12 bit binary data on SPI pin SDI of PIC? Buffer of PIC is 8 bit ...
Amol Gholap's user avatar
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398 views

How do I remove bathroom scale auto shutoff feature?

I’m a software guy so please excuse any silliness in this question. I need a scale which will not shut off on its own and continuously show changing weight values. Although I may have no choice but to ...
Shahbaz's user avatar
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How can I synchronize load cell and sensor for sensor calibration?

I have made a glove with some cheap pressure sensors with weight ∝ 1/resistance. DESIRED OUTPUT I now want to create a dataset with columns "Actual Weight" and "Glove Sensor Readout&...
Leo's user avatar
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HX711 load cells giving wrong readings

I have four HX711 cells in a Wheatstone configuration. I use them from home automation to measure bed presence. It worked correctly for a few weeks, but suddenly stopped working (cannot get any useful ...
Bram Gerritsen's user avatar
1 vote
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380 views

HX711 zero factor

I have three load cells (YZC-1B). These load cells' capacity is 50 kg. I guess I use Bogde's HX711 library. In monitor, the zero factor for the first two load cells is 8,000,000, but for the last load ...
buccno's user avatar
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Electrical noise in 18650 3.7V lithium batteries

I'm interested in knowing the electrical noise in Volts of modern 3.7V lithium batteries, specifically my model is NCB18650B, but since I don't have an oscilloscope I can't measure it. On the internet ...
boromyr's user avatar
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2 answers
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Question on load cell amp HX711

How do you make a load cell's amp HX711 measure both positive and negative values, or how do you set the center value for it? The main point is how to set the reference voltage (?) or something else ...
Sieben's user avatar
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Connector for load cell

I'm working on a scale that uses a tin-plated connector between the load cell and the PCB where the ADC is mounted. The connector is JST ZH (4pins) tin-plated. During testing of this design, I have ...
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CS5530 - Read serial data through SPI [closed]

I am trying to read data from a CS5530 using SPI. I have gone through the complete datasheet but I don't understand what is missing. I am getting the same value every time even after changing the load ...
Syed Hassan's user avatar
1 vote
1 answer
457 views

Wheatstone Bridge strain gauge thermal compensation design

I'm designing a full Wheatstone bridge for measuring the bending strain in a steel bar. I have a circuit available to me that uses an ADS1232 to measure the output of the wheatstone bridge. When ...
mosfeta's user avatar
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Oscilloscope or bench multi-meter for ultra high sensor sample rate measurement

I need a device to measure the output of a load cell at very high sample rates. I am aiming for a sample rate of at least 100 kHz. For this goal, I wanted to ask if it would be better to use a bench ...
Enzo Damato's user avatar
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Arduino Load Cell Limitations

I came across this forum in my research on load cells for a project at work. I had order the load cell and an amplifier/display but turns out there's no way for the display to show lbs it only shows ...
rroberts's user avatar
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1 answer
864 views

Minimize load cell amplifier noise and interference INA122P

I am trying to simulate car pedals with load cells. For that I wired up 2x20kg load cells and 1x 100kg load cell each wired to a INA122P which join up at a stm32f103c8 blue pill board. The circuit ...
Carl's user avatar
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2 votes
2 answers
604 views

Calibrating 500 kg load cell with an ESP32 and HX711 without putting actual 500 kg on it. 3 V excitation

I am making a 500 kg scale using an ESP32 and HX711. It is battery powered and uses 3 V excitation. In the calibration process, I increase the weight by 50 kg steps and read the HX711 output and then ...
user2910761's user avatar
12 votes
3 answers
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Need help understanding schematics in LT1019 datasheet

We are currently using AD7795 to get ratiometric reading of 4 load cells. It works, but the chip stocks are rather volatile. So, I am thinking on using much cheaper and easier to come by MCP3424/...
Maple's user avatar
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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 ...
karel.o's user avatar
1 vote
1 answer
402 views

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 ...
Maple's user avatar
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