Questions tagged [load-cell]
A load cell is a transducer which converts force into a measurable electrical output.
247 questions
0
votes
1
answer
163
views
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 ...
- 7
0
votes
2
answers
844
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?
0
votes
1
answer
610
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 ...
- 103
0
votes
2
answers
57
views
Dimming energy with load cell
I'm a lawyer with no technical background. I'm just a geek! :D
I wonder if it is possible without using a micro controller can a load cell dim the amount of energy supplied by a 3V battery?
The ...
- 103
0
votes
1
answer
444
views
AD7190 voltage reference
I'm using AD7190 with a 4-wire load cell to build a pressure acquisition board. From ADI reference design(CN0102), I understand that connect sense+- lines of a 6-wire load cell to the ref+- pin of ...
- 93
0
votes
1
answer
213
views
Suitable op-amp and voltage regulator for 16-bit ADC
I would like to use the AD4008 16-bit ADC from Analog Devices to sample a load cell. I also need a linear regulator and driver amplifier and instrumentation amplifier.
I am curious to know if these ...
- 27.6k
0
votes
1
answer
921
views
How to determine if a load cell is quarter-bridge, half-bridge or full-bridge?
Im looking to purchase 4 disk type load cells for weighing applications but it doesn't mention what configuration it is in (quarter bridge, half bridge etc.) Is it safe to assume 2 wire load cells = ...
- 115
0
votes
1
answer
146
views
Regarding PLC and several input/ output modules
I have to use more than 40 servo motors and 20+ load cells using PLC. But the problem is that I have to use many I/o modules ( that is costly and hectic). Can I reduce the no of I/o modules by any ...
0
votes
1
answer
1k
views
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 ...
- 619
0
votes
1
answer
138
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 ...
- 309
0
votes
1
answer
2k
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 ...
0
votes
2
answers
2k
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 ...
- 485
0
votes
1
answer
7k
views
Has anyone worked with HX711 load cell amplifier / weighting sensor through Arduino? [closed]
I am talking about this product: http://www.ebay.in/itm/232127458591?aff_source=Sok-Goog
I need to know the following:
1) What outputs are represented by DT and SCK?
2) What inputs are B- and B+?
...
- 113
0
votes
2
answers
2k
views
Understanding load cell
I am trying to understand how load cell works and which one to choose for my project.
For example lets say I use this load cell.
List of properties in case the link won't work:
Weight Capacity Max 5 ...
- 7
0
votes
2
answers
1k
views
Using 3.5 mm cable to connect load cells?
I have some 300 lbs. 4-wire load cells that I need to connect to a PCB. Their nominal resistance is 350 Ω, and they will be excited at 3.3 V. The goal is to read the force on a PSoC microcontroller. ...
0
votes
1
answer
1k
views
Can I measure large force using series FSR?
Is it possible to measure large force using multiple Force Sensitive Resistors in a series? Will I have to stack the resistors up? Will the measurement be reliable if I place them side by side?
I ...
- 1,191
0
votes
1
answer
5k
views
How to calculate the gain for a load cell to be used with instrumentation amp?
I was hoping someone can give me a step by step process for calculating the gain of my load cell.Here is the datasheet to it LoadCell datasheet.
I also plan on using the INA125p instrumentation ...
0
votes
2
answers
1k
views
Using DAC to create reference in a wheatstone bridge for strain gauge?
I am designing a circuit where a microcontroller can measure the load forced upon a load cell with strain gauges, making a half bridge.
A traditional Wheatstone bridge looks like this:
Resistors ...
- 537
0
votes
1
answer
1k
views
How to read signal from load cell?
I took apart a weighing scale to get the load cell from it. The weight scale was capable of measuring up to 85 pounds with 5 grams precision. The voltage drop of the weight scale, however, is too ...
- 511
0
votes
2
answers
4k
views
Filtering Noise on Strain Gauge Circuit
I am making a digital weighing scale circuit and currently having difficulties understanding filters that are commonly used to reduce noise in these type of circuits. My load cell is a full-bridge ...
0
votes
1
answer
915
views
Instrumentation amplifier for load cells
In the most part of tutorials I see they use INA125 as the instrumentation amplifier for load cells.
Is it ok to use another cheaper amplifier as the AD8237? Or is there a specification or ...
- 293
0
votes
1
answer
621
views
Connect analog load cell to usb via AVR
I have an analog load cell with just 4 wires sticking out of it.
I want to be able to connect it to a computer via usb.
For that I am going to use the AVR micro controller and LUFA usb library.
My ...
- 163
0
votes
1
answer
423
views
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 ...
- 1
0
votes
1
answer
419
views
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 ...
- 59
0
votes
1
answer
350
views
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 ...
0
votes
2
answers
203
views
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 ...
- 11
0
votes
1
answer
1k
views
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 ...
- 1
0
votes
2
answers
58
views
How to change get positive value on my weighting Scale?
My weighting Scale is working fine when I keep weight after the start. But I am getting stuck when I keep weight before starting my weighing device. When I do this auto-calibrate with available weight....
0
votes
2
answers
2k
views
How to measure multiple objects' weights with load cells and Raspberry Pi 4?
I am working on a class project that involves a raspberry pi and strain gauge load cells. .
The goal is to measure the weight of two or more objects using a set of two load cells (In the picture it ...
- 55
0
votes
1
answer
70
views
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 ...
- 111
0
votes
1
answer
1k
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 ...
- 133
0
votes
2
answers
143
views
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/...
- 1
0
votes
1
answer
451
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 ...
- 101
0
votes
3
answers
2k
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 ...
- 219
0
votes
1
answer
934
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 ...
0
votes
1
answer
203
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 ...
- 91
0
votes
1
answer
573
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 ...
- 33
0
votes
1
answer
323
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 ...
0
votes
1
answer
163
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 ...
0
votes
1
answer
463
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 ...
- 153
0
votes
1
answer
2k
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 ...
- 113
0
votes
2
answers
169
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 ...
- 21
0
votes
1
answer
737
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 ...
- 485
0
votes
1
answer
2k
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 ...
- 63
0
votes
1
answer
396
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 ...
- 115
0
votes
1
answer
515
views
Load Cell has abnormal wire coloring
pulled a load cell from a small scale that I bought from amazon. I read online about how to use a INA125P to amplify the signal from the load cell, but when i examined the load cell i pulled from the ...
- 3
0
votes
1
answer
2k
views
Connecting a (small) load cell to Arduino using INA125P
I want to connect the load cell of my (micro) scale to my Arduino. The scale itself is able to weigh max. 800 grams with an accuracy of 0.1 grams - what I want to weigh are loads up to max. 100 grams, ...
0
votes
1
answer
2k
views
measuring load cell output by a oscilloscope
Is it possible to read a load cell output (0~10mV with 10nV steps) by a oscilloscope? or I should buy an extra high precision Multimeter to read the load cell output?
0
votes
1
answer
592
views
Load cell for Capsule filling machine
(I am new in this era, so go easy on me :) )
I am working on a project that involves weight filling of powdered material into capsules (Fill sizes, 400 , 600 & 800 mg). . Now for the design of ...
- 101
0
votes
1
answer
740
views
Hooking up a 3 wire load cell and measuring the output on an ADC
I am trying to get 4, 3 wire load cells connected together in the form of a wheatsone bridge correctly to measure weight. I have the following schematic used from this http://www.nerdkits.com/forum/...
- 507