All Questions
Tagged with load-cell strain-gage
26 questions
0
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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 ...
- 1
0
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2
answers
63
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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 ...
- 13
3
votes
3
answers
2k
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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 ...
- 329
0
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2
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851
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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 ...
- 111
1
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1
answer
685
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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 ...
- 25
0
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2
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106
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Does shunt calibration of a sensor also correct for zero error?
In the datasheet for a load cell (shown below), it says that shunt calibration data is given, also they have mentioned the zero balance. Does the shunt calibration consider zero balance? Meaning, do I ...
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What are the trade-offs between different values of resistance for a wheatstone bridge?
I have a loadcell with a bridge resistance of 10k and I've asked the manufacturer for a new design with RTDs and a slight mechanical change, and as a consequence, the manufacturer's proposed new ...
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7
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7
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5k
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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....
- 105
0
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0
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315
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Reduce load cell creep and drift programatically
I am trying to build a weigh scale and have read through the parameters that affect its reading in the long run. My question is can we reduce the Creep and drift of the load cell by compensation ...
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3k
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How to connect two load cells to one HX711?
I have two 5 kg load cells and one HX711. The project's goal is to connect them together, and measure the weight of the same object. I would like to get the average in order to make my calculations ...
- 55
0
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1
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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 ...
- 111
0
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0
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694
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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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2
votes
0
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515
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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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1
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2
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775
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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 ...
- 23
0
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1
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451
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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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1
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2
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1k
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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?
- 239
1
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2
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552
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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 ...
- 213
1
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0
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905
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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 ...
- 11
0
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1
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2k
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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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0
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1
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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
1
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1
answer
995
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Measuring touch-weight resistance in piano keys
Piano technicians, such as myself, use an old, labor intensive way of measuring touchweight resistance in piano keys. I would like to automate this process electronically.
This is an explanation of ...
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1
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0
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70
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Why does this seem like a strange way of connecting a bridge circuit to the ADC?
I was planning to hook up a quarter bridge circuit to the AD7730LBR Analogue to Digital Converter that I bought. I was having a look at a "Load_Cell_Schematic" provided by this webpage (the download ...
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0
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2
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1k
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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
1
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2
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676
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What is the strain gauge resistance variation of a 3-wire loadcell?
A 3-wire loadcell have two strain gages with a no load resistance of R.
When a load is applied, the resistance of one strain gauge will change to R+dR and the other will change to R-dR (because one ...
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6
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3
answers
19k
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Is the Excitation Voltage of a load cell a strict specification?
When using load cells (or strain gages generically), is the Excitation Voltage spec provided as a strict minimum -- or is it just a recommendation which one can go below as long as one is OK with a ...
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5
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2
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8k
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Load Cell Amplifier AD620
I know AD620 is an old part but it is available at my place. I intend to develop a Load Cell amplifier. Load cell is 2mV/V. I am planing to use AD620 for it. Following are my calculations:
Excitation ...
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