All Questions
Tagged with load-cell wheatstone-bridge
27 questions
2
votes
2
answers
2k
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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 ...
0
votes
2
answers
843
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?
1
vote
1
answer
1k
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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 ...
12
votes
3
answers
1k
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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/...
- 13.1k
0
votes
0
answers
52
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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 ...
- 1,364
0
votes
1
answer
919
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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
2
answers
2k
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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
1
vote
0
answers
262
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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
0
votes
0
answers
613
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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:
...
- 121
5
votes
1
answer
830
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Difficulties reverse engineering a digital bathroom scale
I apologize if this has been discussed elsewhere and for the length of the post. This is a group project and we plan to take the weight value from the scale and send it via a WiFi connection to ...
- 51
1
vote
0
answers
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
votes
1
answer
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 ...
- 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
1
vote
2
answers
410
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Hook up a load cell with High Level Amplied Output (only input+ input- output+) to load cell amplifer
I have been successfully hooking up load cells (e.g., TAS606, red = E+, green = O+, black = E-, and white = O-) and load sensors (with help from a load cell contaminator ) to load cell amplifer (e.g., ...
- 113
3
votes
1
answer
736
views
Monitoring a large array of load cells
I have a large array of 8x8 load cells I'd like to monitor, and I'm looking for an efficient way to do that.
Obviously, one option is 64 independent instrumentation amplifiers, but that's expensive ...
- 7,749
6
votes
2
answers
23k
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Connect HX711 to a three wire load cell
I have the following load cells:
I'm using the following HX711 amplifier
Every guide i can find on the internet describes how to connect a load cell with four wires to the amplifier. How can i ...
- 161
2
votes
1
answer
4k
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Arduino with Weighing Scale
Let me preface this by saying I'm a total beginner to this. My area is Software, not usually electronics; and I haven't done any since I was in high school.
I've done a lot of reading about ...
- 143
1
vote
3
answers
2k
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Four Half Bridge Load Sensors outputs highly fluctuating values
I have four half bridge strain gauge load sensors connected in a wheat-stone bridge configuration. I have fed the output of the sensors to the ADC (ADS1230) which is a 20 bit analog to digital ...
- 51
2
votes
1
answer
6k
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Configuration of load cell on digital scaling
UPDATED!
Anyone can tell me how to configure the load cell (like mine is MLC902) on digital scale? How is the calculation voltage output when is loaded by 50kg or 100kg?
- 21
0
votes
2
answers
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
vote
0
answers
402
views
How to make a weighing scale with independant load cells
Im working on a project for school and I need to make a scale that measures weight and also accurate pressure readings at differnt points.
Is it possible to make a scale using four independant load ...
- 11
1
vote
1
answer
6k
views
3 wire load sensor connection to INA125P
I am trying to use a 3 wire load sensor, connect it to INA125 for voltage amplification and then use the amplified output to be fed to ADC of Arduino.
I had used below configuration with INA125.
...
- 601
1
vote
1
answer
8k
views
What is the difference of a loadell input and output resistance?
I am trying to understand the specifications of a load cell and there are the input and output resistance as you can see here, it says 1090±10Ω for input resistance and 1000±10Ω of output resistance.
...
- 293
13
votes
4
answers
36k
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3-wire load cells and wheatstone bridges from a bathroom scale
I am involved with a 4H project looking to take some weight measurements with bee hives and am trying to figure out some 3-wire load sensors to do just that.
I have four 3-wire sensors (load sensors/...
- 131
3
votes
4
answers
6k
views
Combination of four half-bridge load cells
I have a kitchen weight scale containing four half-bridge load cells, each cell associated to one foot of the scale.
I want to hack it to use it as a pressure sensor and link it to an Arduino ...
- 31
12
votes
4
answers
17k
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Digital bathroom scale circuit - how it works?
I'd like to understand how the digital bathroom scales work. I was able to gather that there are four three-wire load cells connected into the Wheatstone bridge as suggested below. The load cells have ...
- 299
6
votes
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 ...
- 4,972