All Questions
42 questions
2
votes
1
answer
60
views
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 ...
- 121
0
votes
0
answers
59
views
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 ...
1
vote
1
answer
148
views
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 ...
- 167
0
votes
0
answers
101
views
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 ...
- 109
0
votes
0
answers
64
views
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 ...
- 53
0
votes
0
answers
99
views
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 ...
- 7
1
vote
1
answer
313
views
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 ...
0
votes
1
answer
348
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
851
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 ...
- 111
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
1
vote
1
answer
142
views
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&...
- 251
0
votes
2
answers
458
views
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 ...
0
votes
0
answers
71
views
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 ...
- 1
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
118
views
TRT-25 and Arduino Uno
I need help on a project I am working on.
We are trying to integrate a reaction torque sensor and I am having a hard time deciding how to go about it.
Previously I assumed that like my load cell I ...
- 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
3k
views
How does the HX711 circuit work?
This scheme will be designed for weight scales. Why is there a transistor installed.
And I want to understand why need capacitors and resistors in this circuit. (their purpose)
The documentation does ...
- 53
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
2
votes
4
answers
2k
views
Build a scale without computer
I need to build a scale that is not attached to any computer. The goal is to weigh a dustbin and show the weight value on a small LCD screen. The weight I want to measure is approximately 10 kg, but I ...
- 423
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
1
vote
1
answer
1k
views
Can I use any GPIO pins on the Raspberry Pi for the HX711 Amplifier?
We're going to use an HX711 amplifier to read data from a strain gauge - the SparkFun page says you can use any GPIO pins but it one is "clock" and one is "data." What does that mean in this case? ...
- 239
0
votes
0
answers
613
views
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
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
2
votes
1
answer
1k
views
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 ...
- 201
1
vote
2
answers
410
views
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
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
-1
votes
1
answer
1k
views
Readings from Load Cell Combinator and HX711 connected to an Arduino Uno
I'm trying to get a reading from a set of four 3-wire load cells connected with a Sparkfun Load Cell Combinator (link removed) to a Sparkfun HX711 amplifier.
I've followed the Sparkfun hookup guide (...
- 1
0
votes
2
answers
189
views
Can I read a Load Cell value from Electric Imp?
I would like to connect a Load Cell to an Electric Imp and read the weight's value.
I have found quite a few of tutorials where a temperature sensor is attached to the Electric Imp (see: https://www....
- 103
1
vote
2
answers
1k
views
How to count the number of objects in a bottle?
I am working on a pet project using arduino where I need to keep track on number of objects in a bottle.It requires counting the number of objects(size of a regular pill and approximately of the same ...
- 13
2
votes
1
answer
4k
views
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
1
answer
995
views
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 ...
- 13
1
vote
1
answer
444
views
Load Cell Data Problem - INA125P + Arduino Uno
I am currently reading data from my 30kg load cell with my Arduino UNO board and passing this data to my PC. I am using INA125P to amplify the voltage of my load cell and it is established on a bread ...
- 131
0
votes
2
answers
10k
views
How to set up load sensor in a full bridge with amplifier?
I I'm somewhat new to electronics so forgive me for what I don't know. I'm learning as I go along here.
The overall project is I'm trying to make a scale connected to an arduino board that will ...
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, ...
5
votes
1
answer
17k
views
Arduino Leonardo + 3 wire Load Cells + INA125P – Analog Signal Bounce / Noise
I actually have a software background so my experience in electrical engineering is somewhat lacking. Never the less, I have given my first Arduino project a go and for the most part I am quite happy. ...
- 51
2
votes
2
answers
7k
views
Problem of noise with load cell and INA125P + Arduino Uno
I am here with a problem that I cannot solve. Here are the facts:
I have a load cell : http://www.robotshop.com/en/micro-load-cell-50-kg.html
that I want to use in both directions, from -30kg to 30kg ...
- 21
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
2
votes
1
answer
10k
views
Hacking a four load sensor based personal weighing scale
I am trying to hack a personal weighing scale.I had taken help of this tutorial but the language used in this is not very easy to understand due to the non-standard naming used for load sensor wires, ...
- 601
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
2
votes
1
answer
2k
views
Multiple ADC readings in Arduino Uno with INA125 problems
First my system used four cheap resistive load cells (maks 5 kg, input 5 VDC) to measure COG of a quadrotor. The measurement pan dimensions are 60 cm x 60 cm and made from glass (...
- 29
0
votes
1
answer
556
views
Load Cell DAQ via Arduino Mega
Background: I'm working on a project that involves tapping into the load cells of a scale and reading the differential output of the Wheatstone bridge. I need to keep all of the original functionality ...
