All Questions
53 questions
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31
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Trying to set up a data acquisition system--have some questions
I'm setting up a data acquisition system for some load cell, pressure ducer, and thermocouple inputs. Currently looking at the LabJack T7 for my ADC and INA125 for my load cell amp. PTs are self-...
- 1
1
vote
2
answers
121
views
hx711 high current consumption
I have one hx711 module connected a 200 kg load cell and I'm measuring a high current consumption: around 13mA where the datasheet says it should be around 1mA.
Cabling is as follows: usb to the mcu (...
- 23
7
votes
4
answers
704
views
Differential vs. Single-Ended amplification for sensor sampling
I'm designing a load cell amplifier that should be low-cost, and functional in a noisy environment. The load cell is a 1k balanced full-bridge on a single package. The read speed requirement is only ...
- 161
0
votes
0
answers
53
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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 ...
- 151
0
votes
0
answers
101
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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 ...
- 109
0
votes
1
answer
169
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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 ...
- 417
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
1
answer
1k
views
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 ...
1
vote
1
answer
142
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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 ...
- 8,744
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 ...
-2
votes
1
answer
107
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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 ...
0
votes
2
answers
460
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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 ...
1
vote
1
answer
686
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 ...
- 25
1
vote
1
answer
170
views
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 ...
- 11
1
vote
1
answer
513
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 ...
- 13.1k
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
3
votes
2
answers
217
views
Do ADS12XX circuit need an amplifier?
I'm working on a project that use various analog sensors (load cells, microphone, pressure, etc.) All of them have an analog standard output (mv/V). I'm using a Raspberry Pi. I want to choose a module ...
- 131
3
votes
1
answer
1k
views
HX711 with RaspberryPi and python
I have been working to create a digital scale for IOT project, using HX711 ADC.
The problem
Since it is crucial to have wifi connection, I use Raspberry Pi, to control the scale.
Everything works well,...
- 131
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
0
answers
402
views
MCP3561 Configuration registers resetting upon relay activation
I am looking for advice on how to solve a problem I'm encountering with my PCB project. The application involves reading a weight from a cluster of load cells and activating a relay that controls a ...
- 41
2
votes
0
answers
1k
views
Homemade NAU7802 breakout board not preforming like reference
I am designing an NAU7802 breakout PCB for a small weight scale project I'm working on, but I've had bad luck getting it working. I am comparing its performance with the Sparkfun Quiic Scale (their ...
- 61
1
vote
0
answers
523
views
HX711 noise, but only in a specific environment
I'm working on a small project at my farm to automate vegetable weighting. The system consists of an STM32 MCU, some additional ICs (matrix decoder, parallel-serial converter for some push-buttons etc....
- 31
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
1
vote
2
answers
5k
views
Load Cell ADC HX711 Alternatives?
Looking for an HX711 ADC alternative. Sparkfun sells a pricey breakout board with the chip, but I cannot source the IC anywhere online for some reason 🤷♂️. Are there any ADCs out there that have a ...
- 433
0
votes
1
answer
335
views
Can I "sum" internal ADC channels to achieve extra bits resolution?
First of all I am a newbie in electronics.
I am building some weight scale applications using (as seen everywhere) load cells wired to a HX711 ADC and a ESP8266. I am now giving a try to the Texas ...
- 145
1
vote
1
answer
403
views
What would cause an ADC to stick on an arbitrary value?
I have a differential ADC (HX710) that I am using to interface a load cell. The wiring is as follows with (J4) going to the load cell:
Mostly, this reads very reliably and accurately. However, ...
- 203
0
votes
0
answers
2k
views
Is AD7794 a good alternative to Hx711 for multi-channel ADC?
note: Electronics isn't my main background so I might make silly mistakes. I did read the datasheet but don't understand all the terms despite my effort. Suggestions are welcome.
AD7794 (datasheet) ...
- 111
0
votes
0
answers
694
views
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. ...
- 61
0
votes
0
answers
223
views
ADC value changes with changing power supply
I'm measuring weight using hx711 ADC and load cell.
HX711 schmatic:
I use 12V 1A power supply and 6V/4Ah dry cell. Also I use MT3608 boost converter to increase battery voltage to 12V because ...
- 109
2
votes
0
answers
515
views
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 ...
- 31
1
vote
3
answers
876
views
Bipolar signal used in differential ADC
I'm trying to find a way to convert a bipolar signal from a load cell (Futek) to an input for a differential ADC on a TIVA microcontroller(TI TM4C123GH6PM). The load cell's amplifier outputs a bipolar ...
1
vote
3
answers
494
views
Load sensor ADC converter
Load sensor required external module HX711 (ADC converter 24bit for weight) for ADC converter. This module is then connected to the controller.
If I have a controller with inbuilt 24bit ADC, then is ...
- 31
1
vote
1
answer
876
views
hx711 values non-linear
I have an hx711 ADC module with 4 50kg load sensors wired in a wheatstone bridge (for a maximum load of 200kg).
When I apply load to the sensors, the resulting values for increasing weights appear to ...
- 123
0
votes
0
answers
97
views
Remove Contactor Noise from Load Cell Reading
I have connected my ADS1231 with STM32F030R8T6 as shown in the attached image.
I have given 3.3 V power to both micro controller and adc. I am connecting load cells and i am getting satisfactory ...
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 ...
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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
2k
views
How to interface the HX711 Weight Scale ADC with a microcontroller? [closed]
In my project I need to interface HX711 24 bit External ADC to STM32L100RC6 MCU
How can I do this ?
- 109
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
2
votes
4
answers
3k
views
Remove spikes from Load Cell readings
I have developed load indicator interfaced with load cell to display the value of load. The device is to be used in on-line weighing of a bag that is moving over the conveyor. Due to the mechanical ...
1
vote
2
answers
2k
views
Is programmable gain amplifier(PGA) in ADC enought to get me precision
I have 4 x 3wire load cells from a old weight scale connected as a full-bridge and I want to connect them in my uC ( Atmega328P, but not arduino ).
I want to measure weight under these specs:
...
- 414
1
vote
2
answers
5k
views
How to smooth analog data?
I am trying to read load cells data, but these values are very fluctuating. I have ADS1230 ADC and I had configured it to the internal gain of 128. Four half-bridge load cells are connected in a ...
- 680
1
vote
3
answers
2k
views
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
2
answers
533
views
Vacillating display with ICL7107
for my first project I decided to make a scale using a load cell, the micro load cell 3133 from Phidgets. I also used an ICL7107 as A/D converter and the op amps are LM358.
I used a differential amp ...
1
vote
2
answers
2k
views
Reading ADC using Altera DE2 Board (Beginner)
Question:
Would it be possible and feasible for a beginner to use Verilog HDL and an Altera DE2 board to read input from a weight sensor's HX711 ADC (see below), and if so:
What kind of data am I ...
- 113
1
vote
0
answers
70
views
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 ...
- 73
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
1
answer
756
views
Precision voltage reference for load cell and ADC
I want to know what could I use to have a stable 5V excitation voltage for my load cell(wheatstone bridge) which I could also use to have a stable 5V reference voltage for my arduino adc. Would a ...
0
votes
1
answer
114
views
Earth alternative
I'm designing an industrial machine which is AC motor derived. There are sensitive analog sensors (e.g. Load cell) in the system and in the user's site, Unfortunately earth connection is not ...
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