Questions tagged [data-acquisition]
The data-acquisition tag has no usage guidance.
99
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Streaming 30 MByte/s into a PC using an FT232H?
I want to bring a continuous 30 MByte/s stream of 8-bit values from parallel-output ADC (AD9283) into the memory of a standard PC (laptop under Windows 10 if possible). My software does real-time ...
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Wheatstone bridge analysis
Hello,
I am facing issues in calculating few parameters for the following information. I am new to this concept of strain gauge, wheatstone bridge, and data acquisition system
Four resistive strain ...
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Datexel DAT3024 4-Ch Digital to Analog Converter (0-10V and 0-20mA): Voltage Output Titles Not Responding
Issue:
I was attempting to perform the calibration procedure for the DAT3024 when all 4 output channels stopped responding to modbus commands to set their respective voltages. This occurred after ...
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2
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What is the size of the variables declared as macros in C Programming?
I am currently trying to receive and process serial data from an STM32F401CCU6. I am receiving binary data from the STM over USB and I would like to re-assemble the raw data into what was originally ...
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Connecting ultrasonic transducer to PC (Data Acquisition) [closed]
I'm working on one project and need some guidance.
I aim to connect an ultrasonic transducer placed on the pipe to the PC so that I can acquire the data and then process it using Python.
I did some ...
3
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2
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390
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ADC throughput calculation
I was studying ADC basics from this document, AVR127: Understanding ADC Parameters. I have a question regarding the throughput calculation. The document reads,
Consider the case of single-ended ...
- 1,580
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68
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Help me understand this mystery data acquisition circuit
Can someone please help me understand this mystery data acquisition circuit.
The circuit is both powered and digital data are communicated using a single wire. Current return is made through chassis. ...
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0
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108
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Logging data from High Precision AD/DA board using Raspberry Pi 3B
I have a High Precision AD/DA board from waveshare with Raspberry Pi 3B (running on Raspbian).
However, I can write only 27 samples in 1s in my CSV file. I am using this Python code for writing to a ...
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82
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Accessing data from a ddr3
I'am working on a new projet where I'm willing to access data from a ram, but the ram's specs is that they work with a frequency up to 667MHz , so I decided to choose an FPGA to work as controller ...
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2
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263
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How to transfer data from high-speed ADCs in MCUs?
Some MCUs contain multiple high spped ADCs, e.g. STM32F303 has multiple 12 bit, 5 MSPS ADCs. Let’s say I am using just one of these to sample a signal. Because 12 bits will be represented/stored as 16 ...
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What is happening when a signal is acquired at exactly Nyquist frequency?
So I am doing some some simulations with 1V sinusoidal signals, and a 1 second acquisition at sampling frequency of 100 kHz.
Now I am slowly increasing the frequency of the sinusoidal signal. Trying 1 ...
- 1,391
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296
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Confusion with trigger controlled analogue output of a DAQ board
I came across this article, and regarding the DAQ trigger and analogue output part I'm confused.
If I don't get it wrong the DAQ generates particular analogue voltage levels for X and Y of the galvo-...
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99
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How does this scan camera send data to a computer?
I am reading the data sheet of this scan camera (mono version.) My aim is to process the data coming from this camera by programming a simple software (using either CPU or GPU.) I see that it uses a ...
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132
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How is CCD data converted to frames in practice?
After reading this article I noticed that one can sample CCD by an ADC and convert the signal waveform to image since each pixel's color is function of ADC sample.
Lets say we can sample this CCD ...
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Is one RLD electrode enough for multichannel ECG acquisition system?
I am trying to design the multichannel ECG measuring device. My device has to acquire 3 signals at the same time. I have to use 6 electrodes to be able to measure those signals. My problem is each ...
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248
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Using plain connectors on thermocouple / external cold junction compensation
We'd like to use plain automotive connectors to connect our thermocouples.
What we are looking for is the ruggedness and economy of such connectors.
Of course, that brings the problem of material ...
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178
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Measure ball speed with sensor inside
I came across a product which is a ball with a small Bluetooth sensor placed inside. This sensor, coupled with an app, can measure ball speed, height and length of throw. I wonder how this is possible,...
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NI myDAQ behaving weird, not measuring inputs after some random time period
I am using the National Instruments myDAQ with MATLAB (using the Data Acquisition Toolbox) to generate a sine wave at defined frequencies at one of the output channels. The output channel is (...
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MCU or other boards with 100 MS/s ADC [closed]
Are there any commercially available microcontrollers or SoC or SBC boards with integrated ADC that can do a sampling at 100 to 150MS/s. Looking for making a high speed and economic data capture ...
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Why are we printing alarm in compact data logger?
I understood most of the things of compact data logger but could not understand why are we printing alarm? And how is that possible to print alarm? Can you share? Also why is there 2 way communication ...
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Are data acquisition system and 'microcomputer on instrumentation design" and data logger the same thing? [closed]
This is data logger-:
This is data acquisition system-:
This is "micrcomputer on instrumentation design"
All 3 look quite similar. What is the difference between each of them? Sadly, ...
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130
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MIPI Bridge 2.5Gbps or Above [closed]
I was looking for some MIPI bridge solution and mostly found MIPI to LVDS Bridge. But the problem with LVDS is that it can't support more than 1.2Gbps.
I was looking for some solution which can ...
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174
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OPA344NA op-amp MEMS Mic
I'm planning on getting Audio Data from a MEMS Analog Microphone with an OPA344Nna as the OP-AMP.
I'd like to just make sure the audio circuit looks correct.
(Analog/Audio is something a bit new to me,...
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Help designing a data acquisition module
I'm prototyping a shoe that reads the pressure distribution of a person's weight as they walk. In order to accomplish this, I need to design a Data Acquisition circuit board that will be compatible ...
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2
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392
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Minimum voltage reference for ADC
I am looking to measure very low voltage signal (0-0.5V range) and was wondering if it is possible without amplification. I am a bit confused about what the minimum references of ADC can be. Looking ...
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How to design a data logger?
Signals from three transducers are to be recorded in data logger. The analogue signal supplied by the three transducers are dual polarity (-50 mV to +50 mV) having frequency is 5 kHz, 10 kHz and 15 ...
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Would analog data loggers record PCB 353b33 accelerometer datapoints for a minute or more?
I'm currently recording data points from an analog accelerometer (PCB 353B33) using a TDS3014B oscilloscope which has a record length of 10,000 points at a sample rate of 1.25 GSa/s.
Since the ...
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1
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116
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How would I build a data acquisition system for SiPMs?
I try to build a radiation detector using of an arrangement of silicon photomultipliers (SiPMs) coupled to a scintillator and I want to read out the number of photons recorded by each SiPM sensor. I ...
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159
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Oscilloscope can't save data to disk fast enough
I am using an oscilloscope from LeCroy and am confused as to how to have the scope sample and write data to disk at 1kHz.
When I run the
Low-Speed Measurement Data Logger Script which would make the ...
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Is there a way to set different sampling frequencies to channels in ADS1256?
In order to acquire 3 analog signals with a Raspberry Pi 4, I want to use Waveshare's ADS1256 AD expansion board (8 channels single-ended, 24 bit.)
I was wondering if there's a way to set a different ...
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29
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Send or share DI data through network advice
i want to collect some data(DIs from some relays) and send them or use them in a network and finally put them in a DataBase like SQL, and i want it to work 24/7.
after searching i found some solutions ...
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Which is more efficient: every loop or afterwards?
Planning to collect some sensor data with an Arduino (or ESP32) and looking through other people's code I noticed two variants, generally, to process sensor data.
Collect, average and subtract some ...
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Real-time vs Non-Real time ADC processing
What are the applications or Pros/Cons of using real-time vs non-real time when reading an ADC? For example, let's say you're reading a sine wave from a CT. As far as I know, if you’re processing in ...
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Why the power line interference harmonics appear gaussian?
I have a recorded signal from a data acquisition system.
I am getting this noise in my signal:
The picture shows the FFT of the signal. I checked the frequencies of the noise and they are 50 Hz apart ...
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ADS1115: Protection circuit for ADC input
I am using an ADS1115 for measuring DC analog voltage in range of 0-10V.(Sensor output range)
I am using thr IC in single ended input configuration and continuous conversion mode with FSR= 6.144 and ...
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About best way to perfom checksum
From my knowledge,checksum can be done using Xor or adding the bytes of the frame...i have to create a communication between ATmega32 microcontroller and matlab to perform some functions...which is ...
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Why isn't my PC recognizing my serial stream from my Arduino Uno?
I installed the instrument control package to Octave and have the Arduino IDE sending a single character to the computer every 100 ms. The device is transmitting on COM3 but the software still doesn't ...
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Software oscilloscope
I have been developing a C language software for software oscilloscope
which is part of a control software. From timing point of view the
software consists of two execution loops.
The first execution ...
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Settling time of DAQ 6229
i have NI 6229 DAQ and datasheet and i come up across the settling time versus time for different source impedances
i would know how is settling time calculated? i was thinking a simple RC network ...
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1
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Is there a difference between these device terms?
Is the term "High-Speed Digitizer" same as saying "data acquisition device with high sampling rate"?
The definiton I encounter for a digitizer is: " A digitizer is a hardware device that receives ...
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ΔΣ ADC Programmable Gain Without Amplifier
There are some ΔΣ ADCs of which one can set an input referred gain. Like if there was a PGA between the input and the ADC, but in fact, there seems to be no PGA between the ADC and the inputs but ...
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How to do multichannel ADC data logging
I need to build a system to monitor several (around ~20) voltages over several days. The ~20 voltages need to be measured differentially. Something which could in theory be accomplishes with 3 of ...
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Finding equation of curve for NTC type thermistor [closed]
I have an NTC thermistor from the KTM 390 engine which I am trying to interface with the Arduino MEGA. The problem is the sensor has no datasheet. I have got the relation between the temperature vs ...
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Is it a good idea to connect ethernet cable's shielding to PCB GND?
Background
My project is split over two PCBs for convenience.
The first PCB adapts an input signal and converts it to a low-voltage differential signal. There are 4 channels to be measured, so 4 ...
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Why is this load resistor connected this way and what could be its value?
There is a potentiometer vane and the diagram includes protection components and looks messy, I simplified it by re-drawing as below:
The circle R1, R2, R3 and the gap represents the vane's 10k ...
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Need a method for synchronization of galvanically separated microcontrollers
I would like to get some ideas for my problem. I have a HW which has a main processing unit (Beaglebone, host controller) which is connected to four galvanically seperated STM32 microcontrollers. All ...
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Why Do Pipeline ADCs have an "Overlap Bit"?
In pipeline ADCs, there is an amplifier after each stage that amplifiers the remainder of the previous stage by 2^(number of previous stage bits - 1). For example, if the flash ADC in the first stage ...
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How Can the Quantization Noise of an ADC be Measured using the Digital Output?
The ADC quantization noise is the error signal generated by rounding the sampled analog values of signal. Suppose that we have the digital output of an ADC, how can we measure the quantization noise, ...
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Sharing a single ground wire across multiple RTDs
Consider the following, simplified schematic for a single, two-wire RTD sensor:
simulate this circuit – Schematic created using CircuitLab
The two wires from the RTD sensor plug into pins 1 ...
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ADC / data acquisition board - general layout question
For one of my current projects, I am designing a small data acquisition board.
However, I am currently not sure about the overall layout of the board.
Here are 2 possible variants I came up with. ...
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