Questions tagged [data]

Data are values of qualitative or quantitative variables, belonging to a set of items

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Is there a database containing typical transistor data and characteristics? [closed]

I guess the title says all, but basically I'm looking for a searchable database on typical transistors' data. Such data would ideally be arranged like: ...
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AXI race condition, read then write [closed]

I have 2 scenarios There is a write request and then a read request to the AXI bus. I am getting old data. (The read request is before the write response.) There is a read request and then a write ...
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Hamming code question

Suppose we have m data bits and n parity bits. In order for the Hamming code to function: $$m+n<2^n-1$$ If we have 3 parity bits we can have up to 4 data bits. But lets say we don't have 4 data ...
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Instrumentation Tools for Collecting Data in DRAM accesses

We can use instrumentation tools, such as Pin tool, to collect memory accesses of an application running on a system. The type (read or write) and memory address can be collected. How about data? Can ...
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2 answers
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Send float with Serial Port

I'm trying to send float temperature data from stm32f103c8t6 to qt application. When I try tosee value with Keil I can. But When I try to transmit to App I got some error about convering uint8_t to ...
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Transcieving 125khz rf signal

Does anybody know if it is possible to connect a coaxial cable to the tx rx pins on a wireless module ? I am trying to send data via coaxial RG58 cable. Or would a twisted pair be more suitable? I ...
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1 vote
1 answer
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Sliding window protocol

In the sliding window protocol when the receiver sends RRn to the sender the receiver's window is shifted to the right now starting at the n position correct? Suppose this is the window of the ...
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Reading data off a watt-meter comm. port

I have a no-brand Watt meter with an unlabelled 3-pin port at the side, presumably for reading the data off it. Pic: https://imgur.com/a/IuxEUh3 Ebay listing: https://www.ebay.com/itm/154741876757 ...
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Timing Arduino response with ADXL345 accelerometer's data rate

I'm currently working on a system that calculates the velocity by integrating the values of the acceleration. I'm using the ADXL345 accelerometer with a ESP32, and so far, everything's going good, i'm ...
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How to get RMS voltage and frequency from datapoints read from an ADC?

I have an ADC that samples 4000 times per second or 0.25 ms interval per sample. I would like to extract the RMS and frequency value of the signal being read. How do oscilloscopes and multimeters do ...
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How to reconstruct phase data from magnitude only data in a frequency domain function?

I'm trying to do a reverse-engineering a software called LEAP from the now disappeared LinearX company. This software can perform an operation called "Minimum Phase Transform". This takes ...
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-1 votes
1 answer
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UTD 2052 oscilloscope: read data from .sav file

I just recently got an oscilloscope and was happy to try it out. Now I have a problem with reading the data. The model I am using is the UTD2052 50 Mhz scope. I can save the data to a USB drive in the ...
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11 votes
9 answers
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Best way to store very small amount of data?

I'm building a side project at the moment and I want to be able to store and retrieve a very small amount of data (10 kB tops). If the power is disconnected I want to be able to retain the data. I ...
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1 vote
3 answers
80 views

Bandwidth of signal

What exactly do we mean the signal bandwidth is the range of frequencies the signal is made of?Is this referring to the Fourier transform of the signal in the frequency domain?
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2 votes
1 answer
153 views

How decode serial data stream

I am trying to decode a data stream. This signal comes out of an STC 8H1K16 micro-controller. It is from the pin labeled TxD is the picture. When I trigger the signal I am trying to understand I get ...
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2 answers
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Adding two termination resistors on the same node?

Can someone please explain to me why this is the wrong way to set up a CAN bus? When I measure the resistance between CANH and CANL I get 60Ω, so why must I put the termination resistor on node 2 when ...
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28 votes
4 answers
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How much data could be stored on a standard compact cassette using modern encoding?

My father and I recently dug out his old Commodore 64 from his basement and tried to revive it. Among other accessories, we also found his old Datasette drive, which is essentially a normal tape drive ...
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Where can I find the format specification of a spice3f5 data dump?

I am using ngspice command write to write a data dump of simulation results. I want to use this binary format because presumably I can preserve precision. I can ...
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Average lifespan of typical project box LEDs widely available for purchase [closed]

I tried searching for this but I just get light fixture LED information. I'm trying to determine the expected lifespan of a typical small LED like you'll find in electronics kits or hobbyist stores. I ...
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2 answers
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Embedded C++ save and restore data

I am working on an embedded C++ project. I am dealing with complex and dynamic objects with lots of objects pointing to one another. I need to store and recall these objects to non-volatile memory. In ...
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3 answers
239 views

Configuring SPI circuit design for use in 485 transceiver for long range data transmission (50 meters plus)

So quickly getting out of things I have previously done however trying to send SPI controller signals across long ranges using either 18 AWG cable or based on all the recommendations we have been ...
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1 vote
2 answers
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What is the best LED driver to use for this setup - Help with WS2815 data amp over long lines

Currently have 5 m WS2815 strips installed running from 18 AWG wiring connected to 12 VDC Meanwell power supplies and our controllers (SP108,SP102,SP608), power injection on all lines. When we tested ...
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Amplifying long run wiring to addressable WS2815 LED 12V to pool line noise issues [duplicate]

I amurrently working on running WS2825 IP68 lighting (finishing up) in our pool along with LED lights. After moving the controllers to a centralized location, we have been having issues (lights ...
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-2 votes
2 answers
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Missing and insufficient data read from embedded BMP180 pressure sensor in motion [closed]

We're building an avionic system which will fly onboard on our rocket. And we have embedded BMP180 Pressure Sensor on our avionic system and we want to get smooth data when it is moving. Our BMP180 ...
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33 votes
14 answers
10k views

What makes the stack concept useful in embedded programming?

Below is an illustration of the stack concept: I have read many times about the stack pointer and how some variables are stored in SRAM on a stack. Many tutorials explain how it works, but not why ...
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24 votes
6 answers
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Could data transmission power consumption be lessened by transmitting more zeroes?

According to the IEA 250 TWh of power was consumed in 2019 due to data transmission globally, about 1% of worldwide electrical power use. I would like to pose a very simple question regarding power ...
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Random Voltage Spikes Reading From ADS1115

so I have a pcb circuit that uses a Raspberry Pi, ADS1115, BME280, and a TGS6810 sensor to detect natural gases. The circuit seems to work perfectly and I am able to see clear curves when I plot the ...
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1 answer
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Crystal Oscillator

What are the markings mean on this crystal that I found on a motherboard? Thanks.
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How do I ignore the content in a txt file while plotting on Matlab?

lovely friends! The file in my impedance measurement data is in.txt format, with a title and numerous comments written on it. When I try to plot the data in Matlab, I get an error, which I assume is ...
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3 votes
4 answers
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How to collect data from LTspice

I am trying to collect data from a circuit and use that data for a regression analysis to get results. For my analysis purpose, one input needs to have different output (as the circuit I am using is ...
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-1 votes
1 answer
115 views

How is data transferred through wires? is it [5,0] volts (DC) or is it [1,-1] volts (AC)?

So basically I am learning about how data is transferred through wires for a networking course and I stumbled upon this Ben Eaters video on this topic and I got a bit confused because I know that ...
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Difference between Li2YCY and LiYCY

I would like to ask about the difference between Li2YCY and LiYCY TP cables. As far as I know, the main difference is that the Li2YCY has core insulation based on PE and wrapped screening made from ...
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-3 votes
6 answers
143 views

Is binary data in actuality a range of high and low to mean each in Computer Science [closed]

I do understand why 1 and 0 are used and why we have to make two states for data transfer storage and the rest. And why those two symbols and not off and on or some other means. It was most efficient ...
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1 answer
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How information is collected from a photographic sensor

For example, you have a sensor measuring temperature, light intensity or anything else. You have microcontroller reading your data and a sd card to save your data. I can understand how you can ...
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Algebraic Data Type

I understand the concept of algebraic data types, but I don't see in what context they are useful or when they would be beneficial. When should I consider using them and how are they useful in ...
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1 vote
2 answers
80 views

Why do we use a low resistors on Data lines for an ADC for example or a clock?

Why do we use a low resistors on Data lines for an ADC for example or a clock ?
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1 vote
1 answer
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MAX233 problem with receiving data

I need to make serial connection between regular PCs and a 3.3v TTL device, I using the Maxim 233 which has internal capacitors. I have the PCs incoming TD connected to R1_IN and RD T1_OUT. The ground ...
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0 answers
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How can I simulate microwave radio link transmission?

My task is to simulate a two-way data transmission microwave link. The fixed parameters are distance, transmitter power, carrier frequencies, bandwidth, receiver noise figure, intermediate frequency, ...
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2 votes
2 answers
105 views

The results of my magnetic flux data from voltage recorded

For my electrical engineering senior design I created an experiment to test magnetic flux (more voltage) through a receiving coil. There is a large sending coil with A.C. voltage and a small receiving ...
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2 votes
1 answer
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MQ-4 sensitivity characteristics - raw data

I need to convert Rs/Ro ratios of my MQ-4 sensor to PPM. For that I found the sensitivity plot in the datasheet (https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-4.pdf). However that is a pdf ...
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0 answers
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Data transmission through multiple IoT devices

We are implementing a device which will have multiple sensors inside multiple houses in our local area. Each house will have 1 device fixed at a place and data will be transmitted to one central ...
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1 vote
2 answers
162 views

Should I double data or power lines for UART device

I just have a quick question. I'm connecting PN532 NFC reader with RPi, for this I am using around 30m of UTP cable from my front door to rack with RPi, preliminary test showed the device is able to ...
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0 answers
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Leaky Bucket Example

I have an image below of a leaky bucket image that I am trying to understand for my telecommunications class, and I was hoping for some guidance/verification if my train of thought is on the right ...
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Connecting a smartphone android camera while charging the phone

I am hoping for advice. I have a android camera (the same as in this video: https://www.youtube.com/watch?v=AvWIp5vtsEU) and want to connect it to a Sony phone to see if I can use it as a streaming ...
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1 vote
0 answers
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FPGA Connections

Im a senior EE major whose going into their senior design project. In the past Ive always struggled with data and computer systems. But as luck would have it that's what my senior design project is. ...
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How to calculate how much voice channels is being multiplexed

I would like to know how I could calculate from the bitstream which has a bitrate of 2,048 Mbps into how much voice channels is being used. I know that the syn has 32 bits and sign is 16 bits. Bitrate ...
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What are odd-even memory addresses in 8086 and how do they work? [duplicate]

I have recently started to look more into microprocessors at the hardware level, and i am a bit confused on what are the odd-even memory locations that 8086 uses. As far as i understand, it has ...
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0 votes
1 answer
83 views

How do modern CPUs treat memory operations? [closed]

How does a modern CPU treat memory reads and writes on the hardware level? With old 8-bit architectures all memory locations are read and written to one byte at a time, but how do modern CPUs that ...
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0 votes
2 answers
127 views

How do I turn off multiple data connections with a single switch? [closed]

I am pretty new to electronics but so I've been doing a lot of reading and whatnot. I have a question I can't seem to find any information on. I am modding a handheld device (the device in question ...
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1 vote
1 answer
82 views

using mcp3008I/P adc with raspberrypi

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