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Questions tagged [data]

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

9
votes
3answers
2k views

Data retention on a microcontroller

Just reading the datasheet of the attiny13 it says that it can hold its data for 20 years at 85 degrees Celsius and 100 years at 25 degrees Celsius. Is this irrespective of the read and writes on ...
10
votes
7answers
3k views

Power for POV display

I want to build a small POV display, but how is the power (and if possible a communication line) transmitted to the spinning part? I've looked at some POV project, but they usually don't explain that ...
17
votes
4answers
12k views

How could you transfer data over an audio line?

I'd like to pass some data over an audio cable (i.e from audio card to my cellphone) with a short cable. I'm looking for some ideas for algorithms for achieving this. They of course should include ...
28
votes
10answers
7k views

Why can't Wi-Fi run at 2.4 Gbit/s?

So Wi-Fi runs in the 2.4 GHz band, yeah (and the new ones 5 GHz)? Which means that every second, a Wi-Fi antenna outputs 2.4 billion square wave pulses, right? So I was wondering, why can't ...
5
votes
3answers
5k views

Custom USB Impedance question

I'm looking at making my own USB cable for a project. The primary issue I'm having is that I'm getting a lot of capacitance in my cable between D+ and D- (400ish pF) which is enough to throw off the ...
11
votes
3answers
13k views

Can the Arduino be used to “spy” on a UART connection between two devices?

I have a need to install an Arduino (actually just the IC) into existing hardware to enhance functionality. What I would like to do is connect the Arduino so that it "spys" on the I/O lines between ...
6
votes
2answers
4k views

Best method for sending data over a mono audio channel

I'm looking for a way to send binary data over an audio channel on a video/audio transmitter. This will be an add-on feature to my product because it already has an audio interface. I'm hoping to be ...
6
votes
2answers
7k views

Is there a spice directive to export waveform data in LTspice?

http://www.linear.com/solutions/1815 The above web-page explains how to export the waveform data to a text file. You basically run the LTspice simulation, clicking on the waveform window, go to ...
6
votes
4answers
1k views

Will an SPI flash memory chip have the same issues with non-atomic write operations as a dsPIC's internal EEPROM?

A while back I had some intermittent trouble with the internal EEPROM of a dsPIC. Every so often, some value in the EEPROM would be found zeroed out on power-on. I tracked the problem down to when the ...
2
votes
4answers
797 views

What solutions, if any, are there for visible light transmission (VLC)?

I want to know what ways are there to transmit data using LED's that are available to us today. I currently can find only one reasonable resource for this topic, which is this: http://www.siemens.com/...
1
vote
1answer
4k views

USB Charge and data separate cables

Is it possible to split micro USB to USB cable so two cables (data + and data -) go to the PC with USB and two other power cables go to power brick?
13
votes
3answers
41k views

What is the theoretical maximum data transfer rate of a pair of wires in a phone cable?

Yesterday folks from my ISP came to install a 16 Mbps "Fiber to the Home" connection, but I noticed that the connection still comes in through the same two wires on our phone jack. Could that same ...
18
votes
7answers
2k views

General protocol for data transfer from one system to another?

What is the general protocol to send information from one system to another? For example, let's say we have some information collected from microcontroller over a length of time that we want to send ...
3
votes
4answers
2k views

How much binary data is transmitted across a physical wire in one clock cycle?

How much voltage change, what I'm calling binary data, can be transmitted over a wire at one time in one clock cycle? I understand, I think, binary data is what we call it and the wire doesn't really ...
11
votes
8answers
5k views

Saving data without a microcontroller?

Is there a way to save voltage data directly (without a microcontroller) to anywhere, like EEPROM, SDCARD, etc.? For example, I am using an MPX pressure sensor which gives 0V to 5V analog output. ...
5
votes
2answers
5k views

Why Periodic Signals has only integer frequencies but non-periodic does not?

Why does a periodic signal only has integer frequency values while a non-periodic one has all real numbers as frequency values? The frequency is just the number of times one full cycle has happened ...
5
votes
2answers
988 views

What exactly are 'pins'?

I actually ran into this question just a few moments ago: https://serverfault.com/questions/12025/intro-to-laptop-hard-drives The first answer is the one that caught my attention. Apparently, there ...
2
votes
2answers
288 views

Will cutting only the Power Lines damage the Data Lines or the Device?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. Will only disconnecting the Vcc OR Ground Wires damage the Connected Device or the Data Wires? I currently have a USB ...
3
votes
4answers
1k views

Data transmission through the human body

As we all know, data can be transferred through cables using electrical pulses transferred into binary codes. My question is, is it possible to transfer data in a similar manner but through the human ...
2
votes
1answer
173 views

Accuracy of a data acquisition hardware

In a data acquisition system absolute accuracy is defined as measure of all error sources as following: Abs. accuracy = error from Gain(Span error) + error from Offset + (error from Noise + ...
1
vote
3answers
3k views

Will cutting the data lines of USB still let the power to go through?

I am trying to Charge a USB connected device through a computer without transferring data. An USB 2.0 cable should have 4 wires: Vcc, Data+, Data- and Ground. If I only cut the Data wires and let the ...
1
vote
4answers
3k views

I2C combining read and write operation

I'm designing my own data protocol for communication between PICs, ICs, etc. and in the specification I'd like to compare it to the existing I2C protocol. There are two types of operation on the I2C ...
1
vote
1answer
1k views

How does USB 3.0 negotiate power states?

I noticed, in another question, a comment regarding USB power states. I know that USB 2.0 negotiated power by tying the D+ and D- lines to specific voltages but I can't seem to find any information ...
1
vote
4answers
157 views

Does computer memory record the zero binary state?

It's been two years since I started reading about electronics and computer circuits. I fell in love with the homemade computers and the possibility of building one by myself. You will see: When ...
0
votes
2answers
155 views

NAND flash retention using USB charger?

NAND-based digital flash data storage devices such as SD,SSD,USBstick,eMMC,UFS,etc. do have transistors, where the small amount of electrical charge does slowly leak over time, resulting into data ...
0
votes
2answers
319 views

How to solve electric shock issues in this system?

When I measure the potential difference between for example a 12V DC output device's one output terminal such as a power supply's or a transducer's and the "earth ground", I see 50Hz voltage signal ...
0
votes
1answer
98 views

Glitchy pulses in a data acquisition system

A single-ended -10V to +10V 16-bit data acquisition system is composed of 16 single-ended channels where two of the channels are analog outputs and the rest are analog input channels. The transducers ...