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Questions tagged [data]

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

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 ...
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 ...
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 ...
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 ...
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. ...
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 ...
11
votes
3answers
2k views

Flexible-PCBs: what data is needed for manufacturers?

Can someone explain more about how you generate data for flexible or flexi-rigid PCBs for manufacture? Do I just make more layers and export more gerber files? Is there anything I need to keep in mind ...
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 ...
10
votes
4answers
2k views

Avoiding confusion between no input and a zero in binary?

Suppose I'm transmitting data through FM where 0 is 2Hz and 1 is 4Hz. The transmitter is transmitting 2Hz when there is no input. If I fed the recieved binary to a UART port of a microcontroller, how ...
10
votes
1answer
868 views

Basic protection for USB interface

I have never protected my USB interfaces for microcontrollers until a USB port of my PC stopped working because of a bad connection aparently. So I'm starting to protect them but I found some ESD IC's ...
9
votes
6answers
3k views

Is it necessary to separate DC power cables and data cables?

I have had this discussion with my colleague earlier. A DC power supply is non-alternating, so the magnetic field a DC power wire generates is constant (is it?). Now, I know the rule is to separate ...
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 ...
9
votes
5answers
2k views

Why don't we use 7075 aluminum Ethernet and USB cables?

Since the skin depth of copper at 1Ghz is about 2.3 micrometers, it doesn't seem like aluminum would provide a worse signal to noise ratio. 7075 aluminum is also much more resilient and stronger than ...
8
votes
3answers
243 views

Theoretical Clock Question

Just a theoretical question more than anything. Does the clock signal have to have the same width between peeks and troughs? A normal clock signal with data (below): A random clock signal with data (...
8
votes
1answer
6k views

What should I know about interference between wires in a multi-conductor cable?

I want to use a multi-conductor cable for a few different circuits. What do I need to know about interference between circuits within a multi-conductor cable? Some of the wires will carry stepper ...
6
votes
6answers
5k views

What kind of options are there for very high bandwidth long distance data links?

I'm considering a future product. A high definition (720p) video transmitter. Ideally a compressed MPEG link would be used but this would still require at least 80 Mbit/s. I'm not looking at a simple ...
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
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 ...
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
2answers
310 views

Is there any possibility of dissecting a microchip to get data from its internal memory?

There are many devices that perform various cryptographic operations inside their microchips. One of their key feature is that the secret keys are stored inside of the hardware and never leave it. ...
6
votes
5answers
8k views

DSC Keybus Protocol

I'm plan to interface a atmel avr with my alarm system in home but the issue is DSC has a propriatary protocol between the keypad and the base. So has anyone messed with this before or can give me a ...
6
votes
1answer
278 views

Olympus TG-Tracker : What does this data stand for?

I'm sorry if this comes to wrong forum, but here goes. I got this new action camera which tracks the following kind of data (edited): ...
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 ...
5
votes
5answers
450 views

modem free high base AM data transfer possible?

not a very experienced EE, but I was thinking about a system for high speed data transfer, and it is fairly simple conceptually, so I imagine that there must be serious flaws with the method, because ...
5
votes
3answers
4k views

MCU: saving data directy on flash. What's the advantage?

I know on some MCUs its possible to save data directly on program memory (flash memory). AVRGCC compiler uses "PROGMEM" keyworkd, MPLAB C18 uses a similar one with the same effect. However, what's the ...
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
3answers
2k views

Safe Powering Methods - Working with Children

I'm carrying out a research project this year at uni, which will include creating small electronic sensory devices for children (under 7) with autism. Obviously, safety has to be taken very seriously. ...
5
votes
3answers
497 views

Has anyone transmitted data across a badly coupled transformer and recovered the data correctly

EDITED June 9th 2013 to give more detail (hopefully) I've recently set-up a data transmission system on a rotating machine. The data was collected and serialized from several ADCs connected to strain ...
5
votes
2answers
815 views

Ethernet shielding termination

With regard to termination of ethernet shielding I have been taught always to terminate only ONE end of the shielding to ground to prevent ground loops occurring. Is this best practice? and is there ...
5
votes
2answers
3k views

Continuously log data from an oscilloscope

I have a pin which is being toggled every 100ms by an MCU. I need to plot a graph which consists of the variation from the desired interval . That is the number of times it moved away and was toggled ...
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 ...
4
votes
7answers
1k views

How can I collect data from a hydrophone?

I want to collect data from a hydrophone over a period of days or weeks. A desired typical collection period would be 30 days. Hydrophones are a piezo-electric transducer that output millivolts (...
4
votes
2answers
2k views

What data format do audio cassettes use?

How do the sound pressure values correspond to the magnetic domains on the tape? Is the format analog or digital?
4
votes
4answers
799 views

ADC resolution selection

I want to convert analog output of an accelerometer to digital codes. I understand that the sampling rate of the ADC should be with reference to Nyquist criteria. Please let me know how to decide ...
4
votes
3answers
12k views

Why all digital signals have infinite bandwidth?

Why digital signals have "infinite bandwidth"? Frequency is the number of cycles per second. I have seen before the formula that bandwidth=Maximum Frequency - Minimum Frequency. I remember I was told ...
4
votes
2answers
2k views

How does a ps2 mouse send data to a computer? [closed]

I want to read data from a mouse with the help of Arduino. I want to calculate relative motion between two objects. My questions are 1) Is it possible? 2) How is mouse interfaced with Arduino?
4
votes
2answers
1k views

What are the most common data storage devices in small consumer electronics?

What are the standard ways of data storage in small consumer electronics (routers, phones, etc.)? For simple devices I guess microcontrolles with in-system programmable flash are enough, but for ...
4
votes
2answers
1k views

Salvage data from a reverse connected thermocouple?

My SAE Baja team had a competition this past weekend, and we were using some thermocouples in order to get some temperature data on the drivetrain and engine. They were hooked up right before the ...
4
votes
3answers
5k views

2.5mm Jack to USB data Cable

I was recently diagnosed with Type 1 diabetes. With the need to test my own blood upwards of 8 times a day I have a ton of data to keep track of. My testing unit has the ability to upload its data to ...
4
votes
2answers
2k views

Saving data in Code Composer

I have a circular buffer in my code (TI 28027) saving around 500 data points. Is there a way to easily save this data to a text file in Code Composer 4? Right now I am just using watch window, ...
4
votes
1answer
14k views

Required Bandwidth for ASK

In Amplitude Shift Keying, the bandwidth required is given by \$B=(1+d)S\$ where B is bandwidth, S is the signal rate, and d is a value of either \$0\$ or \$1\$. But how could the required bandwidth ...
4
votes
1answer
101 views

What determines the frequency of network cable

You have Cat6, 23 AWG, rated for 250Mhz frequency. You then have Cat6a, 23 AWG, rated for 500Mhz. Both are unshielded. How is Cat6a able to transmit data at a higher frequency then its counter part? ...
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 ...
3
votes
4answers
4k views

How often does “bit rot” occur?

I have been thinking about the permanence of information lately and I was wondering at what rate a bit on a consumer spinning disk hard drive is corrupted and what are some factors that speed up or ...
3
votes
4answers
352 views

Bit/data stream unknown. How to figure out?

I have taken apart a digital weight scale and on the circuit are two pins labelled 'test'. When connecting this to the soundcard of my PC I can see it is a digital signal (high/lows), but I don't know ...
3
votes
2answers
491 views

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

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 ...
3
votes
1answer
3k views

Calculating series resistors for I2C/SPI lines to reduce EMI and ringing

How do you determine if a series resistor is needed for I/O lines, and what value is needed? Where should the series resistor be placed? My assumption is the resistor should be placed as close to the ...
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 ...
3
votes
2answers
526 views

Dual port, serial interface, buffered, shift register

I have an "interesting" problem. The proposed design, for a system I'm working on, needs to use 16x 16-bit serial ADCs and I need to interface the results of all 16 ADCs to a synchronous serial ...
3
votes
1answer
909 views

Transferring arbitrary data via Bluetooth Smart (BLE) with nRF51

I was wondering if it was possible to send arbitrary packets of data over a Bluetooth Smart (Low Energy, 4.0) link from a nRF51 (Nordic Semi, BLE compliant SoC) to a phone? Also if you don't know the ...