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

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2
votes
2answers
69 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 ...
0
votes
1answer
45 views

frequency allocation for telecommunication companies

For a high bit rate in data communication we need a high bandwidth. Suppose there are hundreds of carriers in a particular region and they are all allocated microwave frequencies. Minimum spacing ...
0
votes
1answer
41 views

Measuring Stress with Sensors

I wanted to ask a few questions in the hoped that someone can advise me. Basically I wish to use a sensor which will be attached to a large piece of fabric, I would then like to use the data from the ...
20
votes
10answers
5k 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 ...
0
votes
3answers
79 views

Signal to noise ratio for a non-physical property

The signal to noise ratio for a voltage, current, or power is easy to understand, but how do I calculate the SNR when the signal is not a physical property, but instead an abstract quantity? I'll try ...
-2
votes
1answer
47 views

I have a set of USB-classed barcode scanner and microcontroller board, how do I process the data?

Questions: Is the signal already readable for the microcontroller if I have both the scanner and the board match headed with USB? I know that the scanner was programmed to output whatever the bar ...
0
votes
3answers
94 views

Stereo to High Speed LED for Data Transfer

I am currently doing a project on optical data transfer using LED. The first hurdle I need to overcome is the LED driver circuit. I have little to no background in circuits. I do know a fair amount of ...
0
votes
2answers
49 views

Connecting DAQs in Parallel

I need to connect a DAQ to an existing system which uses a DAQ. The idea is to connect the DAQs in parallel so the existing system is not changed. It is likely that only one DAQ will be used at a ...
-2
votes
1answer
129 views

What actually limits the speed of a USB flash drive? [closed]

My system outputs data through USB which is to be stored in a external memory. But it seems that flash drive is not having that much speed like that specified in USB 2.0 protocol. What actually ...
4
votes
2answers
193 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 ...
3
votes
2answers
154 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 ...
6
votes
4answers
307 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
2answers
181 views

How to ensure data integrity when using I2C with a PIC

When master device transfers a piece of data, slave will acknowledge back once the data has been received by slave. So it's not possible to ensure the data integrity by only polling ACK. I ...
1
vote
0answers
46 views

Read/write pointer in a DAQ

I'm trying to built a DAQ on a CAMAC system using Sparrow's Kmax 9.5 . The devices I am using(which must be rather old) are Sparrow SCM-301 SCSI - CAMAC Crate Controler Philips 7164 ADC Hytec LP ...
2
votes
1answer
311 views

How to “Mirror” or “Split” bar code data scanned by one USB scanner to two computers using Y cable? [closed]

I have searched this site and many others looking for a way to "split" or mirror data from an USB device (bar code scanner) to two computers. We need to do a parallel cut-over from a legacy asset ...
0
votes
2answers
192 views

Transfering RS485 data to server using ethernet

I'm extracting data from energy meters like V, I, KW, etc. Now I want to put this data in a dedicated server through Ethernet LAN so that meter user can monitor data from remote place by logging in to ...
0
votes
1answer
65 views

What's the best storage method? [closed]

I was wondering about what's the best storage method to save files to in order to save it from natural dynamics like earthquakes, tsunamis, or just to keep them along times... We all know that there ...
0
votes
2answers
325 views

Does a table that shows how 8b/10b encoding tries to ensure running disparity on a transmission line

In telecommunications, 8b/10b is a line code that maps 8-bit symbols to 10-bit symbols to achieve DC-balance and bounded disparity. In this case we take each 8 bit data and map it to a 10 bit symbol. ...
0
votes
1answer
486 views

How to connect a Printer WIFI module wires to an Arduino?

+ I’m a digital artist, found this HP printer on the street and wanted to use its components (motor etc.) on my projects. I was wondering if any of you know if I can use this WIFI module to ...
3
votes
2answers
118 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 ...
2
votes
1answer
86 views

How to monitor data exchange on single wire?

I have two modules that communicate over a single wire. Where would I even start about monitoring the data without introducing any kind of interference to both modules? One of the modules has to be ...
-1
votes
2answers
139 views

Why is it not recommended to connect an output of a data acquisiton device to one of its input?

We have a DAQ board from Measurement Computing which has analog and digital outputs and inputs. It is written as a warning on it that one shouldn't plug an output channel back to the board as an ...
2
votes
4answers
157 views

Gui float data from micro controller

I am building a framework for a data acquisition system where the controller sends a (integer/float) data in to the GUI. I have done some ground work on data types and compilers and found out that ...
1
vote
1answer
63 views

Arduino data processing [closed]

I am currently looking into using the Arduino micro controller for data processing. I thought a good way for me to get practical experience and learn is make a sample application like a key logger - ...
-2
votes
1answer
81 views

Getting experimental motor data for AI based fault diagnostic scheme

I am working on a personal project, which is an AI based induction machine fault diagnostic scheme. I do not have the required funds to purchase the hardware, i.e. the motors and data acquisition ...
0
votes
1answer
469 views

How to reduce the data rate?(OV7670 + AL422B(FIFO) Camera Module)

I bought this module: OV7670 + AL422B(FIFO) Camera Module and I want to send the live video of the camera by this NRF24L01 but I have a problem. I don't know is the RF module suitable(NRF24L01) for ...
4
votes
2answers
132 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 ...
3
votes
1answer
244 views

Does forcing a data line to a higher power make it more resistant to interference?

A device I'm working on as a hobby project requires me to transmit a HDMI signal over cat5. The TMDS lines in HDMI are balanced but in order for me to continue transmitting the DDC signal with the ...
0
votes
1answer
78 views

Why to multiply all audio input with 1000/sqrt(sumsofInputSquare/datalength) [closed]

My thesis is about voice segeration. I am reading a code which has been used in this field. It most probably not needed but here is the fullCode I can't understand something which owner code did , ...
7
votes
3answers
171 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 ...
1
vote
2answers
105 views

Wireless data acquisition for PC [closed]

I’m looking for an off the shelf device to send a serial stream of data (low speed ok) wirelessly to a PC. I’m guessing the easiest way is through a comm port or USB port. Distance is less than 25 ...
0
votes
2answers
141 views

Is analog output more accurate than RS232 output?

Where I'm working they use an electronic device to calculate the exact wind speed. One of the parameters besides humidity and temperature they use is the pressure. And they measure it by using the ...
1
vote
3answers
274 views

Is it true that copying is the most CPU intensive operation?

A mech engineer said that copying puts more load on the microprocessor than "other" operations (e.g. moving data or creating the same amount of new data). Is this true? Can you elaborate? I understand ...
3
votes
2answers
269 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 ...
1
vote
1answer
135 views

What limits wireless data transfer rates (compared to wired)?

A friend and I were discussing the possibility of wireless video cables and we quickly realized that the bottleneck is the current data transfer rate of wireless technology. The average wireless ...
1
vote
1answer
126 views

Bit error rate calculations for a photodiode receiver driven from a laser

I'm having problems understanding how the following specification for a photo-diode (with built-in amplifier) rationalizes the bit error rate: - Circled in red are two important figures. One is NEP ...
0
votes
1answer
580 views

Saving user input as an array and recalling it later

I am currently working with an Arduino Mega and a SainSmart LCD and I have gotten most of my project to work except for a problem I am currently having. On my LCD screen, I have various buttons, and ...
2
votes
3answers
595 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 ...
5
votes
2answers
202 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. ...
1
vote
1answer
268 views

How to send ASYNC 8,N,1 serial data over an SPI interface using two Arduino Uno boards

Need help with sending ASYNC data between two Arduino UNO R3 micro-controllers. System design follows: RS232 modem 19,200,8,N,1 --> UNO-1 D0=(rx), D1=(tx). RS232 parameters cannot be changed because ...
-3
votes
1answer
99 views

displaying JPEG images [closed]

I want to display images(JPEG) stored in a SD card, I want the output to be VGA so that I can display them in readily available display modules. Any idea on how this can be done?
3
votes
4answers
200 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 ...
9
votes
1answer
244 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 ...
-2
votes
1answer
145 views

sniff telephone line data using old modem [closed]

i have an old modem that i'd like to use to sniff the data going out on the telephone line. i realize that i can't use the computers serial port to process the data as they are real slow. Can anyone ...
5
votes
3answers
285 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 ...
0
votes
1answer
80 views

Eco-roof flow meter with “counter channel” output - what is that?

Some background: I'm working on an eco-roof flow monitoring project and we want to hook up a Unidata 6506G tipping bucket flow gauge (our effluent flow is in a strange low range range where we needed ...
2
votes
1answer
80 views

Converting logic and sign

I have an interesting project and I could use a little help. I'm using a microcontroller who's input to the ADC and output on the GPIO and DAC pins are all within a 3.3V range, and I have to interface ...
-2
votes
1answer
70 views

Data recovery Baby-G watch (BG-162)? [closed]

I was wondering if it is possible to recovery data that was stored in a Baby-G watch (BG-162) which had no battery in it for two years or longer? No current was flowing through it, I lost it's joint ...
0
votes
4answers
413 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
2answers
164 views

Value of M-Ary?

Here, I want to simulate an M-ary [pulse-amplitude modulation] system. Anyhow, I chose my binary source to generate information at a rate of 1Mbps. The data "virtually" has a zero intersymbol ...