The data tag has no wiki summary.
0
votes
1answer
40 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 ...
-1
votes
1answer
78 views
Calculating the peak source data rate [closed]
For an exam I am soon to sit there is a question I have no idea how to answer, it is in past papers but there is no explanation to work it out in our lecture slides. The question is:
A company ...
1
vote
3answers
105 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
135 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. ...
0
votes
1answer
94 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
53 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
108 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 ...
-2
votes
1answer
50 views
Choosing a good 4+ pin connector/cable for connecting AVRs [closed]
I'm working on a project where I2C and power is passed between multiple devices and am trying to select a good choice of connector/cable to use between devices which will be daisy chained.
The key ...
9
votes
1answer
143 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
103 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
204 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
46 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 ...
1
vote
1answer
67 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
56 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
204 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
137 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 ...
4
votes
2answers
111 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, ...
2
votes
2answers
114 views
Algorithm for value range mapping
My question perhaps belongs to general ability test or something like that. It is not directly related to Embedded devices.
I have been given a variable resister which can rotate infinitely and is of ...
-3
votes
1answer
72 views
Set top boxes - database of ‘tv programme/channel’ [closed]
I am currently researching the construction and functionality of set top boxes for services such as Sky + and Freeview.
I need to understand if and how a database structure would be used in terms of ...
-5
votes
2answers
681 views
msp430 - adc data to sd card
my question is to establish a connection between sensors and MSP430 with the ADC pins. Then taking those data to store it in SD card. SD card is in SPI mode. I want to graph these data on Excel or ...
6
votes
3answers
244 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 ...
3
votes
2answers
128 views
Can someone tell me what this datasheet is trying to tell me?
This datasheet is for an audio delay IC that i plan on using:
http://www.ti.com/lit/ds/symlink/tpa5052.pdf
I understand everything pretty clearly except some important details that i've circled in ...
1
vote
4answers
1k views
How data is stored in memory beyond 0s and 1s?
I am working as software Engineer. As far as I know the data being stored in memory (Either HARD Disk or RAM) is 0s and 1s.
I am sure beyond 0s and 1s there are different ways data being stored in ...
2
votes
4answers
658 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 ...
1
vote
2answers
115 views
D flip flop data extraction
How do you get the data out of a d flip flop? On wikipedia it says that if the clock is non-rising then it ouputs Q. Isn't the clock always non-rising if it's not changing the data? If it is, then ...
0
votes
1answer
355 views
BNC camera computer interface
I have some security cameras who's only interface is a BNC connector and I want to use them to do video processing. I want to find a simple way to interface a BNC camera with my computer so that I can ...
0
votes
1answer
271 views
Communication between modules over USB using a uC
I have a module (say A) which sends data serially to me at 5 Mbps. I want to transfer this data to another module (say B). For B, I have a few choices for links: USB, UART, PCI/E, etc. I am not sure ...
1
vote
1answer
219 views
Why i can't recevied data from pc to arduino?
I developed a app that send data for arduino by serial port, but i can understand how i can recevied in arduino. Because i send a string by serial port for arduino and the arduino recevied anything ...
5
votes
1answer
659 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 ...
5
votes
2answers
324 views
What exactly are 'pins'?
I actually ran into this question just a few moments ago:
http://serverfault.com/questions/12025/intro-to-laptop-hard-drives
The first answer is the one that caught my attention.
Apparently, there ...
0
votes
1answer
139 views
Calculating the distance between 2 stations in a transfer [closed]
Station A sends \$1024 \times 10^{6}\$ bits of data to station B over a 1Gbps wired link. Station A sends the data in packets of \$8 \times 10^6\$ bits. The whole transfer took 100 seconds to ...
4
votes
1answer
959 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 ...
1
vote
2answers
2k views
Relationship between sampling rate and number of levels/bits in PCM
It is said in the books that increasing the levels of quantisation codes in Pulse Code Modulation, or in other words increase the number of bits, could give a better signal.
I understand that having ...
2
votes
3answers
247 views
Where should an increase in harmonic frequencies go in the Nyquist formula?
From the Nyquist formula that \$ Capacity = 2 \times Bandwidth \times log_2(L) \$, where \$L\$ is the level the signal represents, the total number of possible bit combinations the signal can ...
7
votes
3answers
2k 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 ...
2
votes
4answers
1k 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 ...
-1
votes
1answer
353 views
What are Discrete and Continue Frequencies?
When it says "Periodic Digital Signal is composed of periodic composite analogue signal with infinite bandwidth with discrete frequencies" and "Non-periodic Digital Signal is composed of non-periodic ...
4
votes
2answers
793 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 ...
1
vote
4answers
212 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:
...
6
votes
3answers
517 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 ...
0
votes
1answer
1k views
Ipod/Iphone/Ipad cable hack
Has anyone hacked an IOS cable and knows what data is going in and out of which wire. Maybe a diagram of an iphone cut cable?
4
votes
5answers
231 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 ...
11
votes
7answers
667 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 ...
-1
votes
1answer
79 views
book and document suggestion [closed]
I opened an old RC car controller up with some anticipation. I hoped to control the RC car by computer, by smart phone, embed a camera, send data to computer for processing it and make the RC car ...
4
votes
4answers
613 views
power for POV display
I want to build a litle POV display, but I didn't get how the power (and if possible a communication line) are transmited to the spinning part.
I've looked at some POV project but they usualy ...
4
votes
3answers
585 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.
...
3
votes
4answers
2k 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 ...
1
vote
3answers
858 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 ...
1
vote
4answers
627 views
Can a cheap, low bandwidth, long-distance wifi be physically and electronically possible for public use?
Since facebook and all the social media warfare, I have realized that the internet is awesome, but not very scalable to embedded devices: new generation network standards are still expensive to make ...
12
votes
4answers
4k 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 ...
