Exchange of information between devices. Communication can be wired or wireless.

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55 views

Which serial protocol or encoding scheme does this scoreboard use?

I am trying to decode a signal stream coming from a Nevco scoreboard controller: Packets like this are sent every ~2.7 ms. I suspect it is some sort of UART signal because it is on the RX line of ...
1
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1answer
50 views

Communication between FPGA and OMAP 3530 using GPMC

I am working on a project which requires communication of data between Xilinx Spartan 6 FPGA (XC6SLX45T-2FGG484) and OMAP 3530, I have a ULK dev board on which The 32Kx8 (256Kbits) serial ...
-3
votes
1answer
69 views

Which modulation does radio walkie talkie work on? [closed]

On which radio band does walkie talkie work on? Is it amplitude modification, frequency modulation, or short way modulation?
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0answers
32 views

What is the walkie talkie radio frequency range [closed]

What is the radio frequency on which any walkie talkie works on?
-1
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0answers
36 views

Wirelessly distance measurement? [closed]

I am trying to measure an object less than 30 meters away with relatively high accuracy. the environment may be somewhat un-predictable (outdoor, obstacle etc), what are some of the best options out ...
4
votes
3answers
67 views

Is the CAN bus protocol a master and slave protocol?

I am investigating if the CAN bus will work for the projects I am building at the moment. I want to create a bunch of input/output controllers that will accept/buffer commands, execute them and then ...
0
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0answers
39 views

Poweline Communication? [closed]

I want to implement power-line communication over the area of up to 100 sq.meters. to establish intercommunication between up to 100 devices with the rate of several kilobytes. I studied different ...
10
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2answers
549 views

How much power do I need to transmit a radio signal through a solid ice crust 100 km thick?

Imagine I put a floating probe inside the subglacial ocean of Encelado or Europa: how much power should my radio have to be able to communicate from external surface with the probe? Or, in different ...
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3answers
168 views

the causes of Fading of signals

I have read about fading of signals , and I have notice that the major cause of fading is multipath , but I have ask myself , what about attenuation , noise and free space loss , all of these make the ...
1
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3answers
64 views

the implementaion of communication systems [closed]

I wonder , Why when we study communications systems , we just study the theoretical part(Math) , and we never touch the electrical circuits that used to implements this systems , I have asked my DR. ...
0
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1answer
60 views

Controlling an ATmega328P via Wi-Fi

I am a software guy who hasn't been under assembler level. I have a project in my mind but I don't have sufficient knowledge on electronics. I have been searching in the internet for help, but I ...
1
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1answer
30 views

AT+CNBP command for SIM5216E cellular module [closed]

I am trying to use the the simcom AT command set to change the preferred band on my "SIM5216E" module. I know I need to use the AT+CNBP command, but I am unsure of what code I need to enter to select ...
35
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7answers
6k views

Why aren't headphone jack shaped plugs used for data?

With Apple's lightning cable, and USB 3.0, reversible cables are taking off, and I personally think this is very convenient. But we have had better than reversible for a long time, in the form of the ...
2
votes
1answer
165 views

LIN-communication between two STM32F4 with a standard LIN-transceiver (Hello World)

I have the following circuit connecting two stm32F4 via the SN65HVDA195-Q1 LIN-transciever. simulate this circuit – ...
0
votes
1answer
54 views

Why Direct Broadcast satellite is interrupted by climatic conditions?

Television signals received through direct satellite service are mostly interrupted by the climatic conditions. But other communication systems that uses satellites are not that much affected. Why is ...
-1
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0answers
64 views

Use IP Camera as router

I'm trying to build an RC spy car controlled over Android and I was thinking if I can use the IP camera I'm planning to use to send images to the Android device as a router for the board I built..The ...
1
vote
2answers
66 views

Does a general computer port or accessory exist which can capture a custom 100 KHz digital signal? [closed]

A device I need to study transmits a very clear rectangular signal, which doesn't conform to any standard communication protocol (UART, SPI, I2C, etc.) The voltage is not a problem, I can make a ...
1
vote
1answer
55 views

DSB-SC modulation circuit

I have the following circuit which is used for DSB-SC modulation but, I can't understand Why we use High Pass Filter(I expect to be High pass filter , I'm not sure with that ) at the carrier ? Why ...
2
votes
1answer
55 views

The options for communicating sensor data in a medium size building

What are the options for communicating sensor data to a central point in a medium size building? I want to build a cheap centralized temperature control. In each room there are about 4 radiators ...
1
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1answer
78 views

What is this Circuit's function? Does it involve Isolation?

My question is: Does this circuit isolate the "X Volts" lines from ground (1) If not, how should I implement an opto-coupler to provide isolation between the data lines ("X Volts") and ground? ...
0
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0answers
48 views

How to set up communication channel between a PIR sensor and a computer

I need PIR sensors to send data to my laptop, preferably over wireless. What are the components I need to buy? How do I set them up? Here's the background of the problem: I want to deploy PIR ...
1
vote
3answers
127 views

Drawbacks of using single-ended communication over differential pairs

I recently bought a ZYBO FPGA board only to find out that there are exactly six regular single-ended GPIO lines wired to the FPGA. In contrast to that, 18 differential lines are available. The board's ...
-1
votes
1answer
72 views

Arduino Uno - XBee communication

I have two Arduino UNO, two Xbee shield, and two Twi Xbee (type XB24). I am very new to xBee and my question is: Can I communicate each other via Wi-Fi ?
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2answers
310 views

Sending data from PC to micro-controller

In my Graduation project I need to send data from computer to microcontroller to control the position of a stepper motor Most of the examples I have seen use the legacy parallel port. unfortunately ...
3
votes
3answers
104 views

How in CDMA mobiles receiver gets unique code to decode its respective signal?

Transmitted data in CDMA mobile is encoded with a random code. Receiver requires this random code to decode data from the received signal. From where the receiver will get this random code?
1
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1answer
75 views

Frame size range calculation for stop-and-wait protocol

I have a question and answer below. The answer seems to show less working on how it derived. My question is if the efficiency of at least is changed to say 60%? Will it still be the same answer? ...
0
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0answers
68 views

Effective data rate calculation

I have two set of questions which I'm not sure if the question two answer is correct or not because I do not have the formula. I have show my working below. Q1: Study the transmission of 200 ...
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3answers
54 views

Bandwidth and wire parameters

Does the physical features of a wire like surface area, length or specific resistance form any sort of limit to the bandwidth of signals that can be passed through that wire?
0
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1answer
57 views

Connecting 4 devices on RS232

I have two PCs (very old, without usb but rs232 port) that talks via RS232. They send to each other very small bit of info ( one character every 10sec). Now I need to connect additionally two sensors ...
0
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2answers
82 views

USB to USB data transfer using microcontroller [closed]

Is that possible that we can communicate two USBs,I mean data transfer between two USB without PC ? My friend told me that we can transfer data between two USBs using different controllers. How we ...
0
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0answers
38 views

16 QAM input data frequency?

I am simulating 16 QAM transmiter and reciver in MATLAB , using randint() function to generate input data stream. But I dont know what is the frequency of these input bits generated by randint() ...
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4answers
199 views

Are wireless links symmetrical in practice?

From the top of my knowledge in the theory of EM propagation, two antennas show the same gain if used to transmit from A to B or ...
1
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2answers
216 views

Signal jammer vs scrambler [closed]

From what I understand, both of these things inhibit electronic devices from communicating with each other. A scrambler does this by altering the signals sent out by the transmitter device in such a ...
-1
votes
2answers
185 views

Arduino-Arduino RF Communication, key needs to be pressed several times

I'm communicating two Arduino i.e. Arduio UNO as sender & Arduino Mega as receiver via RF-433 MHz transiver module. Communication is sort of working but there is one problem. If I want to send a ...
0
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1answer
113 views

Why do we use (0,+V) in digital electronics (eg processors) instead of (-V/2,+V/2)? [closed]

Would making the default voltages for 0 and 1 where relevant +|- V/2 save 1/2 power?
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2answers
115 views

Land line circuit suggestion / DTMF project

I am hoping to make a system that I can call in and using DTMF chip can control few things. I don't want to use a cell phone so it has to be a land line, however, it has to be automated so when the ...
0
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0answers
127 views

Multiple Choice questions about WLAN

We were given some multiple choice questions on WLAN technologies and with the following three ones I have some problems: According to 802.11 the hidden station problem is solved by access points ...
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3answers
155 views

Serial COM Network + Arduino

I am new to this site, but I have got a problem and You might be able help me out. I have got a car cluster which talks and listens to a 0V/+12V serial line. My goal is to send some extra commands to ...
1
vote
1answer
47 views

MIMO with STBC example - How to derive SNR?

Conosider 2 x 2 MIMO system with the channel matrix H : $$ H = \begin{bmatrix} 1&1/2\\ 0&\sqrt{3}/2 \end{bmatrix}, $$ and transmit signal matrix S : $$ S = \begin{bmatrix} s_1&-s_2^*\\ ...
1
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1answer
65 views

High speed communications on a lower speed controler

I am new to electronics, I'm trying to get my head around this concept. As I understand it, on any processor, you will be able to switch an output on or off, at a rate no faster than the speed of ...
5
votes
3answers
660 views

Difference between a bus and a wire

I have been studying buses used in communication systems. From what I read at Wikipedia, "In computer architecture, a bus (from the Latin omnibus, meaning "for all") is a communication system ...
-5
votes
1answer
64 views

Is it possible to “record” an electric signal sent from a PC motherboard to the old “buzzer”? [closed]

First of all, sorry if I use the wrong terminology. I would like to know if it's possible (and how) to record the signal that a motherboard sends to the buzzer (the internal speaker), so that I can ...
0
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0answers
39 views

sending data with cc2510

Hy, I'm trying to send simple 1 Byte package with cc2510dk-mini. The idea is to press button on on device and the led on the other lights up. I'm stuck with the problem, when I try to send data, radio ...
4
votes
2answers
264 views

Implementing Control Commands for an MCU over Serial

Im looking to integrate a command interface in a project that im making that will accept commands overs serial from a PC. The idea is that the device will do its thing but it gets sent a command, it ...
5
votes
2answers
148 views

Does Nyquist rate depend on the sampling rate?

The book Computer Networks by Andrew S Tanenbaum mentions the following (paraphrased): For a noiseless channel, Nyquist theorem states: Maximum data rate = \$2H \space log_{2} V \$ bits/sec ...
0
votes
1answer
112 views

Connecting phone using copper power wires

I want to install a video door phone (intercom) in my home, for this I have done a pre-wiring of 4 individual copper wires (normally used for home electricity) and the total length of wires is about ...
1
vote
2answers
496 views

Interface of XBee module with ATMEGA 168

I have configured 2 xbee series 1 modules such that one will receive serial data from any other module of same pan ID and the other will send data to the previous mentioned one. Now when I use a ...
2
votes
2answers
77 views

How to “auto-disconnect” from rs485 bus when power off

I have many devices on a RS485 bus. When I disconnect power from one device, the rest of the (powered-on) devices seem to communicate with each other just fine. At least it seems to be working today. ...
0
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2answers
167 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. ...
2
votes
1answer
164 views

Correct USB to RS 3.3 / 5.0 logic level cable

I am starting with electronics / arduinos / atmegas here. For a couple of recent days I've played with USBasp programmer, atmega328P MCU as well as with 7805 and LM317 voltage regulators. Now my next ...