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

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0
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3answers
36 views

Is a multiplexed signal same as a composite signal?

Used to StackOverflow, this is my first question here. So please bear with me if the question is too simple and obvious to you as I am not good in Electrical Engineering stuff. I really need to ...
0
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1answer
26 views

Does the noisy-channel coding theorem (Shannon's theorem) apply to two-way communication with retransmission requests?

Does the noisy-channel coding theorem apply to automatic repeat request systems? Some people seem to imply that, when a system has 2-way communication, such systems can have far lower error rates at ...
0
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0answers
22 views

Olimex MOD-485-ISO and Arduino Mega2560

I am trying to use the MOD-485 ISO to communicate an Arduino Mega2560 with a PC as shown below: Both jumpers are on (z-b) and (y-a). For more info please see my post on the Olimex Arduino Forum: ...
0
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3answers
58 views

error correction code

Is there any technique which can detect and correct all error bits. To my knowledge 100% error correction is not possible but is there any technique that possibly exists? And can hamming code correct ...
-2
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0answers
24 views

Any chance I can continue both telecommunications and control? [closed]

I'm interested in both Control Engineering and Telecommunications Engineering (specially Communication systems), and I have to choose one of them as my main field (It would be my sixth semester in ...
0
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2answers
65 views

Power-line communication to household!

Most households in this planet have multiple 'wires' - one for plain electrical power, one for telephone, one for internet and one for cable TV (there may be more). I had heard of PLC ...
-1
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2answers
49 views

Does a regular signal booster with antenna work for cell phone?

I am not that much familiar with communication and antennas. I want to build a gsm repeater (gsm signal booster), but I am not sure if it works if I do it like the way we do for a radio. What I am ...
1
vote
1answer
74 views

Read the instrument data from printer port directly with computer

I could not find the step by step guide of some kind to accomplish what I am planning to do. I have two devices that I want to connect to PC (windows). Right now, both devices write their output ...
4
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2answers
76 views

why smartphones don't cause noise on the around speakers

Before the smartphones (or maybe before the some new tech) when a cell phone rings, the speakers around it made noises. Hovewer, nowadays they do not. Why? What changed?
1
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1answer
47 views

Find autocorrelation function of a signal

Find auto-correlation function of a signal $$g(t)=e^{-2t}\cdot u(t)$$ where \$u(t)\$ is the unit step function. I don't know how to start to solve this problem. My book list this equation only: ...
0
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1answer
65 views

How to programm a standalone MSP430g2553 via a com port?

The MSP430 is a dirt cheap MCU and i thought that if i could make a barebone launchpad out of that which can be programed directly via the PC COM port or a virtual one. So is it possible to program it ...
0
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2answers
51 views

Controlling a simple RC vehicle at long dinstace from a PC

I would like to control a simple, ground-based vehicle wirelessly, at ranges up to 5-6 km. The communication would be bi-directional (to get a feedback of "command received") but would only require ...
0
votes
1answer
55 views

Why is there a guard band in ADSL

I recently learned about ADSL and its modulation method DMT. I know the frequency spectrum is split up into a number of orthoganally spaced bins: Voice(PSTN) - Guard Band - Upstream - Downstream ...
0
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0answers
45 views

Why is asynchronous NAND negatively affected by compressed data in SSD benchmarks

Over the last year, the Kingston V300 SSD received lots of flack for having good benchmark scores but poor real world performance. PC building enthusiasts point the gun to Kingston's benchmark tool ...
1
vote
1answer
61 views

How to Calculate maximum distance between transmitter and receiver in wireless communication

how to calculate maximum distance between transmitter and receiver in free space radio communication by having transmitted power, antenna gain and noise-to-signal ratio ?
0
votes
1answer
70 views

Why can current phones act as Wi-Fi routers, but not as mobile broadband (3G, 4G etc.) routers? [closed]

Many of today's smartphones enable users to share their own internet connection with others via Wi-Fi through tethering. However, from what I understand, current Wi-Fi has much shorter range and ...
0
votes
2answers
60 views

Wired communication from 1 atmel to many nodes

Right now i am looking for a better way to communicate to our wired nodes in a project that we are working on. Currently there is 1 main node that all other nodes talk to that in turn handles all ...
0
votes
1answer
73 views

How to interface with credit card terminals?

I am considering doing a project that involves a machine that can accept credit card payment automatically from customers. Think of it as a vending machine, that accept credit card. I want to ...
1
vote
2answers
79 views

Is it allowed to stop and restore I2C transmission?

Is it allowed to stop and restore I2C transmission? I would like to stop it in different periods of transmission and then after for example 500ms restore it to the state when it was stopped. I'm ...
1
vote
0answers
25 views

Minimum Shift Keying (In-phase, Quadrature Components derivation)

In the derivation of the minimum shift keying in-phase and quadrature components in Simon-Haykin Communication Systems 4th ed (p.387-390) we start off with the definition of the signal to be \$\ s(t) ...
1
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1answer
48 views

Why does timing change in dataframe using Manchester encoding

I have successfully received a couple data frames from an RF transmitter. I compared couple consecutive frames and the timing deviation between them is marginal, so I am convinced it is reasonably ...
1
vote
1answer
141 views

Simple Two wire SPI communication between two PIC24s

I am trying to achieve a simple SPI communication of 16-bit data from a PIC24FJ64GA002 to another of the same microcontroller. By following the data sheet to the word, I wrote the transmitter and ...
-1
votes
1answer
70 views

Cell phone detector circuit design [closed]

This circuit I found on the internet detects mobile frequencies that transmit to the base station in the range of (0.9 to 3 GHZ). I want to understand how can I get or calculate the values of some ...
2
votes
3answers
291 views

How to read a push-pull output

I recently came across a sensor that had a "push-pull" output. I can't find anywhere how to read such an output: Is it some particular kind of analog output? I would want to read it with the ...
0
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1answer
33 views

Comparison of data transfer between different bandwidths

Which of the following can transfer more data [bps] 10Hz bandwidth over 2s 20Hz bandwidth over 1s It looks like its the same bps but I'm not sure.
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0answers
94 views

Passing sensor data from Arduino Uno R3 to android with USB Serial

I would like to know how would it look like to receive data on Android from DHT11 sensor which is connected to Arduino Uno R3 via USB Serial? I was trying some code examples for Arduino but i got a ...
1
vote
1answer
93 views

PIC to PIC serial communication

I need to send all port info from one pic to another using serial port.. currently using 9600bps baud rate. on pic18f4550 running at 20mhz clock. i have used this code to send and receive data of a ...
0
votes
1answer
44 views

GSM ZTE MG2639 module freezes after checking SIM

I'm communicating with my ZTE MG2639 module through UART. Few seconds after powering it and getting +CPIN and +STKPCI it just turns off (goes to stand by mode) It only happens with SIM card, and ...
1
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2answers
72 views

Differential Manchester Encoding

I am trying to understand Differential Manchester Encoding. The way I understand it is that the representation depends on the previous bit. If the previous bit was 0 there is a transition, but if it ...
0
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0answers
45 views

Amplitude modulation circuit explanation

I am currently doing an amplitude modulation experiment and I am using the following circuit: I need to know the effect of the various components regards to amplitude modulation. And also what is ...
0
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0answers
16 views

Will grid tie inverter and powerline communications affect each other

Since grid tie inverters "conform" their power to match the frequencies of a home, would powerline computer communications such as this router be affected by or affect a grid tie inverter?
1
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2answers
60 views

What is the exact difference between SGMII and 1000Base-X?

I was wondering what the exact difference between SGMII and 1000Base-X is, because both seem very similar. Is the "big" difference only the physical medium they are supposed to be transmitted on? Both ...
0
votes
2answers
93 views

Long Range Arduino Water Monitoring

I'm looking for advice on how I should setup a long range irrigation monitoring system using multiple Arduino boards. I would like advice/options available on what hardware I require to achieve my ...
1
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3answers
154 views

How does the automatic garage door opener know which button I've pushed on the wall control panel?

The wired wall control panel in my garage has only 2 wires connected to it. Yet somehow it acts different when I push the big "door" button than when I push the "light" button or the "lock" button. ...
3
votes
3answers
279 views

High Altitude Balloon Communication

Our team is planning to make a HAB (High Altitude Ballon) project for our university. We are planning to use XBee pro 868 RF modules (we are in Europe so we can not use 900 MHz band). We have to ...
-4
votes
1answer
69 views

What is data rate? [closed]

What is the definition of data rate? What is the unit of it? Is it related to successful bits?
1
vote
1answer
69 views

40% Channel Utilization on 1Mb Satellite

Using the Slide Window technique, consider a satellite channel with: 500 byte frames sends 270 ms delay on send and receive 1 Mbps rate communication protocol is Sliding-windows Ignore the length ...
1
vote
2answers
64 views

How does a teleprinter work?

How in detail does a teleprinter system work? I am aware that many teleprinter used the Baudot code to relate alpha-numeric symbols to a sequence of 5 bits. What is the mechanical means by which a ...
0
votes
1answer
52 views

How can the Nyquist theorem for the maximum bit-rate of a noiseless channel be derived?

I've been given the formula: $$ I = 2* H * log_2(L)$$ where: \$ I \$ = Maximum data rate in bits per second for a noiseless channel \$H\$ = Bandwidth that the channel will carry (that is, the range ...
0
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0answers
18 views

A closed form for calculating shaping gain

As we know, in a communication system, we can divide the overall gain into coding gain and shaping gain, but I have not seen any closed form formula for calculating shaping gain, but the definition ...
1
vote
2answers
67 views

Communication between 3 Atmega controllers

I am studying a bio chemistry analyzer, in which there are Main controller, printer board controller and detector board. To establish communication between these three, RxD pin of one controller is ...
2
votes
1answer
72 views

AVR USART wait for AVR's reponse to continue text stream

AVR USART wait for AVR's reponse to continue protocol I am doing a senior project, and I need to send a large text file line by line to an AVR (atmega32) which will control a piano using ~36 ...
1
vote
2answers
54 views

Making a program that sends data to USB port [closed]

I want to create a program that is able to communicate to the USB port on my laptop. From this program I want to send data to the USB port constantly. Basically something like a hyperterminal, but ...
0
votes
0answers
106 views

Transferring data from FPGA to PC (new to FPGAs)

FPGA beginner here. I have a Basys2 FPGA board(i code in verilog) and i wish to make it communicate with my PC. Currently it receives data from a slave device and stores it in an 64 bit register. ...
2
votes
0answers
53 views

Home made passive tablet pen

I have an old wacom tablet at home, its really big and I'd like to use it but I've lost the pen for it. It uses pens with passive LC circuitry. The board creats an EM-field (I can see it on my ...
0
votes
1answer
77 views

Low-Voltage DC Power Line Communication IC

I am wondering whether someone can recommend/suggest an integrated solution for Power Line Communication over low-voltage (4.5V-18V DC), short distance (<20m) wires. Discrete solutions involve a ...
1
vote
1answer
102 views

EM MWD Gap Sub Telemetry Theory Explanation in Drilling Applications

I have been doing an extensive amount of reading on EM (Electromagnetic) Telemetry in MWD (Measurement While Drilling) applications. From my reading, there are a few considerable gaps in my ...
3
votes
2answers
107 views

TTL Long Distance Transmission Alternatives

I am working on a system that gets data from a sensor via a TTL connection. Currently, the data that is gathered from the sensor is sent to another part of the system via a set of modems. The ...
0
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0answers
19 views

Variance of background thermal noise wireless communications?

I am new to this forum and hope I can get some help. I have been reading a paper on wireless communications, in this paper a base station with power P=25 is serving a certain user. The user is ...
0
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0answers
33 views

2 wire (Ground/Power/Data) for low power systems

I'm looking for suggestions on a low power system that provides power, data and ground over 2 wires. It also needs to support multi-drop and star network topologies. I've found HART, which is close, ...