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

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25 views

Question on Superherodyne Fm receiver to find the range of local oscillator and the image station …?

Consider a superheterodyne receiver designed to receive the frequency band of 1 to 30 MHz with IF frequency 8 MHz. a) What is the range of frequencies generated by the local oscillator for this ...
0
votes
1answer
54 views

how to communicate between 3 devices

i want to communicate between uno, mega and netduino, which protocol should i use i want the uno and mega to send information to the netduino which mean that i don't need duplex connection which mean ...
0
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1answer
36 views

Serial port communication [on hold]

I have transmitted the data from a PC to other devices using a serial port cable. In that case I was using windows 7 32 bit os. But when I tried it with 64 bit os I am not able to transmit it. Is ...
1
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1answer
31 views

Limiting wired low frequency signal transmission

I'm now considering TDA5051A to transmit information over the 230VAC power network. To avaid any interference between neightbours I will need to stop transmision beyond the appartment electrical ...
0
votes
3answers
50 views

Spreading of a pulse in time domain

I have a small doubt. Suppose I transmit just 2 square pulse with frequency of 100 MHz over a wireless channel, will it spread in the time domain when received by a wireless receiver. In other words, ...
0
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0answers
11 views

How do I use the XStream RF module for serial data communication with a BeagleBone Black?

I am currently part of a car team and we needed a minimum 2.5 mile range wireless system which would communicate the sensor values(Battery voltage, current etc.) to the ground station via a radio. ...
1
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1answer
254 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
1
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3answers
54 views

Convert MP3 recording of data casette to serial data

I have a retro EMCO F1P CNC machine with a matching M1 controller that comes with mini data cassettes containing the "Machine State Data" which must be fed into registers of the controller before ...
0
votes
1answer
81 views

Difference between SPI and CSI?

I want to know the difference between Serial Peripheral Interface(SPI ) and the Clocked Serial Interface( CSI).I know that both the protocols are serial in nature and differ in number of signal ...
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2answers
55 views

what are AT commands and what is the related hardware? [closed]

Can anyone be specific about why exactly are AT commands used in brief. On what hardware devices can I use AT commands?
9
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5answers
120 views

Visible light communication receiver

I am a student and I have to design a visible light communications project. The requirements are 20 cm distance between the receiver and transmitter, 20 kbps/s data rate and it must work in an already ...
2
votes
1answer
78 views

Why 802.11g has a maximum throughput of 54mbps?

Can anyone explain why the maximum throughput of the IEEE 802.11g standard has a maximum throughput of 54mbps I can not find that. I would like to know how do you get this 54 taking into account the ...
1
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0answers
60 views

Basic “filtering” in digital communications [migrated]

I am completely stuck on solving some problems for my digital communications class. Junior level undergrad class, so fairly basic. I have been searching around all day for related articles etc but ...
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0answers
56 views

how is wired communication of arduinos over 2km is possible

i want to transfer the data sensened by the sensor which is of few KB over a distance od 2 km so how is that possible
1
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1answer
49 views

is it possible to ignore the audio jack? [closed]

i would like to have a headphone jack with an on/off button, so that the jack will still be connected to the device (computer, phone etc') but the device would ignore it. does such a thing exist? and ...
0
votes
0answers
22 views

Connect the output of an Arduino to the input from another Arduino [migrated]

I'm making a project and i'm trying to send bits from an Arduino to another Arduino with the digital pins. So my setup are 2 Arduino's connected with a jumper. I connected the grounds and they have ...
0
votes
1answer
56 views

Using of RF transcieivers to communicate over 230VAC powerline

Initially I need to communicate between several devices placed within one appartment (or a building). All those devices will be connected to 230 VAC power line. I'd like to skip any wireless ...
1
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0answers
16 views

Compression and communication power consumption trade-offs

Let's say I'd like to save battery power consumption when sending data to remote devices connected wirelessly, i.e., sensor networks. One of the ideas may be compressing the data to reduce the number ...
2
votes
2answers
142 views

Can we send multiple signals in same core at the same time in the fiber optics? If yes, how?

I am curious to know how exactly does the fiber optics works. I understand the basic concepts of the fiber optics communications but am curious to know if there is a way to send multiple signals in ...
0
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0answers
40 views

Transmitting data over Long range ,using a Low Power Circuit

I Have Been Designing a BOT That Would Travel Along the Pipeline And Detect Leakage Using Ultrasound Efficiently,And Locate The Position of Leakage Using A GPS MODULE using the Arduino,I have make it ...
0
votes
1answer
31 views

How does the ft2232h read/write work in cpu-style FIFO interface mode?

I'm thinking of making the following circuitry: PC <-> Ft2232h <-> MCU (I'm using the MCU just for an initial test to see if I can get the ft2232 working. An FPGA will be used later) Have I ...
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0answers
114 views

How to calculate the SQNR of the PCM system in dB?

Assume that the input signal S(t) is sinusoidal with amplitude A and quantized to R number of binary bits, how can I calculate the SQNR of the PCM system in dB? I know that the output ...
1
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1answer
64 views

Industrial standard communication between multiple micro controllers on same pcb

I'm just wondering what would be considered industry practice of communicating between multiple micro controllers on the same pcb for instance when the digital i/o's or analog ins have been used.
-1
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1answer
31 views

Analog modulation trainer

i am making communication trainer as my FYP i am confused on analog communication module .. I have 2 options first one to make different blocks of analog like mixers, filters , amplifiers ,phase ...
1
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1answer
41 views

Is this a 3.3V to 5V logic level converter?

I am trying to interface an optical mouse sensor (OM10B) with an Arduino Uno. The sensor is 3.3V and the Arduino runs at 5V, but also has the 3.3V source. I found this very detailed homepage , where ...
1
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1answer
87 views

GSM Modem will not register to network

after getting two modems (dev boards) Siemens TC35 and SIM900A I cannot get them to send sms. From the research it seems that somehow sim cards will not register to network. I bought three sim cards ...
0
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1answer
47 views

ADS1278 double values

I am recently using a ADS1278 as the ADC of my system. The configuration is Frame-sync, TDM, Fixed for the 8 channels. The mode is high speed (sampling at 64KSPS). The core clock and the serial clock ...
0
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0answers
74 views

Can I (re-)use USB data lines after charger detection?

I'm looking to add the Texas Instruments BQ24253 battery charger to my hardware design and to connect it a micro-usb receptacle. Does BC1.2 Compatible D+, D– Detection mean I can no longer use ...
0
votes
1answer
42 views

Using CP antenna for receiving and LP for transmitting

I've set up two antennas with Linear Polarization (LP) in both sides, in 2.4 GHz no more than 4 meters each other, but they are facing strongly obstruction object (like a big steel wall in they line ...
0
votes
3answers
97 views

Sending data from 4 transmitters to 1 receiver without a microcontroller

I am working on a project to wirelessly check whether any of four switches are pressed and I don't want to use a microcontroller on the transmitter side. I have worked with the cheap 434MHz HT12E/D ...
1
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0answers
45 views

Sub-1 GHz Narrow Band vs Wide Band

As per the TI document I came across which compares narrow band sub-1 usage vs wide band sub-1 usage mentions a concept called coding gain and its disadvantages. Because of my lack of understanding ...
0
votes
1answer
80 views

How to find out Packet Loss in a Broadcasting environment

Indeed packet loss is an important metric to use when comparing different communication protocols. To me it is understandable how one would computer Packet Loss in a unicast transmission. Simply the ...
0
votes
1answer
39 views

Bayas and total probability theorem?

The answer to this question is \$0.9^4 = 0.6561\$. But what if the transmission probability are not the same, such as \$0.95\$ for correctly receiving a \$0\$ and \$0.995\$ for correctly receiving a ...
4
votes
1answer
129 views

Capturing data at 500MHz

I have an ADC sampling at 500MHz (It is collecting data from an Ultrasound sensor). I need to be able to stream this data to my PC (for the time being - this will be done through a wireless unit). I ...
2
votes
1answer
57 views

Can Cellphones/ be used for Ad Hoc Communication?

Can Cell Phones be (legally) used Adhoc, (ie, Point-to-Point) Communication? For example, let's say I'm in a remote area of the woods, or a valley. Can I configure cell phones to be used as true ...
0
votes
1answer
33 views

Probability of receiving a fixed bit sequence in a binary symmetric channel

What is the probability of receiving 1111 irrespective of what was transmitted? \$0.1^4 + 0.9^4 = 0.6562 \$ I am not sure about my answer because I think in my ...
5
votes
1answer
123 views

How does a low power device make a direct uplink to iridium satellite?

I was always fascinated by this idea. You are literally able to communicate or open a web browser from anywhere in the world. I am OK with the low power device able to receive data from satellites, ...
0
votes
2answers
51 views

Why there is no high voltage repeater / voltage translator ic (like max232) for I2C

why I2C don't work don't work with long wire, for UART we have 10 volt translators like max232, for I2C why there is no high voltage repeater ic?
14
votes
3answers
3k views

How can over 24 GHz communication be possible?

I read the article Google wants the US' wireless spectrum for balloon-based Internet. It says to use over 24 GHz frequency spectrum for communication. Is it ever possible to generate that high ...
0
votes
3answers
64 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
32 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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3answers
84 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 ...
0
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2answers
69 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 ...
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votes
2answers
76 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
135 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
votes
2answers
84 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
vote
1answer
80 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
votes
2answers
178 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
votes
2answers
54 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
58 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 ...