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

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1answer
45 views

is it possible to ignore the audio jack? [on hold]

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 ...
-2
votes
0answers
16 views

Communication with SIM900 module using AtMega16 [on hold]

I want to communicate with a SIM900 GSM module using AtMega16. I'm very confused about using UART or USART communication. Can anyone please shed some light on the difference between UART and USART, ...
0
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0answers
18 views

Help in finding TX/RX for surveillance UAV FPV in high temperatures and long ranges [on hold]

I'm building a customized ground control station for a surveillance drone. I have four proposed TX/RX frequencies, and the main ones that I need help in is for the pilot and the payload operator FPV. ...
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
37 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
vote
0answers
15 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
130 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
10 views

Arduino/C++ byte manipulation [migrated]

Consider this scenario, I have a single byte of data; I have to use the 8 bits it is composed of to generate 4 extra bits from it. Now, my problem is that I have to store this data somewhere while I ...
0
votes
0answers
38 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
25 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 ...
1
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0answers
54 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
61 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
votes
1answer
28 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
vote
1answer
38 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
vote
1answer
63 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
votes
1answer
40 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
68 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
36 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
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3answers
92 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
52 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
37 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
124 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
51 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
120 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
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2answers
46 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
58 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
votes
1answer
31 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
79 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
68 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
125 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
83 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
67 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
153 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
53 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
56 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
votes
0answers
53 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
124 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
75 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
71 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
91 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
83 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
33 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) ...
4
votes
2answers
80 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
207 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 ...
2
votes
3answers
385 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
votes
1answer
37 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.