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

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-2
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0answers
30 views

What are com port and why does a pc need them? [migrated]

as in the question, i wanted to know the purpose of the com port since the computer have physical usb ports.I searched along the web but without any convincing answer. Thank you for your attention.
1
vote
1answer
35 views

what is the function of pre-emphasizer and dee-emphasizer in Stereophonic FM Receiver?

what is the purpose of theses two block ? I know that pre-emphasizer will boost the high frequencies before transmission and dee-emphasizer will reducing them by a corresponding amount in the ...
1
vote
1answer
53 views

Reliable way to transport data over 1-2 km distance

I am looking for some way to transport data (around 3000Kbps) omnidirectional. Transmitter should not weight more than 300 grams but receiver can be much heavier. The range I am trying to achieve is ...
-1
votes
0answers
20 views

Chipsets for data transfer over wires similar to EoP [closed]

Currently working on a project which requires two sensors on a low voltage network to be able to communicate. The sensors have their data read by an MCU from which point I want to be able to ...
-8
votes
0answers
35 views

what is the full name of Rm and Um interface?

Rm and Um are terms in communication system. Um is the interface between MS(mobile station) and base station system. Rm is the interface between MS and TE(terminal equipment). My question is: what ...
0
votes
2answers
42 views

How PCIe can tranmit data at 2.5 GTps?

Serial transceiver for PCIe is using Reference clock of 100MHz. Then how data transfer at the rate of 2.5 GTs is possible?
2
votes
1answer
52 views

Working of ring modulator

I am having trouble understanding how this ring modulator works i.e. how it multiplies the input & carrier to give us appropriate output? Any help or guide will bedeeply appreciated. Reference - ...
2
votes
1answer
62 views

Why does using Discrete Cosine Transform lead to data compression?

DCT is used in JPEG standard along with Huffman encoding to further compress the result. I understand that most of the data in spatial domain which is an image is "present in low frequencies". This is ...
0
votes
1answer
63 views

Sync pulse from PC

Can anyone suggest a way that I can send or detect short pulses between a microcontroller and an old laptop with limited I/O functionality. I need to do this every 5-10 sec. The laptop doesn't have ...
-2
votes
0answers
55 views

Communication between FPGA and PC via ethernet [duplicate]

I am trying to establish communication between a PC and an FPGA. I am using Atlys board of digilent company in which spartan-6 (xc6slx45csg324c) is connected to marevell 88E1111 phy chip. My frame ...
0
votes
0answers
15 views

duobinary coding : how to find if there an Error in a given sequence?

why we can't have even number of zero between opposite polarity ? is the same things applies for even number of ones between opposite polarity
1
vote
5answers
216 views

Low cost simple communication between two microcontrollers

What tradeoffs and connection options are there in low cost bidirectional communication between just two microcontrollers? In this case: Master/Slave relationship, bidirectional data flow Distance ...
0
votes
0answers
25 views

Data Transmission Including Lasers + Shift Registers

In a project we're doing we need to be able to transmit data through lasers. Data is just 4 bit binary numbers. So what we intend to do is have 4 Parallel in - Serial Out Shift Registers connected to ...
0
votes
2answers
61 views

AtTiny45 read lag?

I have set up 2 AtTiny45 setup like this (The left one is also connected to power): from which one (the left one) is generating a signal which is (when measured) looking like this: The second one ...
0
votes
3answers
56 views

How to send string in serial communication in AVR-C

So as the title states, instead of sending a byte of information at a time, I would like to be able to send a whole string. What I tried to do was that I tried to put the user input in an array and ...
1
vote
0answers
15 views

Arduino Bluetooth and Ultrasonic Distance Sensor (HC-SR04): printing values over BT gives error [migrated]

I'm trying to send the reading distance of an HC-SR04 sensor to an Android app, using Bluetooth. I succesfully managed to send values from many other sensor to the app, but when it comes to sending ...
0
votes
0answers
35 views

USB signal analysis

I have a device that I want to control it has window software that runs it, and a complex interface. I just need a pair of commands, also I know very little about usb device hacking, and signal ...
2
votes
1answer
47 views

Can two PCIe endpoints communicate with each other through PCIe switch?

Figure shows basic architecture of PCIe. From what I understood, Root complex block will convert data into PCIe format. That means PCIe endpoint to endpoint communication will happens through Root ...
0
votes
1answer
70 views

One wire (+GND) serial communication. How to have a correct coupling?

I'm a firmware developer more than a hardware designer. I've a doubt about an idea of mine. I want to obtain serial communication between eight ATtiny85 (slaves) and an ATmega168 (master - It might ...
0
votes
2answers
80 views

RS-485 Modbus device to MCU

I have a device (an energy meter) that sends data via RS-485 (Modbus protocol). And I want to collect it with MCU. The important thing is that I'm trying to design a board and I want it to be ...
2
votes
2answers
102 views

Serial data received in wrong bits

I have an RS422 interface set up between an Arduino and a custom-built device. The device is set to transmit a 16-bit header, followed by 66 bytes of data, at a baudrate of 460,800 and at 200Hz. This ...
0
votes
1answer
31 views

Atmega328P FTDI 5V USB Serial Communication

I am working a Atmega328P and FTDI 5V USB Cable to get a Serial Communication between the Micro-controller and the PC. I am using Tera Term for receiving out from Micro-controller. I am using an ...
0
votes
2answers
51 views

Bidirectional connection between a device and a webserver

I'm a software developer, I'm in no way familiar with electronic devices but I'm working with people who are familiar with them. Our problem is: We need to design a small device able to communicate ...
1
vote
1answer
76 views

Make two Arduinos communicate with electrical signals

So I need to make two Arduinos communicate. Though, I can't use any clock related system (so no Serial, no I2C...) and so my idea was basically to wire one from another so they could read electrical ...
0
votes
1answer
56 views

why it is hard to generate an impulse train ?

I have understood the concept of Ideal impulse sampling ,but i have struck upon the fact that practically generation of impulse train is not possible.
0
votes
0answers
20 views

communication between ATmega88 and LPC2138

I am trying to communicate between ATmega88 controller and LPC2138 by sending some text on UART lines from ATmega to LPC. UART lines are connected through 100 ohm resistor on hardware.  Currently I ...
-1
votes
1answer
61 views

Which is the better way to send a broadcast signal to a great number of smarthphones in the same place? [closed]

I wonder which could be the better way to send a broadcast signal to a great number of smartphones in the same place at the same time? I'm thinking about 10.000 to 50.000 smartphones in an area of ...
0
votes
1answer
63 views

High frequency SPI-like communication: is there any hardware allowing software tweaking?

I will need to communicate with a device using serial protocol mostly similar to SPI but with several changes: Data packet can has any bit length (e.g. 35 bits) Stop sequence formed by lack of ...
0
votes
1answer
38 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
63 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
votes
1answer
36 views

Serial port communication [closed]

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
vote
1answer
38 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
51 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
votes
0answers
22 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
vote
1answer
280 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
vote
3answers
67 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
107 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 ...
-2
votes
2answers
60 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
votes
5answers
170 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
90 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
vote
1answer
51 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
1answer
67 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
21 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
163 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
votes
0answers
45 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
45 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
vote
0answers
251 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
vote
1answer
66 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
35 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
52 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 ...