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Questions tagged [communication]

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

9
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4answers
2k views

What is a good communicaton device among teensy and arduino besides “XBees”

I have been using XBees to communicate my teensies so far. However, as you know, XBees are really expensive and when I want multiple devices to communicate with each other, I have to pay for several ...
1
vote
1answer
496 views

What is an INTERLOCK in J1939?

Hai I'm doing the project on J1939 Periodic Group Broadcast (PGB) protocol. I had an document where it mentions the word "INTERLOCK". I didnt get what is an INTERLOCK,First INTERLOCK,Second INTERLOCK ...
0
votes
1answer
415 views

Which device amplifies the optical signal in fiber optics?

My teacher ask me one question. How the optical signal or information was transfered in fiber optics communication? Then i explained it and use the word optical amplifier then teacher ask me what is ...
184
votes
8answers
31k views

Why does USB have 4 lines instead of 3?

USB specifies 4 pins: 1. VBUS +5V 2. D- Data- 3. D+ Data+ 4. GND Ground Why is this not 3? Could the Data and Power not share a common ...
3
votes
5answers
524 views

How does Near Field Communication protect from unwanted long-distance communication?

According to Wikipedia Near Field Communication is intended for short-distance communication - something like less than a meter. I wonder how could this limitation be enforced? Usually there're these ...
7
votes
3answers
782 views

Information content of amplitude modulation versus single-sideband transmission

An amplitude-modulated radio signal with carrier frequency C, which includes frequencies from 0 to F, will use output frequencies in the range C-F to C+F, or a total bandwidth of 2F. A modulation ...
12
votes
4answers
7k views

Implementing a CAN protocol layer in software

Background I'm developing a project which will require the modest microcontroller specs of: 8 12-bit, 10kHz ADCs 1kB of RAM 48-QFN or smaller footprint 20kbps daisy-chainable noise-resistant and ...
2
votes
1answer
379 views

Shifting Complex Baseband Signal with Pilot Tone

I am trying to shift a complex baseband signal. To do that, I am multiplying by \$e^{(j \times 2 \times \pi \times f_c \times t)}\$, where \$f_c\$ represents the shift amount. The baseband signal has ...
1
vote
2answers
1k views

Arduino(Nano) Low hertz communication (sound)

I'm thinking about having two arduino's(nano) communicating with eachother, but I'm not 100% sure how. So I was thinking about the ways that are possible: Radio Visible Light Sound Wi-Fi 3G And I ...
2
votes
5answers
540 views

GPS and Communication (802.11, BT, GSM/GPRS, etc.) ICs

I'm trying to do the preliminary proposals for a small, low power, low cost unit that is capable of reporting it's location to a central service. These devices will generally be in a small urban area,...
1
vote
4answers
2k views

Connecting LED to RO pin of RS485 Transceiver

I am using this RS485 transceiver in a circuit of mine and I'd like to place a tiny 0805 LED in series with a 1k resistor coming off of the RO (receiving) pin. I'm hoping this would result in ...
2
votes
5answers
2k views

Recommened chips for datacommunication over a low-voltage AC power line?

A client wants to send data (think 100 ... 10k baud) over a combined power / cable-TV coax cable, distances up to 1 km. The lower end of the spectrum (say up to a few MHz) is free, but the cable ...
15
votes
6answers
8k views

Wireless communication between more than two Microchip PIC microcontrollers

I would like to create wireless communication between Microchip PICs for my simple project. It's actually an one way communication but there is one server and more than one client (about 2-4, all ...
8
votes
3answers
900 views

Rather complicated sensor network

I was working on a project recently and it was the first one which was involved enough to make the sensor networking complicated. In the end, I think the communication was the bottleneck in terms of ...
4
votes
1answer
189 views

Modulation And Other Communication Terms

Could somebody explain the concept of modulating a signal? It's such a broad term I never really understood what it meant. Are phase shift, frequency modulation, and amplitude modulation all ...
1
vote
1answer
2k views

Arduino Serial communication troubles

I'm having problems getting my communication code to work. I enter the data 1, 0, 255, 50 and then it errors (shouldn't it wait until 8 bits have been sent?) it exits with my debug message of ...
3
votes
1answer
725 views

How do quarter wave antennas work?

I'm wondering how quarter wave antennas mimic half-wave antennas by using the ground plane. I haven't touched these subjects in a bit, but here are my thoughts: How does the mirrored return ...
7
votes
3answers
8k views

What does the “posted” mean in posted PCIE transaction?

What is the etymology of the word "posted" in "posted PCIE transaction"? I've worked with PCIE and I understand the difference between "posted" and "non-posted" PCIE transactions, but I don't ...
4
votes
3answers
2k views

MRF49XA Microchip Transceiver

Does anyone have any experience with the Microchip MRF49XA sub 1GHz transceiver? I have been trying to get one of these to talk to a pic16f886 over the last week or so over SPI and having no luck ...
4
votes
2answers
253 views

How can I add ECC to my packets?

I have been looking into using LDPC's in some of my projects and have had some questions come up. Currently my structure looks something like this: I am then able to have hardware wake when it sees ...
0
votes
2answers
608 views

Arduino Nano usage

I felt for getting a new hobby. I was thinking about controlling an Arduino through the Internet, and I'm not really sure yet how I'm supposed to do that. I was thinking about connecting it to a ...
0
votes
2answers
471 views

DB9 Serial communication

I am getting some strange character displays on hyper terminal, after establishing communication with my GSM modem using the appropriate baud rate. When I type "AT", it appears to get repeated or ...
4
votes
4answers
6k views

uart communication protocol

I'm working on a project where I have to communicate different lengths command from my PC to a microcontroller. (using usb to uart bridge) I already make a litle protocol (start byte, some data, ...
5
votes
1answer
1k views

connect my rc car controller with my computer

I am new to hardware. For my first project, I want to connect my RC car controller with my computer so I can control my RC car in my PC. What kind of things (hardware, cables, tools, as well as ...
3
votes
1answer
945 views

What are the practical implications of changing the rolloff factor of a root-raise cosine filter?

This is in regards to digital communications. I have a link I've set up using GNURadio that's sending BPSK modulated data through water via a LED. I can control the roll-off factor, $\beta$, of the ...
1
vote
2answers
634 views

Books on line codes?

Would you recommend any good book dealing with line codes (i.e. http://en.wikipedia.org/wiki/Line_code). I mean a book that goes a little bit deeper into properties of each encoding (e.g. spectrum). ...
1
vote
3answers
2k views

Choosing The Right IR Emitter for a Photodiode

I am working with the following IR photodiode http://www.mouser.com/catalog/specsheets/bpv22nf.pdf However, I am having some trouble figuring out what sort of IR emitter I can use with this. I am ...
3
votes
2answers
517 views

Recommend a Serial to USB cable/converter that works with modern OSes [closed]

I'm hacking on a board that has an RS232 interface (via a Max232 chip). My new computer doesn't have a serial port, which leaves me using USB. I actually have a Serial to USB cord already, but it ...
1
vote
3answers
2k views

Differential to single-ended conversion - transformer or instrumentation amp?

I need to convert the output of differential output DAC to single ended. It's a 2 Vpp signal with a 1 V common-mode output. The output is 100 ohms. Should I use a transformer or a instrumentation amp. ...
1
vote
1answer
471 views

How should I debug my mbed project?

I'm using an external power source to power an MBED module. I have the UART transfer and receive ports connected to a MAX232 level switcher in order to make the signals compatible with RS232. From ...
-1
votes
1answer
198 views

Using a laptop to communicate with an MBED module

I'm using an external power source to power an MBED module. I have the UART transfer and receive ports connected to a MAX232 level switcher in order to make the signals compatible with RS232. From ...
3
votes
3answers
2k views

Combine a low power XBee receiver with high power XBee transmitter in a model rocket

Have got some existing low power 2mW XBee series 2 with an Explorer that I've used successfully to communicate between a PC with the XBee Explorer and a remote Arduino based project. I'd now like to ...
1
vote
1answer
298 views

Sparkfun Bluetooth modem

Got a question about the Sparkfun radio modem WRL-08495. A pair of these replace an RS-232 cable, right? simple as that? What if my neighbor also has a pair of these? Is there mutual interference ...
3
votes
3answers
645 views

Doubts on Implementing a Simple Protocol for XBee Comms

A system that I'm developing will use XBee modules for a point to point connection between a micro-controller and a PC. Data will only be sent only in one direction -Micro to PC and at 10-20fps. The ...
7
votes
3answers
1k views

Connecting two phone handsets to talk

I am hacking some old phones into my arduino project. I am currently controlling all of the ringers, dials, and hooks through my board. At a certain point, I would like to connect the two handsets ...
3
votes
1answer
319 views

A low bandwidth mesh network for RC planes

I am looking for suggestions of a low bandwidth (<1 kbps) mesh network which can be implemented between RC model planes. It should be able to communicate over distances of 500m or more, preferably ...
10
votes
3answers
2k views

Selecting a network layer over CAN bus

I am planning on using CAN bus in an industrial automation application, however I'm having a hard time deciding how to implement the network layer. Does anyone here have any recommendations for a ...
8
votes
9answers
3k views

What are the ways I can make my circuit communicate with a computer?

I am a novice at electronics hacking. I would like to know how I can make a circuit communicate with a PC. Take for example, a simple circuit, with one LED and a switch. The switch on the circuit ...
6
votes
2answers
11k views

Power line communication principles

What are the principles of implementing Ethernet over power lines ? Is it reasonable/possible to create an Arduino shield which will provide both power & network ? (properly isolate the "dangerous ...
33
votes
13answers
16k views

Software to create timing diagrams

In my professional life, I sometimes need to create timing diagrams for protocols: UART, SPI, etc. However, I can't find any good programs available. What programs can be recommended for this and what ...
8
votes
5answers
860 views

What is the most popular embedded serial bus? [closed]

I'm designing an embedded device that I would like to make interoperable with third party peripherals through a serial bus. Should I choose SPI, I²C, or some other bus? The peripherals will be ...
9
votes
4answers
1k views

Communication between microcontroller and separately powered PCB

On one board I have a microcontroller with one power supply and on another I have a Flip Flop with a separate power supply. I want to connect a pin of the microcontroller to the reset pin of the flip ...
0
votes
2answers
446 views

Light Modulation and Detection

IR light is the mainstay frequency for optical communication systems. How could I experiment with UV frequencies doing the same thing? Ideally I want to set up a serial link just as is often done with ...
9
votes
4answers
3k views

How long between Arduino digital pin and IC?

My current project involves using 74HC595 shift registers to control an LED display, however the display could be up to 5 or so metres away from the Arduino board. The plan is to use some DB9/RS232 ...
4
votes
8answers
2k views

It's been more than 10 years (since I designed hardware with RS-232), and we're still using RS-232?

Are there any alternatives to this ancient yet still popular way of communication?
10
votes
4answers
472 views

Sharing and Notating Schematics?

So a friend and I were talking about schematics at work and how we can better communicate among us and our co-workers. I know Kortuk had asked a question previously that was similar, but that question ...
22
votes
11answers
25k views

Injecting a communication signal over DC power supply lines

I'd like to be able to daisy chain multiple devices using just the power supply wires and then inject a communications signal over the power lines to turn it into a half duplex network. Are there any ...
12
votes
8answers
23k views

Wireless communication over long distances

Would like to communicate between an Arduino and a PC but over a distance of 2500+ feet outside in the open, wirelessly. What would be the best way of doing this? The communcation devices I have ...