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Questions tagged [communication]

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

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1answer
726 views

What is problem with NRZ and how manchester line coding handles out of sync tx and rx clocks.?

I am reading about physical layer of the OSI model. Specifically the different ways in which digital bits can be represented as voltage levels, among the multiple types are: NRZ. Manchester encoding. ...
2
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3answers
251 views

IC voltages and low power design, What todo?

I’m working on a low energy device consisting of a couple of IC’s. What is confusing to me is the following, All ICs has a vcc supply range of 1.7 to 3.6V and most of the time the current reading is ...
-2
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1answer
160 views

VLC - OFDM with RPI3 [closed]

Edited, We want to transfer data in high speed's. we are using RPI3 for all the mathematics calculation. As we know the RPI dose not support ADC with high sample rate so it irrelevant for us. We ...
22
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6answers
2k views

What drives the advancement towards ever faster cellular network speeds? [closed]

I've always accepted that technology advances. Being born in the 90s, everything just becomes faster, smaller, cheaper and generally better if you wait a few years. This was most obvious with consumer ...
0
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0answers
57 views

Detecting ultrasonic by microphone and MCU

I design data-over-audio transmission to MCU. To do it i need ultrasonic detector with specific frequency, for example 50kHz. Seems, that electret microphone+low-pass filter+envelope detector will ...
0
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1answer
74 views

Suitable 12VDC Communication protocol for untwisted unshielded long-ish wire length?

What would be a reliable and simple tranceiver interface/protocol for board to board serial communication at about 100ft. [9600bps or lower is fine.] The two-lead communication wiring cannot be ...
0
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0answers
146 views

Low cost low speed fiber optic connection for embedded applications

I would like to use a fiber connection to send data between two nodes. The nodes would typically have a 8 or 32 bit micro controller. I need data rate of 2 Mbps or higher and distance is about 100 ...
-1
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3answers
181 views

How to transfer data via UART that is read form another module using SPO at a faster rate?

I'm using a VS1053,to do a PCM recording for 1 minute by using STM32l4 microcontroller. The data is read from the VS1053 at 16 MHz, the sampling rate is 8000 sps and each sample is 2 bytes, which ...
1
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1answer
471 views

How do I implement a communications interface to an Altera FPGA?

I have a DE1-SoC with some data coming in through an A-D Card. After digital processing I want to transmit data to a host PC for records. I'm trying to figure out the easiest way to go about this. I'...
2
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2answers
279 views

What is the RS-485 line wire series resistance limitations?

Just tried to simulate the communication line with the series resistance in it: As you can see even at 1 MBPS the signal at the "receiver" is fairly good. I'm pretty sure that this will be OK to ...
7
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1answer
898 views

Capacitors in MAX 232

Out of curiosity, can I replace the electrolytic capacitors in the circuit with non-polar ceramic capacitors? Will I get the shifting in level? MAX232 datasheet: LINK
0
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2answers
153 views

Decay rate of Filter and how it relates to transmission speed

I had a question with regards to the decay rate of filters and how it responds to transmission speed. Suppose we have implemented a simple BFSK system with two asynchronous receivers and we have a ...
2
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4answers
715 views

Implementation of Analog Matched Filter

I have been reading about communication theory and I was wondering if matched filters can be implemented with analog parts and what they would look like? If they can't be it seems like the matched ...
-3
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1answer
2k views

Multiple CAN bus devices broadcasting at the same time…possible conflict?

I've worked with CAN bus recently and started to wonder what would happen if multiple devices on a network suddenly happen to broadcast at the same time. I mean every device on the CAN-bus network ...
0
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3answers
538 views

Challenges of Power Line communication

I am looking into Power Line communication (PLC) as a means for smart metering. It looks totally possible to send the data from the meter to the source of the power supply or the transformer. Most of ...
1
vote
1answer
172 views

How to interpret this CAN bus data and find an equation?

I am trying to reverse engineer the data sent from an old CAN bus data logger. It sends a single ID which is selectable from a dip switch. The only bit of data I am struggling with is the RPM I plan ...
0
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1answer
534 views

Interfacing three UART devices to Microcontroller without loss of data

I have a microcontroller TM4C123GXL Launchpad, that has 8 serial UART ports. I am using Keil uVision5 with Tiva Ware for programming. I wanted to interface 3 UART devices with the microcontroller ...
0
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1answer
63 views

way to display the data from a multi function meter [closed]

I have a multi function meter and i want to collect the data and display it. My idea was to create a api for serial communication?? will the idea work or is there any other better way?? the meter uses ...
0
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1answer
89 views

Improving signal communication over distance

Knowing that Wi-Fi on 2.4 GHz has a good signal strength when there are 50 m between the access point and the unit that transmits the data. I want to transmit this data over a distance of 1.5 ...
0
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2answers
370 views

How does a CDMA Rake Receiver work?

If we dont know the channel coefficients but assume that we are sending a bunch of training symbols how does the receiver estimate the channel coefficients and how often should we estimate these ...
1
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2answers
1k views

high speed microcontroller - pc communication

I have a project where I have to sample a 4 bit bus every 100ns continuously for a data logging application (I need very low sampling jitter as well). I have a uC that can go up to 300MHz so speed isn'...
0
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1answer
204 views

Relate phase velocity and velocity factor (transmission medium)

I want to derive the velocity factor \$v_f\$ $$ v_f=\frac{1}{c\sqrt{L'C'}}\tag 1 $$ and this relationship with the phase velocity \$v_p\$ $$ v_f=\frac{v_p}{c}. \tag 2 $$ \$L'\$ is the inductance per ...
1
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2answers
82 views

Why we don't use pull down resistors for implementing I2C protocol ? And why resistance value varies in I2C depending on its speed?

I have read that we have to pull-up the SDA and SCK lines because the lines are open drain/open collector. But I don't understand why can't we use pull-down? Secondly why the value of resistance ...
0
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1answer
1k views

Differences max485 and max13487

In my application, I need to transmit data between two arduinos, one as a master and the other as a slave using 485. The arduinos are connected to these modules, which have a Max485: Schematic: With ...
1
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1answer
751 views

How to use Esp8266 to communicate between Arduino and Raspberry Pi? [closed]

I need to read 8 sensor values from Arduino and send it to Pi through Esp8266. Also after reading these data my pi will give back 6 other values (integers) which has to be received by Arduino again ...
0
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0answers
58 views

How to determine best wireless technology for my application

I'm trying to help a buddy research implementing some form of wireless communication between a dozen or so self-contained sensors to collect data placed outside around a small area (less than 20ft ...
0
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3answers
148 views

Why does the frequency response H(f) exhibit conjugate symmetry in case of a linear system with real impulse response?

The frequency response H(f) is a complex quantity. So, it can be expressed as: $$H(f)=|H(f)|exp[j \beta (f)]$$ Why in case of linear system, having a real valued impulse response h(t), does the ...
0
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1answer
51 views

Problem making an OOK current signal using pvcvs

I am trying to make an OOK current signal using pvcvs in cadence (I tried pcccs but i couldn't find out what the settings were and it didn't work), and in order to change the output to current i used ...
3
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4answers
4k views

How to transmit data over a long distance at a affordable price

Please do keep in mind that I have no background in electronic communication. The idea is to receive data from electronics at long distances. The distance I will be looking at to read data from ...
0
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1answer
72 views

When supply fan VFD starts up it causes communication problems for my energy management controller

We have an energy management system that controls the air handlers for a building. I have one unit that when the supply fan VFD starts up it cause the unit controller to start having communication ...
1
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1answer
63 views

What is the name of the syntax standard Keithley is using for remote control over serial?

Keithey (and other manufacturers) have a standard syntax for communicating over serial. Typically, commands look like (source): ...
2
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2answers
508 views

Propagation comparison between 868 MHz, 915 MHz and 2.4 GHz

I am looking for literature for Comparison between 868 MHz, 915 MHz and 2.4 GHz wireless communication system. For example under what condition I should use 868 MHz or when I should not use 868 MHz. ...
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1answer
54 views

How to send data from simple digital device to an Android application wirelessly?

I am trying to find a way to send measurements from a digital device (as the blood pressure device) to a mobile application that can analyse these data ..... How to send these measurements wireless ...
0
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1answer
263 views

Have mechanical butler's bell, would like to ring it with push button

I have been recommended to post here! Basically I have a butler bell which I'd like to ring from a few floors away with the use of a push button. I have arduinos, ethermegas, spark/particle core, but ...
0
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2answers
2k views

Which RJ45 pins should I use for power supply?

I'm somewhere in a process of creating mini automation system for hobby use. I've already put CAT 5e cables with RJ-45 connectors in walls. They are somewhere between 5 - 30 meters long. On one side ...
0
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3answers
820 views

Does narrow-band communication have any advantage over wide band communication? [closed]

Generally more information can be transmitted if the bandwidth of the signal is higher, but is there any advantage of keeping the bandwidth as low as possible?
0
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3answers
142 views

SPI/I2C chip, CS# pin pullip for I2C operations

I have a question regarding all sensors offering to work in either SPI or I2C mode. I am having some issues working with a MPU9250, but think it is a general question: When working in I2C, the MPU ...
2
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2answers
237 views

Two way communication between one master and multiple nodes

I have an architecture like this: Master - It contains an RF communication chip. All nodes rely on Master to receive and send data to a central unit. Node - It has some basic GPIO functionality. ...
1
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2answers
597 views

SIM7100 GSM Modem Unreliable Connection

I am trying to communicate with SIM7100 GSM modem but I could just rarely communicate with it across UART interface. I am observing the signal with an oscilloscope, I am giving 5V as High and 0V as ...
0
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1answer
76 views

Is there a network mapping tool for path-loss?

I am not sure if this is the proper forum. I am looking for a tool to evaluate the wireless network performance.For example, given a map where should I put a transmitter/or transmitter plus repeater ...
-3
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2answers
113 views

Controlling a circuit through a cat5 cable [closed]

What I am trying to do is to digitally send a signal through a cat5 cable. I wan't to send it digitally so people can't just come along and put a voltage on the wires to activate the circuit. I would ...
0
votes
2answers
433 views

How does data travel correctly over the wire?

I understand that through varying voltage, data can be transmitted as "high" and "low". What I don't wrap my head around is how the receiving end "dissect" the frame. I know there is a concept of ...
0
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3answers
162 views

Role of Coax Cable in bringing TV signal to our TV sets

We know that we receive the programs/shows of TV Channels from the producers of programs through CATV Service providers (almost obsolete, just wanted to get clarified on its working process) DTH ...
1
vote
1answer
198 views

How Gigabit Ethernet is achieved in fiber optics?

I understand how 1000BaseT works on Cat 5 cables: It uses clock rate at 125 MHz, 4D-PAM5 data encoding to transmit 2 bit per cycle and it uses the four pairs of the cable. The math is quite simple: ...
0
votes
1answer
827 views

Can I use a RN2483 to make a LoraWAN gateway?

I have a Microchip RN2483 LoRaWAN module and I would like to use it for making a LoraWAN Gateway. Is it possible? If it is, how can I do it? Or if it is not, why?
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6answers
3k views

Is it possible to transmit square waves EM signal through air?

Can we transmit any signal other than sinusoidal through air, if yes how and if no why ?
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2answers
963 views

Is the communication between the USB or PS/2 keyboard and the computer simplex, duplex or half-duplex (unidirectional or bidirectional)?

I am curious to know if the communication between the computer and keyboards is unidirectional or bidirectinal. Until a few days ago i thought the communication is unidirectional because only the ...
1
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2answers
314 views

Fundamental Minimum Noise Floor

I am interested in what are the fundamental limits for communication, theoretically of course, practically there many be many other limits. So I have tried to formulate a minimum noise floor for a ...
2
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2answers
220 views

S/N Formula with probability

Hello I am looking for the S/N formula that incorporates the probability of catching the signal, and setting an arbitrary treshold level above which we detect the signal. I can't figure out the ...
0
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2answers
489 views

VHDL: Receiving Data from Terminal to FPGA using TTL

(I posted same question in stackoverflow but didn't get right answer) I'm newbie in VHDL. So today, after UART Tx, I tried to read Datas that coming from Realterm terminal. I only wrote Rx codes to ...