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Questions tagged [communication]

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

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1answer
70 views

CAN module (MCP2515) interface with Arduino [on hold]

I connected the Arduino with an electrical meter using MCP2515. But every time I am getting the same result: . The value in the meter is 12.0. Even I tried different data register which has value 0....
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0answers
14 views

What is the meaning of reciprocal communication range in the context of wireless communication?

Does it mean the carrier sense range is equals to the communication range, as this paper mentions the system has no hidden terminals due to reciprocal range ?
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1answer
29 views

What are the equations/values for Rayleigh Fading, path loss and log-normal shadowing?

I am to use the following equation as part of a model for a wireless communications network: I would like to know the specific parts of the eqautions: "k" - is this the Boltzmann constant? "v" - I ...
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1answer
21 views

Peak-to-Average Power Ratio in OFDMA Communication

I am looking for a formula to calculate the Average Power of a square wave used in APSK Modulation. In my textbook, the example above is given with no formula so I am a loss how the value for ...
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3answers
40 views

Multiple input to single output converter and vice versa

First question so please forgive any mistakes. I'm trying to design a system by which multiple LEDs are controlled by multiple switches, but without using as many wires as there are switch/LED pairs. ...
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1answer
38 views

SPI terminology confusion for project

I am working with the FET335xS-II OBC developed by Forlinx for a school project. On the data sheet, There is no indication of pins pertaining to MOSI and MISO but instead "data 0" and "data 1". I am a ...
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1answer
50 views

Does disconnecting the Tx+ and Tx- wires in the ethernet cable make it Unidirectional for Packet (TCP) sniffing

The DCSW-1005(10/100Base-T) Ethernet switch/TAP can be used as a network TAP (as well as Ethernet switch), in which a copy of outgoing and incoming packets associated with Port 1 (Target port) are ...
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0answers
99 views

Why is there no reponse from ModbusRTU slave using converter?

There are two devices: Eaton EM20/M (~like Northern Design Cube 400) Volison ADM-5850G Connected them like: Trying to get data from EM20/M which supports ...
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1answer
20 views

SIM800L cannot init

I'm working with SIM800L for remote-sensing communication via GPRS. The problem is, everytime the module is running initialization function (SIM800.begin(), different for every SIM800L library), it ...
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2answers
35 views

Finding required BW with Bessel table

The FM signal (see image 1) is applied to a 50 Ohms antenna, and I am seeking the required bandwith with the Bessel table (image 2). From the FM signal, I deduced that the information frequency is ...
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2answers
43 views

Noise power at receive antenna with finite transmit SNR?

I have seen a few examples of link budgets, and they all assume that the total noise at the Rx is just going to be -174 dBm + 10 log BW. However, this seems to me to assume that the transmit signal is ...
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0answers
48 views

How does GSM Module store incoming SMS in its “SM” or “ME” memory?

I am using AI Thinker A7 GSM/GPRS/GPS Module demo v7.1.(The Rx, TX, GND pins of this module are connected to tx, rx, gnd pins of the prolific Rs232-TTL converter and a virtual com port is open in ...
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0answers
33 views

How do I design a transceiver by combining a transmitter and a receiver?

My current project includes building a transceiver , which uses 144-147 MHz frequency, I/P power 10W and uses FM modulation. I was thinking to build an individual transmitter and receiver and ...
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0answers
27 views

Communication Theory - Determine efficiency of this protocol

My solution: I have no idea if what I did is correct. I'm getting a bit confused differentiating between 500 frames/minute and the 4.8Gb/s, they both seem like transmission rates to me. I'm assuming ...
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0answers
30 views

Communication Theory - Basic Transmission Errors

I have a question regarding some basic transmission error: My confusion is with the solution to combat errors (transmit each frame 3 times). I would have though that the probability of receiving a ...
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1answer
40 views

Write collision for multiple reads - PIC24 I2C

I am trying to poll a CAP188 sensor so I'm sending it read commands in a while loop, but the first read works and then on the second read when I send the slave address it detects a write collision. ...
0
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1answer
63 views

Is it possible to generate user-defined signal using an android phone?

Is it possible to generate an electronic wave signal using an android phone? (Theorically) For example by customizing the firmware can I produce some signals like \$ f(t)=2 \sin 3.2×10^9t+3\cos 5×10^...
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2answers
86 views

Maximum rate Shanon Hartley

i am reading computer networks and i am trying to solve an excercise. the excercise is What is the theoretically the maximum rate at which data can be transmitted to a 4000Hz bandwidth ...
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0answers
16 views

UART Current in PIC18F46K22 & 7404 Input Current

I am currently making a decision to invert the UART signal from my PIC18F46K22 and have 2 choices to either use 74LS04 and 74HC04 but there is a difference between the LS and HC that the LS can output ...
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2answers
91 views

Why maximum power transfer condition is suitable for communication system but not for transmission of electricity?

A fundamental concept that i have learned from basic electrical circuit study is to receive maximum power by a load of resistance RL from a source the necessary ...
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2answers
72 views

Is an external crystal overkill is this case?

I am designing some boards that are powered and communicate through Cat 5 cables using a bit banged form of protocol inspired by quad spi. Using the bus network topology in a half duplex manner, I ...
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2answers
56 views

Is wireless technology only possible due to inductance?

I asked a friend how capacitative coupling works in glass-mount antennas. He said it's like when installing a sound system; where you want to keep the power & audio cables separated, to avoid ...
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1answer
62 views

Bandwidth-Noise-SNR relationship

Let’s say we have the noise figure F of a system of devices. We also have the bandwidth improvement coefficient ( as defined by my teacher ) $$BI=10log(\frac{B_{in}}{B_{out}})$$ where B1 is the ...
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1answer
30 views

What are cost-effective and ways of providing global communication between two devices besides internet and SMS?

I am currently in the process of building a system which allows vehicles to send information back and forth with an Arduino. The main problem I am facing right now, is that the current implementation ...
0
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1answer
68 views

How does Wi-Fi deal with multiple frames received at once?

Right now I'm trying to establish a network of 30+ transceivers with NRF24L01 modules - one of them acting as central. However there are big problems, whenever two or more nodes try to send data to ...
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0answers
29 views

Is there a standard communication format for a document scanning head?

If I take a document scanner and the bar scanning head from it, how would I g about communicating with it and would something with the power of an Arduino have the power to interface with it? I have ...
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0answers
180 views

Honeywell I2C RH Sensor SDA line experiencing fluctuation between Vdd and Vdd/2

I had a problem when implementing I2C communication between NXP Kinetis K50 micro-controller and Honeywell Humidlcon I2C RH sensor. The RH sensor doesn't acknowledge when receiving the default address ...
0
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1answer
44 views

STM32CubeMX/STM32L0 UART Transmit unknown symbols

I am trying to connect UART communication with STM32L053C8-Discovery. But the problem is on terminal I get unknown symbols. My Setup on CubeMX ...
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0answers
20 views

ENC28J60 rejects unicast packets - unicast filter is on, MAC is set, and addresses match

I'm programming an ENC28J60 driver at the moment, and have encountered something odd when attempting to receive packets. More specifically, unicast packets. According to the datasheet, when the ...
0
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1answer
34 views

Antenna polarization and antenna directivity are the same?

I'm working on an RFID project, and looking for information about the antennas that I have to use, I have the following doubt: Antenna polarization and antenna directiivity are the same? Thanks!
0
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1answer
63 views

Does this wiring pattern for a DB9 cable exist as a standard cable?

I have a scientific instrument that uses a DB9 cable to connect to the standard RS232 port on a computer for communication. I've deconstructed one of the cables as I needed to make another one but I ...
1
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1answer
87 views

Current modulator for laser driver and analog audio signal modulation

I would like to build a proper laser driver and use an audio output to modulate the laser output. At the moment, I connected the audio output instead of the battery in a laser pointer. It works, but ...
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2answers
106 views

How does this fire alarm system transmit data on two-wire?

In the fire detection industry, analogue addressable systems use control panels and detectors (and devices such as interfaces) which communicate with each other by means of a protocol. What protocol ...
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2answers
371 views

Communicating between 2 different microcontrollers

My Arduino runs at 16MHz clock speed; another microcontroller runs at clock speed of 13MHz. If I send digital output directly from an output pin of the former to input pin of the latter, there will be ...
0
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1answer
48 views

Arduino RS485 Communication

Working on a RS485 IC circuit. It is a point to point communication between two devices connected to each other via MAX485 IC and CAT6 Cable. At 1 or 2 m length of cable, the data transfer seems ...
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2answers
52 views

What is image and video signal ?

Signal is something that carries information. Usually, something is a pattern of variations of physical quantity that can be manipulated, stored, or transmitted by a physical processes. I am wondering ...
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1answer
31 views

How can Erlang C values be greater than one?

Here is an Erlang C plot I did myself. The x-axis represents the total traffic while the y-axis represents the probability. Each line represents a different total number of channels. As you can see, ...
3
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1answer
957 views

Why do we need bit scrambling when using 8b/10b?

I want to ask the opposite of this question. Here are the purpose of the bit scramblers: Encrypt, but LFSR (and other used) bit-scramblers are breakable. Clock recovery, but it is done by the 8b/ ...
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1answer
47 views

Why are Erlang B and Erlang C formulas different?

Erlang B determines the probability that a call is blocked and is defined as: $$Pr[blocking]= {{A^C \over C!} \over {\sum_{k = 0}^{C} {A^k \over k!}}}$$ while Erlang C determines the probability ...
1
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1answer
29 views

utilize a single channel to transmit data generated from 16 users (using mux)

I have found this question in a book and find it confusing. The question is, For a communication system, it is required to utilize a single channel to transmit the data generated from 16 users. ...
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1answer
16 views

dsb_sc of sin wave

Can we take the dsb_sc(Double side band suppressed carrier)of a sinusoidal signal I know that it exists for cosine but for sine I can't find anything on the internet
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1answer
219 views

Analog beamforming vs digital beamforming

I am reading some research articles on wireless communication where they talk about beamforming techniques and their differences in Multiple antenna Tx-Rx systems (MIMO). It says analog beamforming ...
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4answers
977 views

Is this communication I²C?

I need to decode communication between two devices, but I have no information about these devices. All I know is that four wires are needed (GND, VCC and two wires of communication). I suspect that it ...
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0answers
40 views

Power of random signal in AM

I'm trying to wrap my head around this problem : I must admit I'm pretty much blocked from the start, at a). I don't understand how I could derive the power of \$s_{AM}\$ given the frequency of the ...
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0answers
22 views

Can interference cancellation be applied to half-duplex devices?

I am aware that interference cancellation such as successive interference cancellation is applied in the context of full-duplex devices. However, I am not aware if it can be applied for half duplex ...
2
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1answer
92 views

Communication between a Computer and Microcomputers

I am currently working on a project that require me to communicate between several Raspberry Pi's and a computer. I'll display data that sent by Raspberry Pi on that computer. Since I am using ...
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2answers
63 views

PLC as gateway with TCP/IP communication stack?

I'm having issues designing an architecture for communication in a vehicle. Currently a PC is connected through a switch to a series of ECUS, each one with a TCP2CAN converter. The PC has to be ...
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3answers
154 views

Methods for confirming on both sides that a signal was received in one direction

Say there are two devices (A & B) that talk to each other (full duplex). For the sake of this example, let's say the medium is RF (wireless). If device A sends a message to device B, what ...
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1answer
52 views

Which material is considered non linear communication channel?

Communication channels as far I have seen(Air and conductors) are modeled as Linear systems. Was wondering if there are mediums/materials that make the channel nonlinear? For example, if channel is ...
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1answer
93 views

PC to Rasberry Pi Serial Communication

Im trying to communicate to my pc using my raspberry pi using a software called Docklight. I'm using a serial cable (that i ripped apart) and my breadboard as shown below. Now, you can also see I ...