Questions tagged [communication]

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

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55 views

How the diode in this circuit achieves AM modulation

For the last week, I've been looking for a simple circuit to transmit VHF analogue TV video signals, so that I can transmit my Raspberry Pi output to a TV set. Since I don't have enough experience in ...
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1answer
28 views

Stream Audio and WebCam Video through Radio Frequency

I and my friend would love to make a better communication system between us since his internet connection is not the best and neither is mine. We are 20 km away from each other. Our project is to ...
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1answer
77 views

What factors does the set-up time and Hold-time for an interface IC depend on?

I have working with EEPROM and QSPI Flash ICs. They have this electrical parameter called as Setup time and Hold time. I know we must not violate this in order for proper communication. But my ...
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42 views

IC power consumption under 50% vs 100% busload

Is the dynamic power consumption difference significant for a uC, if it has to raise its activity on the chosen bus protocol from, lets say 50% to 100%? I look in overall to the uC+CommController+...
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2answers
122 views

How do i measure Ethernet signals on an oscillocope

I have a device that works on 100 Mbps using a CAT5E cable. Any idea of how can I show the data communication (capturing the signal integrity eye pattern) of this device using an oscilloscope (4 GHz/ ...
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3answers
97 views

Number of errors that can be detected with a single-bit even parity code word system?

How many errors can a transmission system which uses code words with 7 data bits and a single parity bit (Checking for Even parity) detect at the receiving end. While I am aware of the fact that any ...
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3answers
86 views

Help wiring a Raspberry Pi and odd DB9 connection

I need to send a signal from a Raspberry Pi 4 to a PC running software that listens on a COM port and I'm having some trouble understanding the necessary wiring. Here is the documentation I have for ...
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0answers
38 views

Zero - IF receiver main limits

I was reading these slides about receivers architectures, and I have some questions about Zero - IF receivers: Precisely: Why is the spectrum around the carrier (i.e. the 2 "side bands") mirrored ...
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49 views

PROFIBUS Architecture for Ultrascale +: experts' opinion request

I'm working on the design of a custom carrier board based on a Xilinx Ultrazed-EG SOM. Specifically, the Carrier (embedding the SoM) should realize the PROFIBUS DP master node in the specific ...
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1answer
70 views

How can I solder a 2nd connection to a mini USB?

I have a device that utilizes a mini USB port to send and receive data. I am trying to figure out how I can hook a micro controller to that mini USB port so that it can also send and receive data. ...
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4answers
85 views

Why we need bandwidth with ASK?

Now I know that this question might sound silly, that is because apparently I am missing something here. Basically my question is, if ASK works as on/off keying meaning that provided we have an ...
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4answers
63 views

Clarifications about up and down converting mixers

Let's look at this definition of mixers (reference): A real mixer cannot be driven by arbitrary inputs. Instead one port, the "LO" port, is driven by a Local Oscillator with a fixed amplitude ...
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1answer
54 views

Simplex UART echo implementation on ATtiny

I'm currently trying to implement a simple UART echo application on the ATtiny85, with no additional pins other than RX/TX (no autoflow control). I'm using the Universal Serial Interface of the ...
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1answer
56 views

Does the expression of amplitude modulated suppressed carrier even exist in reality?

I read that a negative frequency implies "forward" travelling wave and a positive frequency implies "backward" travelling wave, so.. does a suppressed carrier amplitude modulated wave not exist due ...
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24 views

Concept of matched filter maximising SNR

The above question is a solved question from Digital Communication by Proakis . The question is about matched filter where I know matched filter is used to maximise the signal to noise ratio at the ...
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0answers
44 views

Problem with SPI communication to TDC-GP30 Ultrasonic Flow converter

I'm working in TDC-GP30 an Ultrasonic Flow converter chip. Which can be directly hooked up with ultrasonic transducers to get digital output. But the problem is according to the datasheet the chip can ...
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2answers
62 views

How does twisted pair turn rate affect interference rejection bandwidth?

I'm curious to know how the turn rate of a twisted pair affects the frequency of crosstalk interference rejection. It's clear that an untwisted pair has no inherent rejection. Alexander Graham Bell ...
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2answers
70 views

Please help me understand modbus communications

I'm just starting out with understanding how modbus works over a rs485 protocol. I've received a communication protocol document from a company that makes solar inverters. I want to send a command ...
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2answers
101 views

Driving Multiple LEDs with the Help of Shift Register

I am using this Shift Register. My circuit is the same as the Figure 14 in the datasheet. I am trying to understand how the data flows from the MCU Serin, Serout lines and how the LED are driven. ...
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2answers
70 views

Shift Registers for generating codes

can you explain me in simple words how does a linear feedback shift register work for generating a code? Consider for instance this scheme: If I have understood it correctly, each block is a D Flip ...
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1answer
69 views

Is shared ground necessary?

I ask this mainly for curiosity and am not trying to make shortcuts for real projects. I have a couple of devices (mcu development boards) that connect to each other using various communication ...
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2answers
92 views

What is RS-485 and MODBUS? [closed]

I understand the title seems too broad but it's a bit specific and I'm totally new to the communication stuff, so please bare with me. If the question is too broad, please provide some suitable links ...
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4answers
78 views

Rejection of particular frequency in a signal which contains many frequencies in its spectrum (fourier transform)

How does a filter know which frequency is to reject? Detail: A signal may contain a lot of frequencies. How could we surely say that the result of linear combination of the result of applying ...
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1answer
115 views

I2C Bus getting Locked UP on Single Master - Single Slave System

I was trying to develop a I2C driver function for reading data from a proximity sensor(Cypress CY8CMBR3102) and initially the function worked very well and successfully. But while continuously reading ...
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1answer
105 views

PCB Design - How much length can I2C lines differ by?

I am designing a PCB that uses I2C communication and was wondering how much length the SCL and SDA lines can differ by. EDIT: Clock frequency can be anything from 95kHz to 400kHz. Is there a ...
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33 views

Why does multipath impulse response contains a complex phase shift?

The multipath impulse response is defined as $$h(t) = \sum_{n=0}^{N-1} A_n e^{j\phi_n}\delta(t-\tau_n)$$ My qustion is, from intuitive point of view, why is there a complex phase change of the ...
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1answer
36 views

Proportional fair scheduling

I came across this section in the paper Providing quality of service over a shared wireless link, IEEE Communications Magazine: Consider a very simple system with two users. The service rate (in a ...
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3answers
79 views

What makes a communication architecture/protocol faster than others?

Why is thunderbolt considered faster than other? Apart from the inherent channel properties which affect the speed of data propagation, what else determines the speed of data transfer? Of course ...
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2answers
109 views

I2C Communication Open drain benefits vs Push pull

I am reading this TI I2C App Note for understanding the I2C operation and need to understand how Multi master I2C will operate. I was not able to understand this para in the app note, "Since no ...
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5answers
1k views

How to end sending data over I2C by Slave or Master?

Let us say a Slave or Master is sending multiple bytes to the receiver on I2C bus and the number of bytes is not defined before hand. So then how will the sender tell the receiver that it has no more ...
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1answer
74 views

Large delay between I2C messages on STM32F303 - trying to read as fast as possible

I've got a sensor that I'm reading via I2C. My end goal is to be able to maximize the rate at which I can take these readings. In order to read, I have to write an zero-byte I2C message to the slave ...
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1answer
25 views

Gaussian Channel: Capacity and Explanation

Let's consider a gaussian communication channel, which is represented through this scheme: Starting by this assumption it is possible to prove that the channel capacity is equal to The computation ...
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4answers
4k views

How to communicate faster than the system clock

I was reading about the new (ish) Thunderbolt 3 today, and was very impressed by the specced speed of 40Gbps. Then I looked at Intel's latest i9 processor speed... about 4.2GHz max. How can a system ...
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1answer
53 views

Understanding Common mode voltage

I am trying to understand common mode voltage a little bit fundamentally (only with electronic devices and no math). I watched this Youtube Video to understand common mode and differential mode ...
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1answer
48 views

Confusion regarding the term“locking” in PLL

I am trying to learn PLL from a website https://www.allaboutcircuits.com/technical-articles/what-exactly-is-a-phase-locked-loop-anyways/ ]1 I came across a sentence containin[g the term "lock" ...
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1answer
67 views

Meaning “Colay with mSATA”

In a datasheet of a embedded device (this one in my case) what does it mean that the PCIe bus is conneceted to a socket that says "Full-size Mini-PCIe (colay mSATA)"
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2answers
61 views

Can I2C protocol employ differential signalling for a longer distance?

As far as I understand some serial protocols use RS485/422 differential signalling to be immune to noise for long distances. We also know that differential signalling is about voltage levels and ...
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2answers
922 views

Is the SCK line in I2C unidirectional or bidirectional?

I've always considered SCK to be a unidirectional line since the master generates/transmits the clock signal and the slaves "see" the generated pulses. I have found many sources that agree with this ...
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0answers
77 views

Small inductor coil in VCC, why it helped?

I have two devices, which I do not know about their internal circuits, and they communicate with each other. The communication between them is made by four wires, VCC, GND and two communication wires....
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0answers
65 views

STM32F0 UART Receive and Transmit Simultaneously

I am struggling to establish uart communication between 2 stm32f0 properly. Either To Transmit data from one to another or Receiving are not a problem. I am sending data from first device and I can ...
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4answers
457 views

Is a ground connection needed in between master and slave for this RS485/422 scenario?

I will work on a small project where an SSI-output data (angle data) of a rotary-encoder will be read by a micro-controller board (such as an Arduino board) and the micro-controller will then send ...
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2answers
53 views

Calculate the data speed with clock rate

If the clock speed is 45.25MHz and I need 7 data cycles within that clock cycle, could someone show me the math to figure out the data speed frequency ?
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1answer
32 views

Confusion with serial communication standards when sending sync serial data to a PC thorugh its serial port

When I read about SSI communication I can see that a pair is used for clock and another pair is used for data transmission as follows: On the other hand if I read about RS422 all lines are data and ...
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1answer
52 views

Is NB-IoT roaming possible?

I found a comment on a blog post stating that NB-IoT doesn't support roaming: nbiot do not support roaming (you must have sim from the operator that have the infrastructure). nbiot also lacks ...
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1answer
35 views

Is there a way to direct the data to a particular port for this scenario?

There is a PC program which reads ASCII data from serial port in real time and processes it. The thing is I'm not able to change the code. The program reads the incoming data where one can only set ...
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0answers
28 views

Impleminting Quasi orthogonal space time block code with feedback on Matlab

I was trying to implement Quasi orthogonal space time block code with feedback that presented here. The code matrix is shown as below: where k1 and k2 are feedback from reciever. the value of k1 and ...
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2answers
236 views

Modbus RTU using SoftwareSerial

Im trying to control a temperature controller using Arduino MEGA over SoftwareSerial. Im using Modbus-Master-Slave-for-Arduino library and I tried to test using example code below. It gives only <...
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0answers
65 views

Safe and feasible way to multiplex CAN bus?

Is there a standard method or tool to connect more than one CAN bus to a CAN controller with single CAN interface? Each CAN bus would be directly connected to individual transceivers and then the Tx,...
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0answers
29 views

Replace half-duplex electrical connection with light?

The digital pins of two Arduinos are connected for half duplex communication: Now I want to connect the electrical connection with optical communication through a light pipe: Drafts for separate ...
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5answers
6k views

Can I use I2C over 2m cables?

In my current project, I need to communicate between a microcontroller and some sensors over I2C. One of them is a temperature sensor, it needs to be placed at approximatively 2 meters far from the ...

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