Questions tagged [communication]

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

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What is an "all pole source"?

For background I am not an engineer, and reading about linear predictive coding, so this question may be very trivial. I am trying to understand what a textbook means by referring to something as an "...
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1answer
116 views

How do I emit an arbitrary 2.4GHz radio wave

I'm looking to create a microcontroller that would allow me to drive my ceiling lamp that is controlled by 2.4GHz remote. The end goal is to integrate it with home automation tools, and forget about ...
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0answers
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Using RF 433 MHz Transmitter in Basement

Electronics beginner here. I am making a robot controlled by Arduino that drives around in a basement car park with obstacles ---> like this. I need to transmit and receive radio signals from it ...
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1answer
43 views

How to understand the EIRP criteria in 47 CFR § 15.519 for UWB device?

I have difficulties to understand the EIRP critera in 47 CFR § 15.519 for UWB device.It says, (c)...a device...shall not exceed the following average limits when measured using a resolution bandwidth ...
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2answers
808 views

Controlling 3-pin pinhole camera from drone using Arduino

I've got a pinhole camera from an old drone that I dismantled a few years ago. It has a built in MicroSD reader, and 3 pins (red, black, and yellow). I'm wanting to repurpose the camera for use with ...
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1answer
214 views

How to convert from 2 data line full duplex to 1 data line half duplex?

I'm trying to design a circuit that can convert from a two wire full duplex (think SPI), with one transmit line and one receive line, to a one wire half duplex (think i2c), with bidirectional ...
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1answer
37 views

Time Auto-correlation function for a polar reutrn-to-zero waveform

I used matlab to calculate the time Auto-correlation function for a polar return-to-zero waveform to make sure that it has an ergodic property . I implemented the following formula as a function in ...
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1answer
252 views

STM32f103 NRF24L01 Communication Problem

I am trying to apply communication between two stm32f103c8t6 with NRF24L01 modules. And using uart with usb to ttl module to reach putty terminal. I am using KEIL and for generating code CUBEMX. Here ...
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2answers
126 views

Do we use any filter after photodiode?

In wireless communication, we use a matched filter to suppress out-of-signal-space noise. After this filtering we do sampling. Otherwise, the power of noise is infinite (practically very large). In ...
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1answer
45 views

Bluetooth power standard values

Let´s say I have a device with a bluetooth (BLE) 5.1 radio and I would like to know when, using a mobile phone, the power received from the device is good enough to stablish a reliable communication ...
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2answers
79 views

Usage of non-linear phase filters in RF receivers

I'm in the process of designing the analog front end for a RF receiver. The system will use BPSK modulation. I was wondering what effect non-linear phase filters (such as Chebyshev and Butterworth) ...
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1answer
97 views

Which ASCII character could interrupt communication?

Which ASCII character could interrupt or terminate or otherwise disturb communication on the reciever part. Not including acknowledgment, handshakes, identification or other programmed protocols. ...
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Problem with received GPS data

I am using an mtk3333 to read gps coords. I set nmea messages to only output gll data. The problem is that I am receiving the GLL packets but in this format: $GNGLL,,,,,004912.869,V,N*6D GLL packets ...
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Is it possible to transfer a bluetooth signal via something else?

Problem: For example, I have 2 devices communicating with each other via bluetooth. But there is a thick metal wall between these devices and this makes a difficulty between them. To fix it, can I ...
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3answers
106 views

Addressing individual distributed RGB LEDs

I want to have a set of RGB LEDs and to be able to define the color for each one individually. The LEDs will be in different locations but in the same room. Some solutions I'm considering with wired ...
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1answer
51 views

Is this chip SPI or Serial Interface

The datasheet for the chip TLC254 says that it uses a serial communication interface at the top of the datasheet, however, it has MOSI MISO SS CS and all the other SPI styled pins. Is it safe to ...
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1answer
75 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
36 views

Stream Audio and WebCam Video through Radio Frequency [closed]

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
304 views

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

I am 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 question ...
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47 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
670 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
626 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
189 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
77 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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1answer
97 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
134 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
138 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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2answers
282 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
65 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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0answers
125 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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2answers
489 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
91 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
189 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
98 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
312 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
169 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
89 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
509 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
400 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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1answer
44 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
154 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 more ...
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2answers
908 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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6answers
3k 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
336 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
106 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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5answers
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
188 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
50 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
315 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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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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