Questions tagged [communication]

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

124 questions with no upvoted or accepted answers
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209 views

Home made passive tablet pen

I have an old wacom tablet at home, its really big and I'd like to use it but I've lost the pen for it. It uses pens with passive LC circuitry. The board creats an EM-field (I can see it on my ...
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1answer
39 views

Filtering a demodulated signal

I've created a simulation on Matlab of amplitude modulation. After demodulating the signal I need to add a low-pass filter to remove the high frequency components. I'm confused as to why this is? I ...
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42 views

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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2answers
73 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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0answers
33 views

Implications of using a 2C-#18 twisted shield pair nec type cmr cable for RS-485

The cable will be passing modbus and another equal cable will be used for loadshare. The total cable distance will be about 100ft. Its catalog number E2032S. I notice other threads related to CAT5, ...
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2answers
385 views

Noise resilient, hot-pluggable communication bus over long cables?

I'm working on a setup, where we need communication between a master device and several slave microcontrollers distributed out in different boxes connected by "long" cat5e cables (3-10 meters) The ...
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0answers
2k views

ASDA-A2 RS-485 Communication Configuration

First of all, I know that my question is very specific for those who have hands on experience with the ASDA-A2 Servo Drive from Delta-Electronics. But I hope that someone will guide me through the ...
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0answers
43 views

How to pick a Balun and transformer for this power line measurement circuit

I was reading this paper here about measuring power line impedance using a network analyzer. It has a little circuit that they used but of course they're not nice enough to include a BOM :) How ...
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0answers
1k views

What is bit-true implementation

What is bit-true implementation (with an example if possible)? I was reading a paper and it was stated "a bit-true implementation of the algorithm on a FPGA was performed." So what exactly is bit-...
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0answers
581 views

Which serial protocol or encoding scheme does this scoreboard use?

I am trying to decode a signal stream coming from a Nevco scoreboard controller: Packets like this are sent every ~2.7 ms. I suspect it is some sort of UART signal because it is on the RX line of a ...
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3k views

why is shadow fading also called slow fading and large-scale fading?

I've encountered several similar claims regarding shadow fading on several books, and have some difficulty understanding them. (1) Shadow fading is called slow fading because the duration of the fade ...
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1answer
2k views

Esp8266 nodemcu v3 connection to usb fingerprint scanner

My project is about making an ioT biometric attendance management using Esp8266 nodemcu and a Morpho usb biometric scanner. So my question is whether is it possible to connect a usb fingerprint ...
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31 views

Creating a low cost raspberry lora node

I'm trying to integrate LORA communication in a project that uses a raspberry pi. I've bought this module to serve as a gateway for testing: https://www.amazon.es/gp/product/B076T28KWG/ref=...
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35 views

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
37 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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1answer
41 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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43 views

what's up with u-law companding when u is 0

https://www.tutorialspoint.com/principles_of_communication/principles_of_communication_modulation_techniques.htm It says that I can get the compressed output of a signal using this: it also says ...
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1answer
103 views

What is the difference between residual phase noise and absolute phase noise?

Studying the characteristics of an oscillator with a phase noise analyzer, but I don't quite understand the difference between absolute and residual noise. Any help would be greatly appreciated
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67 views

Foster - Seeley FM Demodulator Explanation

Consider this Foster Seeley Demodulator If I have correctly understood, its basic working principle is the fact that at the secondary coils (L2) of the Balun there will be two signals equal and ...
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43 views

Are magnetically tunable surface acoustic wave devices commercially produced?

I have been reading up on studies of magnetically tunable surface acoustic wave devices, in general they note the relative velocity change or in some cases a frequency shift if it is part of an ...
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1answer
137 views

How to calculate the 3dB point?

I understand this until the final two lines. How does he get from 27.8766 to 1149.8hz and 7224.7rad/s?
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63 views

What effect do R5,R6,R7,R8 have on the following DSBSC Modulator?

I know that the first 741 essentially adds m(t) and c(t).The gain should be 1 so why do we have 3.9kohms resistance ? What use is it ? The second 741 circuit is a band pass filter . I think there is a ...
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204 views

Demodulation of a 38 kHz IR PWM signal

I want to learn how to demodulate a 38 kHz IR PWM signal.(Such as that transmitted by a TV Remote Control) I know it can be demodulated easily using a TSOP1738 IR receiver. I realize that the ...
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32 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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225 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 ...
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1answer
42 views

Method to find Correlation for a random variable and thereby power spectral density of random signal

I'm trying really hard to understand the segment of text from a standard communication book ( Modern digital and analog communications by B P Lathi). We are trying to find the power spectral density ...
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0answers
167 views

How does the data rate of a CAN bus affect the value of the capacitor used in a split termination scheme?

I'm helping to redesign the CAN bus of an electric car, and we're interested in achieving higher data rates of up to 8 Mbit/s. We have a transceiver selected, a CMC to reduce inductively coupled ...
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0answers
290 views

Circuit to drive a telegraph sounder?

I acquired an old telegraph sounder, marked Western Electric 140 Ohms, and have a Morse code key. What voltage should I drive the sounder with to hear the proper Morse code click sounds when keyed? ...
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0answers
141 views

How to network hundreds of sensors over a serial connection?

So I'm looking for a way to connect hundreds (300-400) sensors (like an accelerometer) together over a serial connection to a micro-controller. The sensors would transmit about 500kbps each. I've ...
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0answers
37 views

Sources of online broadband RF energy data stream?

I am interested in finding recordings of broadband FM radio emissions, ideally in the marine VHF frequencies (156.0 and 162.025), in order to understand carrier artifacts and distortions that could ...
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0answers
68 views

Compressed single-sideband modulation?

I've had an idea for a new form of SSB modulation, using half-angle formulas as a basis for compressing the sideband of a SSB voice transmission. However, this idea seems so simple that I feel it must ...
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0answers
71 views

Computing the received signal

My question may seem a little bit easy but I'm new to these concepts and was hoping if you could help me clarify them by answering my questions. The received signal at the detector writes: $$ y = h x ...
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0answers
508 views

What is Virtual Array Antenna?

What is virtual array antenna (VAA)? I have searched it everywhere but i was unable to find direct answer to this question. I know this concept was built from phased array antenna. Please explain ...
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0answers
388 views

How to reduce SPI bit errors between a Bus Pirate and a BIOS chip?

I need to eliminate bit errors when reading a BIOS chip using a Bus Pirate v3.6. The BIOS chip is still soldered onto the motherboard. I'm using a Bus Pirate probe set to connect the Bus Pirate to a ...
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130 views

USB signal analysis

I have a device that I want to control it has window software that runs it, and a complex interface. I just need a pair of commands, also I know very little about usb device hacking, and signal ...
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0answers
52 views

Compression and communication power consumption trade-offs

Let's say I'd like to save battery power consumption when sending data to remote devices connected wirelessly, i.e., sensor networks. One of the ideas may be compressing the data to reduce the number ...
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0answers
190 views

Sub-1 GHz Narrow Band vs Wide Band

As per the TI document I came across which compares narrow band sub-1 usage vs wide band sub-1 usage mentions a concept called coding gain and its disadvantages. Because of my lack of understanding in ...
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86 views

Definition of “hot” resistor when calculating RMS thermal voltage?

I am calculating the RMS thermal noise voltage of a "hot" resistor of a tutorial sheet for uni. I have used the standard Johnson–Nyquist formulas, but the answer sheet does not include the entire ...
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0answers
818 views

PCIe card powered but not recognized on custom interface

I have a black magic declink mini recorder card that I am trying to recognize on a small form factor linux machine (debian 3.2.46-1 x86_64). I have made a custom interface board with what I think are ...
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0answers
583 views

MIMO with directional antennas

In the context of a competition, I need to set up a wireless link between a base station and a mobile target. The mobile target: -> will always be within the same 180 degree cone from the base ...
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0answers
488 views

Arduino to Serial Cable Encoding Error

I am trying to send data between an Arduino Uno and a Mac. The Arduino Uno is running this simple sketch to print data to serial: ...
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0answers
2k views

Communicate through a VPN link using Arduino Uart WiFi Module

Following describes the configuration of the system and other details. The problem is mentioned after that. If the initial description is too much or not needed, please skip it. I have a VPN (between ...
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0answers
660 views

Connecting 2 Arduinos with Bluetooth

I have been looking on Google for a project that involves 2 Arduinos communicating with Bluetooth. The only examples I can find are with an Arduino to an Android phone. Does anyone have links to let ...
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0answers
904 views

PIC32 read feedback from UART

I'm using a PIC32MX795F512H to set up a Roving RN-131 wifi module using UART. I can communicate with the device but I want some feedback whether my commands are processed or not. I basically need to ...
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12 views

SC18IM700 operation (RS485 to UART to I2C)

I need to create a circuit to talk to a piece of equipment using the I2C bus. I'm on a PC that has an NI serial card with RS485 ports(I'm not sure of the model number off the top of my head). I ...
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1answer
64 views

MC1496 can be used as a DSB SC and AM IC, but their circuits on the datasheet are the exact same. What is the difference between the two?

I am looking at the MC1496 IC datasheet provided by ON here. Figures 1 and 3 show that you can make an AM or DSB-SC signal using this circuit. However, the two test circuits listed on the datasheet ...
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26 views

Sending Serial Data via CAN transciever

I am required to transmit a standard Hex payload through serial com port to a device that has a CAN transceiver. The serial configuration is as follows: 500 kbps, 1, 8, None, 1. The DUT has a CAN ...
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24 views

Receiving image through USB to embedded device via USB CDC

I am trying to send images through the USB port to my stm32f7 eval board. I have taken pictures from webcam and send it by the code below ...
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1answer
50 views

NRF24L01+ (RF Module) for Smart Home Device Communcation

A while back I purchased these RF modules (NRF24L01+) and I am starting a project using them; the project is implementing a network of smart devices as slaves connected to a central wifi-enabled hub (...
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1answer
24 views

Equivalent baseband communication channel

I was reading on my lecture slides (I do not put them here since they are not in English) this statement about equivalent baseband channel models: In typical wireless applications, communication ...