Questions tagged [communication]

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

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WS2812b data over 35m line

Single WS2812b LED are connected over 35 meters (115 feets) UTP Cat. 5e cable and it's not working as expected. Getting wrong colors. Another WS2812b placed in parallel (not chained) on board close to ...
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1answer
22 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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2answers
46 views

Addressable ICs similar to WS2811 for monochrome LED [closed]

For my home decoration, i want to individually address the led strings . Since one string is of a single color, i need an ic with serial communication similar to WS2811 ic but monochrome to control ...
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76 views

SPI doesn't work properly between two STM32 microcontrollers

I'm trying to use SPI communication between 2 boards (custom design). Register programming approach is used. Sometimes SPI works fine, sometimes it doesn't. When it doesn't work properly, one of first ...
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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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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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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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2answers
125 views

What are the units used in Shannon formula calculation?

I'm a CompSci student with absolutely no background in wireless communication who recently needs to do something with the Shannon formula: $$ R = W log_2\bigg(1+\frac{P_t H^2}{N_0 W}\bigg) $$ I need ...
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2answers
60 views

Are there any real world examples of encoding data in EM polarization?

Data can be encoded by modulating the frequency, amplitude and phase. But I can't find any references for encoding data in the polarization of EM waves (either analog or digital). This is probably for ...
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26 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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2answers
51 views

Underwater communication trough cable

I wanted to build a device which can stay and move underwater (let's say, for instance, 15m underwater). Since RF frequencies are very attenuated by water and VLF antennas would be too high, I was ...
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1answer
37 views

CAN - Tranceiver @ 5V VS Tranceiver @ 3V3 Immunity

I would like to change a 5V CAN transceiver on my board into a 3V3 CAN transceiver. Nevertheless as I am clearly not a specialist of the CAN protocol, I am afraid of doing a big mistake ! I think it ...
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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 ...
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2answers
100 views

How to drive the gate of a MOSFET with a PWM like signal

I'M trying to use MOSFET as a driver for my 10W LED with 12V supply. This LED will be used as a transmitter with signal coming from Arduino nano. I'm using IRFZ44N MOSFET with a Vgs(min)=2V and Vgs(...
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1answer
40 views

STM32 BLE profiles - multiple sensors active ST BLE Sensor App

I have done the MOOC for the stm32wb55 BLE profiles and now I am trying to introduce more BLE characteristics. I managed to make the sensors work and to transmit them to the ST BLE Sensor app. However ...
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1answer
42 views

Determine output filter using the bode approximation

Given that the carrier frequency Fc and modulation input frequency Fm are known, how would I use the bode approximation to determine an output filter, if the carrier frequency component must receive ...
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5answers
2k views

Decode/Analyse the following UART signals

I have sent a 2 and a 9 using UART. The baud rate is 9600, there is no parity, and it has 8 data bits. As we know 9 is represented as 1001 in binary. However, this is what I get from my UART signal: ...
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1answer
43 views

Is this the right convention for SPI modes?

The table shown here, under "Clock Polarity and Clock Phase" doesn't agree with my conclusions from table for SPI modes on Wikipedia. I'd like to distinguish between whether the one on the ...
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23 views

Piezoelectric Backscatter Communication

I am currently working on a project. We have a metal bar as test object and at each end we stuck a piezo disc. I am trying to use one piezo as a sender and the other as receiver or reflector. I tried ...
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1answer
34 views

Coherent and non-coherent detection

Let's say I am simulating something as simple as BFSK. It has two symbols, one entirely on the real plane, and one entirely on the complex plane for representing let's say zero. That is how the ...
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1answer
36 views

why base stations have 2 receiving antenna and only one transmitter?

I read that a base station is divided up into sectors to accommodate multiple service providers on a single tower. why each sector has two receiving antennas and only one transmitting antenna, As we ...
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1answer
50 views

How to find RPM from the square wave of a MSD box

I am trying to make a tachometer for my car. I am using a MSD6Al-2. The box outputs a 12 volt square wave at a 20 % duty cycle I talked to someone at MSD and they said you'll get a signal every time ...
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2answers
48 views

Can we get higher internet speeds even with low BW message signals?

Consider a case where i’m listening to a recorded audio on internet.Basically the useful audio Frequency range lies b/w 40hz to 4khz, which has a BW of 4khz which is pretty low ,does that mean the ...
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1answer
29 views

Understanding OSI Communication Model in Hardware

I have gone through the OSI communication model and the associated levels. But I do not understand on how is this implemented in the Hardware level. Or let me put it like this. Suppose we have a ...
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1answer
39 views

Wrong SPI Signals in Logic Analyzer

We're trying to send some informations above SPI. So we've coded a few lines of code for that purpose. But in the picture you can see, sometime data cannot be retrieved accurately. The original data ...
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20 views

Is \$ H\left\{x_h(t)\right\} = H\left\{x\left(t-\frac{\pi}{2w_c}\right)\right\} \$ where \$H\$ is Hilbert transform

Accordind to my understanding of the following: $$H\left\{X(f)\right\} = -j\;sgn(f)\; X(f) \qquad(1)$$ my work so far: since \$ x_h(t) = x\left(t-\frac{\pi}{2w_c}\right)\$, Their Hilbert ...
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1answer
38 views

Depict Adress Resolution Protocol using Mirobits

My school assignment says In this task you will implement a simple version of Address Resolution Protocol (ARP). A button press on one micro will send a request to the other micro for its “MAC” ...
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1answer
46 views

Finding the amplitude of a multi-tone signal

How do you find the amplitude of a signal consisting of multiple sinusoids with different frequencies such as $$f(t) = A\cos(\omega_1t)+B\sin(\omega_2t)\text?$$ I'm thinking that you take the ...
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0answers
31 views

Between PC and multiple microcontoller, data transmit and recieve over wifi

I am working on project, in which 4 microcontrollers are involved and each microcontoller is controlling a data aquisition system that reads 2D array(64×64) of sensors So i want to start the data ...
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1answer
51 views

Is there a term for something like a “routing scheme”?

I would like to know if there is any common term to describe the routing of devices to conceptually understand the setup. E.g. something that explains how the devices are connected to each other on a "...
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1answer
44 views

What is the difference between these two SSB phasing method block diagram?

I was searching the block diagram of SSB phase shifting method. I found these two different block diagram: I thought the second one is wrong but this one is used many times in different websites. I ...
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1answer
43 views

Auto-negotiation Disable Issue [closed]

How can I set the ethernet speed ?
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3answers
78 views

Probability of error of a system?

Let bits 0 and 1 be equi probable. For bit 0, any value between -0.3 V and 0.3 V can be taken with equal probability. Similarly for bit 1, any value between 0 V and 1 V can be taken with equal ...
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2answers
100 views

When we raise a signal to a power n, does the bandwidth always gets multiplied by n?

I know that when we have a message signal $$m(t) = \cos(\omega t)$$ when it gets squared, its bandwidth gets doubled, because $$\cos^2(\omega t) = \frac{1}{2}+\frac{1}{2}\cos(2\omega t)$$ But is ...
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1answer
35 views

How to plot BER Vs SNR of a received signal

I am using USRP to transmit and received MIMO frames similar to Wi-Fi standard that I created on my own. After receiving the signal, it is processed as described in the standard. While I plot the ...
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1answer
48 views

How to calculate the total signal strength and phase shift of multiple signals in a reciever

I have a simulation to make where I have an array of transmitters that transmit the same signal. At a random point, which I have to consider as a receiver I have to measure the phase shift of the ...
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1answer
53 views

What limits the maximum number of nodes of a RS422 bus? How to check if N>10 nodes is possible without repeater?

I have 13 identical devices which communicate with a host via RS422. None of them are addressable (they assume point-to-point connection). I would like to string them in a RS422 bus. I thought of ...
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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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2answers
57 views

Can I improve serial data signal using reversed output on a twisted pair?

This is a serial data communication with one or several transmitters and one or several receivers. From the transmitter I have one serial data output (D+) and a second, reversed serial data output (D-...
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2answers
51 views

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
66 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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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
32 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
78 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
22 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
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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2answers
79 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
42 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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