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Questions tagged [communication]

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

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1answer
515 views

RS485 to RS232 conversion?

I need to connect a sensor that uses a RS485 transmission to RS232 or something I can read through the com ports on my data logger. I can't use usb ports or virtual com ports due to the program I am ...
0
votes
1answer
84 views

Connect three HC-05 Masters to three HC-05 slaves

I have 3 Bluetooth modules HC-05 connected to my laptop using an USB-TTL interface and 3 microcontrollers each one has its own HC-05 slave. These devices shall send values to my laptop (each slave ...
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1answer
83 views

RS-485 + iCE40 for better CAN-FD

This is an idea I have been toying with for a while and wanted to get an opinion. When I first heard about CAN-FD I thought it was going to be the answer to this problem. However most mid range ...
1
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2answers
165 views

UART Data Transfer Across Modular Boards

I am trying to create a modular system that uses UART to broadcast the same data to each microcontroller that gets added to the system. It could have 3 or it could have 10 modules added to the system. ...
0
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1answer
158 views

SPI read error with MCP2515

In an attempt to interface a motor controller, battery management system and maximum power point tracking device on a CAN bus, I used the MCP2515 and TJA1050 CAN breakout board. All these devices send ...
0
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1answer
54 views

Meaning of Evolution in LTE (Long-Term Evolution)

The term Evolution/Evolved (E) is everywhere in communications, and simply put i don't understand why. The answer I am looking for is one that will help me know what meaning i should associate with ...
0
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1answer
108 views

How to configure my xbee s2c modules for communicating with arduinos + sensors?

I have two xbee module (fixed on a development board), these boards does not have a individual access pins to access xbee pins (photo included), but rather a RS232 port. As for what I have searched, ...
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2answers
275 views

What is mean by Differential Daisy Chain UART?

What is mean by differential daisy chain UART? And what is the difference between UART and differential daisy chain UART? While reading datasheet I come across this concept if anybody knows then I ...
0
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2answers
422 views

Is a 'timeout' of 0.2 ms for UART communication realistic?

In most examples (from Arduino/STM32/whatever) I see timeouts of 10 to 100 ms for different kind of communication. However, I am wondering how much 'overhead' there is. Assuming I want to send 8 ...
0
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1answer
57 views

Nrf24l01 module works on breadboard but not on pcb

After using a breadboarded nrf24l01 for more than a year, I decided to shrink it and have it on a pcb using the wiring diagram exactly used in the breadboard. I am attaching the pictures of the first ...
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0answers
46 views

Ladder Logic BCD Communications

I have a very limited number of outputs available (4 to be exact) on my existing PLC and need to share 5-7 bits of information to another PLC without having the expense off add-on communication cards. ...
1
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0answers
69 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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1answer
56 views

Do I need to connect the battery to send data to an ESP32 chip?

This may be a basic question, but I'm really new to electrical engineering. I got an ESP32 chip with no micro-USB port. I got with the device a 3-Wire cable one side and USB other side. I have to ...
0
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1answer
91 views

power and signal inside shielded CAT5 cable

I'll use a shielded CAT5 cable for RS485 line. The simplified bus structure is drawn in the picture . I have 130 slaves and their isolated part of RS485 IC is supplied from the supply placed at master....
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2answers
103 views

Setting up a 485 network

I have a problem where my 485 transceiver just get damaged at field, when it's at laboratory everything runs fine, now reading about it I saw that 485 requires a 120Ohm impedance on both ends and bias ...
0
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1answer
132 views

What USB-2 cabling hardware do I need to connect two Windows 10 computers together? [closed]

I want to run a .NET app in each of the two computers, so that they send and receive data through USB-2. What kind of cable adapter will do this? BACKGROUND: I need to build a GUI on Windows that ...
-3
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1answer
43 views

Tail biting Convolution Encoder

I understand how encoder and decoder works but what are theses values ??
2
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4answers
426 views

Raspberry Pi Zero connection to sensor (with I²C or SPI bus interface) over a large distance

SUMMARY: Here is what works: Raspberry Pi (I²C) <-> 1 m cable <-> sensor (I²C) Here is what I'm trying to do (doesn't work, hence question): Raspberry Pi (I²C) <-> 30 m cable <-> ...
0
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1answer
260 views

ESP32 AND CP2102 Serial data reading issue

I have a PCB on which i am taking a 5v - 1A DC power supply , and again providing 3.3v to ESP32 through AMS-1117 3.3v. Basically things are not working on when i solder the esp32 on my pcb but things ...
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1answer
323 views

CRC hardware implementation

What is the difference between these two implementations as the feedback is in first implementation the last reg only but the second implementation last reg xored with the input bit, so, what is the ...
-3
votes
3answers
78 views

verilog assign memory in a memory

I want to assign a memory 64x6 in a memory 64x6 by saying that all the 64 rows in memory_2 will be equal to all the 64 rows in memory_1, how to make that in verilog ?? knowing that it is very easy in ...
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0answers
106 views

Logic analyzer not shown signal

Good day. I am trying measure signal on ISO 9141 K-line - bidirectional serial link using logic analyzer. The device is Atmega based device with L9637 K-line driver chip. Problem is that, no signal ...
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0answers
59 views

Send data from MCU to Embedded Linux CoM

I'm using an ATSAME70Q21 MCU to record 32 channels of analogue data (via SPI ADCs) and 32 channels of digital data (via GPIO). My embedded device has an iMX6-based CoM (Toradex Apalis), which runs ...
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0answers
25 views

Labelling on non-linear constellation

I have a symbols with constellation that does not, suit any known modulation type. For now call these symbols $C_i$, where i = 1,2,3..k. The transition probability of each symbol to another one is not ...
0
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1answer
220 views

understanding of UART , if two devices share a common ground. How do they get to the same voltage level for a save data transmission?

My question is related to the common ground in a UART communication. So far, what I understand how communication in general works is: Distinguishing the voltage between two cables (one is a GND and ...
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2answers
49 views

Connecting mixed-speed multiple serial devices to two microcontrollers

I'm trying to figure out the best way to integrate all devices flawlessly on the 8051 based microcontrollers. If each device was the same low speed, then I could multiplex each and every one of them ...
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0answers
79 views

How to wire RJ12 to db9f modular adaptor?

I have a RJ-12 to DB9f modular adapter. There are 6 wires that come out of the adaptor (White, Black, Red, Green, Yellow Blue) - these, as I gather from pin out diagrams, correspond to the 6 jacks of ...
0
votes
1answer
109 views

Which cable for 230.4 Kbps RS-232

I have to communicate between a sensor module and micro-controller board. The sensor module uses UART at 230400 bps. I have used a MAX3227 on sensor module as well as micro-controller board. So, the ...
0
votes
1answer
72 views

What do I need to do to connect an ADC IC to a Adam 6066??Is it even possible to read the inputs from the ADC chip?

I am working on a input array that uses a ADC (MCP3208 or something similar) to read in several analog inputs and convert them to Digital signals that go into an ADAM 6066 Module. What would I need to ...
0
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2answers
55 views

suggestions for a ~20cm 2 way wireless communication between arduino like devices

I am trying to build a system where, when and only when someone is within close proximity, about 20 cm or so, two arduino like devices can communicate wirelessly. I want to be able to communicate ...
7
votes
6answers
3k views

Why is “wavelength” used as a unit for the length of an antenna?

We often refer to antenna size relative to wavelength. For example: a 1/2 wave dipole is approximately half a wavelength long. Wavelength is the distance a radio wave travels during one cycle. (...
0
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1answer
59 views

How this COM communication should look like?

I am trying to rewrite a small utility tool for my bike computer Mio 105. Unfortunately there is not any API to do that, so the only thing left is reverse engeneering. So I have set up a USB sniffer ...
0
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1answer
71 views

LED as transmitter and photodetector in the same circuit?

As in this answer I plan to use a 5V neopixel RGB LED as both transmitter and receiver to transmit information between ATMega328 boards via fibre optic cable. (This is the Forrest Mimms strategy, for ...
0
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3answers
562 views

Symbol vs. Word (Digital Communication Theory)

So I'm trying to understand and link up the different chapters I've studied in a communications module. So here goes I understand a Pulse Code Modulation System is made up of the following broad ...
0
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3answers
283 views

Serial Communication via Mosfet using UART instead of PWM

Is it possible to send a uart signal to a mosfet driver instead of a PWM signal. I would like to establish wireless communication with a receiver and send it a data string using amplitude shift keying....
5
votes
4answers
2k views

In one-way asynchronous serial communication, how does the receiver sync up its bytes?

I want to make a serial system over RF to receive messages sent from a computer, so I can understand how digital radio works on the bare metal. The one part I don't understand is how a sender and a ...
1
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3answers
569 views

How is the phase of a local oscillator synchronized to the carrier for demodulation?

How are phases of a wireless TR/RX pair synchronized for coherent demodulation? I understand PLLs will match the frequency of the local oscillator to the carrier via maintaining a constant phase ...
0
votes
1answer
101 views

Can we transmit a PSK modulated signal with YARD Stick One?

We are working on a project to produce a simple walkie talkie repeater. We have a RTL SDR, which we are using to reverse engineer our signal. Using this + URH, we think our signal is PSK modulated, ...
0
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0answers
134 views

Coherent FSK Modulation correlation coefficient derivation

FSK has a large bandwidth requirement and its minimum bandwidth is around \$4 B_T\$, where \$ B_T \$ is the bit rate. In a coherent FSK system the signals \$s_1(t)\$ and \$s_2(t)\$ representing bit ...
0
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1answer
56 views

How to receive data from RS-422 or RS-232 device in linux

I'm very new in this linux device driver and communication things. If i have to connect this kind of devices with a computer, and receive the data, than how should i start it? should i create a device ...
0
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1answer
37 views

Inter Device Expandable Network Protocol?

Currently I am working on a project where I need to install several peripheral devices in the network along with a master. This total system have some industrial application. I need to have the ...
0
votes
1answer
223 views

WPC Communication (Modulation)

I have found this image and wonder how to calculate or determine "Cm", because I like to simulate this circuit in LTSpice. Also should I use a Mosfet or a voltage controlled switch? Can someone help ...
2
votes
2answers
179 views

How are the passband filters in SDRs able to select such a wide range of frequencies?

I was wondering how do SDRs adjust their passband for a such a wide range of frequencies? The normal RF chain is, passband RF filter -> Mixer -> IF or baseband Some SDRs can select their passband ...
5
votes
5answers
2k views

How does a device (dashcam) recognize if it is connected to a computer or a power source? [closed]

I have this A118 dashcam, which I want integrate with a Pi. I wish to record onto it mounted SD card when driving, and once home within WiFi range, to download the files on the SD card through the Pi ...
2
votes
1answer
83 views

How can we find the signal power of \$x_{out}(t)=\frac{1}{2}Am(t)cos \theta\$?

I am trying to solve the following question: I have partially worked out the problem and we have: \$x_{out}(t)=\frac{1}{2}Am(t)cos \theta\$, which is the output of the LPF. and \$x(t)=Am(t)cos (2\...
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1answer
69 views

Recieve serial data on multiple pins ATTINY85

I am working on a project in which multiple ATTINY's need to send numerical data between each other. In most cases the ATTINY wil have to receive multiple streams of data on different pins. See the ...
3
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3answers
119 views

Does an analog filter with complex impulse response exist in application?

Do we have in practice any analog filter that has a complex impulse response? Or they must have a real impulse response? Particularly, I am looking for a low pass filter that passes only a band in ...
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2answers
200 views

How to deal with PS/2 keyboard input and CPU interrupts

First of all, I'm not sure if this is the right place to ask this question or not. It was either here or the Computer Science stack exchange site, but I thought perhaps it would be better posted here ...
0
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1answer
51 views

USART Communicatior AVR

I want to establish a communcation between my ATmega32A and PC but there's a line that I don't understand. The datasheet says that:"When data comes in,the RXC0 bit in UCSR0A will be set,and you can ...
0
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1answer
142 views

How to transfer data between arduino and mysql data base? [closed]

I am trying to create a database that communicates with the arduino to execute functions (such as activating leds) and read sensors to store the values in the database. I am confused on how to make ...