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Questions tagged [communication]

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

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Interfacing Dual-Channel ADC with Arduino for Wireless Projects

I want to interface a dual-channel ADC (Analog Devices AD4632-16) with an Arduino that offers integrated wireless communication capabilities, such as Bluetooth, BLE, or Wi-Fi. I'm encountering a ...
Morena Fabozzi's user avatar
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Difference between radio transmitter roll-off and bandwidth-time (BT) product

For any radio transmitter, the output signal will likely have a shape filter to manage bandwidth. However I am struggling to understand the relationship between a roll-off (e.g. 0.35) and a bandwidth-...
toddy's user avatar
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What is the best way to understand if nRF24L01+ still works properly?

I continuously transmit some data from one nRF24L01+ (nRF) to another one. After a long transmission time, I often experience that the transmitter stops its transmission at a random time for no reason....
adba's user avatar
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Can anyone explain how this ring modulator circuit works? [closed]

This is a transformerless ring modulator used to generate a DSB-SC AM wave.
Alla Janardhan's user avatar
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1 answer
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STM32 - Implementing UART to USB convertor

Considering STM32 Nucleo Boards, implementing a communication by serial port with a computer is a matter of using UART on the Nucleo Board and connecting it to the computer via USB, where you emulate ...
Humphrey Appleby's user avatar
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0 answers
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Other functions of resistors in HART communication use

"I'm trying to understand the additional function of adding a resistor in HART communication. In my reading, the author stated that the resistor provides impedance between the HART transmitter ...
Angga Amalul Ahli's user avatar
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SCL line Pulled Low all the time

I have made a custom PCB with nRF52840 and Three slave Devices(IAM-20380 Gyro), (ADXL372 Accelerometer), (VCNL4040 Proximity ) Sensors. All slaves are connected to one I2C Bus When I plug only power ...
Zunuran Nasrullah's user avatar
1 vote
1 answer
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How can I configure RealTek RTL8211F for 100Base-T?

Introduction I'm planning to use RealTek RTL8211F Ethernet PHY. I have an example schematic. Problem The problem here is that the RJ45 Ethernet connector 48F-01GYDXNL is very difficult to get and I'm ...
euraad's user avatar
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Replacing MAX485ESA IC into a RS485 module but not working

I have been struggling a lot with a MAX485ESA IC I bought from aliexpress. What I want to do is replace the component from a rs485 module. For some reason they don´t work and I was wondering if anyone ...
user2808169's user avatar
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SCI-TX doesnt work properly (Serial communication)

Part Number: TMS320F280025C, Other Parts Discussed in Thread: LAUNCHXL-F280025C, C2000WARE, I have a simulink model for a power electronics project and i want to see detailed data using SCI-TX port in ...
vona's user avatar
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Communication between Microblaze and RTL IP core

I have done an ethernet project (Echo) (TCP/IP) using vivado block design and the board used is Artix A7 and MICROBLAZE PROCESSOR WITH AXI_INTERCONNECT. I was able to use AXI_GPIO connected to an led, ...
Yosh Sinjab 's user avatar
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Comparing between orthogonal BPSK and differential BPSK

Suppose two modulation schemes, orthogonal BPSK and differential BPSK. In orthogonal BPSK, we transmit $$\textbf{x}_{A}:= [x[0], x[1]]^{T}=[1, 0]^{T},$$ and $$\textbf{x}_{B}:= [0, 1]^{T}.$$ This ...
PSH's user avatar
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How do I set up the wiring for a SPX-18572 and Arduino Leonardo to use LoRa?

I was trying to find a guide to use the SparkX LoRa SPX-18572 with an Arduino Leonardo, but I could not find any guides to using these technologies online. I'm hoping someone on here knows how to use ...
Vishnu Sharma's user avatar
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DS18B20 responds with a precense pulse, but doesn't send data

Pretty much the title. I used normal GPIO with direction flipping to do comms. The sensor pin is normally high (from the pullup), and gets pulled low in response to the reset pulse. The data however ...
nottherealfaraday's user avatar
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1 answer
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SPI slave is sending one byte twice at a very specific time in data packet and causes corruption of the whole data packet

I am trying to communicate with a display device (master) which sends two type of data packets with 50 kHz clock. One data packet is 16 bytes and one is 32 bytes long. The data format is as follows: ...
saki gujjar's user avatar
1 vote
1 answer
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How is SM712 TVS array suitable for use with MAX485 in an RS485 driver circuit?

I have an RS485 driver circuit consisting of a MAX485 driven by an STM microcontroller. I was looking at TVS diodes for basic protection from electrostatic surges from wiring and handling, and found ...
nottherealfaraday's user avatar
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1 answer
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max3232 disconnection suddenly - problem

Hi I use a Max3232 chip to connect the RS232 between the microcontroller(STM32F103) and an HMI, the problem is that sometimes this connection will be disconnected and no longer work, this may happen ...
Ashkan Khajeh's user avatar
2 votes
3 answers
126 views

Running communication on low voltage power cables

At work we running seismic stations that are cabled together over distances of several kilometers. The cables have some pairs for power and some for communication. As the stations were installed in ...
MortenSickel's user avatar
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Unable to communicate with SPI based display board

I need to communicate with a display board that is acting as master and my board will act as slave. The reference document says that " Totally 26 bytes for communication between display and ...
saki gujjar's user avatar
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2 answers
193 views

STM32 UART without HAL library

I am writing register level code for STM32F4 & in my code there is a timer for calculation of the frequency of an input signal. I am trying to implement a UART for sending calculated data to ...
MSB's user avatar
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5 votes
3 answers
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Best protocol for daisy chain communication between many small microcontrollers

I'm working on a project where I'd like a large number of small microcontrollers (100+, something like an 8-bit PIC, but flexible on what I use) to each perform audio synthesis behavior defined by an ...
Emmett Palaima's user avatar
-1 votes
1 answer
87 views

Frequency demodulation circuit

This is how I designed the frequency modulation circuit, but I cannot perform the demodulation process. It can be done with a PLL but I couldn't install it. How can I demodulate?
Orhunemre's user avatar
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How to read data from a 6DOF sensor by SPI?

I am new to firmware programing. I have a 6 DOF sensor module and want to connect to a ESP12F development board to read data. Please see below picture for my 6 DOF sensor module. Here are my current ...
RamondC's user avatar
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Why do we get increase in BER with increase in Eb/N0 of the signal?

I'm working on a problem of MSK modulation scheme. I have passed my modulated signal through SUI channel Models and AWGN. But As I want to do analysis on the performance of SUI channels I'm getting ...
Fatima Ismail's user avatar
2 votes
2 answers
259 views

How to compute the energy efficiency in bits/s/watt

The energy efficiency (EE) in wireless communications is usually calculated as the ratio of data rate to power consumption: how many data (in bits per second) are delivered per consumed power (in ...
zdm's user avatar
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7 votes
2 answers
2k views

How is power line communication (PLC) possible without screwing up the line as a viable power source?

[I am not an EE so bear with me with this] I've been learning about power line communication and see that it is mainly achieved by modulating the carrier signal (for this discussion let's say that's ...
Leftover Salad's user avatar
0 votes
1 answer
93 views

Response partly lost in Modbus RTU over RS485 communication

I have developed a Modbus slave which uses ATMega8A and MAX485. In a new lot of the devices, while testing them on my PC using QModMaster, the response that I get has one byte in front of it, and cuts-...
nottherealfaraday's user avatar
1 vote
1 answer
40 views

6GHz GMSL2 signal over UTP, calculating insertion loss over cables

I'm doing some research into having CSI cameras at a distance of around 3m from a computer and am thinking of using a CSI to GMSL2 serializer deserializer pair, in particular, the MAX96724 and ...
Harrison's user avatar
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26 views

Receive Antenna Design Consideration in Dual Antenna LF RFID System

I am working on constructing a loop antenna pair for an LF RFID application. The antenna is quite large (4' x 6'). I was able to successfully wind a transmit (Tx) antenna and tune it such that it ...
tomhebe's user avatar
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2 answers
262 views

Inductor of twisted pair cable and of a wire

I found two calculators on internet for calculating the self inductance of a wire and an other calculator for calculating the inductance of twisted pair. Here are the results for the following ...
Jess's user avatar
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Laser communication system to transmit Audio

The audio in these two circuits is only transmitted when they are both connected to the same battery (Vcc), and only the laser control audio level not the transmitting process. When I connect the ...
Alaa's user avatar
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0 votes
1 answer
66 views

What is optical wireless communication? [closed]

What is the term optical wireless communication? According to my point of view, in optical communication there msut be a medium so the refractive index should be capable of keeping the wave inside the ...
Madara Thalpavila's user avatar
2 votes
1 answer
347 views

Does "heat" affect signal integrity?

I have a PCB that is having signal integrity issues. This is a four-layer board, the top and bottom layer is signals and power and the inner two layers is a solid ground plane with no breaks in it. My ...
JoeyB's user avatar
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2 votes
1 answer
388 views

STM32 - HAL_UART_Receive first byte is always zero

I am implementing communication between Nucleo-F072RB board and an evaluation board with TI BQ75614 BMS IC. I have succeeded to communicate with the IC using 1 Mbps UART interface, successfully ...
block3r's user avatar
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0 votes
3 answers
271 views

Understanding RS422 and choosing drivers

I want to communicate 2 MCUs using RS422. I need to have some isolation, so the driver should have 3.3V side and 5V side, isolated. All I can find in the market are half-duplex drivers, I understand ...
Developing Electronics's user avatar
2 votes
0 answers
46 views

Serial communication between Arduino and computer cuts out after a while and doesn't reconnect. Why?

I've just kept an experiment running the whole weekend. Arduino controlling heat and humidity and sending data over serial to my computer. I had a python program reading Serial data and populating an ...
Popeye's user avatar
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0 answers
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Experiments with Screened Lines, the diameter of the inner and outer conductor (RG174)

I am refering the communication engineering related coaxial board. There they used conductive cables as RG174 and I need to find the relative permittivity, diameter of the outer conductor and inner ...
Hasalanka Nagahawaththa's user avatar
0 votes
2 answers
115 views

Token Passing: Multi Master Protocol Initialising problem

I am into developing a protocol using Token Passing topology. For Physical Layer RS485 will be used. All the nodes will be connected in a daisy chain. No node is initially known the address of the ...
Israr's user avatar
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1 answer
198 views

Implementing a light software stack on STM32 to send and receive data using 433Mhz RF modules

I need to send a 12-bit data continuously from one system to another using 433MHz RF modules. The transmitter and receiver systems uses STM controllers (STM32L010F4) which are connected to the radio ...
nottherealfaraday's user avatar
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0 answers
44 views

How can I correlate a RSSI value to a distance measurement more efficiently?

I want to develop a trilateration algorithm using 3 fixed advertising beacons in different parts of a room and a mobile receiver which continuously gets the RSSI values of the 3 fixed beacons and ...
Andreiul's user avatar
0 votes
2 answers
162 views

Establishing communication between laptop and an oscilloscope [closed]

I am trying to establish a connection between this oscilloscope and my laptop using the USB port on the oscilloscope. This is my code in Python: ...
Jonathan_the_seagull's user avatar
0 votes
0 answers
15 views

Effect of 2ASK Sampling Points on Bit Rate

"I reduced the only one sampling points while using 2ASK modulation, and the bit error rate increased by 20%. Can you help me with this?" Question happens in this line t = 0:bitDuration/100:...
Aliang's user avatar
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1 vote
2 answers
246 views

Need advice on achieving 1 km non-line-of-sight wireless communication without internet

I'm currently working on a project that involves establishing a reliable non-line-of-sight wireless communication link with a range of 1 kilometer or more. The project does not have internet access, ...
Lakshmi Vara Prasad Guduru's user avatar
0 votes
2 answers
77 views

What is the communication protocol used by non-expansion card USB ports to communicate with CPU?

USB ports can come as expansion cards, like this: Now obviously, since this is a PCIe USB card, the communication protocol used by this expansion card to communicate with CPU is PCIe. But what about ...
Noob_Guy's user avatar
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13 votes
4 answers
2k views

How were standard serial port baud rates chosen?

How were standard serial port baud rates chosen? 1200, 9600, 115200, aren't the numbers we'd expect (powers of 2 or 10), but don't seem random either. Wikipedia states Many of these standard modem ...
SRobertJames's user avatar
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0 answers
33 views

How can I make a basic BlueTooth communication between a cellphone and MXCHIP EMC3080-P module?

I'm trying to use the EMC3080-P module from MXCHIP, because it's used in some applications from ST, the company where I had the microcontroller I'm using (for example, the B-U585I-IOT02A discovery kit ...
santiago deliotte's user avatar
1 vote
0 answers
146 views

PIC16F UART Receives only the first byte

I'm currently working on a PIC16F18855, I'm trying to set up the communication part. My setup is as follows: A PCB connected to my computer via a TTL232 cable. The PIC16F18855 is clocked at 32Mhz, the ...
Benito's user avatar
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4 votes
1 answer
268 views

What is the term for a code that has duplicate or redundant/equivalent symbols?

I'm having a hard time performing a literature search because I can't find the right search terms. I'm looking for what you name a code over some alphabet that treats multiple symbols equivalently. E....
user1816847's user avatar
6 votes
1 answer
554 views

What is 3 wire I2C?

This is first time I'm seeing 3 wire I2C and have no idea how it works. How can I implement it in STM32 in Cube IDE using its GUI? I'm using TI TPS23881 (PSE controller) in one of my projects and I ...
Muhammad Ali Jayyad's user avatar
1 vote
1 answer
478 views

How can I find which serial port is connected to Nucleo board via ST-LINK?

I have a Nucleo board connected via USB to ST-Link running on Ubuntu Linux. ST-Link works well in that it can program the board. I would like to use the built in virtual serial port, but am not sure ...
SRobertJames's user avatar

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