Questions tagged [communication]

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

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RS-485: what happens when bus contention occurs

I'm refering to an half-duplex RS485 application which consists of a master and multiple slaves like in the circuit below (I'm using an ST3485). simulate this circuit – Schematic created using ...
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1answer
84 views

Is Lora maximum transmission 1 km in real?

I'm new to wireless communication and Lora. I'm using Lora Ra-02 and Arduino UNO and small 800 Mhz antenna. I'm using Arduino website library. How can I increase that range? What do I need to do to ...
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37 views

i2C connection setup

Following the diagram below, is it wrong to use the MCU 5V to supplying both SDA and SCL lines? I applied this into my circuit and my device are not communicating when connected to this circuit.
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Why is there a low pass filter in a DSBSC demodulator?

In analog communication, DSBSC (double side band suppressed carrier) is way of modulating signal. In this the carrier is simply multiplied with the message signal. At the demodulator, the carrier is ...
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1answer
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problem on pin mapping to make serial communication between laptop(DB9) and PLC(DB25) via rs422

I'm trying to connect my laptop (COM port) to mitsubishi PLC A0J2 cpu(via it's DB25 connector) via RS422 (Read and Write data). what I think is that I have to bring the voltage level to TTL(maybe ...
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2answers
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How to ensure all nodes on CAN bus have received the message

I know that that the ACK bit will be driven by the receiver of the CAN message. I'm wondering what would the situation be if you have multiple nodes listening to the same message. How would you ...
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1answer
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Blocking test for receivers

In a receiver blocking test, I always see the description that "the test is peformed at a signal level 3dB above the required sensitivity". So what is meant by testing the receiver at "...
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0answers
48 views

What technology should I use for tracking small boats venturing upto 50km in the sea?

2017 south India was struck by a cyclone Okhi which took many small fishermen's life. I'm an electrical engineering student and want to do a project regarding tracking these boats and implement an ...
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Calculate bandwidth of wide-band FM from spectrum graph

I want to calculate the bandwidth of my signal output from the graph it results from application of the FFT. I can apply the Carlson formula knowing that I have all the parameters :$$B = 2(\beta +1 ...
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2answers
86 views

Why do simple optical fibers usually support only half-duplex communication?

I'm a newbie to the subject, so a thorough answer would be very helpful. I was curious as to why simple (single) optical fibers usually don't allow full-duplex communication. To my understanding, all ...
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2answers
178 views

Does the bandwidth of an NBFM modulation change depending with the modulation index?

Hello electrical community ! I'm learning about FM Modulation ,especially with narrow Band FM.And I was wondering if the index of modulation BETA affect the bandwidth of the modulated signal. In fact ...
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Leaky Bucket Example

I have an image below of a leaky bucket image that I am trying to understand for my telecommunications class, and I was hoping for some guidance/verification if my train of thought is on the right ...
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How can one compare resonant and non resonant antenna based on parameters like Directivity, Radiation resistance, Cross polarisation, Efficiency?

Basically I want to make a choice between two antennas when ample space is given objectively based on parameters 1.Directivity 2.Radiation Resistance 3.Cross Polarization ratio 4.Loss resistance I'll ...
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1answer
156 views

What is difference between resonant and non resonant antennas?

I don't know if it's right place to ask it, but I searched google and books the answer I get seems to be like resonant antenna have small bandwidth and have standing wave instead non resonant antennas ...
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Find the 4 pins for i2c on printer consumables' chip - konica minolta

I just saw this video https://www.youtube.com/watch?v=Wwd5UCi9Huw about forcing an OEM (= original) printer consumable chip to reset its lifespan counter. However the chip on that vid has 4 ...
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How to synthesize a analog frequency divider circuit?

Basically I am struck with a usual circuit of carrier regeneration using Square loop and PLL now the final part of feed forward path is a frequency divider. The best way I thought is using a frequency ...
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Is there any applications for short data transmission?

In some applications like IoT, the transmitter turns off for power saving when the transmission is not needed. I'm not sure but I heard that: when the transmitter is on, the data length - in time - ...
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1answer
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Address-free communications between microcontrollers in any topology

Suppose I have 9 microcontrollers each on their own PCB, connected in a square grid. Is there a way I can get a single node to communicate to all the other nodes, be able to address them individually, ...
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1answer
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What is the difference between capacity and throughput in context of wireless/cellular communication?

From what I understand: Throughput tells you how much data was actually transferred from a source at any given time Bandwidth tells you how much data could theoretically be transferred from a source ...
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Serial Communication Arduino to NodeMcu

I'm looking to take inputs via keyboard by Arduino mega through USB cable (Serial monitor Inputs), and send them to nodemcu through serial communication (TX - RX ) so I can send it to a server (from ...
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2answers
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Are “switching circuit” and “circuit switching” related?

"Switching circuit" is a concept opposed to logic circuits. Both are used for implementing digital circuits. The first link says From 1934 to 1936, NEC engineer Akira Nakashima published a ...
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MDB Protocol - Communication between a PC and a payment terminal

I'm working on a project where I need to create a communication channel between a standard PC (running Windows) and a payment terminal (a NFC credit card reader, an Ingenico iUC 180B). I'm a junior ...
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1answer
52 views

How to communicate over long distances (60 m) using serial communication from multiple serial devices connected to my PC

Previous post As per my previous post which involved determining which type of serial connection is appropriate i.e. RS232, or USB. This was clearly RS232. As a follow on post to that question. I have ...
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Can optical fiber communication be used to transmit analog signals?

I am confused because I read the LEDs/LASERS used in optical fiber have finite levels. If for instance ASK is used to transmit digital baseband data then will the LED or LASER be able follow the ASK ...
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4answers
133 views

How do a single-side band signal and a double-side band signal look like in time domain?

I understand what SSB and DSB mean in frequency domain. For SSB, the signals appear at one side of the carrier frequency. For DSB, the signals appear at both sides of the carrier frequency. So now ...
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1answer
37 views

Multiple differential tranceivers on single bus

Im using a few moduls of rs422 tranceivers connected on single bus Easy module has transciver with TX input, RX output power end differential pair output and input - but no EN pin to hold the ...
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1answer
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Digital Communication \$T_x\$ and \$R_x\$ for Dish - Coaxial Cable - TV Setup

I have a question in mind regarding transmitters and receivers. Let's say we have a dish then a coaxial cable connecting our dish to the TV. Can we consider the Dish as a transmitter \$T_x\$ and the ...
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1answer
60 views

What are examples of complex communication protocols that do not need a 7 layer OSI model to describe them? [closed]

I am trying to dissect an existing design of a custom communication protocol that shall make use of infrared pulses to communicate between only 2 devices. The design is architected in such a way that ...
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2answers
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Advice for an inter device sequential communication system

I'm looking to develop a modular IOT system which has a single master component and can be connected to multiple devices which can be used to turn on/off relays separately for my college project. The ...
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2answers
34 views

Two slaves on the same I2C bus, both response to address check, one working properly but the other is not

Ok, I will try to keep it as short as possible. I have a GY-86 breakout board, the schematic is added below. As seen, MPU6050 and BMP180 are connected on the same I2C bus. I do also have an Arduino. ...
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3answers
81 views

USB to Serial (RS-232) cable not displaying data on Arduino serial monitor

My previous post (Pictures from the previous post as well) So far all of the answers and comments yielded no solution to my problem. This post offers a different method to communicate serially with ...
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4answers
57 views

Cannot communicate with serial device via an Arduino Nano serial communication

I am trying to communicate with an RFID reader via its serial port. The serial port has an RS232 connector on it. I also want to display the RFID tags ID on a 16x2 LCD screen using an Arduino. I, ...
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1answer
102 views

How to design Power Line communication with line transceivers?

I am trying to design a communication system that will send data signals over a 400V DC voltage line by using line transceivers. I attached the LTspice schematics below. The transformer is for ...
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1answer
57 views

Configure SPI Slave to handle data coming at the wrong time

I am experimenting with the SPI protocol (fast speeds where 5 bytes of data is transferred in slightly less than 500us) on the STM32F410 configured as a SPI full duplex slave. A master device sends a ...
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3answers
90 views

Is this analog switch good for UART lines?

Currently designing a circuit to switch between two UART lines using an analog dpdt switch. Been searching for a while and found the BL1532. The datasheet says it's a DPDT USB2.0 Analog Switch, but ...
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1answer
34 views

About best way to perfom checksum

From my knowledge,checksum can be done using Xor or adding the bytes of the frame...i have to create a communication between ATmega32 microcontroller and matlab to perform some functions...which is ...
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1answer
113 views

Switch between two serial ports

I'm working on a device that is connected to 2 serial ports (both TX and RX).The first serial port is connected to a CP2104 USB chip, the second serial port is left open with TX,RX,GND,3V pins. I want ...
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2answers
51 views

Are USB and/or Ethernet payload agnostic?

I'm working on a project in which I'm trying to reduce the number of conductors in a high-bandwidth, multi-signal communication interface that requires a fiber connection for isolation and a back ...
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0answers
64 views

Methods to ruggedise a USB3.0 type A port

I am developing a carrier board for a autonomous navigation robot. I need to change the USB 3.0 type A ports to ensure a reliable connection in a rough terrain. I am familiar with some methods as: ...
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1answer
41 views

Understanding USB Descriptors speed

I have several USB devices that are capable of running High Speed 2.0 (480 Mbps) mode but runs Full Speed 1.1 (12 Mbps) instead. Take for example a USB DAC: It advertise USB 2.0 compliant and fall ...
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84 views

SPI Slave sometimes sends incorrect data

I apologize in advance if I should have not created a new thread as I ran through new issues after making updates to my project posted on this previous thread: SPI data arrives at every 2nd send and ...
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40 views

PIC16F887 I2C Master-Slave communication problem

I am trying to get 2 PIC16F887's communicate through I2C. I am aware that PIC16F887's are old but they are the only chips I have access to right now. I connected the SCL and SDA lines correctly and ...
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63 views

Connection between 2 STM32F103C8 using I2C

Hello I am new to STM32 and I am trying to learn I2C communication between 2 STM32F103C8 MCUs. MCU1 acts as the master and MCU2 acts as the slave. I am using CubeMX to configure the settings however ...
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SSB and Hilbert transform

I have came across a question where it asks if the input to SSB (LSB) modulator is mh(t) (which is the hilbert transform of m(t)), will the of the modulator be LSB? What I did : I did the math and ...
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1answer
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How do we choose refractive index value in optical fiber design?

It is known that, given two media with refractive indeces \$n_1\$ and \$n_2 < n_1\$, if rays come from medium 1 they will be totally reflected if their angle of incidence is higher than the ...
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SPI data arrives at every 2nd send and in the wrong sequence

I am simulating a project where two STM32s communicate with each other through SPI (HAL drivers), where the SPI Master is an STM32F4 and the SPI Slave is an STM32F3. Basically, the master will send 5 ...
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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
58 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
55 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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120 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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