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Questions tagged [communication]

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

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1answer
147 views

carrier suppression in dBc for a particular DSB-SC signal

A sine wave is applied to a balanced modulator. The peak output envelope power is \$ 1000 \$ times the minimum output envelope power. Then the carrier suppression in dBc will be ______? My thoughts:...
1
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1answer
184 views

What kind of communication protocol is this?

I'm trying to reverse engineer the communication between two modules, a master and a slave, but I couldn't figure out the used protocol. All of the signs use 5V. The blue sign's frequency is 400 kHz. ...
3
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1answer
105 views

What is the Load referred to RS-485?

This is my first time knowing what rs-485 is and I am computing the power consumption between only two (2) rs-485 transceivers SN65C1167. As I read the datasheet, i became confused on the term "load" ...
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2answers
690 views

Using circular buffer over UART

I am setting up an UART protocol that allows the communication between 2 boards; A Master board and a Slave board. The communication between them is going to be like this: Example 1 : Master [Tx] -- ...
0
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1answer
35 views

Communication Technique used in Commercial Vehicle Tracking Systems

I am working on a vehicle tracking system that conveys the coordinates information from the vehicle to a server via GPRS communication. For this purpose I am using a GSM module with an arduino uno. As ...
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1answer
318 views

Feedback on daisy chained SPI Sensors

i just wanted to verify if my insights are correct regarding the title/issue of this question. I don't have any hardware for me to see the output so i'm trying to visualize it via math and though ...
1
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2answers
221 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 ...
0
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0answers
106 views

How do I connect a microcontroller to the cellular internet network wirelessly?

I am working on a project where I have to wirelessly turn on and off Electric motor pump, which is at a distance of approximately 500 meter from my home. I need help to select the wireless ...
1
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1answer
56 views

Number of point to point link

I dont know if this is unrelevant here but i wish if someone could help me . The number of point to point links required in a fully connected network for 50 entities is (a) 1250 (b) 1225 (...
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2answers
202 views

ATmega communication with I2C + extender or with ENC28J60 ethernet module?

I want to communicate between ATmega328P µC's over 'long distance'. The ATmega µC's will be 5m to 20m apart and the total length of the chain will be around 50m with up to 10 ATmega's in one chain. ...
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2answers
192 views

Sending audio data in chunks using visible light communication

I am currently working on a visible light communication project. I have seen similar projects made by other people, for example: https://www.youtube.com/watch?v=iUR-IB1mS1g https://www.youtube.com/...
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1answer
47 views

TI CC2545 supports how many Channels for 1Mbps and 2Mbps Data Rate

According to TI CC2545 User Guide Page 236, Section:23.5 Frequency and Channel Programming: " For normal transmit and receive tasks, the carrier frequency is set by using the register PRF_CHAN.FREQ. ...
0
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1answer
126 views

ETSI[Europe] Regulations for 2.4Ghz ISM Bandwidth Limit and RF Power

I am trying to interface my STM32 with NRF24[2.4 Ghz ] or TI CC2500[2.4 Ghz] models. I am finding issue regarding maximum allowable Bandwidth and RF power set by ETSI[Europe] EN 300 328 and EN 300 440(...
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1answer
101 views

Identify Single wire communications protocol [closed]

Hi guys I I have uploaded pictures from an oscilloscope. This is the signal that an indoor AC unit sends to the outdoor unit. It uses a single wire for communication and Seeing the PCB it looks like ...
2
votes
1answer
642 views

Generate hamming code-words with given minimum distance

My understanding of hamming code (adding this as it might help someone in future): Description: Hamming code is basically an extended parity check code. Message is divided into blocks, and multiple ...
1
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1answer
515 views

What is problem with NRZ and how manchester line coding handles out of sync tx and rx clocks.?

I am reading about physical layer of the OSI model. Specifically the different ways in which digital bits can be represented as voltage levels, among the multiple types are: NRZ. Manchester encoding. ...
2
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3answers
218 views

IC voltages and low power design, What todo?

I’m working on a low energy device consisting of a couple of IC’s. What is confusing to me is the following, All ICs has a vcc supply range of 1.7 to 3.6V and most of the time the current reading is ...
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1answer
138 views

VLC - OFDM with RPI3 [closed]

Edited, We want to transfer data in high speed's. we are using RPI3 for all the mathematics calculation. As we know the RPI dose not support ADC with high sample rate so it irrelevant for us. We ...
21
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6answers
2k views

What drives the advancement towards ever faster cellular network speeds? [closed]

I've always accepted that technology advances. Being born in the 90s, everything just becomes faster, smaller, cheaper and generally better if you wait a few years. This was most obvious with consumer ...
0
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0answers
53 views

Detecting ultrasonic by microphone and MCU

I design data-over-audio transmission to MCU. To do it i need ultrasonic detector with specific frequency, for example 50kHz. Seems, that electret microphone+low-pass filter+envelope detector will ...
0
votes
1answer
68 views

Suitable 12VDC Communication protocol for untwisted unshielded long-ish wire length?

What would be a reliable and simple tranceiver interface/protocol for board to board serial communication at about 100ft. [9600bps or lower is fine.] The two-lead communication wiring cannot be ...
0
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0answers
123 views

Low cost low speed fiber optic connection for embedded applications

I would like to use a fiber connection to send data between two nodes. The nodes would typically have a 8 or 32 bit micro controller. I need data rate of 2 Mbps or higher and distance is about 100 ...
0
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2answers
140 views

How to transfer data via UART that is read form another module using SPO at a faster rate?

I'm using a VS1053,to do a PCM recording for 1 minute by using STM32l4 microcontroller. The data is read from the VS1053 at 16 MHz, the sampling rate is 8000 sps and each sample is 2 bytes, which ...
1
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1answer
392 views

How do I implement a communications interface to an Altera FPGA?

I have a DE1-SoC with some data coming in through an A-D Card. After digital processing I want to transmit data to a host PC for records. I'm trying to figure out the easiest way to go about this. I'...
2
votes
2answers
211 views

What is the RS-485 line wire series resistance limitations?

Just tried to simulate the communication line with the series resistance in it: As you can see even at 1 MBPS the signal at the "receiver" is fairly good. I'm pretty sure that this will be OK to ...
7
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1answer
867 views

Capacitors in MAX 232

Out of curiosity, can I replace the electrolytic capacitors in the circuit with non-polar ceramic capacitors? Will I get the shifting in level? MAX232 datasheet: LINK
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2answers
130 views

Decay rate of Filter and how it relates to transmission speed

I had a question with regards to the decay rate of filters and how it responds to transmission speed. Suppose we have implemented a simple BFSK system with two asynchronous receivers and we have a ...
2
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4answers
596 views

Implementation of Analog Matched Filter

I have been reading about communication theory and I was wondering if matched filters can be implemented with analog parts and what they would look like? If they can't be it seems like the matched ...
-3
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1answer
2k views

Multiple CAN bus devices broadcasting at the same time…possible conflict?

I've worked with CAN bus recently and started to wonder what would happen if multiple devices on a network suddenly happen to broadcast at the same time. I mean every device on the CAN-bus network ...
0
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3answers
436 views

Challenges of Power Line communication

I am looking into Power Line communication (PLC) as a means for smart metering. It looks totally possible to send the data from the meter to the source of the power supply or the transformer. Most of ...
1
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1answer
134 views

How to interpret this CAN bus data and find an equation?

I am trying to reverse engineer the data sent from an old CAN bus data logger. It sends a single ID which is selectable from a dip switch. The only bit of data I am struggling with is the RPM I plan ...
0
votes
1answer
483 views

Interfacing three UART devices to Microcontroller without loss of data

I have a microcontroller TM4C123GXL Launchpad, that has 8 serial UART ports. I am using Keil uVision5 with Tiva Ware for programming. I wanted to interface 3 UART devices with the microcontroller ...
0
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1answer
63 views

way to display the data from a multi function meter [closed]

I have a multi function meter and i want to collect the data and display it. My idea was to create a api for serial communication?? will the idea work or is there any other better way?? the meter uses ...
0
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1answer
89 views

Improving signal communication over distance

Knowing that Wi-Fi on 2.4 GHz has a good signal strength when there are 50 m between the access point and the unit that transmits the data. I want to transmit this data over a distance of 1.5 ...
0
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2answers
358 views

How does a CDMA Rake Receiver work?

If we dont know the channel coefficients but assume that we are sending a bunch of training symbols how does the receiver estimate the channel coefficients and how often should we estimate these ...
1
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2answers
867 views

high speed microcontroller - pc communication

I have a project where I have to sample a 4 bit bus every 100ns continuously for a data logging application (I need very low sampling jitter as well). I have a uC that can go up to 300MHz so speed isn'...
0
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1answer
190 views

Relate phase velocity and velocity factor (transmission medium)

I want to derive the velocity factor \$v_f\$ $$ v_f=\frac{1}{c\sqrt{L'C'}}\tag 1 $$ and this relationship with the phase velocity \$v_p\$ $$ v_f=\frac{v_p}{c}. \tag 2 $$ \$L'\$ is the inductance per ...
1
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2answers
80 views

Why we don't use pull down resistors for implementing I2C protocol ? And why resistance value varies in I2C depending on its speed?

I have read that we have to pull-up the SDA and SCK lines because the lines are open drain/open collector. But I don't understand why can't we use pull-down? Secondly why the value of resistance ...
0
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1answer
889 views

Differences max485 and max13487

In my application, I need to transmit data between two arduinos, one as a master and the other as a slave using 485. The arduinos are connected to these modules, which have a Max485: Schematic: With ...
1
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1answer
726 views

How to use Esp8266 to communicate between Arduino and Raspberry Pi? [closed]

I need to read 8 sensor values from Arduino and send it to Pi through Esp8266. Also after reading these data my pi will give back 6 other values (integers) which has to be received by Arduino again ...
0
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0answers
58 views

How to determine best wireless technology for my application

I'm trying to help a buddy research implementing some form of wireless communication between a dozen or so self-contained sensors to collect data placed outside around a small area (less than 20ft ...
0
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3answers
113 views

Why does the frequency response H(f) exhibit conjugate symmetry in case of a linear system with real impulse response?

The frequency response H(f) is a complex quantity. So, it can be expressed as: $$H(f)=|H(f)|exp[j \beta (f)]$$ Why in case of linear system, having a real valued impulse response h(t), does the ...
0
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1answer
48 views

Problem making an OOK current signal using pvcvs

I am trying to make an OOK current signal using pvcvs in cadence (I tried pcccs but i couldn't find out what the settings were and it didn't work), and in order to change the output to current i used ...
3
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4answers
3k views

How to transmit data over a long distance at a affordable price

Please do keep in mind that I have no background in electronic communication. The idea is to receive data from electronics at long distances. The distance I will be looking at to read data from ...
0
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1answer
64 views

When supply fan VFD starts up it causes communication problems for my energy management controller

We have an energy management system that controls the air handlers for a building. I have one unit that when the supply fan VFD starts up it cause the unit controller to start having communication ...
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1answer
63 views

What is the name of the syntax standard Keithley is using for remote control over serial?

Keithey (and other manufacturers) have a standard syntax for communicating over serial. Typically, commands look like (source): ...
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2answers
432 views

Propagation comparison between 868 MHz, 915 MHz and 2.4 GHz

I am looking for literature for Comparison between 868 MHz, 915 MHz and 2.4 GHz wireless communication system. For example under what condition I should use 868 MHz or when I should not use 868 MHz. ...
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1answer
54 views

How to send data from simple digital device to an Android application wirelessly?

I am trying to find a way to send measurements from a digital device (as the blood pressure device) to a mobile application that can analyse these data ..... How to send these measurements wireless ...
0
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1answer
219 views

Have mechanical butler's bell, would like to ring it with push button

I have been recommended to post here! Basically I have a butler bell which I'd like to ring from a few floors away with the use of a push button. I have arduinos, ethermegas, spark/particle core, but ...
0
votes
1answer
2k views

Which RJ45 pins should I use for power supply?

I'm somewhere in a process of creating mini automation system for hobby use. I've already put CAT 5e cables with RJ-45 connectors in walls. They are somewhere between 5 - 30 meters long. On one side ...