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

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0
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0answers
34 views

Serial communication using Arduino and TeraTerm [migrated]

I wrote a simple serial program using Arduino Mega 2560, it is connected to COMPORT 10. Here is the program I Wrote, ...
0
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2answers
32 views

Equalization of Square Pulse in Visible Light Communication

I am currently working on a VLC project to build a VLC receiver. I attached a schematic of the circuit I have designed. The circuit on the left is the transmitter sending a square signal at 1 MHz ...
3
votes
1answer
55 views

Multiple-terminal notification system to make calls between rooms

TL,DR: How to implement notification system with multiple terminal devices, which allows to make call from any terminal to any other terminal? Main constraints are not using programmable chips/MCUs ...
0
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0answers
21 views

Aerostatic balloon transmission system

I'm not sure this is the right place to ask my question, if not please tell me and I'll move the question. I'm planning to build a little aerostatic balloon, and at the moment I was wondering about ...
0
votes
1answer
47 views

What is the technology that transmits voice in 3G networks?

Sorry for having naive questions and using improper terminologies. I heard that 2G networks are said to transmit voice only, while 3G both voice and data, and 4G data only. When the 3G coverage ...
-1
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0answers
20 views

Equalization & Ringing for Square Wave Signal using VLC

I am currently working on a VLC project to build a VLC receiver. I attached a schematic of the circuit I have designed. The circuit on the left is the transmitter sending a square signal at 1 MHz ...
0
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3answers
48 views

Compression schemes sending difference between successive samples only, what would happen if error occurs?

There are multiple inginious data compression methods in which we send the difference between current and next sample rather than the actual value of the sample. This makes it possible to send the ...
0
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0answers
9 views

What's the intuition behind `rate maximization` of users in cognitive radio network?

There are many research paper in communication area regarding cognitive radio secondary users. One of these is to maximize the rate of the secondary users. But my question is whats the intuition ...
6
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6answers
404 views

Serial protocol delimiting/synchronization techniques

As asynchronous serial communication is widely spread among electronic devices even nowadays, I believe many of us have encountered such a question from time to time. Consider an electronic device ...
-1
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1answer
55 views

carrier in carrier [closed]

I am working on Comtech modem 625 there is an option carrier in carrier that mean we can transmit and receive the signal at a same time. I want to know this logic how can we communicate by using ...
0
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0answers
36 views

Connection between two chips with different data clock [on hold]

It is my first question in this site. I'm planning to make CCD board camera. But there are some difficulty in making schematics. I will use the sharp dsp digital output that type is ITU-R BT.656. ...
1
vote
0answers
16 views

Difference between DQPSK ideal and actual?

I had a question regarding some testing that I was doing. When simulating a differential QPSK system and running it, I was finding that my bit error rate was higher in the simulation, than the ...
0
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2answers
49 views

Identification Technique

I'm building a 20cm x 20cm table that is divided into cells, it has 4 rows and 4 columns. There will be different external blocks that have numbers, each block can stand on a single cell, each block ...
-1
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0answers
6 views

How to communicate with two PC using RS232 [migrated]

I was just wondering that is this possible to communicate with two computers using RS232 using softwares like docklight and putty. Suppose if i send Hi from on pc will it recive in another PC and ...
0
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0answers
54 views

Sending data from an arduino after disconnecting the serial port

If I disconnect my arduino uno from my computer to measure an accelerometers data, how can I send the data from the arduino to my computer? Can I do it by reconnecting the serial port or can I only do ...
0
votes
1answer
31 views

Project Loon 20KM LTE transmission from Regular Handset

i read this question before asking. how does a cell phone transmitter work? i am very confused about Google Project Loon. I understand the balloons will be transmitting LTE from 20KM up in the ...
0
votes
1answer
17 views

Can FTDI Basic Breakout and FTDI XBee Explorer USB be used alternatively?

I wonder if these two boards from sparkfun can be used alternatively for USB to Serial communication? The first: (FTDI Basic Breakout) https://www.sparkfun.com/products/9716 The second: (FTDI XBee ...
0
votes
2answers
39 views

Best Hardware for Accurate Point Tracking System

Here is what I am trying to accomplish: In the middle of a room, I have a mechanism with a laser diode mounted on it that can be moved in all axis by a motorized pan/tilt head type device. This ...
0
votes
1answer
20 views

Calculating the Power of the Upper Sideband

I solved a question in a book that goes like this: If the carrier power is 1000 watts, what is the power in the USB at 70.7% modulation? I solved it using the formula: $$ P_{USB}=\frac{m^{2} ...
0
votes
1answer
30 views

During boot-up, address of UART(0x8a000) is being used. With MMU turned off during that time how is this address being used.?

How is any peripheral address we use in our programming being used by kernel in actuality? Kernel with its MMU component, how does it work on the peripheral address.
6
votes
2answers
312 views

Wireless communication under water

I am looking for a under water wireless communication, distance up to 3000 meters. For this I quickly did some research on it and found out that Acoustic communication would be the best solution since ...
2
votes
2answers
82 views

RX/TX labeling standard

I'm familiar with the idea that RX means receive, and TX means transmit. Therefore, if I'm wiring two IC's together, feeding the TX of the sending chip into the RX of the receiving chip makes sense. ...
3
votes
2answers
127 views

How Channelization code is shared in HSDPA?

I am on my way to understand the HSDPA/HSUPA technologies. I have just started and came upon the topic of channelization code. I learned how these codes are generated - Hadamard code technique - and ...
0
votes
2answers
59 views

How to use a MUX DEMUX to communicate two circuits?

I'm trying to reduce two circuits with 14 connections to only 3. I was googling for hours and I read a lot about multiplexor and demultiplexor. But as is my first investigation in electronics (I'm a ...
0
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0answers
58 views

Receiving sensor data with Arduino: push or pull?

Every second I am reading a data string (comma-separated) from a battery management system via RS232. The first step was stripping the field name from the value; at times resulting in skipping a ...
0
votes
1answer
47 views

ANT-MMCX and Microstripe line and UHF RFID module circuit designing

Below, you see the only schematic of a 6 pages-datasheet of an UHF RFID module (working frequency = 840...930 MHz): There are three questions: What is that ANT-MMCX? I search it in Google and I ...
1
vote
3answers
114 views

12V signal convert to 5V without interfere

I have Wiegand 26bit bus. DATA0 - GND = ~12.5V when idle DATA1 - GND = ~12.5V when idle I need some sort of scheme or something to convert 12V signal to 5V without interfere. I have few ...
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2answers
63 views
0
votes
1answer
184 views

MISO/MOSI vs DI/DO

Is there a difference between the MISO/MOSI pins and the DI/DO pins? Is it true that MISO/MOSI is for SPI communication where DI/DO is for USI communication? What is the difference exactly?
1
vote
2answers
74 views

I want to send and receive data wirelessly from 90 different areas to a central collection site. longest distance is 8.5 miles.

I have 90 pump/lift stations that I would like to send information from to a central collection place (office). The longest distance is 8.5 miles away. most of these pump stations are line of sight ...
1
vote
1answer
76 views

Detection of the 3G network

Is it possible to detect a 3G mobile network without having the orthogonal code or the spreading code used in 3G? By detect I mean pick up the radiated radio frequency from the mobile phone then see ...
1
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1answer
43 views

what is the function of pre-emphasizer and dee-emphasizer in Stereophonic FM Receiver?

what is the purpose of theses two block ? I know that pre-emphasizer will boost the high frequencies before transmission and dee-emphasizer will reducing them by a corresponding amount in the ...
1
vote
1answer
63 views

Reliable way to transport data over 1-2 km distance

I am looking for some way to transport data (around 3000Kbps) omnidirectional. Transmitter should not weight more than 300 grams but receiver can be much heavier. The range I am trying to achieve is ...
0
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2answers
54 views

How PCIe can tranmit data at 2.5 GTps?

Serial transceiver for PCIe is using Reference clock of 100MHz. Then how data transfer at the rate of 2.5 GTs is possible?
2
votes
1answer
66 views

Working of ring modulator

I am having trouble understanding how this ring modulator works i.e. how it multiplies the input & carrier to give us appropriate output? Any help or guide will bedeeply appreciated. Reference - ...
2
votes
1answer
68 views

Why does using Discrete Cosine Transform lead to data compression?

DCT is used in JPEG standard along with Huffman encoding to further compress the result. I understand that most of the data in spatial domain which is an image is "present in low frequencies". This is ...
0
votes
1answer
71 views

Sync pulse from PC

Can anyone suggest a way that I can send or detect short pulses between a microcontroller and an old laptop with limited I/O functionality. I need to do this every 5-10 sec. The laptop doesn't have ...
0
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0answers
22 views

duobinary coding : how to find if there an Error in a given sequence?

why we can't have even number of zero between opposite polarity ? is the same things applies for even number of ones between opposite polarity
1
vote
5answers
427 views

Low cost simple communication between two microcontrollers

What tradeoffs and connection options are there in low cost bidirectional communication between just two microcontrollers? In this case: Master/Slave relationship, bidirectional data flow Distance ...
0
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0answers
38 views

Data Transmission Including Lasers + Shift Registers

In a project we're doing we need to be able to transmit data through lasers. Data is just 4 bit binary numbers. So what we intend to do is have 4 Parallel in - Serial Out Shift Registers connected to ...
0
votes
2answers
75 views

AtTiny45 read lag?

I have set up 2 AtTiny45 setup like this (The left one is also connected to power): from which one (the left one) is generating a signal which is (when measured) looking like this: The second one ...
0
votes
3answers
411 views

How to send string in serial communication in AVR-C

So as the title states, instead of sending a byte of information at a time, I would like to be able to send a whole string. What I tried to do was that I tried to put the user input in an array and ...
0
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0answers
50 views

USB signal analysis

I have a device that I want to control it has window software that runs it, and a complex interface. I just need a pair of commands, also I know very little about usb device hacking, and signal ...
2
votes
1answer
161 views

Can two PCIe endpoints communicate with each other through PCIe switch?

Figure shows basic architecture of PCIe. From what I understood, Root complex block will convert data into PCIe format. That means PCIe endpoint to endpoint communication will happens through Root ...
0
votes
1answer
125 views

One wire (+GND) serial communication. How to have a correct coupling?

I'm a firmware developer more than a hardware designer. I've a doubt about an idea of mine. I want to obtain serial communication between eight ATtiny85 (slaves) and an ATmega168 (master - It might ...
0
votes
2answers
163 views

RS-485 Modbus device to MCU

I have a device (an energy meter) that sends data via RS-485 (Modbus protocol). And I want to collect it with MCU. The important thing is that I'm trying to design a board and I want it to be ...
2
votes
2answers
131 views

Serial data received in wrong bits

I have an RS422 interface set up between an Arduino and a custom-built device. The device is set to transmit a 16-bit header, followed by 66 bytes of data, at a baudrate of 460,800 and at 200Hz. This ...
0
votes
1answer
89 views

Atmega328P FTDI 5V USB Serial Communication

I am working a Atmega328P and FTDI 5V USB Cable to get a Serial Communication between the Micro-controller and the PC. I am using Tera Term for receiving out from Micro-controller. I am using an ...
0
votes
2answers
81 views

Bidirectional connection between a device and a webserver

I'm a software developer, I'm in no way familiar with electronic devices but I'm working with people who are familiar with them. Our problem is: We need to design a small device able to communicate ...
1
vote
1answer
86 views

Make two Arduinos communicate with electrical signals

So I need to make two Arduinos communicate. Though, I can't use any clock related system (so no Serial, no I2C...) and so my idea was basically to wire one from another so they could read electrical ...