Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

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5
votes
4answers
515 views

Wireless Home Automation 2.4GHz versus 433MHz [on hold]

Project specifications To make some things clear first(wow that sounds so arrogant): This is an Arduino project This is supposed to be internationally applicable I have experience with 433 MHz ...
0
votes
1answer
37 views

HMI for small desktop laboratory equipment

We are building desktop laboratory equipments and wondering whats the next step for HMI from 40x2 Text display and small switches. Idea we are contemplating are... bluetooth in device and android ...
0
votes
4answers
71 views

Will having two antennae at the receiver give better reception?

I have a 300mbps router with two antennae (tp-link td-wd8968). I'm building a PC and looking for a wireless network card. I have seen seen cards with a single antenna (150mbps) and cards with two ...
0
votes
1answer
32 views

Transmitting multiple data streams as one signal to multiple stations

I'm thinking of a system that would take multiple data streams in, encode them into one signal, and then broadcast it out to multiple stations that could then decode the information in the signal for ...
0
votes
1answer
28 views

Low latency rf link

I am working on making a low latency rf link that will be used as part of a feedback loop on a remote sensor. Because it is real-time the delay needs to be as small as possible (if sub milliseconds ...
10
votes
2answers
521 views

How does the plastic-tube inductor in this wireless transmitter work?

This single layer PCB (solder side shown here) is from an old fan remote: The inductor in the plastic tube is not connected physically to any components; however, the two loops of wire surrounding ...
1
vote
3answers
54 views

Determining distance between wireless sensors - sailing project

I'm looking for a solution which will allow me to determine the distance between two points, one of which is static and the other not. It's part of a project I'm working on which will involve the ...
0
votes
0answers
25 views

wireless interference

In this scenario A----B----C----D, all A,B,C and D are wireless nodes, A start to send data to B on channel x and the same time C start to send data to D on channel y which (x!=y). is there collision ...
3
votes
3answers
112 views

Suggestions on instruments to detect pachyderms

I am doing a project to detect the pachyderms in the forests when they cross the borders. Now is there is any other way other than seismic or sound waves to detect the pachyderms before they cross a ...
0
votes
0answers
60 views

Compare EMF Strength

My mother is extremely sensitive to EMFs (Electromagnetic Hypersensitivity), and I want to help her by turning off Wi-Fi in the house and using some Powerline adapters to replace the Wi-Fi network. ...
0
votes
2answers
41 views

Peak-to-peak voltage of WRL-10534?

I'm experimenting with the 434 MHz RF Link transmitter (WRL-10534) from SparkFun. I'd like to determine the peak-to-peak voltage of the RF output, but I don't have access to an oscilloscope that can ...
0
votes
1answer
34 views

Bit error rate objectives

When designing a transmission link, are there any standardized/typical objectives for maximum bit error rate? Apart from some papers speaking about values like \$10^{-10}\$ or \$10^{-12}\$ for optical ...
0
votes
4answers
99 views

Circuit Validity

The following is a circuit I have tried simulating on multisim. The LED on the transmitter part does not light up. The current is 0 through that LED. Is it legitimate?
1
vote
1answer
51 views

Power output needed to go through a car

I need to know the power output needed for transmitter if I want that receiver catch this signal? In details, there is a tunnel 4 by 4 meters and a cars in it, cars have a receiver inside and ...
0
votes
1answer
27 views

Measuring Stride distance wirelessly

I'm trying to fit two sensors in a shoe each (such that each shoe has one sensor). their purpose being to calculate the stride length of a person, as a person takes a stride, the distance between two ...
1
vote
1answer
64 views

40% Channel Utilization on 1Mb Satellite

Using the Slide Window technique, consider a satellite channel with: 500 byte frames sends 270 ms delay on send and receive 1 Mbps rate communication protocol is Sliding-windows Ignore the length ...
1
vote
2answers
88 views

Recreating a missing wireless keyboard dongle with NRF24L01

I have found an old Logitech Wireless Keyboard (specifically, the MK250 model), which was originally sold with a separated "standard" 2.4Ghz receiver dongle (Not 'Unifying', as written here). I assume ...
0
votes
0answers
55 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
1
vote
1answer
47 views

Wireless transmission power for multiple receivers

I have just started learning about wireless systems and for some reason I'm hung up on what I feel is a fundamental idea. Consider some transmitter-receiver pair with isotropic antennas. The receiver ...
2
votes
2answers
73 views

Inductive wireless mobile charger circuit

In wireless mobile charging circuit, is there any formula of spacing which varifies that by increasing diameter and turns, spacing (range) can be increased?
-3
votes
1answer
50 views

ZigBee and Radio Interference [closed]

What are the mechanisms implemented in ZigBee to overcome Radio Interference?
1
vote
1answer
60 views

EM MWD Gap Sub Telemetry Theory Explanation in Drilling Applications

I have been doing an extensive amount of reading on EM (Electromagnetic) Telemetry in MWD (Measurement While Drilling) applications. From my reading, there are a few considerable gaps in my ...
0
votes
0answers
17 views

Variance of background thermal noise wireless communications?

I am new to this forum and hope I can get some help. I have been reading a paper on wireless communications, in this paper a base station with power P=25 is serving a certain user. The user is ...
0
votes
1answer
93 views

Need 3-axis wireless gyroscope/accelerometer.

So I would like to have a sensor that can detect rotation (around the vertical axis only is needed) and that detects motion (no specific direction, only be able to detect if the sensor is moving). I ...
1
vote
2answers
89 views

square wave carrier signal

I am having some trouble to put things together into one picture. Can a modulated carrier wave be a square wave? If yes then How? Because at resonant frequency at the transmitter, the current ...
0
votes
3answers
129 views

How to increase range of zigbee?

I have a Zigbee Pro with Arduino whose range is 2 miles as per specifications. But practically its maximum range is only 200 meters. I am using XCTU software. Is there any setting/configuration in ...
0
votes
0answers
36 views

Receiver effciency when using DFLL instead of PLL

I have a small doubt! How tolerant are industrial standard receiver chip to phase and frequency error. I bring it out because while designing a transmitter, I want to use DFLL instead of PLL to reduce ...
2
votes
1answer
79 views

Receiver understanding FSK bandwidth

I have a small doubt in a one way wireless communication. If I am using a receiver chip to demodulate an FSK signal. How does the receiver understands, which frequency to listen to? For example, I ...
0
votes
0answers
19 views

Does BLE allow same device be GAP observer and GATT slave?

I am making a sensor-actuator system connected via BLE. The sensor is a GAP broadcaster and the actuator is a GAP observer(central device). The actuator perform action based on broadcaster information ...
0
votes
0answers
48 views

programming JN5168

Where can I find documentation for JN5168. I am thinking of buying this module but I didn't find anything which can help in programming though the datasheet of module has almost all features which I ...
1
vote
2answers
97 views

How to start LED wirelessly in a very compact and cheap module?

I have been thinking and researching about this issue for a while with no success. I am hoping someone can solve this problem in the community. I want to have many small modules each with a small ...
0
votes
0answers
38 views

Is possible to get very narrow beamwidth antenna?

Is possible to make 60 dBi sector or patch antenna by make its beam width 0.17°/0.17° only ? how to calculate ideal dimensions against frequency at this range of beam width ?
0
votes
1answer
66 views

Design of 5 - 15 MHz Voltage Preamplifier

I'm trying to design a power amplifier for the HF band to drive an inductive charger. The stage I'm working on now is a voltage preamplifier which needs to be able to amplify 1 Vpp to 10 Vpp. The ...
4
votes
1answer
72 views

ZigBee vs WiFi for wireless communication

I've been working on a product using WiFi. The reason I picked WiFi, is cause I essentially have 20-30 nodes communicating to a main node via a router. This all works very well, and its easy as its ...
0
votes
2answers
117 views

Is possible to build -168 dBm amplifer?

we know that GPS receiver can reach sensitivty of -168dBm, and also it is possible to make receivers with similar sensetitvity can operate at another bands/frequencies . but I just want to know if ...
0
votes
1answer
64 views

Data transmission in ocean

What is the greatest depth where we can communicate with the submarine over the sonar system in ocean? Also, how can we calculate how much data can be transmitted using this method?
2
votes
1answer
54 views

How is CPM Modulation Different from PSK?

Continuous phase modulation has been described to me very similar to wikipedia's definition, which basically indicated that the CPM is different from QPSK, for example, because QPSK abruptly shifts ...
0
votes
0answers
36 views

Packet Loss decreases as the nnumber of nodes increases, isn't it counter-intuitive?

I am reading the results of a research publication about clustering algorithms. The results show that the Packet Loss decreases as the number of the nodes increases. This is a bit counter-intuitive ...
0
votes
0answers
25 views

What are the most important metrics for evaluating the quality of a communication protocol

In a discussion with some Phd students I heard them mentioning Packet Loss Rate, Channel Utilization and Delay are the main metrics to evaluate the quality of a (wireless) communication channel. What ...
0
votes
0answers
73 views

1 Mbps satellite channel with a 270 ms delay

Consider 500 byte frames sends on a satellite channel with a 270 ms delay on send an receive by 1 Mbps rate. by ignore the length of ACK message and using Slide Window technique, how many bits need ...
0
votes
2answers
85 views

How wireless communication works?

When an AC signal is transmitted through a conductor, direction of flow of electrons is continuously alternated. In wireless communication signal is transmitted through air, in this case which ...
0
votes
1answer
127 views

How to make a USB receiver for the wireless mouse? [closed]

I have a Microsoft Wireless mouse but the USB receiver is long lost. Is there anyway I can make the receiver myself?
0
votes
0answers
43 views

Form of the received signal in a MIMO communication

I am reading an article which is related to MIMO communication networks. Consider that there are \$U\$ users, each of them have \$J_{u}, u=1,...U\$, different layers. We want to calculate the received ...
1
vote
1answer
92 views

Making Device to Send Data to Smartphones: 100m range, 1kb/s bandwidth, low power

What I want to make: A device that immediately sends a notification if the device incurs a moment of high acceleration. The notification needs to denote the acceleration. There is no guarantee that ...
0
votes
0answers
45 views

Remotely Toggle Relay

A while back I decided I wanted to get into electronics, after which I bought a number of components to get me started, along with the Raspberry Pi and breadboard I already had. I am now wanting to do ...
0
votes
2answers
255 views

2.4 GHz versus 434 MHz transceiver for home automation

I am working on a project that uses an Arduino Uno R3 and will have one receiver and one transmitter. I'm going to use this for home automation within my home in India. I want to know which ...
0
votes
1answer
34 views

A question about temporal diversity

I am reading a survey. In that survey the author talk about "Temporal diversity" I can guess what is the meaning of that. But he also announce one way of making Temporal diversity is channel ...
0
votes
1answer
50 views

How do multiple users connected to a wireless router receive their signals?

In other words how does a wireless router with multiple users work? I know that routers use electromagnetic waves radio waves, but how does information get sent to the user it is intended to? and if ...
0
votes
0answers
74 views

Accelerometer (or something else) to detect rotary oscillations

I'd like to detect oscillations of a rotating disk. If an heavy weight object is placed in the wrong way on the rotating disk, the rotation it's not anymore only on a straight plane (perpendicular ...
0
votes
0answers
56 views

AT86RF212b connections

I'm trying to communicate at86rf212b with atmega328 , I have connected all SPI connections( MISO, MOSI, SCk, SS), IRQ, SLP_TR and RST with suitable 5v/3.3v conversion (74hc4050) and trying to read ...