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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32 views

Acheiving high data Rate via Xbee communication

We are developing a real time monitoring system for activity detection in Smart Buildings. We are using motion sensors and noise sensors to detect various activities in a Building. We are using Xbee ...
1
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1answer
50 views

How to increase power of a wireless power transmitter circuit?

I designed this circuit for a frequency of 2MHz, but I get an output of 7mW. I need to increase the output power up to at least 10 to 20W. Help me to redesign the circuit. Consider the transformer ...
1
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2answers
73 views

Measuring voltage between two points…wirelessly?

I want to measure voltage between points A and B. Let's assume that there's some obstruction/difficulty in simply attaching cables between those points. Is it possible to measure the voltage ...
0
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1answer
36 views

How to find out Packet Loss in a Broadcasting environment

Indeed packet loss is an important metric to use when comparing different communication protocols. To me it is understandable how one would computer Packet Loss in a unicast transmission. Simply the ...
0
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1answer
38 views

Best MCU platform with over-the-air firmware flashing capability? [closed]

I know spark.io is well known for this feature, but I'm searching for alternatives that offer hassle-free over-the-air firmware patching and has also some open implementation examples available. ...
-1
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0answers
17 views

How to transmit audio wirlessly from a non bluetooth device to a bluetooth phone? [migrated]

I want to transmit audio from a device having an earphone jack to an android phone wirelessly. How to accomplish it over Bluetooth. I looked at ED05 Bluetooth board and A2DP, H2DP profiles but could ...
0
votes
1answer
34 views

How to design mutual inductor in proteus for wireless charging?

While designing the wireless charger, i've designed the circuitry in proteus. And it begins with the use of the dc voltage, then the oscillator and finally the transmitter circuitry and the receiver ...
-1
votes
0answers
11 views

Error expectation for channel estimation

I would like to compute the expectation of MSE error in channel estimation. I am using a pilot-aided channel estimation, however in my case, I am using the signals that pilots and data are already ...
0
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1answer
20 views

concept of segmentation in cellular communication [closed]

I want to get details on the concept of segmentation in cellular communication and how it helps to increase the capacity of system?
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0answers
23 views

Making Shimano Di2 shifting wireless

I am looking to take the Shimano Di2 9070 system and make the shifters wireless. Is this a ridiculous idea or is this something I could make happen? I believe the system operates from the shifters as ...
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2answers
36 views

GSM modules or WiFi?

I'm trying to work on a prototype wearable indoor and I am really confused as to how I am going to transfer data fetched from the GPS device to the server. Is ...
1
vote
2answers
45 views

Expected percentage of collisions for uni-directional wireless transmissions

I am developing battery-powered sensors to measure different parameters inside my house. The measurements are taken by simple AVR controllers (no Arduino) at more or less regular intervals and will ...
0
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0answers
29 views

safely cutting power to ICs and analog subsystems

I'm developing a wireless sensor node, which will be deployed in very remote locations. I'd like to be able to cut power entirely to some power-hungry ICs or subsystems using a power mosfet with low ...
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0answers
10 views

nRF24L01+with arduino and multiple servos [migrated]

I am a copy paste arduino code and schematic user so do any now how to control multiple servos, with nRF24L01+ and arduino I have used the instructabels laser turret project with two servos and it ...
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2answers
53 views

Controlling a simple RC vehicle at long dinstace from a PC

I would like to control a simple, ground-based vehicle wirelessly, at ranges up to 5-6 km. The communication would be bi-directional (to get a feedback of "command received") but would only require ...
1
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2answers
82 views

Trigger wireless door bell by electrical doorbell

I want to use my electric door bell to trigger a wireless door bell. I replaced the transmit button of the wireless transmitter by a relay and connected it parallel to the speaker of the electric ...
2
votes
3answers
178 views

How can I send one bit one mile with one battery?

This summer I will be attending a large music festival for the second year. I will be going with other people this time, and I'd like to be able to communicate with the other people wirelessly in ...
0
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0answers
79 views

Wireless charging through metal

I'm building something at the moment (a vaping mod) and would like to utilize wireless charging, it's approx 1.5mm alloy thick so i need to make some slots/cut some holes but would like to keep these ...
1
vote
1answer
88 views

How to Calculate maximum distance between transmitter and receiver in wireless communication

how to calculate maximum distance between transmitter and receiver in free space radio communication by having transmitted power, antenna gain and noise-to-signal ratio ?
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2answers
67 views

What does blocking performance mean in RF transceivers' datasheet?

I have encountered two terms, adjacent channel selectivity (ACS) and blocking performance (BP), in TI cc1120's datasheet (http://www.ti.com/product/cc1120). I found the definition of the former (ACS) ...
0
votes
1answer
74 views

Why can current phones act as Wi-Fi routers, but not as mobile broadband (3G, 4G etc.) routers? [closed]

Many of today's smartphones enable users to share their own internet connection with others via Wi-Fi through tethering. However, from what I understand, current Wi-Fi has much shorter range and ...
0
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2answers
60 views

Building a vehicle tracking device

I need to build 100 coach tracking devices. I am a web/mobile programmer, not an engineer, so I'm going to be looking at outsourcing for this. To outsource this work however I should know the ...
1
vote
0answers
51 views

Best transmitter and receiver for the job? [closed]

I am very much an amateur when it comes to this just to warn you. I am trying to build a device which will on the press of a button has a transmitter send a 6 digit code to a receiver, which will ...
0
votes
1answer
51 views

FM receiver used to control a switch

I am new to this and I would like to ask for advice on FM receivers. I want to create a very low powered (mass produced) item that has a super bright LED, battery and then related circuitry(for FM). ...
0
votes
1answer
41 views

What is a channel tap?

In wireless communication, I am confused about what people are referring to when they use the term 'channel tap.' Can someone explain the term or provide me a definition? Any help will be ...
2
votes
2answers
53 views

Does bluetooth implement the 802.11 wireless standard?

I've read that the Bluetooth standard is 802.15, but it is implemented with 802.11. Is this true? Do they interfere with eachother? What standard is Bluetooth considered to use?
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votes
0answers
81 views

HC-06 Auto Reset

I have a HC-06 Bluetooth Module connected to an Arduino Micro. I've hit a problem, the Bluetooth module doesn't seem to auto reset, after a device has connected and disconnected from it again! I've ...
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0answers
57 views

in wireless communication why the nodes need to be synchronized

A lot of times I see the authors talk about synchronization. I have seen that "the nodes should be synchronized" so why? I mean we can set all of their timers at the same time? what do happen that ...
4
votes
3answers
275 views

Design of an electronic device to disable remote access ability of contactless payment cards without visible alterations and damage to the card

Question: How could I build an electronic device which disabled the remote interaction functionality of contactless payment cards while not affecting the functions which are accessed via the on-card ...
0
votes
1answer
48 views

Transmitting AV signals one way

I have a video feed that's two AV cables (one sound, one video) and I'm looking to transmit them from the source to about 100-200 meters away. Specifically, I need some sort of transmitter/receiver ...
0
votes
1answer
40 views

standalone Xbee end device / router?

can xbee be used as a standalone device, which can take some input and transfer it to co-ordinator without another microcontroller support? I did find one blog where he used xbee directly programmed ...
0
votes
0answers
29 views

Any parameter other than RSSI in latest wifi standards, which can help estimate distance between wifi AP and endpoint

I have checked and found many references for measuring distance between wifi AP and connected endpoint based on RSSI. But in order to do this, does latest wireless standards produce any parameters ...
1
vote
2answers
47 views

What are the trade-offs of transmission bands?

If I were designing an RF circuit how do I determine what band the circuit should operate on? What are the trade offs? and why is the higher the frequency the lower range? It is quite un-intuitive for ...
5
votes
4answers
1k views

Wireless Home Automation 2.4GHz versus 433MHz [closed]

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 ...
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2answers
63 views

HMI for small desktop laboratory equipment [closed]

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
87 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
34 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
39 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
556 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 ...
3
votes
4answers
89 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 ...
3
votes
3answers
133 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
61 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
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2answers
53 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
41 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
53 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
46 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
71 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
248 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
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0answers
73 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 ...