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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1
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2answers
63 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
votes
0answers
28 views

join between two telephone switches by wireless [on hold]

I have two telephone switches ,each one has a line cables to the houses , but there is no connection between these switches neither wire nor wireless , how can i join between them wirelessly . What ...
0
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0answers
19 views

Q: FCC/EC pre-certification: is it required for evaluation/development kit?

I would like to add a wireless (Sub 1-Ghz or 2.4Ghz-based) connectivity option to an development kit and wondering if FC, EC, and alternative certifications are necessary for this add-ons. As far as ...
-1
votes
0answers
29 views

Wireless voting system project [on hold]

I'm about design and write code for project, which task would be gathering and processing data in wireless voting system. My idea in this moment is something like this: Server - Raspberry Pi with ...
0
votes
1answer
34 views

Transmission of numeric data using atmega 16 and 433MHz transmitter and receiver [on hold]

I've been working on embedded systems for quite some time now and I know that we can transmit signals into a microcontroller using a 433MHz transmittor and the MCU accepts it as if a button was ...
0
votes
0answers
14 views

XBee Pro 900 RPSMA not detecting

I bought 2 XBee Pro 900 RPSMA from Sparkfun.One of them is detected by XCTU but same other one is not detected by XCTU. so I tried recover faultly one by seeing this video ...
2
votes
1answer
21 views

Impact on the battery life of a wireless mouse based on a using practice [closed]

While using a wireless mouse having alkaline batteries, does it matter to the life of batteries, at what distance from my computer I use it? I mean, if I use the wireless mouse from a far distance ...
0
votes
0answers
39 views

What's the purpose of these peninsula-like areas in this smart card circuit?

Here's a scan of a stripped MIFARE Ultralight smart card. Note the underlined peninsula-like areas. They are simply connected from one end to the antenna track. They don't look like a patch antenna ...
3
votes
1answer
51 views

Why is outer turn of this smart card antenna wider than the other turns?

Here's a scan of a stripped MIFARE Ultralight smart card. Most of the wiring is the antenna which effectively consists of a single spiral track. The outer spiral turn clearly is a bit wider than the ...
1
vote
1answer
53 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 ...
-8
votes
0answers
37 views

what is the full name of Rm and Um interface?

Rm and Um are terms in communication system. Um is the interface between MS(mobile station) and base station system. Rm is the interface between MS and TE(terminal equipment). My question is: what ...
-1
votes
0answers
49 views

Not getting the exact output at receiver side that is given at transmitter side

I made a wireless circuit using 434MHz module and HT12E/D.I have given a 50Hz PWM signal with 10% duty cycle.At receiver side I'm getting a different output.But I got the normal signals such as high ...
0
votes
1answer
59 views

Can a Bluetooth wireless connection bridge a USB Host and USB device?

Now that Bluetooth modules are dirt cheap, I'm wondering if I could make a pair of wirelessly connected objects that would act as a "virtual USB cable". One would have a pig tail with a USB Male plug ...
1
vote
1answer
29 views

FSK combined with either ASK or PSK?

Why is it that we are able to combine Amplitude and Phase modulation (Resulting in QAM) but are not able to do so with frequency? Why not combine all three degrees of freedom (Amplitude, Frequency, ...
0
votes
3answers
72 views

Transmit an internet connection over wireless

My target is to transmit an internet connection (8 Mbit/s) over long range wireless RF (7.7 km) with LOS (Line Of Sight). I live in a country where there is no rules for RF transmission, so i can use ...
0
votes
1answer
99 views

Is moving fast will effect WiFi transceiving beavior?

Let's say I'm driving a 2010 Bugatti Veyron 16.4 Super Sport, with speed of 431 km/h = 268 m/h = 119 m/s Now I have a WiFi signal receiver installed on the top of the car and a WiFi transmitter in ...
1
vote
1answer
57 views

Transmit 12v power wirelessly

Is it in any way feasible, in a small form, to power a 12v light with a power source or transition source 3" away without any physical connection? ...
0
votes
1answer
38 views

Choosing a RJ45 to WIFI adapater for use with Embedded Server

I wanted to build the classic web page that turns on and off an L.E.D. My plan was to use one of the Atmega line of micro-controllers with an enc28j60, which seems to be a popular solution to this ...
0
votes
0answers
31 views

Recommendation for proper relay to trigger wired doorbell with wireless intercom

I was just searching my question and found someone on here recently asked this question: I am looking to do exactly the OPPOSITE of this. I would like to use the pushbutton of a wireless ...
0
votes
0answers
26 views

About bluetooth 4.0 modules auto connect

I am new to Bluetooth 4.0 cc2541 modules with pins and baseboard. I am currently working on bluetooth 4.0 modules with the STM32F407VG for the wireless robot controllers which is my final year ...
1
vote
1answer
61 views

Interfacing a GPRS chip (WISMO218) with an RF antenna. Calculating line width for the right impedance

I want to interface the WISMO218 GPRS chip with an antenna. The antenna lines on the PCB board have to be very specific, otherwise the system won't work. I have uploaded the part of the datasheet that ...
0
votes
2answers
70 views

Dipoles lengths underwater vs on land

A submarine (for example) uses a VLF communications system to remain in contact with its headquarters while submerged. The submarine drags a resonant dipole wire antenna behind it in the water. The ...
1
vote
1answer
58 views

Wireless Panic Alarm

I have made a panic button with a simple circuit with a wireless doorbell button connected wirelessly to the chiming box with the output of that connected to a relay powering a 12v flasher and siren, ...
0
votes
0answers
23 views

How do I use the XStream RF module for serial data communication with a BeagleBone Black?

I am currently part of a car team and we needed a minimum 2.5 mile range wireless system which would communicate the sensor values(Battery voltage, current etc.) to the ground station via a radio. ...
1
vote
1answer
281 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
2
votes
3answers
138 views

Wireless Power Transfer at 50Hz

Is is possible to transmit power using magnetic resonance coupling at 50Hz? Assuming I have no constraints on the minimum distance between the primary and the secondary coil. However, the coils are to ...
2
votes
1answer
94 views

Why 802.11g has a maximum throughput of 54mbps?

Can anyone explain why the maximum throughput of the IEEE 802.11g standard has a maximum throughput of 54mbps I can not find that. I would like to know how do you get this 54 taking into account the ...
0
votes
0answers
22 views

Wireless communication LTE question

This question is regarding LTE PHY layer. If anyone is expert at this I would very much appreciate you helping me out. I am having trouble understanding what physical channels and transport channels ...
0
votes
1answer
70 views

FCC certification for nrf24l01+

Is nrf24l01+ from Nordic Semiconductors FCC certified ? It is hard to find out from their datasheet whether FCC approved ? Is it FCC approved ? If it is approved and I use it in my PCB and control it ...
1
vote
0answers
21 views

Compression and communication power consumption trade-offs

Let's say I'd like to save battery power consumption when sending data to remote devices connected wirelessly, i.e., sensor networks. One of the ideas may be compressing the data to reduce the number ...
0
votes
0answers
60 views

Best way to send a simple digital signal wirelessly (close-range)?

I have a small device which powers two vibrating motors. I would like the vibrating motors to be wireless (ie, not actually connected to the device). Here's some more info: Here's the vibrating ...
1
vote
0answers
51 views

Converting USB webcam to wireless

I have a PC workstation and a usb camera installed about 5m away. There is power available at the camera but the USB port is now broken. It is prohibitively expensive to replace as it is installed ...
0
votes
1answer
34 views

wireless sensor baud rate calculation

I need to calculate baud rate of wireless sensor which operates on 433.92Mhz and uses OOK modulation. Signal wave form and packet structure are known. Packet = 36bit (44.7ms), each bit consists of 2 ...
0
votes
0answers
141 views

Is wireless power transfer by induction at 60Hz possible, or does the frequency need to be changed?

I want to build a wireless power transmitter that works over a very short distance. Can I use my line voltage(120V at 60Hz) through the primary coil to induce voltage into a secondary coil about 1/4" ...
1
vote
0answers
182 views

Pic to Pic Communication with 434mhz wireless module?

I want to transmit Data From one Pic18f2550 to Another using a cheap 434mhz wireless module. but its not working at all. Following are the circuits for Tx and Rx respectively. the code for Tx ...
0
votes
0answers
23 views

Switching power supplies, EMI and wireless communication (FSK)

I am writing to gather information about switching power supplies and EMI and its effect on wireless communication. Currently, I am involved in a project and I have to design and realize an FPGA and ...
2
votes
0answers
64 views

Weather Balloon Wireless Mesh Networking

I am trying to get real-time data feed from a homemade weather balloon radiosonde with the objective of sending HD video during the flight; this could be relevant for GoPro-ers who want to send their ...
0
votes
1answer
47 views

Using CP antenna for receiving and LP for transmitting

I've set up two antennas with Linear Polarization (LP) in both sides, in 2.4 GHz no more than 4 meters each other, but they are facing strongly obstruction object (like a big steel wall in they line ...
1
vote
1answer
124 views

What is the simplest possible circuit for a wireless on-off switch [closed]

On one side I have 5V DC powering an LED, and on the other side I have a button (switch/latch/whatever). What's the simplest circuit for this button to control the state of the LED (hopefully without ...
0
votes
0answers
49 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
vote
1answer
81 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
vote
2answers
86 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
votes
1answer
89 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
votes
1answer
80 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. ...
0
votes
1answer
135 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 ...
0
votes
1answer
60 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?
0
votes
0answers
47 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 ...
0
votes
2answers
75 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
47 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
votes
0answers
31 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 ...