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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13 views

Wireless interference due to SSID broadcasting

I'm not connected to the 2,4 GHz network, only to the 5GHz. But the 2,4 GHz network cannot be turned off(apple airport) so although not being used it keeps broadcasting it's SSID. I'd like to know how ...
0
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1answer
72 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 ...
-2
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0answers
37 views

Wireless synchronization [on hold]

I want to build sensor network and I am looking for a wireless IC. Sensor: mostly accelerometers , gyroscopes , analog voltage reader (24bit ADC) Frequency of sampling mostly 400Hz and more I am ...
1
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1answer
51 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
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1answer
23 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 ...
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0answers
15 views

2.4GHz RFM73 module talking to Wifi Router [on hold]

Ive been working on these cheap RFM73 GFSK transceiver operating in the world wide ISM frequency band at 2400-2483.5 MHz.Ive successfully tested them on PIC18F46K22.They work well within the range of ...
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0answers
21 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 ...
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0answers
15 views

HC-12 Wireless Serial Port Communication Module [closed]

I have been trying to make a robot that will go as per instruction from MATLAB using HC-12 Wireless Serial Port Communication Module and send me back video stream and using the video i will send ...
0
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0answers
19 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
48 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
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1answer
49 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
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0answers
14 views

can I use same zigbee shield to arduino for 2.4GHz and 900MHz XBEE? [migrated]

I have Xbee shield tested on arduino Uno by 2.4GHz Xbee by Digi Internationals.Now I want to buy 900Mhz Xbee.Does there any change in shield or in program. There is note on Sparkfun about "XBee ...
1
vote
1answer
51 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
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0answers
14 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
264 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
111 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
82 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
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0answers
20 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
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1answer
43 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
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0answers
19 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
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0answers
50 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
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0answers
39 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
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0answers
16 views

Sending Commands to the SSC-32 via a WiFi module from Arduino

Hello there everyone can someone help me on tip of how to go about using a wifi module like the nrf24l01 with the SSC-32 ? i want this SSC to be a Slave while the Arduino wud be the Master, i have ...
0
votes
1answer
27 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
129 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
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0answers
125 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 ...
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0answers
20 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
52 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
42 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
107 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
41 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
73 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
80 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
84 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
67 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
89 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
42 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
36 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
68 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
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 ...
0
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2answers
55 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
vote
2answers
139 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
183 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
85 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
162 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 ?
0
votes
2answers
100 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
79 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
65 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
53 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 ...