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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1answer
44 views

Highest achievable datarate for sub-1GHz wireless

According to this datasheet, Semtech LoRa can reach 9375 kbps, while CC1125 from TI has a maximum datarate of only 200 kbps, despite both operating on the same frequency (868/915). To reach its ...
1
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0answers
51 views

Lowest energy wireless protocol for specific wireless sensor node

There are so many options for low-power wireless communication these days. BLE is everywhere, and many other manufacturers try to push their protocols as well. LoRa, Dust, Zigbee, Thread, Sigfox, etc.,...
4
votes
1answer
127 views

Why does smart card antenna follow a “snake” pattern when approaching the chip?

This image is from this post which shows MasterCard plastic card being dissolved in acetone to have the circuitry extracted for further analysis (TL;DR further analysis failed because of chip ...
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2answers
39 views

What could be the reason for failure in using a single-phase full-bridge square wave inverter to drive a coil for wireless charging?

I am working on a wireless charging project that needs a three-phase inverter. I built the inverter (with flexible wiring using connectors) myself and tested it as a single-phase full bridge converter ...
0
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1answer
30 views

Relation between EM frequency/Intensity and voltage/current in a Circuit

Let's say I have a circuit connected to an antenna which listens for a certain frequency range. The antenna would generate an electric current. For an electromagnetic wave we have two main properties- ...
3
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1answer
37 views

CC1120 does not receive upon software upgrade

Note: only read if you have experience using Texas Instruments CC1120 modules earlier. I am using this development board by Texas Instruments with a CC1120 module hooked up on it. I have been using ...
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2answers
30 views

Remote Playback Device [closed]

I am looking for a small device/system that I can pre record a one or two word message on and play it back with the push of a remote button. Ideally, the remote would have 3-5 buttons for different ...
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0answers
43 views

How to convert joules to watts for wireless sensor network?

This model for energy consumption in WSN by Heinzelman has the units joules. I want the result in watts, as far as I know there is time component for converting it to joules. How is that?
0
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1answer
83 views

Sending resistance values over bluetooth [closed]

I am diving into the deep here, as I am only familiar with audio electronics (guitar related). I thought of an educational project for myself to learn. It should be a miniature solution for the ...
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votes
2answers
38 views

Wireless 2.4GHz to Bluetooth? [closed]

I've been wondering about this for a while; I have a Wireless 2.4GHz keyboard that requires a USB reciever to catch the signal. How great would it be though if I could use it on my phone, for ...
0
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2answers
80 views

Can all RX and TX chips be made compatible with each other? [closed]

I have quite a few Radio Controlled Toys, Some I have hacked so that they become autonomous. This gave rise to a question: Can all Receiver (RX) and Transmitter (TX) chip be somehow made compatible ...
0
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1answer
42 views

Wireless control of switches

This is slightly modified diagram of original one for control of DC motor using relays I got in this community. I added flyback diodes and battery for relay coils: My question is, is it possible to ...
0
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0answers
32 views

RF Scheme for fast DAQ (accelerometers)

I am looking to design a data aquisition scheme for a field project where initially 5-10 3-axis accelerometers will be placed on a flexible object to gain information on the amplitude reference forces ...
0
votes
0answers
19 views

Bluetooth pairing on Mac and Windows causes one to dismiss the other [duplicate]

My company is developing a Bluetooth-enabled robotics kit. We have found the following to be true: Pair device to computer A (a Mac) Pair device to computer B (a Windows PC) Computer A is now unable ...
0
votes
1answer
26 views

Actual procedure used to establish a MW link budget in telecom?

If it possible can someone share with me the actual procedure used (Not the theoretical steps in book !) like in Huawei or others telecom vendor to establish a Microwave Link between to sites Like ...
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votes
3answers
82 views

What does the signal from an NFC pulse look like?

When a smartphone comes into close proximity with a passive NFC tag for example, what does the power pulse from the smartphone 'look' like? i.e what is the magnitude of power that is supplied, what is ...
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votes
3answers
87 views

What do I need to transfer data from device A to device B? [closed]

Disclaimer: I have no experience or knowledge at this topic. I ask this only from curiosity. I want to build two devices. Device A should send data to device B. Device B should display the received ...
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votes
4answers
85 views

Power consumption of text, voice, and video packet over a wireless network? [closed]

Does the power per packet vary for different data types such as text, voice and video? If so, does it mean that since text uses lesser number of bytes, it also requires less power to transmit?
0
votes
3answers
64 views

How to increase the distance of wireless power transfer?

I'm trying to make a wireless charger. But I want to make the distance farther. So, How can I increase the distance of wireless power transfer? Does making the frequency higher will increase the ...
3
votes
1answer
49 views

Step-up Voltage for Bluetooth Dongle to Increase Range?

Here's a bit of background to my enquiry: Recently I've had a project that involved me upgrading my laptop as much as possible, to get it to a standard where I'd have to buy a new machine if I wanted ...
0
votes
1answer
42 views

Wireless power within a stainless steel enclosure?

I need to transfer power wirelessly within a small SS tube that is not much larger than the diameters of the Tx and Rx coils. The coils are both inside the tube and are co-axial with it. Coils are ...
0
votes
1answer
34 views

How to evaluate quality of signal?

guys. I'm trying to evalute received signals from a transceiver. I'm a rookie in wireless communication. So I hope that you guys can help me out. I want to make a threshold of received signal so that ...
0
votes
1answer
51 views

Making an LED Transceiver Circuit

I'm building up a project to transmit data from one computer to another computer from a wireless media and I have to use LEDs for this purpose (As per the requirements of the project, so I can't use ...
5
votes
6answers
1k views

Measure temperature on a moving engine valve: transfer voltage and reading wireless?

I am an automotive engineer with very very little or almost zero electrical/electronics experience. I am working on logging real time temperature values on an engine exhaust valve and mounting a ...
0
votes
3answers
187 views

No communication with SIM900A using Arduino Uno

I am using Arduino Uno and trying to connect to a SIM900A GSM module using serial communication. I am not receiving anything from the module at all. The module powers on and has another LED flashing ...
0
votes
1answer
50 views

Does it use less power to process and compress data on a chip, or to transmit it to a station?

Let's say I had a grid of force resistors laid out in a pad. Every 5 minutes I'd apply power to the pad and read the resistance of every force resister. The pad itself would be powered by a battery, ...
0
votes
2answers
57 views

How might this RF double pole switch be constructed and perform?

So I'm aware that there are some high speed RF SPDT switches e.g. Single-Pole Double-Throw (SPDT) switch offering 20nS switching time. I'm interested in a switch like the following picture. This is ...
1
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2answers
57 views

Is the efficiency of (Qi) wireless charging affected by a metal surface?

I recently picked up a Galaxy S7 Edge and love it. I've also gone "all in" on wireless charging, now owning three chargers: a third party standard charger, a third party QC 2.0 (15W) Adaptive Fast ...
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votes
1answer
38 views

Looking for Zigbee and Microcontroller [closed]

Looking for Zigbee and Microcontroller - Selection What series Zigbee wireless should I get? SAM R21 Xplained Pro for MUC to connect some sensor and zigbee. Wireless adapter should be something ...
0
votes
1answer
32 views

Low latency, high channel period wireless protocols

I was wondering if anyone can suggest any low latency high channel period wireless protocols or devices. I have been using the ANT and xbee chips to sample a digital signal however there channel ...
0
votes
2answers
54 views

QI charging over a large area

I am soon building a desk and I thought an interesting feature to have would be for the entire desk to essentially be a giant QI charger for my phone. Obviously, however, this has the problem that ...
4
votes
1answer
156 views

Will FCC EMC tests need to be redone?

In light of the new FCC rules that Chinese (and all non-MRA) labs will no longer recognised in July and all EMC tests need to be done at FCC-authorized Telecommunications Certification Bodies, for FCC ...
1
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2answers
30 views

Scheduling: Is is a Physical layer functionality or a Data(MAC) layer functionality or is it both?

Fellas, When we use the term SCHEDULING in wired/wireless communication, does it relate to a physical layer functionality or a Data (MAC) layer functionality or to both?
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2answers
133 views

Long range, wireless power transmission

What are the difficulties restricting the development of wireless power transmission over long distances? Could wireless power transmission be harmful and/or dangerous?
0
votes
1answer
70 views

Can you use an directional Antenna to sniff packets at a very long distance? [closed]

A normal wifi dongle can be configured in monitor mode to sniff out packets . What determine the range of distance the wifi dongle can sniff out? is it determined by what protocol the wifi dongle is ...
-3
votes
1answer
65 views

receive a video file with a microcontroller [closed]

I want to send a video stream to a microcontroller via wifi. what microcontroller choose for this task? -Must take into account that the video will be transmitted through a phone -The video will be in ...
0
votes
1answer
34 views

possible to you add an external RF PA LNA to a chip that internal ones?

I'm working with a new generation of a wireless chip that now has a built-in PA and LNA. The trouble is that its sensitivity is -92dBm and my old version that did not have internal RF amplifier ...
0
votes
1answer
54 views

using 8 AA or Ni-MH batteries instead of one 12V 23A type battery to power a remote receiver

Sorry for the novice question, but I am thinking there should be a simple solution. I work as a magician and purchased an effect where a snake puppet in a basket goes up and down on a battery powered ...
2
votes
1answer
111 views

How to reverse-engineer a remote control?

I purchased a few bulbs which are manged via a wireless remote control. I would like to use them with my RPi (to which I would add the relevant transmitter-receiver module). Is there a way for a ...
1
vote
1answer
111 views

Ideal wireless channel (coherence time/bandwidth)

Wireless channels can be characterized as either slow or fast fading based on their coherence time and signal length. Similarly, they are either flat fading or frequency selective depending on their ...
1
vote
1answer
43 views

Wifi uplink air interface

Most Wifi 802.11 standards use OFDM to achieve high data rates wirelessly. However, I was told OFDM is not suitable for uplink as it requires expensive and inefficient amplifiers which are not ...
1
vote
3answers
130 views

High accuracy wireless triangulation in a small space?

the question pretty much states the basic idea, but here is my use-case; tabletop war-gaming. Optimally I would like to be able to tag each of my “play pieces” with some sort of tag, place a few ...
0
votes
1answer
35 views

OFDM with CSMA/CA

Most Wifi standards (e.g. 802.11a) use OFDM for orthogonal frequency multiplexing, i.e. assigning different subcarriers/frequencies to different users. On the other hand, it says CSMA/CA is used to ...
1
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2answers
207 views

What are the units in which a radio signal's strength is measured?

I'm kind of confused about which is the most correct unit when it comes to the measure of wireless signal's strength. It seems that the correct unit is V/m (usually expessed in dBuV/m), however it ...
1
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2answers
40 views

OFDM instantaneous power variation

One disadvantage of OFDM is apparantly the high instantaneous power variations (see Wikipedia). What causes this? I assume this is a problem of forming orthogonal waveforms since regular frequency ...
0
votes
1answer
72 views

Build remote wireless Wake-Up with Attiny85

I'm building a ultra-low-power system (mainly composed by an attiny85) that's in sleep state most of the time in order to extend battery life. I was wondering if there was any hack to wake up the ...
1
vote
2answers
424 views

Can I connect many SX1272 (LoRa) based devices to a gateway?

Simple question: Is SX1272 chip by Semtech capable of sending data to LoRa gateways? I'm a little bit confused about LoRa and LoRaWAN. What is the difference?
1
vote
1answer
62 views

How to check female header connection?

I am very inexperienced at electronics, but I have recently tried to connect a wireless chip to my microcontroller. I soldered some header pins to my board to allow me to remove the chip when needed ...
0
votes
3answers
75 views

Integrating wireless transmitter with old door chime system

The building I live in have an old door-chime system, and I wish send a wireless signal when the door-chime is triggered. There are multiple push-buttons at different locations connected to the same ...
0
votes
2answers
46 views

Extending Aerial Range of 360 USB receiver

I have modded an Xbox 360 usb wireless receiver so that it sits inside my PC, but the problem I have appears to be range as it regularly drops the connection to controlers. The connection from the ...