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
votes
0answers
16 views

How to connect any sensor to Arduino or Raspberry Pi wirelessly?

I want to connect different sensors wirelessly to Arduino, or Raspberry Pi (preferably Arduino). This is what i am trying to achieve - I want to connect 4 ultrasonic sensors to one arduino ...
-5
votes
2answers
35 views

wireless solution over a long range [on hold]

In an Area of 5 x 5 km (max distance along diagonal is approx. 7 km). Every entity needs to transfer it’s GPS data along with certain programmable data to a central station(say equivalent to a textual ...
0
votes
1answer
69 views

Different Means of Short Distance Wireless Communication

We have been struggling to find a means other than RF communication to wirelessly signal an event between devices placed 60 feet apart and not more than that.The signal can be raised by any of the ...
0
votes
1answer
42 views

Wireless Charging pad that can charge through a Desk

I would like to know if you know any wireless charging pad or a circuit design that can charge through the desk without cutting the bottom of the desk. The maximum range I would like to have between ...
0
votes
1answer
33 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 ...
0
votes
0answers
19 views

How to calculate a RTD of Node in a wsn in NS2? [on hold]

Please help me out regarding it to calculate RTD and if any body can give me the NS2 code for Node failure detection Using RTD??
0
votes
0answers
20 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?
-3
votes
0answers
12 views

SM5172 RF encoder replacement [closed]

I searching the IC SM5172-L3, it's a RF Encoder where it was located in wireless remote control. I can't find it nowhere! Is there some other which can replace it?
0
votes
0answers
20 views

More traffic decreases the signal strength [closed]

Why the higher/more traffic that travels through the Access point, will decrease the signal strength of the access point? is there any invers relationships between them ? what is the theory ?
1
vote
1answer
57 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
60 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 ...
-3
votes
1answer
48 views

How does the bluetooth work for wireless earbuds? [closed]

Wireless earbuds are the new methods of listening to music, but how does the bluetooth work? Does the phone send two separate signals to each earbud? Analog or Digital? How does it work?
-2
votes
2answers
79 views

Converting serial UART from wire to wireless

I have a device with 4 pins (2 pins RX, 2 pins TX), operating at 9,600 Baud. I want to send the data via an HC11 wireless module which has only 1 RX and 1 TX pin. Is this possible? Or can i merge ...
0
votes
2answers
27 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 ...
0
votes
2answers
84 views

How to measure speed without any mechanical or electrical connection?

I would like to build an as-much-portable device for measuring the speed of a vehicle, to check speedometer accuracy and know the offset if one present. The idea is a cigarette pack sized box one can ...
0
votes
1answer
39 views

Wireless data transmission options for streaming video

I am in the initial stages of planning a project that involves the wireless transmission of data between either an Arduino or Raspberry Pi and a base computer/RPi. Data transmitted includes the state ...
0
votes
1answer
59 views

How to determine range of wifi module

I am starting to plan a project that involves either an Arduino or Raspberry Pi (haven't decided yet) connected to a number of sensors. The unit will be located outside, battery powered and will send ...
0
votes
0answers
44 views

How to sense 2khz signal at open end cable

I had a project to sense the signal passed through open end single core cable. The single core cable connected to 2khz signal source. The objective is to detected the signal by attached probe near the ...
0
votes
0answers
45 views

Alternatives for GSM in wireless communication

I am new to wireless communication.The scenario that led to my question is, i had a device in my car and i need to send some data from device to a server. Currently i am relaying on the GSM network ...
0
votes
0answers
22 views

arduino pro mini downlaoding? [migrated]

I purchased the arduino pro mini atmega328 and equipped it with Ftdi breakout board with USB, a battery charging board, Wireless transmitter and a wireless receiver. I'm assuming they can all be ...
0
votes
3answers
60 views

Syncing 50+ wireless sensors

I am creating a set of 50+ remote imu sensors. They will all be in a small distance from one another. Less that 3 meters. Each remote board will have a on board sd card for logging the imu data and a ...
0
votes
2answers
76 views

Increase range of 433MHz remote sensor [closed]

My question is similar to this one but with some differences. I have wireless weather station with 3 remote 433MHz sensors so I cannot change the protocol and program the controllers. Also I'm new to ...
-1
votes
1answer
34 views

Why TMSI is required when we have IMSI?

In several 3gpp documentation pages, it is mentioned that we use TMSI in every sim cards to identify the user in a local network. But my questions is that if we have IMSI, then why they need TMSI for ...
6
votes
3answers
474 views

Short range - low bitrate data transmission under water

I am looking to get a hold of small transmitters for use under water (sea water). They will be rigged to my sensor equipment and attached to fish for scientific monitoring, so size is very important. ...
0
votes
1answer
30 views

Wirelessly connect 5" resistive touch screen to computer

Figured out display, just need to transmit touch signals wirelessly. What I have is a 5" monitor with a USB touch overlay connected to my laptop with a USB cable. I've done quite a bit of research ...
0
votes
1answer
41 views

Can superimposed (combined) wireless signals create a health hazard?

Not to sound all tin-foil-hat-like but I'm learning about wireless signals and am trying to understand it better. So my question is: When multiple wireless signals are transmitted at the same time ...
0
votes
0answers
34 views

How to interface PIC16F887 with NRF24L01+ Wireless Tranceiver in MPLAB XC8

I have got two PIC16F887 and two nRF24L01 Wireless Transceivers, please can anyone give me a link or put me through i how to make them communicate with each other in mplab xc8. All i know is ...
1
vote
0answers
54 views

Computing the received signal

My question may seem a little bit easy but I'm new to these concepts and was hoping if you could help me clarify them by answering my questions. The received signal at the detector writes: $$ y = h x ...
1
vote
1answer
65 views

SX1272 - LoRa - What is the minimal schematic (needed capacitors/resistors) to use that device?

I'm interested in SX1272 by Semtech. It's a LoRa modem. I'm not the best at reading datasheets. Maybe it's because of my poor English. I wonder what is the minimum schematic of such a chip? What ...
0
votes
3answers
105 views

Wireless Communication between microcontroller and PC

I have a FRDM K64f board that is using the nRF24L01+ as it's wireless transceiver. I want to communicate between the K64f board and my PC locally. I am struggling to find the hardware needed on my ...
1
vote
2answers
248 views

Wireless Communication between cellphones

Hypothetically, is it possible to transfer data from 2 devices using a 4g network that's not from their service provider. OR in other words: Could one device download the data from the provider and ...
3
votes
3answers
82 views

How can I wirelessly deliver ~30B of data to ~10 peripherals roughly every 50ms?

I am thinking of a system where 10 or so peripherals need to receive 30-50B of data every 50-ish milliseconds (each peripheral gets unique data). The total throughput required might not be huge ...
3
votes
5answers
127 views

Wireless power transfer through stainless steel

The SS in question is 316, and is only weakly magnetic. Does anyone know whether this is possible?
0
votes
1answer
93 views

What is the best way to connect over 2km distance without line of sight using wireless? [closed]

I need to connect my home internet to the farm. Home has internet connection but farm is in forest area so cannot have internet connection. So I need to setup connection to share my home internet to ...
0
votes
2answers
52 views

Advice on RF component for wireless doorbell

I'm trying to build a custom wireless doorbell, similar to those you can buy everywhere (example). I just need to emit a single signal and receive it elsewhere, to make a buzzer sound. I've already ...
0
votes
1answer
35 views

Locating the Origin of 2.4GHz RF Transmissions

Is it possible? How would it work? Consider IEEE 802.11 (aka.Wi-Fi); for instance. There's such an incredible amount of devices out there, measuring and reporting WLAN AP signal strength (RSSI, RCPI, ...
0
votes
1answer
73 views

Data encoding for GFSK wireless

We are designing a RF link (2GFSK) using the CC1125, to replace and older system. The older system uses NRZI data encoding with bit stuffing. Bit stuffing is used to remove the present of stop flag ...
3
votes
1answer
65 views

Maximum exclusive BLE connections, [closed]

I'm working on a project where it's possible we will have 10+ BLE peripherals trying to send data to the BLE central device. I'm aware that some centrals are only able to support a limited (usually ...
1
vote
2answers
51 views

Radiated power from an antenna

I recently tested a little wireless device in a chamber to get its radiated output power. The DUT sat on a pedestal with a ring of antennas all around it. The antenna is a little pcb slot antenna, ...
1
vote
0answers
45 views

Mechanism of a pringle antenna?

I'd like to DIY a WIFI antenna out of a pringle can. Although there are lots of info online to teach you how to assemble one, but none of them explains the mechanism of it. My questions: 1) What is ...
0
votes
0answers
70 views

3G - Ideal antenna size and amplifying signal?

I am thinking about building my own portable 3G router box. So that I can finally have 3G in badly covered areas and on trains. The idea is simple: [Laptop, Phone, ...] <-> via wifi <-> ...
2
votes
1answer
90 views

Wireless power transmission calculations

I have been able to calculate and fix components for the transmitter circuit of wireless power transmission system but I am still having some challenges. They are: 1. How can I calculate ...
1
vote
2answers
111 views

Wireless power transmission circuit component functions description

I came across this circuit diagram above and I want to implement it but I really need an explanation on the function of the components used in the circuit diagram especially RFC and the diodes (D1 ...
1
vote
1answer
99 views

How can enabled WiFi save battery? [closed]

My Lumia 535 claims, that leaving my WiFi connection turned on can save the battery. How can that be true? I'm a layman, if not ignorant to this area of expertise, but from what I was always told ...
0
votes
0answers
58 views

optical wireless link short range high throughput

I am student and I want to realize a wireless optical link in order to have a throughput of 100Mbps max and the distance between the emitter and the receiver is about few centimeters. I have made my ...
1
vote
1answer
114 views

How to capture, save, and rebroadcast an infrared signal?

I need to capture a signal that is being sent from an emitter (similar to a TV remote). I understand from this question that I can use an infrared receiver to do this.Once this is done, however, I ...
0
votes
1answer
57 views

Beginner level : Bit error rate trend

Please correct me where wrong and I would really appreciate intuitive explanation for the following fundamental questions. These may appear trivial but as I am not from Electrical background, these ...
1
vote
0answers
109 views

What do i need to communicate my sensors with Lora, simply?

I'm new at wifi communications, i need to use Lora at my job project. I searched the internet to learn what the long range rf is. So, if i want to communicate with my sensors(on my mcu kits) over long ...
0
votes
1answer
38 views

Need wireless communication technology options when long range is necessary [closed]

I need to find a way for my cell phone app to "ping" a device (that doesn't have a service plan, etc.) and make it vibrate when pinged. Range needs to be at least 1km reliably. Also the device needs ...
1
vote
1answer
48 views

Ionic Reflection [duplicate]

I finally went and got my Ham Radio licence. I've been reading about how radio operators use the ionosphere for long distance communication through ionic reflections of transmitted/received EM waves. ...