Questions tagged [wireless]

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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29 views

Selective wireless power transfer

It is possibile to power on a single led (in a led panel) using wireless powering? I know the possibility to transfer power by wireless, but, is there a way to transfer power with high precision (1mm) ...
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3answers
93 views

Send 200 Hz signal over 200 meters in realtime

I have a RC car with a G-Force sensor. The data is converted to an audio signal with frequencies between 0 and 200 Hz. I would need to send this audio to me. The requirements for this are: low ...
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50 views

Time Synchronization between stations over WIFI 802.11n

I'm working on a wireless (2.4Ghz WiFi 11n) project where multiple nodes (ESP32) send very small data to the AP, something like 40 bytes every minute or so. I need to maintain an accurate coordinated ...
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2answers
56 views

Antenna separation in a beamforming array [closed]

Why does the antenna separation in an array need to be lambda/2 and what happens if it is smaller or larger than that?
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52 views

Video transmission wirelessly [closed]

I need to transmit a video file wirelessly. Its size will be 3Mb maximum. Resolution depends on the video and i can change the fps value as i wish. The video file will be given in a SD card or a ...
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48 views

1 km point to point low latency wireless link [closed]

I have an application where I want to control a motor 1Km away with a remote control. The motor will be moving on a carriage, the remote control will be hand held. Can anyone suggest the best digital ...
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1answer
41 views

Which LTE band should I use?

Background I am designing a basic IIoT device. When the sensor detects the parameter of interest, it transmits a message using an LTE modem. The modem is capable of Cat-M1 and NB-IoT, and I want to ...
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40 views

Designing a wireless network of sensors

I'm designing a network of wireless sensors for an outdoor enviroment. It will consist of aprox. 30 sensors powered by battery (6 months autonomy), taking measurements with a low frequncy (max 10 ...
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1answer
29 views

Individual Digital Control Of LED Array

I am working to create a portable educational element display (about 2 meters wide) along the lines of this one at Griffith Observatory: http://www.griffithobservatory.org/exhibits/...
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36 views

nRF24L01+ radio module - IRQ problem

I have a problem with IRQ interrupts. After successful transmission, the nRF24L01+ sets the IRQ pin low (about 19 ms), but sometimes doesn't return to high: After every packet transmission (tx ...
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1answer
112 views

Can mobile reception 4G/5G signal reception be affected by atmospheric changes?

For example, if it rains or there is smog in the air can this atmospheric change affect the signal quality of mobile phone devices such as 4G and 5G? I have been noticing changes in the reception ...
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1answer
84 views

Wireless power transfer choosing of mosfets

I'm an ee student and for the group project we have chosen to make a Wireless power transfer. Our goal is to charge a laptop. As for the result we have to demonstrate charging a laptop, so considering ...
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47 views

HC12 Serial RF Transceiver with PIC16F886 Microcontroller

I'm trying to do a wireless communication between two PIC microcontrollers (PIC16F886) using the TX/RX lines using HC-12 RF transceiver modules (datasheet link below). https://statics3.seeedstudio....
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2answers
68 views

Why can't we operate at high frequencies (>0.5GHz) when having a resonant inductive coupling circuit?

I am currently trying to figure out if a high frequency (GHz) resonant inductive coupling circuit would be feasible and efficient when wirelessly transferring power. Through many research papers, ...
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4answers
117 views

Home automation: why is wireless more popular than data over power line? [closed]

This is a question for discussion... I have recently started looking in to home automation and "smart devices" and see a clear tendency for everything to run on WiFi, with some exceptions of bluetooth,...
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44 views

Wireless Audio Transmission with NRF24L01

:) I have been planning to do a project on transmitting audio through arduino using NRF24L01 RF Modules at the same time sending data commands. I am really a beginner in terms of audio circuits so I ...
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38 views

isolation transformer in outdoor case (telecomm)

I need to build an outdoor cabinet to feed my wireless components. I have frequent atmosferic discharges and I thought to install an isolation transformer to reduce spikes from 220volt ac source. ...
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9answers
10k views

Why is wired Ethernet losing its speed advantage over wireless?

This has been bugging me for a while now. I did a couple wireless transmission courses back in my university days and it's a know fact, wireless transmission is hard. Partly because it's a shared ...
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1answer
61 views

Transparent Screen Selection

We are as a team with four members intending to design an augmented reality oriented smart glass which shall contain a CMOS camera, wireless communication and transparent screen. The algorithm below ...
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1answer
69 views

How to recreate square waves over wireless in 'real time'

I currently work with a product that is designed to capture data from three simple digital sensors and perform some calculations based on the outputs. The sensors produce square waves (with different ...
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2answers
32 views

Li-po cell in RF remote

I am working on a zigbee wireless remote. MCU datasheet says it operates in wide voltage range of 1.8 to 3.8 volts. Besides zigbee MCU, there will be a few LEDs and tact switches (fairly simple and ...
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24 views

Cellular communications queuing

Not sure if this is the right place to ask but this is a homework question. Consider a base station in a cellular network. The base station has the resources to handle 7 calls at the same time. The ...
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18 views

Using external directional antennas with 802.11ac MIMO / beamforming

I would like to add external directional antennas (Yagi or panel with ~30˚ horizontal/vertical beamwidth) to an 802.11ac router running DD-WRT. This is for an outdoor, field application where: ...
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36 views

issue communicating between pi zero w and Arduino nano with nrf24l01

I am trying to communicate between a pi zero w and an arduino nano with the nrf24l01 module. I have got very far and there are no apparent issues, besides no messages not being sent between them. for ...
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28 views

Experimental loss measurement of simple wireless link

I connect a simple SDR to a spectrum analyzer (SA) and measure the output power. The SDR outputs a single tone at 1 GHz; between SDR and SA is a lowpass filter: With gain setting GTX1 I measure -53....
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1answer
66 views

Low latency digital wireless audio transceivers

I would like to start a project developing diy low latency digital audio transmitters. Issue is there is not much information online and I'm unsure where to start. I live in England UK, I would like ...
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1answer
13 views

Possible Issues with battery Powered sensor and collector star network

I am designing a wireless Sub-Ghz network consist of many battery powered sensor nodes with a single collector node. For lowest power possible, the sensor stays most of the time in sleep mode waking ...
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2answers
80 views

Wireless game controller - polling vs events

I'm creating wireless game controller, but I have problem with sending data - should it be in polling mode or event based? For analog axes I think that polling is better. 100Hz or more polling rate, ...
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1answer
51 views

Is NB-IoT roaming possible?

I found a comment on a blog post stating that NB-IoT doesn't support roaming: nbiot do not support roaming (you must have sim from the operator that have the infrastructure). nbiot also lacks ...
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71 views

How to increase range of LoRa

I'm pretty new to wireless communication and Lora. I've read in many places that with Lora in urban areas "you can expect up to 2- to 3-km-wide coverage, while in the rural areas it can reach beyond ...
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19 views

First Fresnel zone and Epstein-Peterson method diffraction loss calculation

Let's say we have the following wireless communication system with obstacles located as drawn in this picture Solving this using Bullington method is straight-forward, only obstacles that fall into ...
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33 views

radio Link works with laptop but not with PC

I have a complicated issue. I set my HM-TRP radio modules to use: 117Khz receive bandwidth, 39Khz deviation frequency and 38Kbps air and data rate. The attached picture is my basic room setup for ...
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2answers
115 views

Antenna communication [closed]

How could I determine if 2 antennas could communicate knowing the distance between them, the power/gain of transmitting/receiving, and the sensitivity level of the receiver?
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37 views

How to use ESP-WROOM-32 to send wireless TX and RX commands from a PIC?

I want to have the possibility to send the commands of a PIC in a way that it's wireless and I thought it would be a good idea to use a ESP WROOM 32. In the datasheet it has the following schematic: ...
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29 views

measuring wireless (inductive) power supplies

I bought an electric toothbrush with a lithium-ion battery and wireless (inductive) charger. It came with one of those air/water jet flossing accessories, which also has a lithium-ion battery and a ...
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45 views

How do I get started on my RFID project (beginner)? [closed]

This is related to a recent, off-topic post I had linked here. I'm trying to make this post more for advice on my project, since I'm new to electronics and RFID and not entirely sure what I'm looking ...
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76 views

LTE Cat M1 vs NB-IoT : Building penetration

I browsed a lot search engines results to find any information (at "noob" level) about building penetration of these technologies. For my IoT project, I'm now using LTE Cat.4 as I didn't know before ...
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1answer
46 views

Increase emf received from a coil without changing flux source

I have a situation where I'm trying to increase the amount of power received by a coil. To my understanding, I can increase the emf (voltage) by doing one of 4 things: Increase the number of coils (\$...
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2answers
97 views

FCC certified module with uncertified antenna: technical or legal issue?

Say I have a consumer device that uses a pre-certified WiFi module. As I understand it, radio modules are certified with a fixed set of antenna choices that were included as part of the module's ...
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2answers
79 views

Is there a method to get the carrier from the recieved QPSK signal?

If we have given a signal and we know that is a modulated QPSK signal, can we recover the carrier if we know the carrier frequency fc. Edit: A clarification, I do not have to do it in hardware, a ...
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1answer
133 views

How to transmit complex numbers from USRP B210 using two antennas simultaneously? [closed]

I am using one USRP B210 board with two transmission antennas as my transmitter and another USRP B210 with single antenna as my receiver. My goal is to transmit a file such that I am using both the ...
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0answers
28 views

Rx's permanently enabled in IEEE 802.15.4 wireless sensor network

I am using atmel avr2025 to make a peer to peer wireless sensor network. I am fine setting up a star network but have problems when we want to send data to nodes not being the PAN coordinator but ...
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2answers
72 views

Can we band pass filter QPSK signal?

Consider we have QPSK signal with carrier frequency 10kHz. Generally, we demodulate or use matched filter on the the QPSK signal and recover the transmitted bit or the symbols. If the QPSk signal is ...
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0answers
9 views

How is n_pucch_2 in rrc layer computed

In LTE network I know that n_pucch_2 is used to indicate the resource index for pucch format 2/2a/2b. And I know its value is defined in higher layer. But how is the value computed and defined in the ...
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79 views

Tuning capacitance-matching circuit

I have designed an antenna for a WPT application. We already have a primary coil with a centered frequency of 13.56 MHz. We want to match the second coil at the same frequency and that's why we need ...
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2answers
206 views

Am I exposed to high levels of radiation at my job? [closed]

I made this post because I have a safety concern about my job as medical device tester. I was reading the user manual of the equipment I work with and found the next warning: “Per FCC regulations, ...
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1answer
64 views

How do I detect what kinds of signal(s) this device receives/sends

Xcortech 3300w - Component board So I have a somewhat hopefully simple question. I'm a bit of an amateur with on-board components and am trying to figure out what kind of signals this board receives. ...
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16 views

Modeling phase delay in high frequency resonantly coupled inductors

I am interested in simulating resonant wireless power transfer circuits similar to the ones developed by MIT and others. So far, I have been able to successfully create a basic simulation model of a ...
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1answer
55 views

Making QI charging desk

I want to make my desk surface into a QI charger but I want a large surface so integrating a pd wont work. Can I disassemble the charger and add multiple coils to it, or do I need to buy several ...
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2answers
113 views

Making a wireless lavalier microphone with ESP8266-07

I'd like to make a lavailer microphone and receiver using two ESP8266-07 Wifi modules. I'm using a condenser microphone with it's own preamlifier using 5V. I want to compare my signal with 300kHz ...

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