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Questions tagged [radio]

Do not use this tag for Radio buttons. Radio is the transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, or a device for doing the same. Radios are typically used for communication including voice, video and data. This includes Wi-fi, Bluetooth, Mobile phones, GPS, Radar, some remote control devices and near field communication devices (NFC) such as contactless smartcards.

Radio is the transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, or a device for doing the same. Radios are typically used for communication including voice, video and data. This includes Wi-fi, Bluetooth, Mobile phones, GPS, Radar, some remote control devices and near field communication devices (NFC) such as contactless smartcards.

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Android device radio ROM programming

I need to get access to some functions of radio ROM, which lays underneath of Android OS. After some googling I've realized that it's nearly impossible, since sources are hidden - at least for straightforward chips like Qualcomm's Snapdragons. I…
Barmaley
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RFM69 Radio Transceiver: Arduino is not registering acknowledgement for transmission sent by Raspberry Pi

I am building a system in which an Arduino Uno with an RFM69 radio chip transmits data to a Raspberry Pi running a script in Python. I am using the RFM69 library for both scripts: Arduino: https://github.com/LowPowerLab/RFM69 Python:…
Triz
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Implicit chunk serialization

I'm currently trying to simulate a little cognitive radio network with omnet++ using primary/secondary sender/receiver nodes. To make it work, I had the idea of configuring the primary sender as a node that talks whenever it wants and configuring…
H.Inci
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Timeout when read data by radio (NRF24L01 PYTHON)

I'm working with NRF24L01 in python and I'm confused about reading data. I have simple function to read data for 20 seconds. There is no problem if I get some data but if there is no radio signals my program stuck on "radio.read(revc_buffer)" till…
KyluAce
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How to apply the CRC16 on a received bitstream? (Python)

could anyone here help me understand, how I apply the CRC16 on the received string? stream = [0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,…
Andreas Hornig
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Is the value of an Android phone's radio type always GSM, LTE, CDMA or WCDMA?

I'm creating an app that uses Google's Geolocation API, as documented here. As part of the POST request I need to send to their API, I need to include The mobile radio type, radioType. The question of how to receive that has already been asked and…
finnss
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C++ While(1) loop is not calling if statement inside it

I've got an interrupt that sets a flag, a bool called recvd as so: while (radio.available()) { // Fetch the payload, and see if this was the last one. radio.read( &receive_payload, len ); recvd =…
foldone
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Building an own socket API to send UDP packets over LoRaWAN

I'm building a LoRa network where the server and the end-device need to communicate using a protocol which normally transmits data via UDP. Due to the fact that these two protocols act totally different I need to find a way to combine those two.…
wanssemd
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how to calculate multipath signal, delay, angle between 2 signal?

I am trying to understand how to calculate the phase angle, delay, and multipath signal. I hope everyone can help me for ideas. My scenario: I have a radio hardware (SDR) with rx1 and rx2, and the TV station (center frequency = 533MHZ, bandwidth =…
long khong
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Sending Int via VirtualWire (433MHz)

Transmitting Device: Arduino Micro with 433Mhz Transmitter via VirtualWire and an Ultra Sonic Sensor. Both Connected to 5V and Ground as well as: Ultra Sonic Sensor: Trigger Pin: 11 Echo Pin: 12 433 Transmitter: Transmitter: 11 my code so far using…
Peter S
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Transmitting 433Mhz Message with VirtualWire to PIGPIO

Transmitting Device: Arduino Micro with 433Mhz Transmitter via VirtualWire Receiver: Raspberry Pi Zero with 433Mhz Receiver via PIGPIO Transmitter/Receiver Hardware: Classic Cheap China Stuff (Link) I am new to 433Mhz stuff and I am having problems…
Peter S
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Extend range of rc522 RFID reader on Raspberry Pi to 0.5m

I'm trying to find a cheap way to get a RFID reading at about 0.3m-0.5m. I currently have a Raspberry Pi 3, and a rc522 RFID reader (code in python). I can't seem to get a consistent estimate of the max range of this unit. I've heard that you can…
ljc
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Emulate the addition of new computers the local network

I am posting here concerning the emulation of computers on the local network, without destroying the local network. When a computer connects to wifi on your local network, the computer can be seen in the "Network" section of Explorer(on Windows) and…
user6767685
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How to get CellInfo, SNR, UARFCN, BandWidth... on iOS9.x

I want radio information with CoreTelephony.framework on iOS 9.x. And I tried the following this question. Get CellID, LAC, ... on iOS 8.3 Add this xml on plist, com.apple.CommCenter.fine-grained …
Io Ohta
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android using GSMPhone to communicate with rild

I'm working on a non phone device that run Android 2.3.3. We have a custom Android version (with some additionnal driver) and my application has "system" privileges since we build our apps with the same key used to build android. I had unlocked full…
Zedday
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