Questions tagged [radio]

"Radio" here refers to wireless communication other than normal wifi or bluetooth bands, e.g. FM, shortwave, and RC.

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40
votes
5answers
124k views

Add an external antenna to a Pi 3

Makezine's writeup on the Pi 3 this morning included a somewhat tantalising section: The other interesting thing on the back of the board, right next to the wireless radio chip, is something that ...
26
votes
1answer
6k views

Why can't the Pi 3 receive FM radio by itself?

I've read online that the Pi 3's WiFi/Bluetooth chip (BCM43438) can also receive FM radio. Why can't I use it to receive FM signals?
16
votes
4answers
68k views

Receive FM Radio on Raspberry Pi

I want to feed the FM radio signals to raspberry pi. Having a basic understanding of electronics, I figured out that a FM receiver and an ADC is required. Now I need help on how to proceed with the ...
8
votes
2answers
8k views

How does the RF/FM GPIO transmitter hack work?

A while ago, a few guys figured out that they could transmit FM signals using the Raspberry Pi's GPIO ports, and another person realized that he could use the RasPi for controlling his home automation ...
6
votes
4answers
1k views

How much electromagnetic or radio interference is caused by a typical unshielded Raspberry Pi?

Most desktop computers come with metal cases, which have a side-effect of blocking the radiofrequency emissions or electromagnetic radiation which is produced by the internal electronics. Back when ...
6
votes
2answers
5k views

Output power of the Raspberry Pi Transmitter

I have figured out how use the Raspberry Pi to transmit FM Radio, but I also know that this is illegal. All transmitters over 500mW required a licence. What is the output power of the Raspberry Pi (in ...
6
votes
2answers
903 views

Is there any way that you can receive radio signals on your raspberry pi?

Since the Raspberry Pi can do frequency modulation by using the PiFM to turn your raspberry pi into a transmitter, is there anyway that you can receive VHF on your Raspberry Pi?
5
votes
2answers
171 views

Gather data in rural areas

I am building a prototype with temperature and humidity sensors for rural areas and I am trying to determine which is the best way to gather data, since Internet may not be available (no WiFi). I am ...
4
votes
4answers
4k views

Is it possible to trigger 10 (or 100) Raspberries to take photos at the same time using WiFi?

Can a system consisting of 10x Raspberry Pi's, 10x RPi Camera Modules + WiFi dongles be reliably & consistently synchronized over WiFi to take photos at the same time? Or are radio triggers a ...
4
votes
1answer
6k views

Send and receive 868Mhz radio signals

In my home I have sun-shade that I can control via a handheld transmitter. I already figured out that it is sending on 868 mhz. Now I'd like my raspberry to read send those signal instead (or as well ...
4
votes
3answers
651 views

PiFm dBµV/m without an antenna

I have been wanting to tinker with the Raspberry PI to learn more about electromagnetic frequencies; however, before initiating anything, I read the legal debates regarding PiFm. It appears that both ...
4
votes
2answers
851 views

433 Mhz transmitter on RPI always sending 00000000

I've bought a Realtek RTL2832 DBV for my RPI to read 433 mhz data and a transmitter HM-T433. I can successfully receive messages from two 433mhz remotes with the rtl_433 utility, but when I try to ...
3
votes
3answers
1k views

RF 433 MHz cannot transmit or receive from more than 10-30 cm

I have 3 Pi's and a transmitter and receiver on all of them. We are trying to just send a number from Pi 1 to Pi 2 and have Pi 2 send back a response. We followed the instructions in https://www....
3
votes
2answers
2k views

Detecting electromagnetic field with Raspberry Pi

For my school project, my objective, among others, is to detect EMF changes (frequencies between ~400MHz and 2,4GHz) in a room (to simplify it even more, let's assume it's gonna be very small room/...
3
votes
2answers
5k views

./RFSniffer failes on Raspberry Pi 3

I`m trying to send a message over 433MHz with my raspberry pi Link to hardware Sender and Receiver are connected. Here is a Link to the tutorial I used to connect sender and receiver (Link) wiring ...
3
votes
1answer
954 views

Filtering noise w/ pi as FM transmitter and sound source

I have an I2C FM transmitter for the pi; it has a 3.5mm stereo jack for input. Everything works great -- I attached a short dipole antennae and get clear reception for at least 25'. However, if I ...
3
votes
0answers
4k views

Pi bluetooth not detecting any devices

Board: Raspberry Pi 3 I have a Pi which is unable to detect any bluetooth peripherals. I diagnosed the bluetooth service by running sudo service bluetooth status which throws the error Failed to ...
3
votes
0answers
1k views

Bluetooth Input Not Outputting High Quality Audio to FM

I have Raspian Wheezy running on my Raspberry Pi. I have set it up to run pifmplay and output the sound to HDMI - (Pin 4 on GPIO) so that the Pi is now working as an FM Transmitter. This part works ...
2
votes
1answer
1k views

Remote Control Raspberry Pi

Is there any other way to remotely control the raspberry pi? I built a 4 wheeled robot that is automated by ultrasonic sensors, yet today I have to decided it to make it remote controlled, what are my ...
2
votes
1answer
530 views

How do I connect my PHAT-DAC to the Adafruit class D stereo amp

Following on from my previous question here I have the Adafruit 2.1 W stereo amp and now I'm researching how to connect it to the Pimoroni PHAT-DAC. I've found plenty of references to a mono amp but ...
2
votes
1answer
732 views

Do I need an amp if I'm using a PHAT DAC on my Pi Zero?

I've bought a Pimoroni PHAT DAC for my Raspberry pi zero and despite weeks of searching I can't find a definitive answer on whether I need to get an amp breakout board too like this guy http://...
2
votes
3answers
1k views

Communication between radio transmitter (device A) and receiver (raspberry)

My project is to build a raspberry based emergency button for use at home (if someone feels unwell, for example). I would like to use the raspberry pi as a receiver of a signal sent by a (short-range?...
2
votes
1answer
666 views

Pi based Radio Telescopes?

I'm interested in building a Raspberry Pi based radio astronomy telescope. I'm not too set on any particular science objectives, but rather just want to get some experience with the full system, learn ...
2
votes
1answer
1k views

How to communicate with a raspberry pi cube satellite?

I am planning to build a cube satellite that will be above 150km - 600km altitude in the LEO(Lower earth orbit). What can i use to communicate with it. How would that work? I know I will need a radio ...
2
votes
2answers
2k views

Controlling a common RC car

I need to test my computer vision stack written in C++ on a mobile robot and I need to control the robot from a Linux ARM board (which can be a Raspberry Pi). Since the specialized wheeled robot ...
2
votes
0answers
69 views

Unable to intercept the code of my remote control at 433 MHz with RaspberryPi

I'm trying to reproduce the code generated by my universal 4-channel radio control with RaspberryPI. I cloned my remote with a universal remote like this: I used the libraries included in 433Utils ...
2
votes
0answers
984 views

Transmit 433 MHz Manchester from Arduino - receive on Rasberry Pi

On Attiny85 I'm using Manchester encoding library with code #include <Manchester.h> #define TX_PIN 1 uint8_t transmit_data = 123; void setup() { man.workAround1MhzTinyCore(); man....
2
votes
0answers
1k views

Loopback to aux out and record audio at the same time from audio in

I am currently developing a device that silences adverts from a streaming radio. Im taking audio input from a radio to a USB sound card.To silence the ads, I have am currently using the arecord ...
1
vote
1answer
2k views

433mhz RFSniffer doesn't recognize signal

as in the tile, I've tried to sniff a 433mhz radio signal with my raspberry pi 3b but something failed the receiver is one of the cheaps available in the web, 5v powered. I've followed this tutorial ...
1
vote
3answers
2k views

Correct wiring for 433MHz transmitter/receivers?

I have ordered some of these commonly used 433MHz transmitter/receiver units with the intention of using my Pi GPIO pins to send and receive radio signals. I have my approach mostly figured out, but ...
1
vote
3answers
1k views

how to make radio wave with pi2

As pi2 have processing power of 900MHz it can generate upto 250Mhz radio frequency. I have run fm_transmitter on pi2 it was working but only with one song(star_wars.wav) and code was in c++. Does ...
1
vote
1answer
128 views

Raspberry Pi / Low-power FM transmitter?

I recently got a Raspberry Pi 400 and I tried this https://github.com/markondej/fm_transmitter without an antenna. The range was approximately of about 5 feet, from what I could notice. Now I've heard ...
1
vote
2answers
749 views

Using EnOcean PI 868 with raspberry PI4

first of all: I'm new to raspberry I.ve just bought a raspberry PI 4 together with an EnOcean PI 868 module to set up a house automation system. To make it run I've tried the steps described on the ...
1
vote
1answer
1k views

PiFm RDS cuts off after a few seconds

I am using my Raspberry Pi as a radio transmitter. I'm using the Pi FM RDS program. It works fine for a few seconds, but then it just suddenly stops broadcasting the sound. The program is still ...
1
vote
1answer
55 views

How is the radio module connected to motherboard (CPU) on Pi-4? [closed]

By this link we can see that in Pi 4 there is Wi-Fi module (called radio module under the picture). But I can't figure out, how is this module connected to motherboard? Is this PCI bus or whatever? ...
1
vote
1answer
1k views

How can Rpi4B use UART to read and analyze received data at a 3DR FPV Air Radio Module?

I am trying to set up the FPV telemetry radios (Air and Ground Module 433MHz). I have connected the Ground module to my laptop (USB) and air module to Raspberry Pi 4 UART pins. Using Mission planner ...
1
vote
1answer
90 views

Radio Transmission

Yes, I pretty much a noob, but I was wondering if there is a way to program the Raspberry Pi in Assembly Code to transmit data via radio frequencies (like remote control) between itself and another ...
1
vote
3answers
6k views

AM/FM receiver that can be tuned through raspberry pi?

Is there an AM/FM receiver that can be hooked up to the raspberry pi and be tuned by the pi? I am building a radio and obviously need a receiver, and I want to be able to tune it through the pi. I am ...
1
vote
2answers
2k views

Omxplayer change volume when playing

I am trying to change volume. OMXPlayer is not using ALSA so it is not reacting. I am playing live radio stream and I want to change volume of it without stopping the radio. Is this possible? If yes, ...
1
vote
1answer
5k views

Can I transmit I2C over RF?

Is it possible to transmit and receive i2c data wirelessly (not via wifi or ssh) I want to use thumb stick joysticks to move motors wirelessly, at the moment I have two connected to the i2c ports ...
1
vote
1answer
182 views

Pi-mote sockets not picking up signal from RPi

I bought a Pi-mote control kit which is a radio transmitter control add on board and mains electricity socket switched by their own radio receivers. However I can't the sockets to pick up the signal ...
1
vote
1answer
544 views

RF Communication between 2 Pis

I am making a quad-copter for raspberry pi. I have the physics engine build, but I need a way to control the quad-copter. So I basically need to send about 20 unsigned Integers from one pi to the ...
1
vote
0answers
39 views

I would like to control my Traxxas Stampede with a raspbery pi

So i want to make basically a glove where when i tilt my hand it will turn the car. (I'm going to just have simple buttons for forward and back so I only need to focus on one tilt plane) I plan on ...
1
vote
0answers
63 views

FM Receiver with raspberry pi

I was wondering if there was any way to make a software-only radio that will use all the components included in a raspberry pi 3B+. I've been doing some research and all of the FM models that I found ...
1
vote
0answers
23 views

three position on/off/on

Hi I am converting a 1963 Roberts R300 transistor radio into an internet Radio. I will be using a raspberry pi for this and as the radio has a three position on/off/on switch to choose between long ...
1
vote
0answers
50 views

Inject audio and broadcast/stream over internet

I like to attach an FM tuner like Si4703 to raspberry pi 3 and want to rebroadcast particular frequency (FM) over the internet (I want to listen to local FM when I'm in my office since I don't get a ...
1
vote
0answers
286 views

pigpio: Read PWM from RCcontroller then send to ESC via GPIO

Im trying to learn Python by combining my interest in designing an AWD radio controlled car (3D printed, Im decent with Fusion 360 too) with some smarts from Pi/Python to allow things like software ...
1
vote
1answer
73 views

Dynamically setting address of HT12E

I have a project where I need to send a wireless signal to one of several receivers to turn on an LED. One transmitter, several (many) receivers, each with an LED. The receivers need to have low ...
1
vote
0answers
1k views

Control 868MHz device from a RPi4

I am trying to control my electric blind (elero brand, controlled by this remote) from my RPi4, and while I'm fine tinkering with anything on the software side, I must admit my knowledge of GPIO and ...
1
vote
0answers
186 views

FM Radio with HifiBerry Amp2

Is there a way of running a Raspberry Pi 3 with a mounted HifiBerry Amp2 together with an FM Radio Module e.g. TEA5767 FM Radio Breakout Board? Currently I set up my RPI to run Mopidy and Spotify ...