Questions tagged [rf]

Radio Frequency. Typically used to refer to the radio portion of the electromagnetic spectrum which is used for wireless communication. Strictly speaking though, RF can refer to any oscillation (electrical or otherwise) at the associated frequency.

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data streaming using Bluetooth + RFduino

I am trying to send ECG data using RFduino. I am using two RFduino modules. The transmitter module is using the device code while the receiver is using the host code. I have common baud rate between ...
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Set up mesh network with RF Transceivers

I would like to set up a mesh network of Arduinos with the following features/capabilities: No master node Arduinos capable of bootloading other Arduinos through RFs Capable of communicating over TCP/...
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Can a cheap RF module be used for two way communication

Can a cheap RF(transmitter and receiver) module be used for two way communication, not at the same time of course but for example arduino A sends string to be printed on lcd the arduino B receives it ...
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79 views

Change RF Receiver Frequency by Antenna Length

This may be a very stupid question, but I have got me one of those cheap 433 MHz RF modules for the Arduino. I'm wondering if I can vary the receiver's frequency by simply changing the length of the ...
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What is wrong with my code? Did you forget '()'?

#include <SimbleeBLE.h> // constants won't change. They're used here to set pin numbers: const int ButtonPlayPause = 15; const int ButtonNext = 12; const int ButtonPrevious = 11; const int ...
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495 views

RF transmitter with external 8-12v power not working properly

So I have this pair of transmitter and receiver RPI is powered by USB from laptop Transmitter is connected to Attiny85 being interfaced from RPI at 3v3 Receiver is connected to Arduino at 5v If I ...
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891 views

Attiny85 not able to understand data from 433Mhz using VirtualWire.h

The basic plan is to have a Attiny85 pass information from a 433Mhz RF module to another chip/Arduino via I2C using VirtualWire and Wire libraries. I have been able to make this system work on their ...
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3k views

Powering an Arduino Mini Pro using a CR2032 battery as a remote control

I'm looking into making my own remote control using an Arduino Mini Pro and some RF transceivers. The receiving end won't be a problem, but the remote will. I want to make it as small as possible and ...
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72 views

Using servos in voltage sensitive circuit

I'm currently using a breadboard Arduino Uno clone. Basically a Atmega328p powered using an L7805 linear regulator with a 10uF capacitor on both the input and output. The Atmega328p is connected ...
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2k views

RF receiver for integer only, how to cast uint8_t to int?

I'm using the RadioHead library with ASK Driver to transmit/receive data with generic RF modules. It works fine, but I'm lacking some knowledge in programming the code to use the data received. Most ...
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581 views

How to use an Arduino to measure speed of rocket

I am not very experienced with Arduino and I am trying to learn it. I was wondering what is the easiest and most effective way to calculate speed and log it every second so to say. This would be ...
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671 views

Sending and receiving data using 433 Mhz from Arduino to Arduino

Following this tutorial: https://tutorials-raspberrypi.com/let-raspberry-pis-communicate-with-each-other-per-433mhz-wireless-signals/ I was able to easily send code from one Raspberry Pi Zero to ...
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717 views

How to make two WIR 1186 RF transceivers communicate over serial communication?

I want to have two RF transceivers communicate, one as transmitter and one as a receiver, for longer distances. For that I'm using WIR 1186 RF modules with Arduino. Pin connections are as below: ...
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44 views

RF receiver becomes weakened after motor turns on

I recently bought a simple SMAKN 315MHz RF receiver and transmitter, and I got everything working so that the transmitter transmits the value of a joystick, and the receiver receives that and uses it ...
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3k views

NRF24L01 receiving even if no data sent

I am using nRF24L01 to communicate between two micro controllers. Both are Arduino Uno. The question i have here is , even if i do not send any data from sender to receiver , the receiver device is ...
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762 views

Arduino UNO/Nano communication with SP1ML-868 module

Good evening, I'm trying to establish serial communication between an Arduino UNO/Nano (ATMega328P) and a SP1ML-868 RF radio module (http://www.st.com/en/wireless-connectivity/sp1ml.html). I can talk ...
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Two nRF24L01 radios per Arduino

Due to the results of my previous post (Slower nRF24L01 round trip delay than expected) I found out that it will be quite difficult to reach my latency requirements. I am thinking about using my own ...
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281 views

Possible reason for broken Uno

Yesterday I wrote in a comment that I didn't break much, except a LED and a LED matrix. However, exactly yesterday I think my Uno gave up, since I cannot upload a sketch anymore (timeouts). For the ...
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997 views

RadioHead Library custom configuration for RFM96 LoRa

I have a pair of Adafruit RFM96W LoRa Transceiver Breakouts and want to use them with the RadioHead library. My pair of radios works if I use the example sketches from the adafruit tutorial, but I ...
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1answer
783 views

How to control continuous rotation servo via HC-12 rf module

I am working on a project to wirelessly control a continuous rotation servo...something like a wireless vending machine. The problem I am having is controlling how many revolutions the servo is ...
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8k views

Decoding 2.4G RF remote controller?

There is tons of information on how IR remote controls work and how to use an Arduino to decode those signals and use any IR remote to suit your project. But I couldn't find much info about 2.4G RF ...
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Arduino Uno doesn't work as Manchester code receiver

I'm sending some data from ATTINY85 to Arduino UNO using 433Mhz modules. Coding is Manchester using Manchester.h library from here. Transmitting data works perfectly, 433 receiver gets data alright. ...
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624 views

Manchester.h message format

I'm sending some data by 433Mhz transmitter using manchester.h library from here https://github.com/mchr3k/arduino-libs-manchester and I'm trying to wrap my head around message format. In manchester....
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62 views

Replacing BT module with 433 MHz transreceiver module

I have made a prototype where I can send data from one arduino to another via Bluetooth(hc-05), they are working fine, but now I want to replace the BT module with RF module, how can I do that???
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924 views

Manchester 433MHz Nano to ATTiny85

My transmitter is a Nano, the receiver is a Tiny85. I use a Logic Analyzer to check if stuff is moving, I can clearly see data coming in at the receiver. The receiver does not 'decode' the data, man....
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569 views

Char transmission using Virtualwire RF signal

This is a really basic problem, but I haven't been able to resolve it myself and would really appreciate the help. So I've been struggling for a few weeks now to set up RF communication between two ...
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1answer
371 views

Radio Issues with RF69HW

I am working through this tutorial on using the RF69HW. The RF69HW datasheet can be found here. I am using an Eegoo Uno R3 and yes I am aware that the Arduino is a 5v and the RF69HW is a 3.3v board. I ...
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1answer
271 views

Brownout with Arduino Nano

I'm making an RC car with the Arduino Nano. I'm using RF433 as wireless communication with 2 motors and L293D as the motor driver. I use 4 1.5V batteries to power the Arduin and another 6V battery ...
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1k views

How do you debug SPI connected devices?

EDIT: Changed the title to better express what I'm after. I've been dabbling in connecting two Arduino Nano 3's with the RFM69HCW breakout for the past 5 days.. but got nowhere. I've followed the ...
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2k views

How to use get_properties to get RSSI in RF24?

As picture below, how to use get_properties ? I fail to understand AN625, how to use get_properties to get RSSI ? Adding source code based on RH_RF24 functions. #include <SPI.h> #include <...
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2answers
77 views

Problem with combination of Bluetooth and RF 434MHz with Arduino Mega

I want to receive text from Bluetooth from an android phone to Arduino Mega. Then I want to send that text to other Arduino UNO through RF 434MHz. Here is my code for Transmitter. #include <...
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413 views

What is the principle of scanner

I find a 2.4GHz scanner in this web . I want to do same thing in 433 Mhz with SI4463. But I fail to understand it's principle. Who can explain it ? Thanks.
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694 views

RF signal boosting [closed]

I'm working on a quadcopter project. The quadcopter will be quite autonomous, but sometimes I'll need to send some messages to it. So I built a simple, one-way RF communication system based on two ...
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4k views

Multiple (3) RF transmitters to a single receiver?

How can I have three remote transmitters send distinct signals to a single receiver? My project requires 3 remote controls, each with 2 inputs. I need to distinctly identify these 6 signals from ...
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2answers
1k views

read AM signal only with an Arduino

Some people have managed to send simple AM signals with just a bare Arduino. An example is here. This works thanks to the fact that the PWM can reach high frequencies and, setting the divider properly,...
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1answer
88 views

Read signal from co-ax cable with ADC

I have an Arduino Uno and I'd like to read a signal from a co-ax cable with it. The cable carries 12VDC (power for other components) along with a signal (of about 1 Ghz frequency). How do I go about ...
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181 views

How to use setModemRegisters in RF24

The below picture is the introduction of setModemRegisters . First: What is the mean of ModemConfig* config? I mean: how to write the parameter. Maybe just give a example, and it will be better if it'...
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1answer
445 views

Speed of comunication by SI4463 under RH_RF24.h

As in this SO question, I use use a RH_RF24.h to control an SI4463. In RH_RF24, there is not anything about the speed of communication. I need the way to control the speed of communication. Because I ...
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1answer
2k views

How to program an nRFL01 RF module that is connected to a pc via a USB to UART/TTL adapter?

In a few of my previous questions I was told that the nRF24L01 RF Module can be connected to a pc using a USB to UART/TTL adapter. After a bit of research I understand that one way to use it is to ...
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661 views

Can the EWRF 3022 module be directly connected to the pc totransmit data from the pc wirelessly? [duplicate]

In my project I want to connect my pc to an RF transmitter. The receiver will be connected to an arduino on my robot. However most of the RF modules I looked up couldn't be directly connected to my ...
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1k views

How to connect an RF module directly to a PC without using an arduino? [closed]

I know that in xbees i can connect the xbee module directly to my pc using the USB explorer. But I'm using the nRF24L01 RF modules. I want to transmit from my pc, via the RF transmitter to my RF ...
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2answers
3k views

Transmitting Variables over RF

I'm using the 3715 RF arduino modules and a hc-sr04, and i'm trying to send the distance i get from the ultrasonic over to the arduino with the rf recieving module but i get something like this: ...
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1answer
781 views

options for wireless data broadcasting to hundreds of nodes

I would like to build approx 100 arduino devices that can talk to each other, I have a set of constraints that I'm looking to get some insight on : all devices would operate within a 300 meter ...
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33 views

433M modules w. soldered 34.6cm antenna, first test

I'm doing a first tx/rx on a pair of modules, and some hams have alluded that they 'autoadjust' - since I've soldered halfwave antennas onto the modules, what's the optimal range for first tests? And ...
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652 views

Problems with transmission between ATtiny85 and Arduino Uno with 433MHz RF modules and Manchester

I am trying to transmit from an ATtiny85 running at 16MHz internal clock to an Arduino Uno with the Manchester Library. The problem is that the Arduino is not receiving any data. I have hooked an ...
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1answer
5k views

Send RF 433MHz data to Domoticz RfxCom with protocol X10 from Arduino Nano

I have installed Domoticz on Raspberry Pi and bought an RfxCom 433MHz emitter/receiver. It works well for example with Chacon DiO 54781 door sensor. I want to create my own sensor with Arduino that ...
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2k views

nRF24L01+ packet loss caused by Arduino reading and communicating with sensors

I have 2 Arduinos communicating with each other. My problem is that one sends packets every 1.5-2 seconds but the other Arduino does sensor reading and data uploading with a Wifi module, which may ...
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1answer
1k views

Arduino - RF 433 Mhz transmitting string and but receiving ASCII values of those characters

When I am using RF 433 MHz module with ARDUINO MEGA then it is transmitting any text or anything in ASCII values. Now how to decode those ASCII values to alphabets? If I use ASCII conversion programme ...
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229 views

Send button press over RF

I'm trying to send a button press over RF (performing a closed circuit operation on the receiving end). I have a controller with an UP and DOWN button. Unfortunately I am limited to the cable length, ...
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750 views

Reduce 5v Trinket Pro to 3.3v?

Apparently these nRF24L01+ modules need 3.3v, but I've only got 5v Trinket Pros that I'm using. How can I reduce the voltage to the RF transmitter? Would a voltage regulator work? Specifically ...