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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The RF 433MHz receiver code is working only when I reset the Arduino

I'm working on RF modules using Arduino but I observed the if statement is only running once and I need to reset the receiver every time to make it work with real-time changes in the transmitter. I ...
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Noise in RF 434 transmitter and receiver

I'm working on RF transmitter and receiver modules using two Arduino UNOs. I'm getting an additional noise on the receiver side in serial.println. To be more clear about the question. Hre is my ...
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Advice On Reliability of GSM Module - How To Choose The Right Module And Ensure It Will Be Reliable?

I need a reliable gsm solution for an Arduino. I will be using it in Denmark with Danish broadband. The specific tele-provider has not been decided. It will be used in connection with a Db sensor in ...
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Can't get 433 RF to work

I am trying to have two Arduino's to communicate to each other via 433Mhz units. My project is a bit more complex, but I since it was notworking I reduced it to most basic form in order to exclude the ...
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RF Keyfob single button code

I'm making a project where a 2 channel RF keyfob (433Mhz) controls an led using arduino nano. As for the hardware everything works and I have tested it with the example decoder code and it works fine. ...
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RFM69 Sending Failure

Hi I'm trying to get the RFM69 rf module to work on an arduino uno. Here is my code: #include <SPI.h> // Addresses for this node. CHANGE THESE FOR EACH NODE! #define NETWORKID 0 // Must be ...
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Can I just use one Arduino in a receiver/transmitter circuit?

I am trying to build a system to control lights remotely, but I am a student and am operating on a tight budget. Is there any way I can have just one Arduino along with a receiver and transmitter (I ...
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Select pin to connect RF receiver

I use the RCSwitch library receive signals with a RF receiver. I really need to change the pin the receiver is connected to on my Arduino Uno. What should I change in my sketch? What pins can I ...
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Node MCU not functioning correctly

i have a node mcu and i uploaded one example code to test it for rf signal decoding it worked. so after that i have written a code based on that and when i uploaded the code my node MCU suddenly isn't ...
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Decode rf remote signals with ESP32 or node MCU?

I'm trying to decide my rf remote signals using ESP32 or node MCU. I have tried with Arduino and was successful but for some reason it is not working on either ESP32 or node MCU even using the same ...
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How would one send radio signals from Arduino at a non-standard frequency

TL;DR: How would one send a fixed radio signal at 447,54MHz with Arduino? Background: I recently purchased a (receive only) SDR and recorded my garage door fob. I found it sends a fixed signal at the ...
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Directly synthesising an OOK modulated LF signal using a CSV file

I'm looking to transmit some data (CSV files) from a measurement instrument underground to a receiver on the surface. I've learned that in order to penetrate the limestone, low frequencies have to be ...
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RF sniffer with Arduino

Hello programmers out in the world. I am doing a capstone project for an RF sniffer to capture RF signals from Key fobs within an OEM manufacturing plant. I want to be able to decode this RF signal to ...
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2 votes
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I am trying to control a continuous servo (MG996R) with an RF remote but it's not working

I am trying to control a continuous servo (MG996R) with an RF remote, but it's not working; the servo just spins in one direction. I am new to Arduino so I don't really know if the code is correct. ...
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How can I get an Arduino Uno run the Feather9x_RX example?

How do I get this example to run on using an Arduino Uno. I've updated RFM95_RST, RFM95_CS & RFM95_INT to the relevant pins (2,4 & 3 respectively). This is the output on the Serial Monitor ...
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Shift between the carrier frequency of the signal transmitted with arduino and my garage door RC (433 mhz)

I have this 433 mhz transmitter and receiver for arduino. I want to replay my garage door remote control with this transmitter so I reversed the RC (remote control) signal with RTL-SDR/sdrsharp and ...
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2 votes
1 answer
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How to make a pairing and mode button on a remote control receiver

I'm working on a remote control project and have come across many different RF receiver/transmitter modules. Many have a pairing/mode button on the receiver that serves to pair the receiver and ...
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231 views

RadioHead library change the state when a new message is received

I would like to control a toy car from the server. I use RadioHead library for communication and it works fine. The application running on the server side is as follows. #include <...
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Looking for information and/or how to connect the RF433Mhz module (WL101-341/WL102-341)

I'm trying to find information about this 433MHz RF module: QIACHIP Apparently it can be connected to an Arduino with the RadioHead library, but I don't have diagrams of how to connect them togheter ...
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Rc switch library display received values only one times using serial monitor

I use Rc switch library to transmit and receive data. It works fine. The part that sends the data is as follows : #include <Arduino.h> #include <RCSwitch.h> RCSwitch transmitter = ...
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How can I interface, received HC-12 data and transmit the received data using sx-1278 RF-module in arduino-UNO?

I am currently working on a project, where I need to send data from first unit to the second unit which is a few km apart, so I decided to go with hc-12 RF module as it covers upto 5km. Then the data ...
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esp-01 with rf receiver keeps crashing

SOLVED: after may hours of testing i have solved the problem. it turned out to not be a software issue. the power supply i was using did not have a flyback diode and thus caused large voltage spikes ...
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legality of streaming data on 868 or 915 Mhz in EU/US

From what I read about duty cycles in the EU there is a 10% limitation (even less in some sub bands). The modules I found have a max. rate of 300 kbps. Even if you max out the duty cycle that would ...
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-2 votes
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Arduino respond to input from HT12D data output

Is there a way to connect a data output pin from an HT12D to an Arduino or ESP8266-12e input pin, then sense when the data pin is activated so I can have the Arduino or ESP8266-12e do something like ...
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RFID-RC522 not working properly?

So I'm working with an arduino uno and I want to read the UID from one card and write it to another with the code of Miguel Balboa but the RC522 doesn't appear to read anything on the serial monitor. ...
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Most Efficient & Cost Effective Home Automation Setup

I managed to build a system using Wemos D1 R1 connected to my website to retrieve data to power on or off a 5V relay. Now I would like to expand the project to control all my house outlet. Assuming I ...
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What NRF24L01 module is this?

I received my NRF24L01 Module today but I'm having a hard time finding any resources about this particular combination of modules! https://imgur.com/a/HrzpvdR I tried searching up the v200 1812A but ...
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Battery depleting on second prototype

I am working on a project which uses two 18650 3400ma batteries to power some sensors, an Arduino Mini Pro, an 433mhz RF transmitter and an ESP8266-01. Most of the time the Arduino is in sleep mode ...
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RF433MhZ - PWM with a motor driver freezes the code

LE: I'm almost certain that the problem is noise from the DC motor. I tried with a spare motor laying around and it had no problem, even if it had no capacitor on it's leads. So I tried adding all ...
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How to fix power overload when nRF24L01 connected for voice+gyro based headmouse?

For my head mouse project which is based on the voice recognition module V3.1 for left click, double click, right-click operations, I am facing a problem. I am using 433Mhz Radio Frequency one-way ...
2 votes
1 answer
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How to Fix mouse cursor lag on voice & movement based head mouse in wireless setting?

For my head mouse project which is based on the voice recognition module V3.1 for left click, double click, right-click operations, I am facing a problem. I am using 433Mhz Radio Frequency one-way ...
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ATTINY85 - RF Transmitter (RH ASK)

I am working on a small RF sensor powered by a battery. I used the code from Mr K. (https://arduino.stackexchange.com/a/55516/65870) as base and adapted it to the RH Ask protocol: #define F_CPU ...
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Antenna for ESP32-pico-d4

I am currently playing a bit around with the esp32-pico-4d, it does not have an onboard antenna, so an external antenna is needed, tho I don't know a lot about it so a little help would be appreciated....
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424 views

Can I check if a message has been sent successfully using Radiohead_ASK?

I'm new to Arduino programming and I'm trying to get a simple 433 MHz transmitter and receiver module working on an Arduino Uno board. Unsurprisingly, it's not working as expected and I'm trying to ...
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564 views

Setting up 433 MHz Transmitter and Receiver in the same Arduino sketch using Radiohead

I have set up a 433 MHz transmitter and receiver pair on one Arduino Uno board. Using the RCSwitch library, I could successfully send and receive signals. Using the Radiohead library however, I could ...
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Start VL53l0X measurement failed

The initialization of the ToF fails with this code. I'm trying to frankenstein it with Radiohead RFM69, so far no luck. // rf69_reliable_datagram_client.pde // -*- mode: C++ -*- // Example sketch ...
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Arduino encrypted Radio communication

Is there any way or library to communicate two Arduino devices with encrypted connection using modules NRF24L01 or "433Mhz RF" ? Similar encryption like CCMP in Wi-Fi network.
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1 vote
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723 views

Wemos D1 Mini using RF with RCSwitch

I’ve bought a RF transmitter and receiver on eBay and I’m trying to get my garage door codes with my Wemos D1 Mini. I’ve downloaded the RCSwitch library, hooked up the receiver to ground, 5v and ...
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Radio receiver: deep sleep when no byte arrives, and wake up when a byte arrives?

This code works to listen for bytes via radio (with a 433 Mhz receiver module) with the Manchester library and Manchester code, and do an action when certain bytes are received: #include "Manchester....
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SD Card and Lora module arduino uno

Background: When working on the 2 modules separately they were working perfectly. Problem: In the code attached we tried integrating them but Lora wouldn't receive any data unless we commented out ...
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Can I use an RF Receiver to any pin on an Arduino?

I have a project that uses a nodemcu and it includes an rf receiver, I created the pcb board already etc etc... so I've already chosen D7 (GPI013) before reading on connecting the rf receiver and ...
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STM32 Nucleo-L432KC can't send data to Arduino Uno via nRF24L01 module

Hello everyone. First of all, I know you're going to tell me to send my question on the stm32duino forum. But I tried to enter the stm32duino forum and I didn't succeed (I think their forum is closed)...
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Is it possible to transmit radio signal with cheap 433Mhz transmitter as strings and receive it with an RTL-SDR

I have these Arduino transmitters and receivers. They are very common. I am just trying to transmit a "Hello" Message using this code. #include <RH_ASK.h> #ifdef RH_HAVE_HARDWARE_SPI #include &...
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Is this the right way of using an RF communication?

I have a 433Mhz Superheterodyne receiver and a hand set remote of similar frequency, I'm using the RC-Switch library and I couldn't find a better way than using the "numbers" that I'm receiving like ...
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Creating PPM signal from 4 integrers

I am currently building a MultiWii based drone, I have built the emisor-receptor that interface 4 analog signals(4 potentiometers to control the drone) and it works perfect, the receiver(arduino Nano, ...
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Ultra Long Range (200-500km) Arduino Communication using a Gibson Girl

I came across this article on Hackaday showing a simple AM transmitter sending a morse code tone 700km! I'm looking into a EPIRB for myself while deep in the bush / outback hunting or camping, just ...
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RF Rx with NodeMCU error

I am using RF Tx with Arduino Uno and Rx with NodeMCU. I use RF switch library. At the recipient side if I use an Arduino Uno MCU. I can receive the output, but with NodeMCU I have a blank serial ...
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Radio tx/rx makes my oled screen not work

I've been struggeling with this assignment for school for a couple of days. I have finally figured out where the problem lies. I have an oled screen that is supposed to print out the temperature of a ...
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Decoding RF Signal

I have a motorized curtain and I'm trying to understand its rf control signal in order to control it from my arduino. I got the times, and checked the code is not static. I believe it has some kind ...
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2k views

Arduino secure two way communication over radio

I would like to implement a secure communication channels between 2 arduinos communicating over 433 mhz radio modules (to be more precise using the barebone Atmega 326 chips). I know that the lack of ...
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