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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29
votes
1answer
50k views

Whats the difference between RF options (wifi, xbee, NRF24L01)

When doing RF, you have many options. Three of the most basic are in the title box WiFi Xbee NRF24L01 What are the practical differences in using them. What is the purpose of each other and the pros ...
10
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4answers
5k views

Choosing wireless tech for lowest possible lag

I am drafting a pub quiz project, where the Referee gives a signal and multiple players push their buttons. The first to push wins the right to give an answer. I want all buttons (referee's + X ...
9
votes
2answers
1k views

RFID/NFC (13.56 MHz), is it possible to send raw bytes and receive response?

I'm trying to implement a card reader (i.e. credit cards) for shopping purposes, and AFAIK those cards are ISO 14443-A compliant (Mifare Classic 1K). I already made an Android app that can send custom ...
8
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3answers
6k views

Manchester Library Won't Compile for Attiny85

I am creating a wireless sensor using an Attiny85. I want to send the data to an arduino uno, so I purchased the 315mhz rf link kit from spark fun. Since the Attiny85 does not have a TX I decided to ...
6
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5answers
19k views

433mhz range optimization

I would like to get the best range possible from my 433MHz modules. After A LOT of searching and reading, I'm convinced I should be able to cover 10m indoors with free line of sight. [update] After ...
6
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4answers
16k views

RF remote control using VirtualWire on ATtiny85 running at 8MHz on internal oscillator

I'm trying to make an RF remote control using ATtiny85 running at 8MHz on internal oscillator, this cheap RF 434MHz transmitter module (like the one below), and VirtualWire lib, but had no success so ...
6
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1answer
606 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 ...
4
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2answers
1k views

How can I get ultra clean dc wall power for my arduino project?

I'm doing an rfid project that requires a read range of at least 5 inches or about 13cm. I'm using a nano with a usb port, a rfid reader from priority 1 design and a large antenna. The problem I'm ...
3
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2answers
2k views

Wirelessly communicate between two Arduinos without router

I want to "connect" two Arduinos, without using wires. The range is ~0.2 miles (300 meters). Using Google, I saw too many options. The idea is to build something like a beacon, so the bandwidth can ...
3
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1answer
4k views

Attiny85 and 433Mhz RF

I have this cheap RF link that I had working with the Arduni UNO, but I wanted to make it smaller and ATTiny85 should do the trick. The RF module is connected (data pin) to PB3 on the ATTiny. But I ...
2
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1answer
4k views

Sniffing RF signals

I am using an Arduino UNO and an RXb6 (I would link to the data sheet if I could find one) to try to decode a RF Signal that controls a remote outlet. I have the devices connected as you would assume ...
2
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2answers
815 views

Which wireless technology should I use for medium range, many to one, bidirectional communication?

Some clients, let's say 5 <= x <= 10, have to send information wirelessly to a server. Transmission does not need to be reliable (ACK). The range would be between 50 and 100m, and may include ...
2
votes
1answer
232 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 ...
2
votes
1answer
73 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 ...
2
votes
1answer
246 views

rf24 change order of data

I'm using two Arduinos with the rf24 modules. I want to control a process with those, but for now I'm just checking the connection. This is the code of the master: #include <SPI.h> #include "...
2
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1answer
385 views

Module and library for self healing large sensor network

I have to build a wireless sensor network with arduinos on my project. It does not need to be a mesh network, but it needs to have self healing capabilities. I would like to use something cheaper ...
2
votes
1answer
186 views

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 ...
2
votes
1answer
317 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 ...
2
votes
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 ...
2
votes
1answer
722 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 ...
2
votes
2answers
2k views

RF 433 Module with VirtualWire: transmit and receive using the same Arduino board

I was wondering if it was possible to work, in the same Arduino board, both Transmitter and Receiver RF 433 MHz modules. Is it feasible? Here is the schematics I tried: 1) a pushbutton toggles a ...
2
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1answer
98 views

powering RF on GPIO

I have been running a simple RF link between 2 arduini uno recently and everything went faily well. I am now trying a new project with an arduino mini pro (5V/16MHz) and the seeeduino RF link (@315MHz)...
2
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2answers
15k views

nRF24L01+ (RF24) radio with Arduino Micro

I purchased several nRF24L01+ (RF24) radios to use with my Arduino Uno and Micro. Using the GettingStarted sketch and nRF24L01+ connected to my Uno, I get nice debugging info in my serial monitor. ...
2
votes
1answer
2k views

Auto acknowledge failed with nRF 24L01+ and Arduino [closed]

My transceivers are running fine. I've written a few code and got them running. Then I decided to check the auto acknowledgement feature wherein we can return data back to the sender WITHOUT manually ...
2
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0answers
40 views

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 ...
2
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0answers
1k views

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. ...
2
votes
0answers
878 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....
2
votes
0answers
277 views

Connecting Pulse Sensor to RFDuino Simblee

I am trying to make a heart rate sensor watch. I am trying to do this using a Simblee (www.simblee.com) and a Pulse Sensor (www.pulsesensor.com) however they will not work! The original code from ...
2
votes
2answers
650 views

Why is the nRF24L01 not working with Arduino Esplora?

I am working on a remote control car from an Arduino Esplora board and the Mega 2650 Board. My problem lies with the Esplora board as the nRF does not transmit like it is supposed to or does not even ...
2
votes
0answers
669 views

Is it possible to use the DASH7 protocol in an arduino?

I've been reading about the protocol DASH7 but can't find much documentation about it. There seems to be a protocol stack called OpenTag writen in C and I want to know if there is something familiar ...
1
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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: ...
1
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4answers
705 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 ...
1
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2answers
1k 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 ...
1
vote
2answers
6k 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 ...
1
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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,...
1
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1answer
83 views

RFduino communication capabilities

Is there any way to connect RFduino's via radio frequency? Or any capability to transmit information between RFduino's for distances up to 200 feet? I would like to purchase a dev kit (for RF duino) ...
1
vote
1answer
248 views

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 ...
1
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1answer
35 views

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 ...
1
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1answer
103 views

Can you use a RF remote with nRF24L01 and Arduino?

I recently bought a 10 pack of RF transceivers (nRF24L01). I wanted to know if its possible to pair one with an RC drone controller. I can't seem to find any ways to do this through google. If this ...
1
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1answer
978 views

Rc car controller using the RC-switch library

simulate this circuit – Schematic created using CircuitLab (Newbie in arduino) Hi so i have a project which involves creating an rc car which uses the 433Mhz rf module and an arduino nano with ...
1
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2answers
659 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 ...
1
vote
1answer
155 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'...
1
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1answer
179 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, ...
1
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1answer
3k views

Rc switch library transmit using protocol 5

I'm trying to transmit using mode 5 with the rc switch library, but my reciever tells me that the data is using protocol 2. I'm using the RecieveDemo_simple example as a sniffer for 433 MHz and I'm ...
1
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1answer
2k views

434 RF Transmitter and Receiver for distance measurement problem

As a student I'm working on a project where we use 434 MHz RF Transmitter and receiver pairs for distance measurement. I know that this technology is not a good choice for this, but we have to deal ...
1
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1answer
1k views

RF network using Arduino

I am working on home automation project. A network consists of one master device and many (maybe 10-20) slave devices, all communicating via these RF modules. I am using arduino in slave devices. ...
1
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3answers
755 views

NRF24L01 Direct Communication Library Logics

Actually I'm using the RF24 Library mantained by TMRh20 (https://github.com/TMRh20/RF24). I'm trying to get some type of direct communication between multiple modules working, but I don't want to use ...
1
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1answer
397 views

RF missing characters

I've got two arduino nano devices connected via RF 433 MHz. The modules are MX-05V and MX-FS-03V. I'm using VirtualWire for sending and receiving. The speed is set to 1000 bps. One has got a pir ...
1
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0answers
19 views

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. ...
1
vote
1answer
28 views

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 ...