Questions tagged [433mhz]
433MHz is a license-free area of the RF spectrum in many countries. It tends to be restricted to low power and bandwidth but allows simple modulation schemes making it popular for low cost / bandwidth applications such as keyless entry and alarm systems.
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what is the good antena length for 433Mhz modules used for low distance domestic usage?
I want to use a low cost 433Mhz module for low distance domestic usage, but I need to solder an antenna , (there is a place for that on the reception module), to get a better signal across my walls. ...
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Signal loss failsafe for a cheap drone using 433 MHz tx/rx pair
I bought a cheap drone to get into flying quadcopters and it seems it has only one big issue at that price, which is a very long failsafe time of 20 seconds, i.e. if the remote signal is lost, the ...
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Creating a wireless transmitter/receiver for off-the-shelf siren
Since I oddly enough haven't been able to find a suitable off-the-shelf product that's reasonable priced (less than 50-60 EUR/USD) and somewhat good looking with Google, I'm about to try a small ...
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How to analyze/decode a Manchester encoding? [closed]
I have a barcode scanner working on 433Mhz (FSK). Since this is a relatively old product and the PC software is not working with Windows 10's and I can't use the SDK anymore. I, therefore, have ...
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How to derive voltage applied to an antenna, where transmitter power is known & identical tx/rx antennas are used with known gain/impedance?
Question:
Imagine a transmitter + transmitter antenna with the following characteristics:
433Mhz transmitter transmitting 10dBm
Into an impedance matched (50 ohms) antenna, omni-directional, 3dBi ...
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Fast, cheap, wireless data transmission with Raspberry Pi [closed]
I need some advice on a project.
I want to wirelessly transmit packets of data from a Raspberry Pi to several microcontrollers (Arduino or other). The frequency must be at least 15 packets/s per ...
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A curious 433 MHz signal to decode
I bought a cheap set of remote controlled power sockets and I want to integrate them into my home automation system. So I got a 433 MHz receiver for 1€, connected it to my Arduino and tried to decode ...
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Why are two different length antenna sold with this 433MHz module?
I've stumbled upon this module. It is a set of receiver and transmitter module at 433MHz.
This shows the antennas:
With the lengths being given as:
"external antenna: 25cm ordinary multi-core or ...
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How can I modify the frequency of a simple 433MHz transmitter module?
How can I change the frequency of a simple RF transmitter?
These are the transmitters in question:
Background Research
On this question s3c says:
To change the ...
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Servo interfering with 433MHz RF
I'm using an Atmega328P running at 16Mhz (similar to an Arduino UNO). to control a 433Mhz Superheterodyne RF receiver (WL101-541) and two TowerPro SG90 analog servos.
Everything is working except for ...
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CC110L strange clock signal
I'm trying to hack my wireless thermostat to control my heating. I disassembled my unit and found the communication chip ( CC110L - SPI 433MHz). I searched for the datasheet and tried to determine ...
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where to solder antenna on 433 MHz remote control
I would like to install this remote into a carbon component, which apparently shields all rf signals.
So, I need to solder an external antenna to this remote control pcb, but I could not figure out ...
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Using cheap RF module encoding with UART in a commercial product
For my graduation project, I need to design a system that transmits several different data packets to the computer wirelessly. It needs to have a potential to be commercial product, so both functional ...
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Test circuit to confirm RF receiver frequency? (315Mhz vs 433Mhz)
I've bought a 433 Mhz Transmitter/Receiver pair, or so I think. I cannot make them work, and I started to think that maybe the seller sent me a 315Mhz transmitter / 433 receiver pair by mistake (I've ...
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Datasheet/screw function on XY-MK-5V 433 MHz receiver?
I cannot find a datasheet for my 433 MHz receiver (which seems to be a XY-MK-5V), which looks like this:
Also, I was wondering what is the use of the screw (on top of the green box with copper wire ...
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Unexpected bits when shifting out (ATtiny85)
I'm trying to spoof a 433 MHz remote and I have a sequence of 32 bytes that I want to repeatedly shift out to one of ATtiny85's pins. The signal then goes to a cheap Chinese-type 433 Mhz transmitter.
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Duplicating a KeeLoq Remote Control
I have been reading the documentations about KeeLoq Encoder and Decoders for some time. My goal is to build both the Transmitter side and the Receiver side using the KeeLoq system.
I almost completed ...
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Can a RF 433.92 Mhz transceiver communicate to a RF 433.42 Mhz Receiver?
I am working on automating my Somfy Blinds. The idea is to avoid using the remote control which works on 433.42 Mhz and use a simple RF transmitter and an Arduino.
The thing is that I can not find any ...
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433 MHz VS. Manhole Cover
I'm working on a sensor which purpose is to measure the water level of a sinkhole without getting in touch with the wastewater.
The Sensor is mounted beneath the manhole cover --> The underside is ...
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Clone garage door opener [closed]
I have a garage door opener that I got when I moved into my condo. However, I only have one, and we have three vehicles in total (1 car + 2 mopeds). I want to permanently have a garage door opener ...
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Noise presence at a 433Mhz receiver
I'm playing around with these 433Mhz transmitter and receiver modules in combination with and Arduino Uno.
I first soldered a 17cm long helical antenna to both modules. After I while I noticed that a ...
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What unlicensed frequencies can (or should) be used for proprietary wireless communication? [closed]
I can see that most of the gadgets that use proprietary protocols use 433MHz, 915MHz, or 2.45GHz, but I don't understand why. 433MHz is highly regulated in the US and 915MHz can not be used in Europe. ...
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rf range at 433Mhz with prototype stripboard
I have a pair of RF IC's, wired with capacitors and coils as suggested by the manufacturer, on a prototype vero-board. (see pictures).
These are an OOK 433MHz transmiter CMT2150 and a receiver CMT2250 ...
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Antenna design for radio energy emission into a fresh-water test tank
I would like to emit as much RF energy in the frequency range of 433.9 to 434.5 MHz into surrounding fresh water with a 100mW transceiver.
The antenna is in the middle of a 4mx8mx2m fresh-water tank ...
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RF module with noisy supply
Brief description of the context (not really necessary to answer):
I built a quadcopter. The motors (small DC motors) and the electronics are powered by a single 3.7-4.2v battery. To prevent the ...
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basic RF transission in noisy environment
I built a little quadcopter, and I need to transmit some data to it in a max. 4-5 meters range.
The transmitter needs to transmit in a quarter of a sphere (the quadcopter will newer be "behind" the ...
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How does a PC sound card be able to detect 433 MHz signals?
I have developed a radio driver that can detect sensor RF packets for a particular protocol, in 433 MHz band using a 433 MHz receiver module like this one and also similar to this one. Before I ...
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Are these 433Mhz receivers likely to be able to physically receive signal from this? [closed]
Does anyone know if the 433Mhz receiver boards like the ones I picture below are physically capable of receiving transmissions from These Trust wall switches?
I have both, and am willing to spend ...
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Procedure for cc430 rf tuning with chip antenna
I have designed the 433MHz RF PCB with CC430F5137 with ceramic 50 Ohm chip antenna from Johanson Technology. I have also used Balun from Johanson Technology to match the CC430 and 50Ohm Antenna. I ...
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Random signal lost or extreme weak signal with remote controller on ISM frequency (433Mhz)
There is a task given to me that I have to investigate a problematic RF remote controller against its weakness and make a suggestion report how it can be improved.
This RF remote controller is used ...
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LFCN-490, which direction?
From the data sheet of the LFCN-490 radio filter, the chip is marked with RF in, RF out and GND, but what is defined as RF in/out? I have seen some circuits using the rfm-22b with pin 1 (RF in) ...
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PIC to PIC 433 MHz RF Communication Fails [SOLVED]
I've got two PIC16F628A.
one for transmitter and one for receiver... (433 MHz)
I set B pins as input in order to use transmitter and receiver...
The codes are written in mikroC.
Here is the code for ...
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Design rf trace antenna 433MHz + 315MHz on pcb
I'm a hobbyist and I'm designing a PCB in Eagle that include micro controller and RF receiver and transmitter, 2 modules of 433mhz and 2 of 315mhz,
I have a defined place on the PCB of 10x50 mm for ...
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What do I need in order to make my arduino to transmit / recieve signals exactly at 433.68 MHZ?
Before I start, please note I am not even near to be an expert in electronics - I just try to do my best with what I have - I apologize in advance if my language is not technical enough.
I have a ...
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Interface of HC05 Bluetooth module and RF 433Mhz Module
I am trying to make an Android controlled toy car. Now the range of the bluetooth module is around 10 meters. However, to increase the range, I decided to interface the RF module with the Bluetooth (...
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Is it possible to transmitting video signal on 433MHz? [closed]
A video of 2MP or lesser at a distance of 2-3Km.
Is it possible to transmit it on 433MHz ISM band?
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Switching on Power to 433MHz chip
I have this 433 MHz transmitter attached to my Arduino 5v Vcc pin.
I asked this question so I could deliver 12v to the transmitter chip, effectively boosting the transmitted power output, allowing me ...
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My first RF Transmitter Circuit
I'm in the process of creating my first 433mhz RF transmitter with a PT2622 encoder & SAW Resonator. I included a portion of my schematic below that shows my PT2622.
Does my schematic look ...
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Increase range of 433MHz remote sensor [closed]
My question is similar to this one but with some differences.
I have wireless weather station with 3 remote 433MHz sensors so I cannot change the protocol and program the controllers. Also I'm new to ...
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Boosting power transmitted by 433MHz module from 5v to 12v
I have one of these transmitter modules attached to an Arduino Mega and currently powered by the Arduino Mega 5v pin.
I have locations that cannot receive the radio transmission because of lack of ...
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Should I use an LP2953 to power an ATTiny85 with a 12v battery?
Like a lot of people I'm building a little transmitter unit with one of those cheap 433mhz transmitters and an ATTiny85, and I am having a problem with the power supply. Actually it is only the power ...
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Texas instruments C1101 RF1100 module Schematics
does anyone got schematic from this module. I tried searching around but didn't get anything except main header pin-out. There are also 2x2 pin on each corner, but there is no info about them.
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How to decode this 433MHz RF signal?
I'm receiving this RF signal from a temperature only weather station transmitter. But i can't figure out what encoding is being used.
I can't seem to decode the binary. In order to rule out noise or ...
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does having encoder/decoders in 433MHz rf links improve range and reduce noise?
with the use of encoders and decoders I'm able to interface more than one RF link pair at the same time, this is what the usage of an encoder looks like to me.
Are there more uses to it than this?
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433 Mhz Receiver with stm32f4
How do I receive data with my stm32f4 board with a classic 433 Mhz receiver?
Arduino and Raspberry have their libraries to do such a thing. Do I have to implement it myself?
If yes, how do I do that?
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What frequency is this remote using? [closed]
I have a garage remote control I'm trying to duplicate, but the 433Mhz cloner I bought isn't responding to it.
Can anyone please confirm my remote is using 433Mhz frequency based on this circuit board ...
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Oscillating Amplifier
I am attempting to build the following amplifier
The amps used are MAR-8A+'s from minicircuits
C1, C2, C3, L1 - while these are available on the board they have not been placed
The filters are ...
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433mhz radio receiver non demodulating [closed]
I am currently working on a direction finder project for rf signals. I am attempting to use a phase detector chip to compare phases and calculate the direction. The main problem I am experiencing atm ...
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433.92 Noise Is Different Across The Same Type Of Devices
I have two 433.92 RF receivers of type XY-MK-5V and one of type RXB12 . The question that brings we here is this:
Lets give the receivers names:
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how remote key of popular car brand working wide range?
i did remote control for garage opener with cheap module supply with 3v coin cell battey,i got 30-40 meter range by spiral type antenna setup and got 80 meter range wipe type antenna setup. i ...
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