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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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53 views

Is it possible to replicate a Novotron 522 remote control?

The signal I want to replicate is to open/close a garage door, operated by a Novoferm motor. The remote control used is a Novotron 522. The description states this is 2-channel remote control, ...
0
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2answers
76 views

Can I use the same antenna for GSM and RF433 MHz?

I've already designed a PCB with GSM/GPRS chip and also with RF 433MHz receiver only (without transmitter). I would like to know if I can use the same antenna for both GSM/GPRS module and RF 433MHz ...
3
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0answers
45 views

Microphonic SAW transmitter?

I built this very simple SAW transmitter, with a simple "spring" antenna for the right frequency. To test it, I tuned a portable receiver to around 433.92Mhz and fine tuned it until I heard silence. ...
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0answers
31 views

Cheap RF 433.92MHz design, PCB track antenna [duplicate]

I'm doing a RF remote control project using a PCB with microcontroller and with simple onboard antenna layout as transmitter and a 433.92MHz receiver RWS-371F-6 model. Here is the datasheet of the ...
0
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1answer
99 views

RF Design / Calculations - 433.92MHz, PCB antenna, values of capacitors

I'm doing a RF remote control project using a PCB with microcontroller and with simple onboard antenna layout as transmitter and a 433.92MHz receiver RWS-371F-6 model. Here is the datasheet of the ...
0
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1answer
152 views

433Mhz Remote Control Antenna Selection

First I want to thank all of you who come here and help others. That is very kind and unselfish of you! This is lengthy but I want to make sure I tell you everything you need to know to answer this ...
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0answers
81 views

How does this transmitter work/how to tune it?

I have used a few 433MHz ASK transmitters. They're cheap, readily available, and work reasonably well. Based on this application note from Murata I tried to build my own. I replaced the NE68030 ...
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0answers
44 views

Antenna selection for CC1101-433 MHz rf

I intend to use these TI CC1101 433 MHz RF modules in one of my project: Wavelength of 433 MHz will be 69 cm. Half wavelength will be 34.5 cm. Vendor is selling two antenna options with the product. ...
0
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1answer
85 views

Easiest way to control a led remotely [closed]

I was wondering what is the easiest and cheapest way to have a high power led (3 Watt) turn on/off and blink remotely from a distance (60m-100m). I've been looking at some microcontroller solutions (...
0
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1answer
539 views

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. ...
0
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1answer
88 views

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 ...
0
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1answer
117 views

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 ...
4
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0answers
552 views

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 ...
0
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2answers
119 views

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 ...
1
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1answer
130 views

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 ...
2
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0answers
311 views

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 ...
0
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1answer
79 views

Door alarm to also notify about door closing

I have a set of PB-67R 433mhz transmitters that can be neatly attached to the doors or windows and send a signal when they're opened. Problem is that I'd also like to know when a window is closed, ...
1
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2answers
1k views

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 ...
0
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1answer
3k views

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 ...
3
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3answers
637 views

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 ...
1
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1answer
60 views

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 ...
0
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1answer
397 views

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 ...
0
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2answers
966 views

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 ...
1
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1answer
2k views

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 ...
1
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2answers
4k views

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 ...
3
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2answers
80 views

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. ...
0
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1answer
961 views

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 ...
0
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3answers
3k views

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 ...
4
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3answers
564 views

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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2answers
2k views

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 ...
0
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1answer
2k views

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 ...
0
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2answers
597 views

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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1answer
258 views

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 ...
2
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1answer
135 views

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 ...
0
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1answer
189 views

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 ...
2
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1answer
109 views

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 ...
0
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2answers
823 views

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 ...
0
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2answers
78 views

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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0answers
145 views

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 ...
0
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1answer
221 views

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 ...
0
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1answer
70 views

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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1answer
571 views

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 ...
5
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2answers
6k views

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 ...
0
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3answers
620 views

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 ...
0
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1answer
2k views

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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2answers
1k views

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?
0
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1answer
414 views

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 ...
2
votes
1answer
4k views

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 ...
2
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2answers
7k views

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 ...
0
votes
1answer
473 views

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 ...