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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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44 views

HC12 Serial RF Transceiver with PIC16F886 Microcontroller

I'm trying to do a wireless communication between two PIC microcontrollers (PIC16F886) using the TX/RX lines using HC-12 RF transceiver modules (datasheet link below). https://statics3.seeedstudio....
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28 views

CI HT12E enable control to reduce power consumption

So, following this datasheet (check out Application Circuit 4), I managed to transmit a signal and receive it on the other end. The thing now is: the whole circuit is drawing 2 mA, and that is because ...
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47 views

Unable to intercept the code of my remote control at 433 MHz with RaspberryPi

I'm trying to reproduce the code generated by my universal 4-channel radio control with ...
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3answers
133 views

2.4GHz WiFi module causing interference on 433MHz RF receiver module

I have a prototype board which has two RF modules on it, a 2.4GHz Wifi module (ESP-01) and a low cost 433.92MHz RF receiver module (Wenshing RWS-371F-6). My 433MHz transmitter (a remote control) sends ...
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1answer
62 views

How does this 433Mhz garage remote control work without an antenna?

I have a 433 Mhz garage remote control that works very well even from 30 to 50 meters and it has no antenna! How is it possible that it works so well without an antenna? Also, given the picture of ...
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2answers
74 views

Does the 433 MHz transmitter/receiver, transmit the voltage?

The title, says it all... I would like to know if the 433 MHz transmitter/receiver (couldn't find a datasheet, here is all I found on it) transmits the voltage, ...
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3answers
156 views

I2C noise from 433MHz transmitter

I have built a little thermostat based on BMP280 temperature sensor over I2C, ESP8266 Lolin v3 and STX882 433Mhz transmitter. I have not added additional pull-up resistors or decoupling capacitors. ...
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1answer
30 views

Antenna Gain Vs IP68 plastic enclossure

I would like to buy this IP68 plastic enclossure below for my electronic project: https://www.chinaenclosure.com/products/102-70-52mm-ip68-waterproof-plastic-enclosures-for-electronics-from-china-...
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1answer
212 views

Itead Sonoff RF WiFi & 433MHz switch: Identifying an unknown chip on the 433MHz card

I have the Sonoff RF which is a mains relay switch which is activated by either WiFi or a 433MHz remote. The particular Sonoff RF's I have arrived from China on 21/9/2017. I flashed these Sonoff RF's ...
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2answers
96 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, ...
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2answers
133 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 ...
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51 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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44 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 ...
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2answers
246 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 ...
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1answer
408 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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168 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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99 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. ...
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1answer
88 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 (...
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945 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. ...
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1answer
112 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 ...
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1answer
223 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 ...
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820 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 ...
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2answers
240 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 ...
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1answer
167 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 ...
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437 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 ...
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1answer
110 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, ...
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2answers
2k 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 ...
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1answer
5k 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 ...
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3answers
776 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 ...
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1answer
70 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 ...
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1answer
519 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 ...
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2answers
1k 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 ...
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1answer
3k 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 ...
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2answers
5k 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 ...
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2answers
82 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. ...
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1answer
1k 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 ...
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4answers
4k 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 ...
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3answers
601 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
3k 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 ...
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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 ...
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2answers
824 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
300 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 ...
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1answer
153 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 ...
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1answer
217 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 ...
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2answers
145 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 ...
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2answers
955 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 ...
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2answers
80 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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164 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 ...
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1answer
250 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 ...
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1answer
72 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) ...