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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Arduino 433MHZ transmit + receive on the same board

I have an arduino nano with the popular cheap 433Mhz receiver + transmitter on 2 different pins: http://www.instructables.com/id/RF-315433-MHz-Transmitter-receiver-Module-and-Ardu/ I would like to ...
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2answers
83 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?
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1answer
67 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 ...
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1answer
144 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 ...
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2answers
164 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 ...
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1answer
93 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 ...
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2answers
76 views

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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0answers
57 views

Understanding Rx-3304 Receiver Module

I've seen this circuit on the internet and I like to figure out how it works. According to manual: This is the radio frequency receiver module, which can facilitate the OEM designers to design their ...
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1answer
50 views

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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2answers
376 views

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 ...
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1answer
110 views

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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1answer
143 views

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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1answer
120 views

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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1answer
63 views

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 epcos ...
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2answers
102 views

433mhz radio reciever 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 ...
2
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0answers
117 views

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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1answer
65 views

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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1answer
1k views

How do I avoid interference in 433 MHZ RF transmission (in my case)

I suppose to do remote keyless entry (RKE) for door opening as a commercial product, there is DC motor which drive the door to open or close (receiver side), on transmitter side (remote) three button ...
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1answer
285 views

RF 433MHz - RXB12 vs XY-MK-5V

Anybody knows the difference between these RF receivers? I have a project and I am not able to work with RXB12. It is not receiving my transmitter.
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1answer
1k views

Why is 433 MHz used widely in RF modules?

I was planning to interface an RF module to my PIC16F877A microcontroller and was exploring the web. I came across many modules which use 433 MHz as the standard frequency. Why is it so? Can't we ...
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1answer
184 views

Multichannel RF transmitter design for 315MHz and 433MHz

first time designing RF, so pardon my ignorance. I want to design a ASK/OOK transmitter board operating on both 315Mhz and 433MHz ISM band frequencies. I have a MCU onboard that generates the data to ...
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1answer
116 views

Using 1/4 dipole antenna on RF module

Good day to you all. Am new to RF designs. Presently, am working on a device using RF module for transmitting my signal from TX to RX. Am using the common 315-433MHZ RF module bought from ebay. My ...
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2answers
149 views

How do I implement TDMA with basic 433 MHz transmitter receiver pairs?

Is it possible to use TDMA or some kind of time synchronization / pseudo random coding for a number of transmitters so that they can be interfaced with a single master receiver without jamming?
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1answer
355 views

How to interface multiple RF transmitters with single RF reciever?

How do I receive multiple signals simultaneously at a single receiver (433MHz) with multiple transmitters ? I am working on a polling system. This one is similar to the audience poll system using ...
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2answers
2k views

Using 433 MHz Tx/Rx without encoders/decoders

I want to use Tx & Rx Modules of 433 MHz standard modules you find everywhere. I just want Tx module powered up and Rx module should respond (probably key press) on Tx module. I don't have any ...
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2answers
3k views

RF Receiver for 433mhz and 315mhz?

I have a XD-RF-5V receiver wired to my Raspberry Pi listening with RFSniffer (433Utils). I also have a XD-FST 433.92mhz transmitter wired to my Raspberry Pi running codesend (433Utils). I can ...
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2answers
242 views

433 Mhz + Attiny85 improve range

I want to send information from my Attiny85 to my Raspberry. For the moment. Attiny and Emitter work on 5V Emitter have a 433 Mhz 1/2 waveform antenna I'am using virtual wire Raspberry receiver work ...
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2answers
369 views

433mhz micro directional antenna design

I'm trying to build a Radio wave penetration device that register the RSSI on the RX module. There are two 433 transceivers one is the RX and the other TX - I want to place between them different ...
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1answer
334 views

433Mhz Receiver Low Range Only on Raspberry Pi

I have an Arduino mini pro with a 433mhz receiver attached. I connected this to my computer via a usb to serial cable. I've tried it on two laptops ans it works fine with it (>15 metres), but when ...
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1answer
238 views

13MHz ISM band vs 433MHz ISM band

Would 14 MHz ISM Worldwide band have superior range and penetration (equal tx power)capability than the 433 MHz band? In that case, why aren't any transceivers made for this band? My application is ...
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0answers
93 views

Sub-1 GHz Narrow Band vs Wide Band

As per the TI document I came across which compares narrow band sub-1 usage vs wide band sub-1 usage mentions a concept called coding gain and its disadvantages. Because of my lack of understanding ...
0
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1answer
46 views

Wifi Channel vs a Sub 1 GHz channel of same width

If the same channel-width is allocated for a WiFi channel and also for a Sub-1 GHz channel, would the maximum allowable speed be the same for both channels theoretically? If they differ, what is the ...
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1answer
165 views

channel seperated communication in RF

In RF communication the carriers such as 950MHz, 133MHz are available under 1 GHz. If there are 50 devices using the for example 433MHz carrier, then how could large number of devices talk to each ...
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2answers
321 views

How does this electronic wall switch work with only a 2 wire circuit.

This is an RF wall switch but it uses only LIVE + LOAD1 cables like in the wall lamp switch (2 wires wall switch, load and live) If you short LIVE and LOAD the lamp turns on LIVE ...
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2answers
93 views

Antenna efficiency and PCB impact

I'm trying to improve the range on my 433 MHz radios and came across http://www.att.com/edo/en_US/pdf/AntennaFundamentals.pdf. (Geez, there's so much RF information in many bits and pieces, if only ...
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1answer
137 views

Improving RF sensitivity

I'm trying to improve the range on my 433 MHz radios that are using the CC430F5137. Based on 25.3.3 in http://www.ti.com/lit/ug/slau259e/slau259e.pdf, it seems like decreasing the RX filter BW can ...
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4answers
7k views

Wireless Home Automation 2.4GHz versus 433MHz [closed]

Project specifications To make some things clear first(wow that sounds so arrogant): This is an Arduino project This is supposed to be internationally applicable I have experience with 433 MHz ...
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3answers
5k views

What will it take to build a DIY 2km (city conditions) RF transmitter (433Mhz)?

This is my first question on this site. I am not an electronics/electrical engineer so pardon my depth of knowledge. I am trying to build an RF transmitter/receiver. These are my end goals : a text ...
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1answer
139 views

Two different length antennas can cause problems?

I am using two 443 MHz transceivers (FY-605 transceiver) with both having different antenna lengths. One antenna is around 12cm long and the other antenna is around 17cm long. Will this cause ...
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3answers
12k views

433MHz quarter-wave length antenna: longer is better?

I am trying to conduct an RF project using XY-MK-5V / XY-FS modules: link here My problem is that even though most blogs and Google searches for these modules use a quarter-wave length antenna ...
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1answer
613 views

Arduino 433MHz transmission fails if falling edge is less than 122ms

I am trying to control a LED using a high-power 433MHz transmitter receiver pair, with transmitter connected to my Arduino Nano. Here is the transmitter (XLPCF20): ...
3
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3answers
626 views

Boost DC voltage converter for wireless temperature sensor (1.5V to 5V)

I'm trying to design a wireless temperature sensor powered by one (or maybe two) rechargeable NiMH AA cell(s). The sensor should read and transmit the temperature every couple of seconds and remain in ...
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1answer
481 views

Cloning Keeloq remote keyless entry system

Our house and a few other share the same gate, which is opened remotely by a 433Mhz transmitter. Unfortunately, we only get one remote per house, and we have two car. The company operating the gate ...
3
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2answers
976 views

433MHz RF transmission only working when holding usb cable in the air

I'm really puzzled about this. I have a simple transmission between two ATTiny85's going on with a 433MHz receiver and transmitter. The transmitter is in the basement so the signal is rather weak but ...
5
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2answers
2k views

Attiny85 hardware interrupt unreliable, 433 MHz remote

SCROLL DOWN TO SEE THE SOLUTION (UPDATE II) ORIGINAL POST: I am currently building a 433MHz remote with two buttons. The remote is controlled by an Attiny85v(8MHz). Sadly it does not work very ...
2
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3answers
19k views

Boost 433MHz receiver module receiving signal (XY-MK-5V)

I am using some "no-name" (In Fact "XY-MK-5V" stands on the board) 433MHz receiver (and transmitter) on an Arduino project. I can receive the signals sent from my other Arduino very good (it sends ...
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4answers
7k views

More transmit power for 433MHz transmitter module by increasing voltage

I am using these 433MHz modules. According to the product information, I can supply the transmitter from 3-12 Volts. I am sending the data from an arduino (5V data) and want to power the transmitter ...
2
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1answer
515 views

433MHz sender/receiver modules share antenna

I am using a sender and a receiver for the 433MHz band, looking like these. Is it possible to share the send and receive antenna and attach one good instead of two wire antennas?
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2answers
512 views

Thermostat bypass wiring [closed]

I'm trying to bypass the heaters thermostat of my apartment and having only a small knowledge of electronics I would like to have a some help with it. Forgive me for the ugly paint schema but I ...
3
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1answer
6k views

How to check a 433Mhz module on an Arduino

I am new to arduino and electronics so please bear with me :) I would like to build a 433 MHz receiver which output I would later feed to a RPi (that will be the easier part for me). I bought a set ...