433 MHz Receiver doesnt work

Other Hardware General Electronics
1

Hello everyone
I have ordered a 433 MHz receiver + transmitter module.
When reading the signals from two 433 MHz remote controls, my Arduino does not display any read codes. Once, after several hours of trial and error, I had intercepted two signals. I installed the RC Switch library and also used the sample code.
I have the following modules:
https://www.amazon.de/BQLZR-433Mhz-Wireless-Transmitter-Empf%C3%A4ngermodul/dp/B00EQ1U5XQ/ref=sr_1_1?dib=eyJ2IjoiMSJ9.Laxqcq8YUGz9hNuYhQwg2ymkVMuFg0EXrBwhDQmQCCw2PKHTqBtY7saJI6SfNyVu6c2o7G2k4-AB87a8FcrAOk3btKHtuTt1RJUWv3JdM4TvNUwJutDSVsdLfu2C5mnwmWz_yRo-CVYMiMvmGyy6tFcKJv-wrhgGLTInowXN4pN2IA5Avy27oV3VBCVwqmOHvEB2FOb9jQfWgfbKNmO0W06RKd3C9dbxorXMuQy3yNr2TxYHIdL8jb4C3-COragnQTUN2Dcc9pg10JVDRqUq_Uiapaf_IUSpgLpxQP93Qj4.s2snv3SLHzxeEgfVVCoETC2Yye4Ra_cxP-dxLS2eb9Y&dib_tag=se&keywords=BQLZR+1+Set+433Mhz+Transmitter+and+Receiver%C3%A4ngermodule+Gr%C3%BCn+PCB&qid=1709670344&sr=8-1))

I have connected as follows:
VCC to 5 V
GND to GND
RXD to pin2

2

Please post the sketch you are trying to make work.

Are you first using a n example circuit and code that you did not alter in any way? With a device new to you, this is the easiest way to start getting to know it and how it works and is used in the code.

a7

3

Is there a reason to believe that the remote controls use the RCSwitch protocol, of the many possibilities?

This tutorial shows a general method to determine what the transmitters are actually sending, without making any assumptions: Reverse Engineer Wireless Temperature / Humidity / Rain Sensors — Part 1 « RAYSHOBBY.NET

4

I used the original example code from RCSwitch.

#include <RCSwitch.h>

RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(9600);
  mySwitch.enableReceive(0);  // Receiver on interrupt 0 => that is pin #2
}

void loop() {
  if (mySwitch.available()) {
    
    Serial.print("Received ");
    Serial.print( mySwitch.getReceivedValue() );
    Serial.print(" / ");
    Serial.print( mySwitch.getReceivedBitlength() );
    Serial.print("bit ");
    Serial.print("Protocol: ");
    Serial.println( mySwitch.getReceivedProtocol() );

    mySwitch.resetAvailable();
  }
}
5

If the protocol is not RCSwitch, then that example will not work, or do anything useful.

6

Hello, your post popped up as I was closing my own question about 433MHz modules. I think there is much misunderstanding about these devices. I now have some experience of using them. Feel free to ask if you are still having problems.