FS1000A transmitter and MX-RM-5V receiver not working

Projects Networking, Protocols, and Devices
1

I'm new to Arduino development. I use Arduino Nano v3 ATmega328P (Old Bootloader). I assembled 2 small boards, one of which is a transmitter with three buttons, and the second is a receiver with three LEDs. But neither the receiver nor the transmitter work.

I tried to transmit signals to the transmitter with flipper zero at 433.92 and 433.88 MHz literally very close to the module, but it just doesn't see the signal and ignores it.

I also tried to receive signals from the FS1000A module on the flipper zero and through the MX-RM-5V module, but again, the flipper does not see the signal nearby even in Raw mode.

I read that for long-range operation of modules they need something like an antenna 69.23 / 4 ≈ 17.3 cm long, but as I know, the module itself should work at a distance of 15-20 cm without an additional antenna.

Can anyone tell me what's wrong and why the modules don't work? Can someone provide a working example code for the transmitter and receiver?

I used the code and wiring diagram from this article: Arduino и радио модули 433 МГц - Arduino набор GyverKIT

Transmitter:

#include <Gyver433.h>
Gyver433_TX<2> tx;

void setup() {
}

char data[] = "Hello from #xx";
byte count = 0;

void loop() {
  data[12] = (count / 10) + '0';
  data[13] = (count % 10) + '0';
  if (++count >= 100) count = 0;
  tx.sendData(data);
  delay(100);
}

Receiver:

#include <Gyver433.h>
Gyver433_RX<2, 20> rx;

void setup() {
  Serial.begin(9600);
  attachInterrupt(0, isr, CHANGE);
}

void isr() {
  rx.tickISR();
}

void loop() {
  if (rx.gotData()) {
    Serial.write(rx.buffer, rx.size);
    Serial.println();
  }
}

Scheme:

image
image1398×445 173 KB

2

Did you connect an antennas to the modules?

The Gyver site has a big forum, why not to ask there?

3

Your code and wiring doesn't match that.

Those modules are really cheap and especially that receiver is crap to my opinion.
Might be bad unit or you might have 315MHz version.
Try with this:

4

I have already tried the approach from this article. I'm pretty sure I have the 433mhz version.

5

No, but the articles don't say that it is necessary to do this. As far as I know, without an antenna, the transmission radius is about 15-20 cm.

It seems to me that the problem is with the modules, not with the code.

6

If you think that the code is not the problem and that the frequency of the module is correct,
what we have left? Incorrect wiring or non-working module.

7

Is the soldering the antenna too difficult to you? Doing that, you could increase the chances of connecting.

8

I tried to connect the antenna, but all was unsuccessful. I attached a photo of two schemes.

IMG_20250324_224939
IMG_20250324_2249391900×2533 568 KB

9

I connected the antennas, everything is the same.

10

Data pins don't match the code you posted.

1 Like
11

I'm already using another code from the article above with TX and RX pins.

Transmitter:

#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile

RH_ASK driver;

void setup()
{
    Serial.begin(9600);	  // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    const char *msg = "Hello World!";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(1000);
}

Receiver:

#include <RH_ASK.h>
#include <SPI.h> // Not actualy used but needed to compile

RH_ASK driver;

void setup()
{
    Serial.begin(9600);	// Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    uint8_t buf[12];
    uint8_t buflen = sizeof(buf);
    if (driver.recv(buf, &buflen)) // Non-blocking
    {
      int i;
      // Message with a good checksum received, dump it.
      Serial.print("Message: ");
      Serial.println((char*)buf);         
    }
}
12

I don't know what to suggest anymore...
Check the frequency written on the crystal of the transmitter.
Try again with flipper if it can detect it.
Buy new modules.
https://aliexpress.com/item/1005006153011303.html