Comments on: Complete Guide for RF 433MHz Transmitter/Receiver Module With Arduino

By: Sara Santos

Sara Santos — Sat, 26 Apr 2025 10:47:00 +0000

In reply to Alan Fairclough.

Hi.
Double-check the connections.
If it still doesn’t work, you may need to get a new module.
Regards,
Sara

By: Alan Fairclough

Alan Fairclough — Fri, 25 Apr 2025 18:28:15 +0000

I have tried for weeks but can’t get this receiver to work.
What is the int i; for?
Nobody seems to know,

By: Sara Santos

Sara Santos — Wed, 17 Jul 2024 15:47:48 +0000

In reply to Guilherme.

Olá.
Não testei nessa placa.
Cumprimentos,
Sara Santos

By: Guilherme

Guilherme — Wed, 10 Jul 2024 13:44:56 +0000

Bom dia.
Acabei de descobrir este tutorial e achei muito interessante.
Gostaria de saber se ele funciona bem com Attiny85.
Aguardo contato.
Obrigado

By: David

David — Fri, 22 Dec 2023 15:32:40 +0000

In reply to carl byington. Thanks Carl! That solved the problem.

By: carl byington

carl byington — Thu, 21 Dec 2023 23:16:20 +0000

In reply to David. Failure to null terminate the println string. See my December 1st post above.

By: carl byington

carl byington — Thu, 21 Dec 2023 23:02:18 +0000

In reply to David. See my post above on December 1st. Failure to null terminate the println string.

By: David

David — Thu, 21 Dec 2023 16:02:09 +0000

I do receive the “Hello World!” message in the serial monitor but it is followed by a series of characters that continue for several seconds before the next HW message displays.

Message: Hello World! 2UUUUUUUUUUUUUUUUUUUUUUUIUUUUUUUU…
Message: Hello World! 2UUUUUUUUUUUUUUUUUUUUUUUULUUUUUU….
Message: Hello World! 2UUUUUUUUUUUUUUFUUUUUUUUUUUUIUUUU…

The transmitter is a TWS-434a on a Nano and a RWS-434 RF receiver on a 1208 Mega.
Any thoughts?

By: Dave Cross

Dave Cross — Tue, 19 Dec 2023 15:56:48 +0000

First of all, thanks for all the very well documented projects!

I have set up the transmitter on a Nano and receiver on a Mega 1280. When transmitting the receiver serial monitor display the expected message but also continues to print mostliy “U” until the line fills then starts again.

Message: Hello World! 2UUUUUUUUUUUUUUUUUUUUUUIUUUUUUUUUUUU…
Message: Hello World! 2UUUUUUUUUUUUUUUUUUUUUUULUUUUUUUUUU…

The transmitter and receiver are a couple of TWS-434A and RWS-434 modules I have had for years. Any thoughts would be appreciated.

By: carl

carl — Fri, 01 Dec 2023 23:51:15 +0000

In reply to Mario.

Failure to null terminate the string. You can either send the null terminator over the rf channel (strlen(msg)+1), or add it on the receiver side as follows.

void loop()
{
uint8_t buf[20];
uint8_t buflen = sizeof(buf)-1;
if (driver.recv(buf, &buflen)) // Non-blocking
{
buf[buflen] = 0; // null terminate string
// Message with a good checksum received, dump it.
Serial.print(“Message: “);
Serial.println((char*)buf);
}
}