RF link kit

Hello everyone,

Hope you can help me, please:)

I have bought this RF link kit(seeedstudio.com/depot/433mhz … th=139_140). When I want to send a message from an arduino(let’s call it “A”) to another arduino(“B”), everything is fine: the Arduino “A” send the message using the transmitter, and the Arduino “B” get it through the receiver. The problem is when I want to add the transmitter and the receiver on the same Arduino. For example, if I try to send a message by the transmitter on the Arduino “A” to the receiver always on the same Arduino, the message is sent, but it doesn’t receive it.

I use the Virtual Wire 1.9 library: open.com.au/mikem/arduino/VirtualWire.pdf

Any idea why?

Thank you so much!

Dear customer,

You said Arduino A send to B is OK. But why you ask always on the same Arduino?
Add the transmitter and the receiver on the same Arduino©? It is the one on the A and B?
Or you want to send massage then receiver by itself?

There shouldn’t too close to use with them. At least might be 30~100CM.

Hope can help you.

Best regards,

Yuri

Hi~
In my opinion , that’s impossible unless that you can send message and receive messgae simultaneously , mean that the send code and the receive code running in the same time . Others , if you are successful do that , please share the experience .

deray

Hi everyone,

First of all, thank you so much for your answers.

Yuri - Yes, I would like to add the transmitter and the receiver on the same Arduino©. They’re the same I use on the A and B. So that the Arduino C is able to send and receive.

Deeray - Unfortunately, I’m unsuccessful

However, I found a way (that suits my project) to avoid using the transmitter+receiver on the same Arduino; I simply add the transmitter to Arduino A, and the receiver to Arduino B. Unfortunately, I still have a problem: when I send a message(for example “hello”) from Arduino(A) to Arduino(B), the B get that: “68 65 6C 6C 6F” instead of “hello”. I suppose that’s the HEX code for “hello”, but any idea how to get the word “hello”?

Transmitter code:

const char *msg = "hello"; vw_send((uint8_t *)msg, strlen(msg)); delay(400);
Receiver code:

uint8_t buf[VW_MAX_MESSAGE_LEN]; uint8_t buflen = VW_MAX_MESSAGE_LEN; int i; for (i = 0; i < buflen; i++) { Serial.print(buf[i]); Serial.print(" "); }

Thank you very much again for your help.

What u r receive is right.
I wan to know what kind of the Serial Software you are using?
It show the HEX data I think it is the Serial Software’ problem,maybe your turn on the “show HEX” on the Serial Software.
So find that button and turn it off,that it will show “hello” correctly

Yeah, thank you very much, I added (char) before buf[i] and I get it as “hello”

for (i = 0; i < buflen; i++) { (char)buf[i]; }

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