The goal of this part of my project is to establish a wireless connection between an Arduino nano and an Arduino uno. For this I use 433 MHZ receiver and sender. The nano sends, the uno receives and prints. I have working code and the connection works and I can send, receive and print my message. But at some point the Uno receives just a part of the message and after this point always receives (or prints) just this part of the message:
Nano (sender):
#include <VirtualWire.h>
char *msg = "123456789123456789";
It is not always 2 digits, sometimes more are received.
I searched for errors. The nano is constantly sending and the uno flips to not receiving the whole message. So I reupload the code to the uno without modification and it works again for a few seconds/minutes, so I guess it's a problem at the receiving end.
Here is my code:
Sender(nano):
#include <VirtualWire.h>
char *msg = "123456789123456789"
void setup() {
Serial.begin(9600);
pinMode(7,OUTPUT);
pinMode(5,OUTPUT);
digitalWrite(5,LOW); //GND
pinMode(6,OUTPUT)
digitalWrite(6,HIGH); //5V
vw_setup(5000);
vw_set_tx_pin(7);
}
void loop() {
vw_send((uint8_t*)msg, strlen(msg));
vw_wait_tx();
delay(500);
}
Receiver(Uno):
#include <VirtualWire.h>
int i;
uint8_t buf[VW_MAX_MESSAGE_LEN];
uint8_t buflen = VW_MAX_MESSAGE_LEN;
void setup() {
Serial.begin(9600);
pinMode(5,INPUT);
pinMode(6,INPUT); // two data inputs, we use just one
pinMode(7,OUTPUT);
digitalWrite(7,LOW); //GND
pinMode(4,OUTPUT);
digitalWrite(4,HIGH); // 5V VCC
vw_setup(5000);
vw_set_rx_pin(6);
vw_rx_start();
Serial.println("Starting up");
}
void loop() {
if(vw_get_message(buf,&buflen)) {
for(i=0;i<buflen; i++) {
Serial.print((char)buf[i]);
}
}
}
It doesn't happen after a certain time or number of messages. I have no clue what could be the problem.
Thanks in advance, Niklas
Edit: Problem seems solved. Changing bitrate from 5000 to 2000 solved the problem, but I don't actually know why.