Arduino Serial Connection

Projects General Guidance
3

I tried developing this receiver code which initially outputs data for like the first two values and then just outputs zero:

//Receiver Code

char str[4];

void setup() {
Serial.begin(9600);

}

void loop() {
int i;

Serial.readBytes(str,4);

i= atoi(str);
Serial.println(i);
delay(500);
}

I also tried printing the character directly but this resulted in weird characters being displayed in the serial monitor:

//Receiver Code

char str[4];

void setup() {
Serial.begin(9600);

}

void loop() {
int i;

Serial.readBytes(str,4);

Serial.println(str);
delay(500);
}