arduino TX to arduino RX problem

Other Hardware General Electronics
1

Hi
I have 2 arduinos
1 Mega and one duomilanove
have some problem in sending serial data ( arduino to arduino)
as sender I have the mega (TX) and reciber is the duemilanove (RX)

seems that I can not recibe the info

here is code for Sender

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

void loop()
{
  Serial.print('1', BYTE);
  delay(2000);

  Serial.print('0', BYTE);
  delay(2000);
}

CODE for reciber

#define LEDPIN  13
byte val;

void setup()
{
  pinMode (LEDPIN, OUTPUT);
  Serial.begin(9600);       
}

void loop()
{
  if (Serial.available()) {
    val = Serial.read();
    if (val == '1') {
      Serial.println("1");
      digitalWrite(LEDPIN, HIGH);
    } else if (val == '0') {
      Serial.println("0");
      digitalWrite(LEDPIN, LOW);
    }
  }
}
2

Have you connected the TX on the sender to the RX line on the receiver and connected the grounds together?

Next you need to put some debug print statements in the code to see:-
a) If you are receiving anything at all.
b) If so then what is it you are receiving.

3

big THANK YOU
mutual ground did the trick
:astonished: