Arduino to Raspberry serial connection via GPIO pins

I am yet again stuck on serial communications and in need of some help please.

The Plan

I am trying to send some data from an Arduino Nano to a Raspberry Pi Model B. I want to do this via the Tx pin on the Arduino and the Rx pin on the Raspberry.

What I have done so far:

• The serial tty setup and so has been done and I have been able to set up successful serial connection between 2 Raspberry Pis

• I have written a sketch for the Tx on the Arduino and the Rx on the Pi but I am not sure this is the correct way of doing it (well its obviously not because its not working)

Arduino Nano Tx Sketch

int iCount = 10000;
// ----------------------------------

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

void loop(){
  while(iCount < 30000){
    Serial.write(iCount);
    //Serial.flush(); // is this needed?
    //Serial.println(iCount); // should i rather use print than write?
    iCount = iCount + 1;

    if (iCount == 30000){
      iCount = 10000;
    }
  }
}

Questions - Arduino:

• Is this the right way of doing this?

• is the flush needed?

• should I rather be doing it with Serial.print? I didnt think this worked since the Tx LED did nothing with this meaning no Tx activity. Correct?

Raspberry Rx:

import Serial
oSer = serial.Serial("/dev/ttyAMA0")
oSer.baudrate = 9600

sSerialInput = oSer.read(6)
#sSerialInput = oSer.realine() # Is this the right way of doing it?
print sSerialInput

Questions RPi:

• given that I am sending a 6 digit number is the oSer.read(6) the right method?

• Should I rather use readline?

I am not sure where my error is, can anyone help sort this out with me please? Also I would like to send over a list at a later stage with 7 to 9 entries? how is this best done?