Values to 2nd Arduino

Projects General Guidance
1

I'm looking at sending sensor values to another arduino using either the serial or i2c. Basically the keypad sets a value, then the sensor counts from that value. I want those counted values (v1 in the code) sent to another arduinos serial monitor. I've played around with both a little bit but to no avail.

#include <Keypad.h>

int pirPin = 10; //Sensor code
int counter = 0;//Sensor code
int laststate = HIGH; //Sensor code
int num = 0;

const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'}
};
byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the keypad
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){
  Serial.begin(9600);
  pinMode(pirPin,INPUT_PULLUP); //Sensor code
}

void loop()
{
  int v1 = GetNumber();
  while (v1 > 0 )
  {
  int state = digitalRead(pirPin);
  if (laststate == LOW && state == HIGH) // only count on a LOW-> HIGH transition
  {
     v1--;
     Serial.println(v1);
  }
  laststate = state;  // remember last state
}
}


int GetNumber()
{
   char key = kpd.getKey();
   while(key != '#')
   {
      switch (key)
      {            
         case '0': case '1': case '2': case '3': case '4':
         case '5': case '6': case '7': case '8': case '9':
            Serial.print(key);
            num = num * 10 + (key - '0');
            break;

         case '*':
            num = 0;
            break;
      }

      key = kpd.getKey();
   }
   return num;
}
2

Serial test code that has one arduino receive something from the serial monitor, and then echo the info to another arduino, which displays the info on its serial monitor.

//zoomkat 3-5-12 simple delimited ',' string tx/rx 
//from serial port input (via serial monitor)
//and print result out serial port
//Connect the sending arduino rx pin to the receiving arduino rx pin. 
//Connect the arduino grounds together. 
//What is sent to the tx arduino is received on the rx arduino.
//Open serial monitor on both arduinos to test

String readString;

void setup() {
  Serial.begin(9600);
  Serial.println("serial delimit test 1.0"); // so I can keep track of what is loaded
}

void loop() {

  //expect a string like wer,qwe rty,123 456,hyre kjhg,
  //or like hello world,who are you?,bye!,

  if (Serial.available())  {
    char c = Serial.read();  //gets one byte from serial buffer
    if (c == ',') {
      if (readString.length() >1) {
        Serial.print(readString); //prints string to serial port out
        Serial.println(','); //prints delimiting ","
        //do stuff with the captured readString 
        readString=""; //clears variable for new input
      }
    }  
    else {     
      readString += c; //makes the string readString
    }
  }
}