Cap sensor

//----------------------------------------------------------------------------------------
//|     AD7747 Capacitive Sensor                                                         |
//|   Based on code by  MiG found at:http://forum.arduino.cc/index.php/topic,11882.0.html|                                           |
//|                                                                                      |
//|  Author: Aidan Williamson (although I didn't do much original work)                  |
//|  Written: 7/3/2014                                                                   |
//|  ad7747 datasheet:http://www.analog.com/static/imported-files/data_sheets/AD7747.pdf |
//|                                                                                      |
//|                                                                                      |
//|                                                                                      |
//|                                                                                      |
//-----------------------------------------------------------------------------------------
#include <Wire.h> //include the library for i2c communication


int ready = 78; //ready pin will go low when conversion is complete

void setup()
{
  pinMode(ready, INPUT);  //we will read the ready bit from pin 2
  Wire.begin(); //sets up i2c for operation
  Serial.begin(9600); // we will monitor this via serial cable
  Wire.beginTransmission(0x48); // begins write cycle
  Wire.write(0x07);  //address pointer for cap setup register
  Wire.write(0xA0);  //b'10100000' found from datasheet page 16
  Wire.endTransmission(); //ends write cycle
  delay(4);// Wait for data to clock out? I'm not 100% sure why this delay is here (or why it's 4ms)
  Wire.beginTransmission(0x48);//begins transmission again
  Wire.write(0x09);  //address pointer for capacitive channel excitation register
  Wire.write(0x0F);  //This will vary depending on your setup. See page 17 of datasheet
  Wire.endTransmission();
  delay(4);
  Wire.beginTransmission(0x48);
  Wire.write(0x0A);  //address pointer for the configuration register
  Wire.write(0xA1);      //b'00011001' for continuous conversion, arbitrary VTF setting, and mid-range capacitive conversion time
  Wire.endTransmission();
}

void loop() //set up for reading and transmitting data
{
  int ready = digitalRead(ready); //sets up ready pin as digital input

    while (ready ==HIGH)  //use digital pin 22 as interrupt pin
    {
      delay(1);//why not
    }; //do nothing at all!
    Wire.beginTransmission(0x48); //arduino asks for data from ad7747
    Wire.write(0x01);  //set address point to capacitive DAC register 1
    Wire.endTransmission(); //pointer is set so now we can read the data
    Wire.requestFrom(0x48,3); //reads data from cap DAC registers 1-3
    while(Wire.available())
   {
     char capacitance = Wire.read();
     Serial.print(capacitance, DEC); //prints the capacitance data in decimal through serial port
     Serial.print(",");
   }
     Serial.println();
}