[SOLVED] 3 more i2c pins and communication code for arduino needed

Code C - [expand]
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#include "Wire.h"
#define PCF8591 0x90 >> 1
void setup()
{
Wire.begin();
Serial.begin(9600);
}
int val=0;
void loop()
{
if (Serial.available()) {
val = Serial.read();
}
//for (int i=0; i<256; i++)
//{
Wire.beginTransmission(PCF8591); // wake up PCF8591
Wire.write(0x40); // control byte - turn on DAC (binary 1000000)
Wire.write(val); // value to send to DAC
Wire.endTransmission(); // end tranmission
//val=val+1;
//}
/*for (int i=255; i>=0; --i)
{
Wire.beginTransmission(PCF8591); // wake up PCF8591
Wire.write(0x40); // control byte - turn on DAC (binary 1000000)
Wire.write(i); // value to send to DAC
Wire.endTransmission(); // end tranmission
}*/
}