#include "Wire.h"
#include "math.h"
#define PCF8591 (0x90 >> 1) // I2C bus address
float sinval = 0;
int SigVal = 0;

int SinLUT [] = {0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,
0x98,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,
0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,
0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,
0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,
0xea,0xeb,0xed,0xef,0xf0,0xf2,0xf3,0xf4,
0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfb,0xfc,
0xfd,0xfd,0xfe,0xfe,0xfe,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xfe,0xfe,0xfd,0xfd,
0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,
0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xeb,
0xe9,0xe7,0xe5,0xe3,0xe1,0xdf,0xdd,0xdb,
0xd9,0xd7,0xd4,0xd2,0xcf,0xcd,0xca,0xc8,
0xc5,0xc3,0xc0,0xbd,0xba,0xb8,0xb5,0xb2,
0xaf,0xac,0xa9,0xa6,0xa3,0xa0,0x9d,0x9a,
0x97,0x94,0x91,0x8e,0x8a,0x87,0x84,0x81,
0x7e,0x7b,0x78,0x75,0x71,0x6e,0x6b,0x68,
0x65,0x62,0x5f,0x5c,0x59,0x56,0x53,0x50,
0x4d,0x4a,0x47,0x45,0x42,0x3f,0x3c,0x3a,
0x37,0x35,0x32,0x30,0x2d,0x2b,0x28,0x26,
0x24,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,
0x14,0x13,0x11,0x10,0xe,0xd,0xb,0xa,
0x9,0x8,0x7,0x6,0x5,0x4,0x3,0x3,
0x2,0x2,0x1,0x1,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x1,0x1,0x1,0x2,0x2,
0x3,0x4,0x4,0x5,0x6,0x7,0x8,0x9,
0xb,0xc,0xd,0xf,0x10,0x12,0x14,0x15,
0x17,0x19,0x1b,0x1d,0x1f,0x21,0x23,0x25,
0x27,0x2a,0x2c,0x2e,0x31,0x33,0x36,0x38,
0x3b,0x3e,0x40,0x43,0x46,0x49,0x4c,0x4f,
0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,0x67,
0x6a,0x6d,0x70,0x73,0x76,0x79,0x7c,0x80};


void setup()
{
//wire.setClock(400000L);
 Wire.begin();
}
void loop()
{
 for (int i=0; i<255; 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
//sinval = (255*sin(radians(2*3.14))); 
//sinval = 10*(sin(1.4*i)); 
//SigVal = (int) sinval;
Wire.write(SinLUT[i]);
//Wire.write(255);
 Wire.endTransmission(); // end tranmission
 //delay(20);
 }

}