unsigned char HWADR_DS1621 = 0b10010000;
	unsigned char HWADR_PCF8574 = 0b01000000;
	unsigned char A012 = 0b00001110;
	unsigned char R_W = 0;

	unsigned char ack;

  // inicializace prostredi
  avrkit_init();

  printf( "AVR-KIT ready...\n\n" );

  // uvedeni sbernice do klidoveho stavu
  I2C_Init();

  // zacatek komunikace
  I2C_Start();


	// citam ac
	ack = I2C_Vystup( HWADR_DS1621 | A012 | R_W );

	if (ack != 0)
		printf("Chyba\n");

	// AC = Access config
	ack = I2C_Vystup(0xAC);

	I2C_Start();
	R_W = 1;
	ack = I2C_Vystup( HWADR_DS1621 | A012 | R_W );
	R_W = 0;

	if (ack != 0)
		printf("Chyba\n");

	int config = I2C_Vstup();

	I2C_NAck();
	I2C_Stop();

	config = config & 0b11111110;

	// vkladam register
	I2C_Start();

	ack = I2C_Vystup( HWADR_DS1621 | A012 | R_W );

	if (ack != 0)
		printf("Chyba\n");

	// AC = Access config
	ack = I2C_Vystup(0xAC);
	ack = I2C_Vystup(config);

	I2C_Stop();

	//  start merania
	I2C_Start();

	ack = I2C_Vystup( HWADR_DS1621 | A012 | R_W );
	if (ack != 0)
		printf("Chyba\n");

	// EE = Prevod teploty
	ack = I2C_Vystup(0xEE);
	I2C_Stop();

	// citanie teploty

	I2C_Start();
	ack = I2C_Vystup( HWADR_DS1621 | A012 | R_W );

	// AA = read temp
	ack = I2C_Vystup(0xAA);

	// novy start, citanie
	I2C_Start();
	R_W = 1;
	ack = I2C_Vystup( HWADR_DS1621 | A012 | R_W );

	if (ack != 0)
		printf("Chyba\n");

	// prvy byte
	char prvyC = I2C_Vstup();
	I2C_Ack();

	// druhy byte
	char druhyC = I2C_Vstup();
	I2C_NAck();

	// STOP connect
	I2C_Stop();

	int desatina;

	if (druhyC == 0)
		desatina = 0;
	else
		desatina = 5;

	printf("%d\.%d\n", prvyC, desatina);