/*
 * TEST I2C - PCF8574 - 5V
 */
#include <Wire.h> 
int val = 0;
int rez = 0;
int led1 = 4;
int led2 = 11;
void setup() { 
  Wire.begin(); 
  Serial.begin(9600);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);  
}

void loop() {
  Wire.requestFrom(0x20, 1); 
  rez = 0;
  while(Wire.available()) 
  {
    int c = Wire.read(); // receive a byte as character
    rez = 255 - c;
    Serial.println(rez);
    if (rez == 1) {       
       digitalWrite(led1, HIGH);
    }
    else
    {
       digitalWrite(led1, LOW); 
    } 
    if (rez == 2) {       
       digitalWrite(led2, HIGH);
    }
    else
    {
       digitalWrite(led2, LOW); 
    }
  }
 delay(50);  
}