#include <Wire.h>

void setup() {
  Wire.begin(); // join i2c bus (address optional for master)
}



void loop() {


  //----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0xf9);              // sends 1 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x24);              // sends 2 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x30);              // sends 3 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x19);              // sends 4 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x12);              // sends 5 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x02);              // sends 6 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0xF8);              // sends 7 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x00);              // sends 8 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x10);              // sends 9 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
  Wire.beginTransmission(0x20); // transmit to PCF8574
  Wire.write(0x40);              // sends 0 to 7-Segment
  Wire.endTransmission();    // stop transmitting
  delay(1000);
  //-----------------------------------------------------------------------
}