Arduino MCP23017

/*
 Example 41.1 - Microchip MCP23017 with Arduino
*/
// pins 15~17 to GND, I2C bus address is 0x20
#include "Wire.h"
#define DELY 350
void setup()
{
 Wire.begin(); // wake up I2C bus
// set I/O pins to outputs
 Wire.beginTransmission(0x20);
 Wire.write(0x00); // IODIRA register
 Wire.write(0x00); // set all of port A to outputs
 Wire.endTransmission();
Wire.beginTransmission(0x20);
 Wire.write(0x01); // IODIRB register
 Wire.write(0x00); // set all of port B to outputs
 Wire.endTransmission();
}
void loop()
{

 Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x01); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x02); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x04); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x08); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x10); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x20); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x40); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x80); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x13); // address port B
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);

//PORT A
 Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x01); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x02); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);

Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x04); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x08); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x10); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x20); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x40); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x80); // value to send
Wire.endTransmission();
delay(DELY);


Wire.beginTransmission(0x20);
Wire.write(0x12); // address port A
Wire.write(0x00); // value to send
Wire.endTransmission();
delay(DELY);

}