[Arduino IDE demo source code for KC868-A32]--#05-PCF8574-DO

Code:
#include "Arduino.h"

#include "PCF8574.h"



TwoWire I2Ctwo = TwoWire(1);



// Set i2c address

PCF8574 pcf8574_R1(&I2Ctwo, 0x24, 15, 13);

PCF8574 pcf8574_R2(&I2Ctwo, 0x25, 15, 13);

PCF8574 pcf8574_R3(&I2Ctwo, 0x21, 15, 13);

PCF8574 pcf8574_R4(&I2Ctwo, 0x22, 15, 13);



void setup()

{

    Serial.begin(115200);

//    delay(1000);



    // Set pinMode to OUTPUT

 pcf8574_R1.pinMode(P0, OUTPUT);

 pcf8574_R1.pinMode(P1, OUTPUT);

 pcf8574_R1.pinMode(P2, OUTPUT);

 pcf8574_R1.pinMode(P3, OUTPUT);

 pcf8574_R1.pinMode(P4, OUTPUT);

 pcf8574_R1.pinMode(P5, OUTPUT);

 pcf8574_R1.pinMode(P6, OUTPUT);

 pcf8574_R1.pinMode(P7, OUTPUT);



 pcf8574_R2.pinMode(P0, OUTPUT);

 pcf8574_R2.pinMode(P1, OUTPUT);

 pcf8574_R2.pinMode(P2, OUTPUT);

 pcf8574_R2.pinMode(P3, OUTPUT);

 pcf8574_R2.pinMode(P4, OUTPUT);

 pcf8574_R2.pinMode(P5, OUTPUT);

 pcf8574_R2.pinMode(P6, OUTPUT);

 pcf8574_R2.pinMode(P7, OUTPUT);



 pcf8574_R3.pinMode(P0, OUTPUT);

 pcf8574_R3.pinMode(P1, OUTPUT);

 pcf8574_R3.pinMode(P2, OUTPUT);

 pcf8574_R3.pinMode(P3, OUTPUT);

 pcf8574_R3.pinMode(P4, OUTPUT);

 pcf8574_R3.pinMode(P5, OUTPUT);

 pcf8574_R3.pinMode(P6, OUTPUT);

 pcf8574_R3.pinMode(P7, OUTPUT);



 pcf8574_R4.pinMode(P0, OUTPUT);

 pcf8574_R4.pinMode(P1, OUTPUT);

 pcf8574_R4.pinMode(P2, OUTPUT);

 pcf8574_R4.pinMode(P3, OUTPUT);

 pcf8574_R4.pinMode(P4, OUTPUT);

 pcf8574_R4.pinMode(P5, OUTPUT);

 pcf8574_R4.pinMode(P6, OUTPUT);

 pcf8574_R4.pinMode(P7, OUTPUT);



    Serial.print("Init pcf8574_R1...");

    if (pcf8574_R1.begin()){

        Serial.println("PCF8574_R1_OK");

    }else{

        Serial.println("PCF8574_R1_KO");

    }



  Serial.print("Init pcf8574_R2...");

  if (pcf8574_R2.begin()){

    Serial.println("PCF8574_R2_OK");

  }else{

    Serial.println("PCF8574_R2_KO");

  }



  Serial.print("Init pcf8574_R3...");

  if (pcf8574_R3.begin()){

    Serial.println("PCF8574_R3_OK");

  }else{

    Serial.println("PCF8574_R3_KO");

  }



  Serial.print("Init pcf8574_R4...");

  if (pcf8574_R4.begin()){

    Serial.println("PCF8574_R4_OK");

  }else{

    Serial.println("PCF8574_R4_KO");

  }







}



void loop()

{

    pcf8574_R1.digitalWrite(P0, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P1, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P2, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P3, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P4, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P5, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P6, LOW);

  delay(200);

  pcf8574_R1.digitalWrite(P7, LOW);

  delay(200);



  pcf8574_R2.digitalWrite(P0, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P1, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P2, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P3, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P4, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P5, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P6, LOW);

  delay(200);

  pcf8574_R2.digitalWrite(P7, LOW);

  delay(200);



  pcf8574_R3.digitalWrite(P0, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P1, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P2, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P3, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P4, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P5, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P6, LOW);

  delay(200);

  pcf8574_R3.digitalWrite(P7, LOW);

  delay(200);



  pcf8574_R4.digitalWrite(P0, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P1, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P2, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P3, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P4, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P5, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P6, LOW);

  delay(200);

  pcf8574_R4.digitalWrite(P7, LOW);

  delay(200);

}