[arduino code examples for A16v3]-12 digital INPUT trigger OUTPUT directly

Code:
#include <Wire.h>        // I2C communication

#include <PCF8574.h>     // Library to control the PCF8575 I/O expander



// Define I2C pins

#define SDA 9           // SDA pin

#define SCL 10           // SCL pin

TwoWire I2Cone = TwoWire(0);



PCF8574 pcf8574_I1(&I2Cone, 0x21, SDA, SCL);

PCF8574 pcf8574_I2(&I2Cone, 0x22, SDA, SCL);



PCF8574 pcf8574_R1(&I2Cone, 0x24, SDA, SCL);

PCF8574 pcf8574_R2(&I2Cone, 0x25, SDA, SCL);



void setup() {

  

  // Initialize serial communication

  Serial.begin(115200);

  

  // Initialize input and relay modules

  // 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_I1.pinMode(P0, INPUT);

 pcf8574_I1.pinMode(P1, INPUT);

 pcf8574_I1.pinMode(P2, INPUT);

 pcf8574_I1.pinMode(P3, INPUT);

 pcf8574_I1.pinMode(P4, INPUT);

 pcf8574_I1.pinMode(P5, INPUT);

 pcf8574_I1.pinMode(P6, INPUT);

 pcf8574_I1.pinMode(P7, INPUT);



 pcf8574_I2.pinMode(P0, INPUT);

 pcf8574_I2.pinMode(P1, INPUT);

 pcf8574_I2.pinMode(P2, INPUT);

 pcf8574_I2.pinMode(P3, INPUT);

 pcf8574_I2.pinMode(P4, INPUT);

 pcf8574_I2.pinMode(P5, INPUT);

 pcf8574_I2.pinMode(P6, INPUT);

 pcf8574_I2.pinMode(P7, INPUT);



  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...");

  if (pcf8574_I1.begin()){

    Serial.println("pcf8574_I1_OK");

  }else{

    Serial.println("pcf8574_I1_KO");

  }



  Serial.print("Init pcf8574...");

  if (pcf8574_I2.begin()){

    Serial.println("pcf8574_I2_OK");

  }else{

    Serial.println("pcf8574_I2_KO");

  }



  pcf8574_R1.digitalWrite(P0, HIGH);

  pcf8574_R1.digitalWrite(P1, HIGH);

  pcf8574_R1.digitalWrite(P2, HIGH);

  pcf8574_R1.digitalWrite(P3, HIGH);

  pcf8574_R1.digitalWrite(P4, HIGH);

  pcf8574_R1.digitalWrite(P5, HIGH);

  pcf8574_R1.digitalWrite(P6, HIGH);

  pcf8574_R1.digitalWrite(P7, HIGH);

  



  pcf8574_R2.digitalWrite(P0, HIGH);

  pcf8574_R2.digitalWrite(P1, HIGH);

  pcf8574_R2.digitalWrite(P2, HIGH);

  pcf8574_R2.digitalWrite(P3, HIGH);

  pcf8574_R2.digitalWrite(P4, HIGH);

  pcf8574_R2.digitalWrite(P5, HIGH);

  pcf8574_R2.digitalWrite(P6, HIGH);

  pcf8574_R2.digitalWrite(P7, HIGH);



}



void loop() {

 uint8_t val1 = pcf8574_I1.digitalRead(P0);

 uint8_t val2 = pcf8574_I1.digitalRead(P1);

 uint8_t val3 = pcf8574_I1.digitalRead(P2);

 uint8_t val4 = pcf8574_I1.digitalRead(P3);

 uint8_t val5 = pcf8574_I1.digitalRead(P4);

 uint8_t val6 = pcf8574_I1.digitalRead(P5);

 uint8_t val7 = pcf8574_I1.digitalRead(P6);

 uint8_t val8 = pcf8574_I1.digitalRead(P7);



 uint8_t val9 = pcf8574_I2.digitalRead(P0);

 uint8_t val10 = pcf8574_I2.digitalRead(P1);

 uint8_t val11 = pcf8574_I2.digitalRead(P2);

 uint8_t val12 = pcf8574_I2.digitalRead(P3);

 uint8_t val13 = pcf8574_I2.digitalRead(P4);

 uint8_t val14 = pcf8574_I2.digitalRead(P5);

 uint8_t val15 = pcf8574_I2.digitalRead(P6);

 uint8_t val16 = pcf8574_I2.digitalRead(P7);



//------------------------------------

 if (val1==LOW) pcf8574_R1.digitalWrite(P0, LOW); else pcf8574_R1.digitalWrite(P0, HIGH);

 if (val2==LOW) pcf8574_R1.digitalWrite(P1, LOW); else pcf8574_R1.digitalWrite(P1, HIGH);

 if (val3==LOW) pcf8574_R1.digitalWrite(P2, LOW); else pcf8574_R1.digitalWrite(P2, HIGH);

 if (val4==LOW) pcf8574_R1.digitalWrite(P3, LOW); else pcf8574_R1.digitalWrite(P3, HIGH);

 if (val5==LOW) pcf8574_R1.digitalWrite(P4, LOW); else pcf8574_R1.digitalWrite(P4, HIGH);

 if (val6==LOW) pcf8574_R1.digitalWrite(P5, LOW); else pcf8574_R1.digitalWrite(P5, HIGH);

 if (val7==LOW) pcf8574_R1.digitalWrite(P6, LOW); else pcf8574_R1.digitalWrite(P6, HIGH);

 if (val8==LOW) pcf8574_R1.digitalWrite(P7, LOW); else pcf8574_R1.digitalWrite(P7, HIGH);



 if (val9==LOW) pcf8574_R2.digitalWrite(P0, LOW); else pcf8574_R2.digitalWrite(P0, HIGH);

 if (val10==LOW) pcf8574_R2.digitalWrite(P1, LOW); else pcf8574_R2.digitalWrite(P1, HIGH);

 if (val11==LOW) pcf8574_R2.digitalWrite(P2, LOW); else pcf8574_R2.digitalWrite(P2, HIGH);

 if (val12==LOW) pcf8574_R2.digitalWrite(P3, LOW); else pcf8574_R2.digitalWrite(P3, HIGH);

 if (val13==LOW) pcf8574_R2.digitalWrite(P4, LOW); else pcf8574_R2.digitalWrite(P4, HIGH);

 if (val14==LOW) pcf8574_R2.digitalWrite(P5, LOW); else pcf8574_R2.digitalWrite(P5, HIGH);

 if (val15==LOW) pcf8574_R2.digitalWrite(P6, LOW); else pcf8574_R2.digitalWrite(P6, HIGH);

 if (val16==LOW) pcf8574_R2.digitalWrite(P7, LOW); else pcf8574_R2.digitalWrite(P7, HIGH);



  // Delay for 500 milliseconds

  delay(50);

}