command does not work

[admin]

you can use these code (input trigger output) :

#include "Arduino.h"
#include "PCF8574.h"


TwoWire I2Cone = TwoWire(0);
//TwoWire I2Ctwo = TwoWire(1);

// Set i2c address
PCF8574 pcf8574_I1(&I2Cone, 0x21, 4, 5);
PCF8574 pcf8574_I2(&I2Cone, 0x22, 4, 5);

PCF8574 pcf8574_R1(&I2Cone, 0x24, 4, 5);
PCF8574 pcf8574_R2(&I2Cone, 0x25, 4, 5);

void setup()
{
// 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(30);

}