input_pcf8574

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

// Set i2c address
PCF8574 pcf1(0x20);
PCF8574 pcf2(0x21);
PCF8574 pcf3(0x22);
unsigned long cur_time, old_time;
bool stateLed = 0;
byte pin_led = 5;

byte pin_pcf[] = {0, 1, 2, 3, 4, 5, 6, 7};
byte dt_pcf1[10];
byte dt_pcf2[10];
byte dt_pcf3[10];

void setup() {
  // put your setup code here, to run once:
  delay(100);
  Serial.begin(115200);
  pinMode(pin_led, OUTPUT);

  Serial.print("Init pcf8574...");

  for (int i = 0; i < sizeof(pin_pcf); i++) {
    Serial.print(i); Serial.print(",");
    pcf1.pinMode(pin_pcf[i], INPUT);
    pcf2.pinMode(pin_pcf[i], INPUT);
    pcf3.pinMode(pin_pcf[i], INPUT);
  }
  Serial.println();

  if (pcf1.begin()) {
    Serial.println("pcf1 OK");
  } else {
    Serial.println("pcf1 NOK");
  }

  if (pcf2.begin()) {
    Serial.println("pcf2 OK");
  } else {
    Serial.println("pcf2 NOK");
  }

  if (pcf3.begin()) {
    Serial.println("pcf3 OK");
  } else {
    Serial.println("pcf3 NOK");
  }

  delay(100);
}

void loop() {
  // put your main code here, to run repeatedly:
  cur_time = millis();
  if (cur_time - old_time >= 500) {
    stateLed = !stateLed;
    digitalWrite(pin_led, stateLed);
    Serial.print("pcf1: ");
    for (int i = 0; i < sizeof(pin_pcf); i++) {
      Serial.print(pcf1.digitalRead(pin_pcf[i]));
      Serial.print(",");
      delay(5);
    }
    Serial.println();
    Serial.print("pcf2: ");
    for (int i = 0; i < sizeof(pin_pcf); i++) {
      Serial.print(pcf2.digitalRead(pin_pcf[i]));
      Serial.print(",");
      delay(5);
    }

    Serial.println();
    Serial.print("pcf3: ");
    for (int i = 0; i < sizeof(pin_pcf); i++) {
      Serial.print(pcf3.digitalRead(pin_pcf[i]));
      Serial.print(",");
      delay(5);
    }
    Serial.println();
    Serial.println();

    old_time = cur_time;
  }
}