[Arduino source code for KC868-A4S]-03 DI

Code:
#include "Arduino.h"

#include "PCF8574.h"



// Set i2c address

PCF8574 pcf8574_IN1(0x22,4,16);

unsigned long timeElapsed;

void setup()

{

    Serial.begin(115200);

    delay(1000);



pcf8574_IN1.pinMode(P0, INPUT);

pcf8574_IN1.pinMode(P1, INPUT);

pcf8574_IN1.pinMode(P2, INPUT);

pcf8574_IN1.pinMode(P3, INPUT);

pcf8574_IN1.pinMode(P4, INPUT);

pcf8574_IN1.pinMode(P5, INPUT);

pcf8574_IN1.pinMode(P6, INPUT);

pcf8574_IN1.pinMode(P7, INPUT);

pcf8574_IN1.begin();

}



void loop()

{

uint8_t val1 = pcf8574_IN1.digitalRead(P0);

uint8_t val2 = pcf8574_IN1.digitalRead(P1);

uint8_t val3 = pcf8574_IN1.digitalRead(P2);

uint8_t val4 = pcf8574_IN1.digitalRead(P3);

uint8_t val5 = pcf8574_IN1.digitalRead(P4);

uint8_t val6 = pcf8574_IN1.digitalRead(P5);

uint8_t val7 = pcf8574_IN1.digitalRead(P6);

uint8_t val8 = pcf8574_IN1.digitalRead(P7);

if (val1==LOW) {Serial.println("Key1 Pressed");}

if (val2==LOW) {Serial.println("Key2 Pressed");}

if (val3==LOW) {Serial.println("Key3 Pressed");}

if (val4==LOW) {Serial.println("Key4 Pressed");}

if (val5==LOW) {Serial.println("Key5 Pressed");}

if (val6==LOW) {Serial.println("Key6 Pressed");}

if (val7==LOW) {Serial.println("Key7 Pressed");}

if (val8==LOW) {Serial.println("Key8 Pressed");}



delay(20);

}