[Arduino IDE demo source code for KC868-A6]--#07-PCF8574-Digital input code

Code:
#include "Arduino.h"

#include "PCF8574.h"



// Set i2c address

PCF8574 pcf8574(0x22,4,15);

unsigned long timeElapsed;

void setup()

{

 Serial.begin(115200);

 delay(1000);



 pcf8574.pinMode(P0, INPUT);

 pcf8574.pinMode(P1, INPUT);

 pcf8574.pinMode(P2, INPUT);

 pcf8574.pinMode(P3, INPUT);

 pcf8574.pinMode(P4, INPUT);

 pcf8574.pinMode(P5, INPUT);

 pcf8574.pinMode(P6, INPUT);

 pcf8574.pinMode(P7, INPUT);



    Serial.print("Init pcf8574...");

    if (pcf8574.begin()){

        Serial.println("OK");

    }else{

        Serial.println("KO");

    }

}



void loop()

{

 uint8_t val1 = pcf8574.digitalRead(P0);

 uint8_t val2 = pcf8574.digitalRead(P1);

 uint8_t val3 = pcf8574.digitalRead(P2);

 uint8_t val4 = pcf8574.digitalRead(P3);

 uint8_t val5 = pcf8574.digitalRead(P4);

 uint8_t val6 = pcf8574.digitalRead(P5);

 uint8_t val7 = pcf8574.digitalRead(P6);

 uint8_t val8 = pcf8574.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(300);

}