[arduino code examples for A16v3]-02 Read digital input ports state

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Code:

/*
KeyPressed on PIN1
by Mischianti Renzo <http://www.mischianti.org>

https://www.mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/
*/

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

// Set i2c address
PCF8574 pcf8574_1(0x21);
PCF8574 pcf8574_2(0x22);
unsigned long timeElapsed;
void setup()
{
    Wire.begin(9, 10); // SDA: GPIO9, SCL: GPIO10 (for I2C communication)
  Serial.begin(115200);
    delay(1000);

//    pcf8574.pinMode(P0, OUTPUT);
pcf8574_1.pinMode(P0, INPUT);
pcf8574_1.pinMode(P1, INPUT);
pcf8574_1.pinMode(P2, INPUT);
pcf8574_1.pinMode(P3, INPUT);
pcf8574_1.pinMode(P4, INPUT);
pcf8574_1.pinMode(P5, INPUT);
pcf8574_1.pinMode(P6, INPUT);
pcf8574_1.pinMode(P7, INPUT);

pcf8574_2.pinMode(P0, INPUT);
pcf8574_2.pinMode(P1, INPUT);
pcf8574_2.pinMode(P2, INPUT);
pcf8574_2.pinMode(P3, INPUT);
pcf8574_2.pinMode(P4, INPUT);
pcf8574_2.pinMode(P5, INPUT);
pcf8574_2.pinMode(P6, INPUT);
pcf8574_2.pinMode(P7, INPUT);

    Serial.print("Init pcf8574...");
    if (pcf8574_1.begin()){
        Serial.println("pcf8574_1_OK");
    }else{
        Serial.println("pcf8574_1_KO");
    }

  Serial.print("Init pcf8574...");
  if (pcf8574_2.begin()){
    Serial.println("pcf8574_2_OK");
  }else{
    Serial.println("pcf8574_2_KO");
  }


}

void loop()
{
uint8_t val1 = pcf8574_1.digitalRead(P0);
uint8_t val2 = pcf8574_1.digitalRead(P1);
uint8_t val3 = pcf8574_1.digitalRead(P2);
uint8_t val4 = pcf8574_1.digitalRead(P3);
uint8_t val5 = pcf8574_1.digitalRead(P4);
uint8_t val6 = pcf8574_1.digitalRead(P5);
uint8_t val7 = pcf8574_1.digitalRead(P6);
uint8_t val8 = pcf8574_1.digitalRead(P7);

uint8_t val9 = pcf8574_2.digitalRead(P0);
uint8_t val10 = pcf8574_2.digitalRead(P1);
uint8_t val11 = pcf8574_2.digitalRead(P2);
uint8_t val12 = pcf8574_2.digitalRead(P3);
uint8_t val13 = pcf8574_2.digitalRead(P4);
uint8_t val14 = pcf8574_2.digitalRead(P5);
uint8_t val15 = pcf8574_2.digitalRead(P6);
uint8_t val16 = pcf8574_2.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");

if (val9==LOW) Serial.println("KEY9 PRESSED");
if (val10==LOW) Serial.println("KEY10 PRESSED");
if (val11==LOW) Serial.println("KEY11 PRESSED");
if (val12==LOW) Serial.println("KEY12 PRESSED");
if (val13==LOW) Serial.println("KEY13 PRESSED");
if (val14==LOW) Serial.println("KEY14 PRESSED");
if (val15==LOW) Serial.println("KEY15 PRESSED");
if (val16==LOW) Serial.println("KEY16 PRESSED");
    delay(300);
}

arduino ino file download:
  2-digital-input.zip (Size: 870 bytes / Downloads: 5)
BIN file (you can use esp32 download tool download to ESP32-S3 with address 0x0 then directly to use) download:
  2-digital-input.ino.merged.zip (Size: 191.48 KB / Downloads: 5)