wire_pcf8574_esp32.ino

/*
* By JackRoboticS
* www.jackrobotics.me
*/

#include "Wire.h"
TwoWire WIRE(0);

byte ADDRESS_PCF8574 = 0B0100000 | 0B000;  //address 000
//byte ADDRESS_PCF8574 = 0B0100000 | 0B001;  //address 001
//byte ADDRESS_PCF8574 = 0B0100000 | 0B010;  //address 010
//byte ADDRESS_PCF8574 = 0B0100000 | 0B011;  //address 011
//byte ADDRESS_PCF8574 = 0B0100000 | 0B100;  //address 100
//byte ADDRESS_PCF8574 = 0B0100000 | 0B101;  //address 101
//byte ADDRESS_PCF8574 = 0B0100000 | 0B110;  //address 110
//byte ADDRESS_PCF8574 = 0B0100000 | 0B111;  //address 111

void setup() {
  WIRE.begin(21,22);
  WIRE.setClock(100000L);
}

void busWrite(byte addr,byte io){
  WIRE.beginTransmission(addr);   // begin transmission and set address
  WIRE.write(io);                 // send data io
  WIRE.endTransmission();         // end transmission
}

byte busRead(byte addr){
  byte io = 0x00;
  WIRE.requestFrom(addr, 1);   // request data from address
  if (WIRE.available()) {
    io = WIRE.read();          // read data io
  }
  return io;
}

void loop() {
//  byte io = busRead(ADDRESS_PCF8574);

  busWrite(ADDRESS_PCF8574,0B00000000);
  delay(1000);
  busWrite(ADDRESS_PCF8574,0B11111111);
  delay(1000);
}