#include <Wire.h>
#include <PCF8574.h>
#include<WiFi.h>



#define ssid "Wokwi-GUEST"
#define pass ""
PCF8574 pcf(0x20);
PCF8574 pcf1(0x21);
PCF8574 pcf2(0x22);
PCF8574 pcf3(0x23);
PCF8574 pcf4(0x24);
PCF8574 pcf5(0x25);
PCF8574 pcf6(0x26);
PCF8574 pcf7(0x27);

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);
  WiFi.begin(ssid,pass);
  while(WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(300);
  }
  Serial.println("Wifi connected");

  }

void loop() {
  for (int i = 0; i < 8; i++) {
    pcf.write(i, 1);  
    pcf1.write(i, 1); 
    pcf2.write(i, 1); 
    pcf3.write(i, 1); 
    pcf4.write(i, 1); 
    pcf5.write(i, 1);
    pcf6.write(i, 1);
    pcf7.write(i, 1);
    delay(300);
    pcf.write(i, 0); 
    pcf1.write(i, 0); 
    pcf2.write(i, 0); 
    pcf3.write(i, 0); 
    pcf4.write(i, 0); 
    pcf5.write(i, 0); 
    pcf6.write(i, 0); 
    pcf7.write(i, 0); 
  }
  
}