ESP8266 with a shift register 74HC595 programmed with the Arduino IDE

ESP8266-74HC595-ShiftOut.ino

/* Example of using ES8266 with a 74HC595 shift register
** the ShiftOut function without any libraries
** LEDs will count from 0 to 255 in binary
** For more details, see http://42bots.com
--------------------------------------------------------
** Connections:
** ESP8266 GPIO13 to 74HC595 pin 14
** ESP8266 GPIO15 to 74HC595 pin 12
** ESP8266 GPIO14 to 74HC595 pin 11
** 74HC595 Vcc is connected to 3.3V
** 8 LEDs connected to the 8 outputs of the 74HC595
** via approariate velue resistor (I use 1k Ohm)
*/

int latchPin = 15; // pin D8 on NodeMCU boards
int clockPin = 14; // pin D5 on NodeMCU boards
int dataPin = 13; // pin D7 on NodeMCU boards
 
void setup() 
{
//set pins to output so you can control the shift register
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
}
 
void loop()
{
  for (int i=0; i<=255; i++) {
    digitalWrite(latchPin, LOW);
    // shift out the bits:
    shiftOut(dataPin, clockPin, MSBFIRST, i);
    //take the latch pin high so the LEDs will light up:
    digitalWrite(latchPin, HIGH);
    // pause before next value:
    delay(500);
  }
}