JWan Wiki

Wiring:

  SDA → D2 (GPIO4)
  SCL → D1 (GPIO5)

PlatformIO:

   lib_deps = 
       marcoschwartz/LiquidCrystal_I2C@^1.1.4

#include <Arduino.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address (usually 0x27 or 0x3F)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  Wire.begin(); // SDA = D2(GPIO4), SCL = D1(GPIO5) on NodeMCU
  
  Serial.println("Initializing LCD...");
 
  // Initialize LCD
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.print("Hello World!");
  
  Serial.println("LCD should be working now");
}

void loop() {
  lcd.setCursor(0, 1);
  lcd.print("Millis: ");
  lcd.print(millis() / 1000);
  delay(1000);
}