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cpp
void blah() {
    return;
}

ArduinoDiscordBot

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

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Like this

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const int Fridge = 2;
const int Freezer = 3;
const int DoorLED = 12;
const int Speaker = 13;
unsigned long startTime;
unsigned long currentTime;
const unsigned long period = 30000;

void setup() {

ArduinoDiscordBot

#include <Wire.h>

void setup() {
 Serial.begin(9600); /* begin serial for debug /
 Wire.begin(D1, D2); / join i2c bus with SDA=D1 and SCL=D2 of NodeMCU /
}

void loop() {
 Wire.beginTransmission(8); / begin with device address 8 /
 Wire.write("Hello Arduino");  / sends hello string /

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  pinMode (8, OUTPUT);
  pinMode (9, OUTPUT);
  pinMode (10, OUTPUT);
}
void loop() {
  digitalWrite(10, HIGH);
  delay (1000);
  digitalWrite (10, LOW);
  delay (1000);
  digitalWrite(9, HIGH);

ArduinoDiscordBot

void setup (){
  pinMode(8, OUTPUT);
  pinMode(2, INPUT);
  
}

void loop () {
  if (digitalRead(2) == HIGH){
  digitalWrite (8,HIGH);
  }

ArduinoDiscordBot

void setup (){
  pinMode(8, OUTPUT);
  pinMode(2, INPUT);
  
}

void loop () {
  if (digitalRead(2) == HIGH){
  digitalWrite (8,HIGH);
  }

ArduinoDiscordBot

#include <LCD.h>
#include <LiquidCrystal_SI2C.h>
#include <LiquidCrystal_SR.h>
#include <LiquidCrystal_SR1W.h>
#include <LiquidCrystal_SR2W.h>
#include <LiquidCrystal_SR3W.h>
#include <LCD.h>
#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>