my platform goes up but doesnt come back down?

Questions & Answers
1

okay so, i’m following a 1 because i’m doing the same project for my exam next week, and i can’t seem to make the platform move as it should.
here’s what i’ve got:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class plataformaascendente : MonoBehaviour
{


    float velocidadPlataforma = 2;
    bool puntoLLegada;
    float puntoPartida;
    float puntoLLegadaY;

    public int unidadesaMover;


    // Use this for initialization
    void Start()
    {
        puntoPartida = transform.position.y ;
        puntoLLegadaY = puntoPartida + unidadesaMover;

    }

    // Update is called once per frame
    void Update()
    {
        if (puntoLLegada)
        {
            transform.position += Vector3.up * velocidadPlataforma * Time.deltaTime;
        }


        else
        {
            transform.position -= Vector3.up * velocidadPlataforma * Time.deltaTime;
        }

        if (transform.position.y >= puntoLLegadaY)
        {
            puntoLLegada = false;
        }

        if (transform.position.y <= puntoLLegadaY)
        {
            puntoLLegada = true;
        }
    }
}

again, i’m sorry about the spanish, and thanks for taking the time to read through this!

2

okay, someone already helped me, this is what worked:

    public float speed;
    public  float distance;
    public float downLimit;
    public float upLimit;
    public int dir = 1;
    public float PositionActual;
    public float PosicionStart;

    void Start()
    {

        PosicionStart = transform.position.y;
        downLimit = PosicionStart - distance;
        upLimit = PosicionStart + distance;
        speed = 5;

    }

  
    void Update()
    {
        PositionActual = transform.position.y;
        transform.position += Vector3.up * speed * Time.deltaTime * dir;

        if (PositionActual > upLimit)
        {
            dir = -1;
            GetComponent<SpriteRenderer>().flipX = false;
        }
        else if (PositionActual < downLimit)
        {
            dir = 1;
            GetComponent<SpriteRenderer>().flipX = true;
        }
    }