Questions about PowerUps?

I created a basic powerup that will double my speed when I go over it. Now I would like to make the speed only last for ‘X’ number of seconds and for that PowerUp to not be active for ‘Y’ number of seconds. How should I go about doing this?

Here is my code:

void OnTriggerEnter (Collider collider)
			if (collider.CompareTag("PowerUp"))
				IncreaseSpeed (Speed + Speed);

The best way to do that would be to use Coroutines and WaitForSeconds.

Coroutines are enumerators that can be started by a MonoBehaviour, and are executed separately by the engine, on a frame-by-frame basis. A very convenient feature is the ability of Coroutines to suspend execution for a given amount of time, which is hands down the best way to deal with bonus duration and bonus cooldown.

So what you need to do is :

  • Lock the power up when it is activated

  • Increase speed

  • Wait for X seconds

  • Reset speed

  • Wait for Y seconds

  • Unlock the powerup

    using UnityEngine;
    using System.Collections;

    public class Player : MonoBehaviour
    float m_Speed = 10f;
    float m_DefaultSpeedBonus = 10f;
    float m_DefaultPowerUpDuration = 5f;
    float m_DefaultPowerUpCooldown = 10f;
    bool m_PowerUpIsActivable = true;

     IEnumerator SpeedPowerUp(float bonus, float bonusDuration, float cooldown)
         // Lock the PowerUp
         m_PowerUpIsActivable = false;
         // Activate the speed bonus
         m_Speed += bonus;
         // Let it last for bonusDuration seconds
         yield return new WaitForSeconds(bonusDuration);
         // Remove the speed bonus
         m_Speed -= bonus;
         // Start cooldown
         yield return new WaitForSeconds(cooldown);
         // After cooldown is over, unlock the PowerUp
         m_PowerUpIsActivable = true;
     void OnTriggerEnter(Collider collider)
         if (collider.CompareTag("PowerUp") && m_PowerUpIsActivable)
             StartCoroutine(SpeedPowerUp(m_DefaultSpeedBonus, m_DefaultPowerUpDuration, m_DefaultPowerUpCooldown));

    You can apply the same logic to any PowerUp you want to implement.