Toggle Button For Timed Device When Timer Runs Out

I'm trying to make a toggle button so that when the timer reaches 0 the toggled device will turn on.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class CountdownTimerManager : MonoBehaviour {
     
     public AudioClip Alarm;
     float timer  = 3600;
     bool isFinishedTimer   = true;
     public UnityEngine.UI.Text displayText;
     public UnityEngine.UI.Text timeText;
     
     string minsDisplay;
     string secsDisplay;
     
     int mySeconds  = 0;
     int sysHour = System.DateTime.Now.Hour;
     
     private float oldTimer;
     
     //Random Clips
     public AudioClip[] voices;
     public AudioClip[] timeVoices; //Noon Time
     public AudioClip[] timeVoices2; //Morning Time
     public AudioClip[] timeVoices3; //Night Time
 
     public static CountdownTimerManager countDownManager;
     
     void Awake () {
         if (countDownManager == null) {
             DontDestroyOnLoad (gameObject);
             countDownManager = this;
         } else if (countDownManager != this) {
             Destroy (gameObject);
         }
 
         //Time OF Day Notification
         //Noon Time
         if (sysHour == 12) {
             GetComponent<AudioSource>().clip = timeVoices[Random.Range(0,timeVoices.Length)];
             GetComponent<AudioSource>().Play();
             Debug.Log ("Good Afternoon!");
         } 
         //Morning Time
         else if (sysHour == 8) {
             GetComponent<AudioSource>().clip = timeVoices2[Random.Range(0,timeVoices2.Length)];
             GetComponent<AudioSource>().Play();
             Debug.Log ("Good Morning!");
         }
         //Night Time
         else if (sysHour == 22) { 
             GetComponent<AudioSource>().clip = timeVoices3[Random.Range(0,timeVoices3.Length)];
             GetComponent<AudioSource>().Play();
             Debug.Log ("Good Night!");
         }
         else{
             //Do something if desired
             Debug.Log("Go to bed!");
         }
     }
     
     void Start(){
         
         oldTimer = timer;
     }
     
     void Update(){
         
         if (!isFinishedTimer) {
             timer -= Time.deltaTime;
         }
         
         CurrentTime();
     }
     
     void CurrentTime() {
         System.DateTime dt  = System.DateTime.Now;
         int h  = dt.Hour;
         int m  = dt.Minute;
         int s  = dt.Second;
         
         timeText.text = h + ":" + m + ":" + s;
         
         if(mySeconds != s)
         {
             mySeconds = s;
             //Timing();
             StartCoroutine(Timing());
         }
         
     }
     
     IEnumerator  Timing()
     {
         if (timer > 0) {
             //var minsDisplay : String = parseInt( timer / 60 ).ToString();
             minsDisplay = System.Convert.ToInt32( timer / 60 ).ToString();
             
             //var secsDisplay : String = parseInt( timer ).ToString();
             secsDisplay = System.Convert.ToInt32( timer ).ToString();
             
             if ( (timer - ( System.Convert.ToInt32(minsDisplay) * 60)) > 10 ) {
                 secsDisplay = System.Convert.ToInt32( timer - ( System.Convert.ToInt32(minsDisplay) * 60) ).ToString();
             }
             else {
                 secsDisplay = "0" + System.Convert.ToInt32( timer - ( System.Convert.ToInt32(minsDisplay) * 60) ).ToString();
             }
             
             //displayText.text = minsDisplay + " : " + secsDisplay;
         }
         //Timer Reaches End We Can Do Something Here
         else {
             timer += oldTimer;
             GetComponent<AudioSource>().PlayOneShot(Alarm);//Plays Alarm Sound
             isFinishedTimer = true;//Sets Inspector Value to true or false based on what is set here
             yield return new WaitForSeconds(5.8f);//Wait Time Setting
             //Do Something if Desired
             
             //if (GetComponent.<AudioSource>().isPlaying) return; // don't play a new sound while the last hasn't finished
             GetComponent<AudioSource>().clip = voices[Random.Range(0,voices.Length)];
             GetComponent<AudioSource>().Play();
 
             
             yield return new WaitForSeconds(0.8f);//Wait Time Setting
             //Do Something if Desired
             //Sending.sendBlue ();
             //Sending.sendRed ();
             Debug.Log ("Timer Ended");
         }
         displayText.text = minsDisplay + " : " + secsDisplay;
     }
     
     
     
     //Timer Stop Button
     public void GoTimerStop()
     {
         isFinishedTimer = true;
     }
     
     //Timer Start Button
     public void GoTimerStart()
     {
         isFinishedTimer = false;
     }
     
     //Timer Settings
     public void GoTimerSetting60Sec()
     {
         timer = 60;
     }
     
     public void GoTimerSetting5Min()
     {
         timer = 300;
     }
     
     public void GoTimerSetting10Min()
     {
         timer = 600;
     }
     
     public void GoTimerSetting20Min()
     {
         timer = 1200;
     }
     
     public void GoTimerSetting30Min()
     {
         timer = 1800;
     }
     
     public void GoTimerSetting40Min()
     {
         timer = 2400;
     }
     
     public void GoTimerSetting50Min()
     {
         timer = 3000;
     }
     
     public void GoTimerSetting1Hr()
     {
         timer = 3600;
     }
     
     public void GoTimerSetting1Point5Hr()
     {
         timer = 5400;
     }
     
     public void GoTimerSetting2Hr()
     {
         timer = 7200;
     }
     
     public void GoTimerSetting2Point5Hr()
     {
         timer = 9000;
     }
     
     public void GoTimerSetting3Hr()
     {
         timer = 10800;
     }
 
     //Device One Toggle
     public void ToogleDeviceOne() {
         //Device Set to go off with timer Here
         if (timer < 0) {
             isFinishedTimer = true;
             Sending.sendBlue();
         } 
         else {
             //Something
 
         }
     }
 }