diff --git a/esp32_blink.ino b/esp32_blink.ino
index f2ee64d..c1ebc3a 100644
--- a/esp32_blink.ino
+++ b/esp32_blink.ino
@@ -1,39 +1,90 @@
 #define LED 13
 
-#include "OneWire.h"
-#include "DallasTemperature.h"
+// the granularity of scheduler is 2 minutes,
+// therefor we define the BI_MINUTE to be 2*60 seconds
+#define BI_MINUTE (2*60*1000)
 
-OneWire oneWire(A3);
-DallasTemperature ds(&oneWire);
+// our scheduler loop every 24 hour.
+// one hour is represented by 1 unsigned int
+// each bit of the hour represent one BI_MINUTE.
+// the output of the scheduler is ON if one bit is set, OFF otherwise.
+unsigned int scheduler[24] = {
+  0b00000000000000000111111111111111, // here we set the output ON from 0 to 15th biminute so half of the hour
+  0, // all other hours are set to 0
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+  0,
+};
+
+// variables to keep track of the current our and biminute.
+int hour=0;
+int biminute=0;
 
 void setup() {
   // put your setup code here, to run once:
   Serial.begin(115200);
+  delay(1000);
+  Serial.println("Starting.");
   pinMode(LED, OUTPUT);
-  ds.begin();
 }
 
+void loop() { 
+  if ((scheduler[hour] >> biminute) & 1) {
+    digitalWrite(LED, HIGH); 
+    Serial.println("Scheduler: ON");
+  } else {
+     digitalWrite(LED, LOW);
+    Serial.println("Scheduler: OFF");
+  }
+
+  biminute += 1;
+  if(biminute >= 30) {
+    biminute = 0;
+    hour += 1;
+    if(hour >=  24) {
+      hour = 0;
+    }
+  }
+  delay(BI_MINUTE);
+}
+
+/*
 void loop() {
   // put your main code here, to run repeatedly:
   digitalWrite(LED, HIGH);
-  for(int i=0; i < 100; ++i) {
-    delay(50);
+  for(int i=0; i < 10; ++i) {
+    delay(500);
     print_light();
   }
   digitalWrite(LED, LOW);
-  for(int i=0; i < 100; ++i) {
-    delay(50);
+  for(int i=0; i < 10; ++i) {
+    delay(500);
     print_light();
   }
 }
+*/
 
 void print_light() {
   int val = analogRead(A0);
   Serial.print("Light: ");
-  Serial.print(val);
-
-  ds.requestTemperatures();
-  int t = ds.getTempCByIndex(0);
-  Serial.print("; Temp: ");
-  Serial.println(t);
+  Serial.println(val);
 }