diff --git a/apps/apps.h b/apps/apps.h
new file mode 100644
index 0000000..330944b
--- /dev/null
+++ b/apps/apps.h
@@ -0,0 +1,5 @@
+#ifndef APPS_H
+#define APPS_H
+
+#include "helloWorldApp/helloWorldMain.h"
+#endif
diff --git a/apps/apps.mains.c b/apps/apps.mains.c
index e69de29..673d461 100644
--- a/apps/apps.mains.c
+++ b/apps/apps.mains.c
@@ -0,0 +1,8 @@
+#include "apps.mains.h"
+
+struct Apps apps[APPSIZE] = {
+	{
+		.name = "Brightness",
+		.pointer = helloWorld
+	}
+};
diff --git a/apps/apps.mains.h b/apps/apps.mains.h
index e69de29..2d2e908 100644
--- a/apps/apps.mains.h
+++ b/apps/apps.mains.h
@@ -0,0 +1,18 @@
+#ifndef APPS_MAINS_H
+#define APPS_MAINS_H
+
+#include "../config.h"
+#include "../main.h"
+#include "apps.h"
+
+
+typedef void (*functionptr_t)();
+struct Apps{
+	char name[16];
+	functionptr_t pointer;
+};
+
+
+extern struct Apps apps[APPSIZE];
+
+#endif
diff --git a/apps/helloWorldApp/helloWorldMain.c b/apps/helloWorldApp/helloWorldMain.c
new file mode 100644
index 0000000..b2a4cde
--- /dev/null
+++ b/apps/helloWorldApp/helloWorldMain.c
@@ -0,0 +1,21 @@
+#include "helloWorldMain.h"
+
+void helloWorld (void) {
+	uint8_t exit=0;
+	screen_clear();
+	screen_normal();
+
+	render_sentence_xy("Hello World",20,2);
+
+	while(!exit) {
+		if(PRESSED_INPUT_NEGATIVE){
+			exit = 1;
+			screen_clear();
+			_delay_ms(200);
+		}
+
+		if (PRESSED_INPUT_POSITIVE) {
+			screen_invert();
+		}
+	}
+}
diff --git a/apps/helloWorldApp/helloWorldMain.h b/apps/helloWorldApp/helloWorldMain.h
new file mode 100644
index 0000000..0e368fa
--- /dev/null
+++ b/apps/helloWorldApp/helloWorldMain.h
@@ -0,0 +1,11 @@
+#ifndef HELLOWORLDMAIN_H
+#define HELLOWORLDMAIN_H
+
+
+#include "../../device_drivers/screen/screen.h"
+#include "../../device_drivers/input/input.h"
+#include "../../main.h"
+extern void helloWorld(void);
+
+
+#endif
diff --git a/apps/helloWorldApp/main.c b/apps/helloWorldApp/main.c
deleted file mode 100644
index e69de29..0000000
diff --git a/apps/helloWorldApp/main.h b/apps/helloWorldApp/main.h
deleted file mode 100644
index e69de29..0000000
diff --git a/config.h b/config.h
index c8bb930..dda2d61 100644
--- a/config.h
+++ b/config.h
@@ -3,7 +3,7 @@
 
 #define F_CPU 11059200UL
 
-#define APPSIZE 3
+#define APPSIZE 2
 #define true 1
 #define false 0
 
diff --git a/main.c b/main.c
index cbb26ab..05934a6 100755
--- a/main.c
+++ b/main.c
@@ -1,15 +1,5 @@
 #include "main.h"
 
-/*
-PD2  positive response
-PD3 negative response
-
-PD4 left
-PD5 right
-PD6 down
-PD7 right
-*/
-
 uint8_t brightness = 100;
 volatile char datetime[21];
 char hhmmss[9];
@@ -42,13 +32,70 @@ int main(){
 	while(1){
     	render_sentence_xy(hhmmss,15,2);
 		set_cursor_bank(15,3);
-		render_sentence_xy("`C Mysuru",27,3);
+		render_sentence_xy("Mysuru",27,3);
 
 		screen_invert();
+
+
+		if(PRESSED_INPUT_NEGATIVE){
+			goto_sleep(); // in utils
+		}
+
+		if (PRESSED_INPUT_POSITIVE) {
+			menu_state_machine();
+		}
 	}
 	return 0;
 }
 
+void menu_state_machine (void) {
+	//App state machine
+	_delay_ms(100);
+ 	uint8_t current_menu = 0;
+	uint8_t exit = false;
+	screen_clear();
+	screen_normal();
+	while(!exit){
+		render_sentence_xy(apps[current_menu].name,20,2);
+		screen_invert();
+
+		//When top is selected show previous app
+		if(PRESSED_INPUT_TOP){
+			if(current_menu < APPSIZE -1){
+				current_menu++;
+			}else{
+				current_menu = 0;
+			}
+			_delay_ms(100);
+			_delay_ms(50);
+			screen_clear();
+		}
+
+		// If negative, go back to home screen
+		if(PRESSED_INPUT_NEGATIVE){
+			_delay_ms(100);
+			exit = true;
+			screen_clear();
+		}
+
+		//If down, show next app
+		if(PRESSED_INPUT_DOWN){
+			if(current_menu > 0)
+				current_menu--;
+			else
+				current_menu = APPSIZE -1;
+			_delay_ms(100);
+			screen_clear();
+		}
+
+		//goto app
+		if(PRESSED_INPUT_LEFT | PRESSED_INPUT_RIGHT){
+			_delay_ms(100);
+			apps[current_menu].pointer();
+		}
+	}
+}
+
 
 
 ISR(INT0_vect){
diff --git a/main.h b/main.h
index e276b6a..005cb06 100644
--- a/main.h
+++ b/main.h
@@ -6,16 +6,37 @@
 #include<util/delay.h>
 #include<avr/pgmspace.h>
 #include<avr/interrupt.h>
-#include<avr/sleep.h>
 #include <string.h>
 
 #include "peripheral_drivers/serial/serial.h"
 #include "peripheral_drivers/pwm/pwm.h"
 #include "peripheral_drivers/i2c/i2c.h"
+#include "peripheral_drivers/sleep/at_sleep.h"
 
 #include "device_drivers/screen/screen.h"
 #include "device_drivers/input/input.h"
 #include "device_drivers/rtc/rtc.h"
 #include "utils/utils.h"
 
+#include "apps/apps.mains.h"
+
+/*
+PD2  positive response
+PD3 negative response
+
+PD4 left
+PD5 right
+PD6 down
+PD7 right
+*/
+
+
+#define PRESSED_INPUT_NEGATIVE (input_status & (1<<NEGAT))
+#define PRESSED_INPUT_POSITIVE (input_status & (1<<POSIT))
+#define PRESSED_INPUT_TOP (input_status & (1<<NAVI_TOP))
+#define PRESSED_INPUT_DOWN (input_status & (1<<NAVI_DOWN))
+#define PRESSED_INPUT_LEFT  (input_status & (1<<NAVI_LEFT))
+#define PRESSED_INPUT_RIGHT (input_status & (1<<NAVI_RIGHT))
+
+void menu_state_machine (void);
 #endif
diff --git a/peripheral_drivers/sleep/at_sleep.c b/peripheral_drivers/sleep/at_sleep.c
new file mode 100644
index 0000000..0653d67
--- /dev/null
+++ b/peripheral_drivers/sleep/at_sleep.c
@@ -0,0 +1,21 @@
+#include "at_sleep.h"
+
+void goto_sleep(void) {
+	MCUCSR &=~((1<<ISC00)|((1<<ISC01)));
+	GICR = (1<<INT0);
+	DDRC |= (1<<PC2);
+	PORTC|=(1<<PC2);
+	_delay_ms(500);
+	PORTC&=~(1<<PC2);
+
+	set_dutycycle(0);
+	screen_clear();
+	set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+	sleep_enable();
+	sleep_cpu();
+	sleep_disable();
+	_delay_ms(100);
+	screen_clear();
+	set_dutycycle(50);
+	GICR &= ~(1<<INT0);
+}
diff --git a/peripheral_drivers/sleep/at_sleep.h b/peripheral_drivers/sleep/at_sleep.h
new file mode 100644
index 0000000..3b8b9b2
--- /dev/null
+++ b/peripheral_drivers/sleep/at_sleep.h
@@ -0,0 +1,12 @@
+#ifndef AT_SLEEP_H
+#define AT_SLEEP_H
+
+#include "../../config.h"
+#include<avr/io.h>
+#include<avr/interrupt.h>
+#include<avr/sleep.h>
+#include<util/delay.h>
+#include "../../device_drivers/screen/screen.h"
+void goto_sleep(void);
+
+#endif
diff --git a/utils/utils.h b/utils/utils.h
index 5368cca..315ce22 100644
--- a/utils/utils.h
+++ b/utils/utils.h
@@ -1,8 +1,10 @@
 #ifndef UTILS_H
 #define UTILS_H
 
+#include "../config.h"
 #include<avr/io.h>
 
+
 void strcut(char* , char* ,uint8_t ,uint8_t);
 
 #endif