diff --git a/adc.c b/adc.c
new file mode 100644
index 0000000..afd3824
--- /dev/null
+++ b/adc.c
@@ -0,0 +1,76 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "adc.h"
+
+void adc_init()
+{
+    ADMUX = 1 << REFS0 | 0 << REFS1; //Select external Vref
+
+    //ADC Status Register A
+    ADCSRA = 1 << ADEN   //Enable ADC
+             | 1 << ADIE //Enable ISR after conversion complete
+             //|  1<<ADATE //Freerunning-Mode
+             //|  1<<ADLAR //2 results bits are left aligned
+             | 1 << ADPS2 //Set clock-prescaler to 128
+             | 1 << ADPS1 | 1 << ADPS0;
+    ADCSRA |= 1 << ADSC; //Start first Conversion for "warmup"
+}
+
+void set_ADC_Channel(uint8_t adr)
+{
+    if (adr < 11)
+    {
+        ADMUX &= (0b11110000); //Clear MUX-Address
+        ADMUX |= adr;          //Set new MUX-Address
+    }
+}
+
+ISR(ADC_vect)
+{
+    //static uint8_t init[4] = {0,0,0,0};
+    static uint8_t current_channel = 0;
+
+    static uint16_t read_buffer[128];
+    static uint8_t buffer_pos = 0;
+
+
+    //Reading 10bit conversion result
+    uint16_t ADC_reading = ADCL;        //copy the first LSB bits
+    ADC_reading |= ADCH << 8;           //copy remaing byte
+
+    read_buffer[buffer_pos] = ADC_reading;
+    buffer_pos++;
+
+    if(buffer_pos == (sizeof(read_buffer) / sizeof(read_buffer[0]))){
+        uint32_t sum = 0;
+        for(uint8_t i = 0; i < buffer_pos; i++){
+            sum += read_buffer[i];
+        }
+        temp_values[current_channel] = sum/buffer_pos;
+
+        buffer_pos = 0;
+
+        current_channel++;
+        if(current_channel == 4)
+            current_channel = 0;
+        set_ADC_Channel(current_channel);
+    }
+
+    ADCSRA |= (1 << ADSC); //Start next conversion
+
+
+    //TODO write non broken adc code
+    //if(adc_buf[current_channel].position == BUFFER_SIZE-1){
+    //    //if(init[current_channel]){
+    //        //float tmp = (99*adc_avrg[current_channel]) + get_buffer_mean(&adc_buf[current_channel]);
+    //        //tmp /= 100;
+    //        adc_avrg[current_channel] = get_buffer_mean(&adc_buf[current_channel]);
+    //    //}
+    //    //else{
+    //    //    adc_avrg[current_channel] = get_buffer_mean(&adc_buf[current_channel]);
+    //    //    init[current_channel]=0;
+    //    //}
+    //}
+
+}
diff --git a/adc.h b/adc.h
new file mode 100644
index 0000000..bbd3146
--- /dev/null
+++ b/adc.h
@@ -0,0 +1,11 @@
+#ifndef _ADC_H_
+#define _ADC_H_
+
+#include <stdint.h>
+
+extern volatile uint16_t temp_values[4];
+
+void adc_init(void);
+
+#endif//_ADC_H_
+
diff --git a/main.c b/main.c
index 269adb4..ce0cef5 100644
--- a/main.c
+++ b/main.c
@@ -13,22 +13,23 @@
 #include "i2c.h"
 #include "modbus.h"
 #include "menu.h"
+#include "adc.h"
 
 volatile uint16_t holdingRegisters[10];
 
+volatile uint16_t temp_values[4];
+volatile uint16_t temp_setpoints[4];
+
 void modbusGet(void) {
 	if (modbusGetBusState() & (1<<ReceiveCompleted))
 	{
         switch(rxbuffer[1]) {
             case fcReadHoldingRegisters:
-                i2c_start(0x71);
-                holdingRegisters[0] = i2c_readNak();
-                i2c_stop();
+                holdingRegisters[0] = menu_state;
             case fcPresetSingleRegister:
             case fcPresetMultipleRegisters:
                 modbusExchangeRegisters(holdingRegisters,0,4);
-                lcd_set_position(holdingRegisters[1], holdingRegisters[2]);
-                lcd_write("test");
+                menu_state = holdingRegisters[0];
                 break;
             default:
                 modbusSendException(ecIllegalFunction);
@@ -38,29 +39,30 @@ void modbusGet(void) {
 }
 
 void do_buttons(){
-    //i2c_start(0x71);
-    //uint8_t buttons = i2c_readNak();
-    //i2c_stop();
-    ////TODO error handling
-
-    //if(buttons & (1 << 0))
-    //    set_item(1);
-    //else if(buttons & (1 << 1))
-    //    set_item(2);
-    //else if(buttons & (1 << 2))
-    //    set_item(2);
-    //else if(buttons & (1 << 2))
-    //    set_item(3);
-    //else if(buttons & (1 << 3))
-    //    set_item(4);
-    //else if(buttons & (1 << 4))
-    //    set_item(5);
+    i2c_start(0x71);
+    uint8_t buttons = i2c_readNak();
+    i2c_stop();
+    //TODO error handling
+
+    if(buttons & (1 << 0))
+        set_item(1);
+    else if(buttons & (1 << 1))
+        set_item(2);
+    else if(buttons & (1 << 2))
+        set_item(2);
+    else if(buttons & (1 << 2))
+        set_item(3);
+    else if(buttons & (1 << 3))
+        set_item(4);
+    else if(buttons & (1 << 4))
+        set_item(5);
 }
 
 int main(void)
 {
 	i2c_init();
 	lcd_init();
+    adc_init();
 	
 	lcd_clear();
 
@@ -71,14 +73,46 @@ int main(void)
     TCCR0B|=(1<<CS01); //prescaler 8
 	TIMSK0|=(1<<TOIE0);
 
+    PORTD |= (1<<6) | (1 << 7);
+    PCICR |= (1<<PCIE2);
+    PCMSK2 |= (1<<PCINT23);
+
     draw_menu();
 
+    uint16_t x = 0;
 	while(1){
         modbusGet();
         do_buttons();
+        if(x==0){
+            write_temps();
+            write_setpoints();
+            update_cursor();
+        }
+        x++;
+        if(x>=2024)
+            x=0;
 	}
 }
 
 ISR(TIMER0_OVF_vect) { //this ISR is called 9765.625 times per second
 	modbusTickTimer();
 }
+
+ISR(PCINT2_vect){
+    if((PIND & (1<<7)) && (menu_state >= 1) && (menu_state <= 3)){
+        if(PIND & (1<<6))
+            temp_setpoints[menu_state-1]++;
+        else
+            temp_setpoints[menu_state-1]--;
+    }
+
+
+
+    //if(PIND & (1<<7))
+    //    if(PIND & (1<<6)){
+    //        if(temp_setpoints[menu_state] > 0)
+    //    }
+    //    else{
+    //        if(temp_setpoints[menu_state] < 300)
+    //    }
+}
diff --git a/makefile b/makefile
index 53488e8..6f963ed 100644
--- a/makefile
+++ b/makefile
@@ -1,5 +1,5 @@
 TARGET  = main
-FILES   = main i2c lcd modbus menu
+FILES   = main i2c lcd modbus menu adc
 MCU     = atmega328p
 PROGC	= m328p
 CC      = avr-gcc
diff --git a/menu.c b/menu.c
index 6dec3f3..70a93c7 100644
--- a/menu.c
+++ b/menu.c
@@ -1,4 +1,12 @@
 #include "lcd.h"
+#include "menu.h"
+#include <stdio.h>
+
+// 0 = nothing selected
+// 1 = change zone 1
+// 2 = change zone 2
+// 3 = change zone 3
+volatile uint8_t menu_state = 0;
 
 void write_heater_real_temp(uint8_t n, uint16_t temp){
 
@@ -8,6 +16,26 @@ void write_heater_set_temp(uint8_t n, uint16_t temp){
 
 }
 
+void update_cursor(){
+    switch(menu_state){
+        case 1:
+            lcd_set_position(2,6);
+            lcd_cursor(1); 
+            break;
+        case 2:
+            lcd_set_position(2,11);
+            lcd_cursor(1); 
+            break;
+        case 3:
+            lcd_set_position(2,16);
+            lcd_cursor(1); 
+            break;
+        default:
+            lcd_cursor(0); 
+            break;
+    }
+}
+
 void draw_menu(){
 	lcd_clear();
     lcd_write(" Heat Zone Control");
@@ -15,11 +43,47 @@ void draw_menu(){
     lcd_write(" set:");
     lcd_set_position(3, 0);
     lcd_write("real:");
+    //char str[16];
+    //sprintf(str, "test %d", 1);
+    //lcd_print_str(str);
+}
+
+void write_temps(){
+    char str[4];
+
+    lcd_set_position(3, 6);
+    sprintf(str, "%3i", temp_values[0]);
+    lcd_print_str(str);
+
+    lcd_set_position(3, 11);
+    sprintf(str, "%3i", temp_values[1]);
+    lcd_print_str(str);
+
+    lcd_set_position(3, 16);
+    sprintf(str, "%3d", temp_values[2]);
+    lcd_print_str(str);
+}
+
+void write_setpoints(){
+    char str[4];
+
+    lcd_set_position(2, 6);
+    sprintf(str, "%3i", temp_setpoints[0]);
+    lcd_print_str(str);
+
+    lcd_set_position(2, 11);
+    sprintf(str, "%3i", temp_setpoints[1]);
+    lcd_print_str(str);
+
+    lcd_set_position(2, 16);
+    sprintf(str, "%3i", temp_setpoints[2]);
+    lcd_print_str(str);
 }
 
 void set_item(uint8_t page_num){
-	lcd_clear();
-    lcd_home();
-    lcd_write("page %x", page_num);
+    //if(menu_state=page_num)
+    //    menu_state=0;
+    //else
+        menu_state = page_num;
 }
 
diff --git a/menu.h b/menu.h
index 3b51323..3ca17d0 100644
--- a/menu.h
+++ b/menu.h
@@ -1,7 +1,15 @@
 #ifndef _MENU_H_
 #include <stdint.h>
 
-void set_page(uint8_t page_num);
+extern volatile uint8_t menu_state;
+
+extern volatile uint16_t temp_values[4];
+extern volatile uint16_t temp_setpoints[4];
+
+void write_temps(void);
+void write_setpoints(void);
+void update_cursor(void);
+void set_item(uint8_t page_num);
 void draw_menu(void);
 
 #endif