diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b5a1c5..29a695a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,9 +22,10 @@ add_executable(zavlaha
     src/lcd/lcdbuf.c
     src/screens/app_gui.c
     src/screens/screen_home.c
+    src/screens/screen_settings.c
+    src/screens/screen_cyklus.c
     src/app_io.c
-    src/app_config.c
-    src/screens/screen_cyklus.c)
+    src/app_config.c)
 
 # Add pico_stdlib library which aggregates commonly used features
 target_link_libraries(zavlaha pico_stdlib hardware_i2c hardware_adc hardware_irq)
diff --git a/src/app_config.c b/src/app_config.c
index 11a3cee..2b280b9 100644
--- a/src/app_config.c
+++ b/src/app_config.c
@@ -2,20 +2,58 @@
  * TODO file description
  */
 
+#include <string.h>
+#include <stdio.h>
 #include "app_config.h"
+#include "ee.h"
+
+#define APPCONFIG_EE_BASE_ADDR 0
 
 // TODO sensible defaults, loading and saving to/from EE
-struct AppConfig app_config = {
+struct AppConfig app_config;
+
+static const struct AppConfig DEFAULTS = {
         .circuit_base_time_s = 10, // for a test
         .circuit_time_percent = {30, 60, 90, 100}, // for a test
         .schedules = {
-                {6, 45},
-                {255, 0},
-                {255, 0},
-                {255, 0}
+                {true, 6, 45},
+                {false, 255, 0},
+                {false, 255, 0},
+                {false, 255, 0}
         },
         .moisture_enable = true,
         .moisture_dry = 2800,
         .moisture_wet = 1600,
         .moisture_threshold_percent = 70,
 };
+
+static void load_fallback_config() {
+    // Read failed, load defaults
+    memcpy(&app_config, &DEFAULTS, sizeof(struct AppConfig));
+}
+
+void appconfig_load()
+{
+    uint8_t magic = 0;
+    if (0 != ee_read(APPCONFIG_EE_BASE_ADDR, &magic, 1) || magic != APPCONFIG_VERSION) {
+        printf("Couldn't read EE to check magic!\r\n");
+        load_fallback_config();
+        return;
+    }
+
+    if (0 != ee_read(APPCONFIG_EE_BASE_ADDR, (uint8_t *) &app_config, APPCONFIG_SIZE)) {
+        printf("Couldn't read EE to load config!\r\n");
+        load_fallback_config();
+    }
+}
+
+void appconfig_save()
+{
+    printf("PERSISTENCE DISABLED - NOT SAVING\r\n");
+    return; // FIXME - when all GUIs are finished, add persistence
+
+    // whatever, just write everything
+    if (0 != ee_write(APPCONFIG_EE_BASE_ADDR, (const uint8_t *) &app_config, APPCONFIG_SIZE)) {
+        printf("Couldn't write EE!");
+    }
+}
diff --git a/src/app_config.h b/src/app_config.h
index 7eb28fd..f0878ef 100644
--- a/src/app_config.h
+++ b/src/app_config.h
@@ -11,23 +11,32 @@
 #define CIRCUIT_COUNT 4
 #define SCHEDULE_COUNT 4
 
-#define UNUSED_SCHEDULE_HOUR 0xFF
-
-struct ScheduleTime {
+struct  __attribute__((packed)) ScheduleTime {
+  bool enable;
   uint8_t h;
   uint8_t m;
 };
 
-struct AppConfig {
+struct  __attribute__((packed)) AppConfig {
+  uint8_t magic_version;
   uint16_t circuit_base_time_s;
   uint8_t circuit_time_percent[CIRCUIT_COUNT]; // 0% can be used to disable a branch
-  struct ScheduleTime schedules[SCHEDULE_COUNT]; // 0xFF hour is used to disable the slot
+  bool scheduler_enable;
+  struct ScheduleTime schedules[SCHEDULE_COUNT];
   bool moisture_enable;
   uint16_t moisture_dry;
   uint16_t moisture_wet;
   uint8_t moisture_threshold_percent;
 };
 
+#define APPCONFIG_SIZE sizeof(struct AppConfig)
+
+#define APPCONFIG_VERSION 0b11100001
+
 extern struct AppConfig app_config;
 
+void appconfig_load();
+
+void appconfig_save();
+
 #endif //ZAVLAHA_APP_CONFIG_H
diff --git a/src/lcd/cgram.c b/src/lcd/cgram.c
index ce7df59..b8e4831 100644
--- a/src/lcd/cgram.c
+++ b/src/lcd/cgram.c
@@ -499,11 +499,11 @@ const struct LcdBuf_CGRAM_Symbol CGRAM_CZ[] = {
                 .fallback = '*',
                 .data = {
                         0b11111,
+                        0b11011,
                         0b01010,
                         0b10001,
-                        0b00000,
-                        0b10001,
                         0b01010,
+                        0b11011,
                         0b11111,
                 },
         },
diff --git a/src/lcd/cgrom.c b/src/lcd/cgrom.c
index 3874cd4..7ff0b4b 100644
--- a/src/lcd/cgrom.c
+++ b/src/lcd/cgrom.c
@@ -97,8 +97,8 @@ const struct LcdBuf_CGROM_Entry CGROM_A00[] = {
         {.address = 123, .symbol = "{"},
         {.address = 124, .symbol = "|"},
         {.address = 125, .symbol = "}"},
-        {.address = 126, .symbol = "←"},
-        {.address = 127, .symbol = "→"},
+        {.address = 126, .symbol = "→"},
+        {.address = 127, .symbol = "←"},
 
         // lots of japanese symbols - add them yourself if you need them
         {.address = 0xA2, .symbol = "「"},
diff --git a/src/main.c b/src/main.c
index 2e7fc2d..64fc2b9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,6 +11,7 @@
 #include "ee.h"
 #include "lcd/lcdbuf.h"
 #include "screens/app_gui.h"
+#include "app_config.h"
 
 /*
 
@@ -71,7 +72,7 @@ void irq_uart() {
     }
 }
 
-int main()
+int __attribute__((noreturn)) main()
 {
     // picotool binary info
     bi_decl(bi_1pin_with_name(PIN_LED, "LED"));
@@ -123,11 +124,14 @@ int main()
     adc_init();
     adc_gpio_init(PIN_MOISTURE);
 
+    appconfig_load();
+
     lcd_init();
 
     gui_init();
 
     for(;;) {
+        // Check if any key was pushed
         uint32_t interrupts = save_and_disable_interrupts();
         GuiEvent event = GUI_EVENT_NONE;
         if (keypad_buffer[keypad_buffer_rp] != 0) {
@@ -142,6 +146,8 @@ int main()
         restore_interrupts(interrupts);
 
         gui_loop_iter(event);
+
+        // TODO scheduler logic
     }
 
 //
diff --git a/src/screens/app_gui.c b/src/screens/app_gui.c
index 633ecca..df06bdd 100644
--- a/src/screens/app_gui.c
+++ b/src/screens/app_gui.c
@@ -62,6 +62,11 @@ void gui_loop_iter(GuiEvent message) {
 /** Switch to a different screen handler.
  * If "init" is true, immediately call it with the init event. */
 void switch_screen(screen_t pScreen, bool init) {
+    if (s_app.screen == pScreen) {
+        // already, no op
+        return;
+    }
+
     s_app.screen = pScreen;
 
     LcdBuffer_Clear(&lcd);
diff --git a/src/screens/app_gui.h b/src/screens/app_gui.h
index c81b0b9..52f0f5d 100644
--- a/src/screens/app_gui.h
+++ b/src/screens/app_gui.h
@@ -49,6 +49,7 @@ void request_paint();
 
 void screen_home(GuiEvent event);
 void screen_cyklus(GuiEvent event);
+void screen_settings(GuiEvent event);
 // XXX other prototypes
 
 struct State {
diff --git a/src/screens/screen_cyklus.c b/src/screens/screen_cyklus.c
index 6a4cec5..8403a50 100644
--- a/src/screens/screen_cyklus.c
+++ b/src/screens/screen_cyklus.c
@@ -12,6 +12,8 @@
 #include "ds_rtc.h"
 #include "app_io.h"
 
+// TODO
+
 
 void screen_cyklus(GuiEvent event)
 {
diff --git a/src/screens/screen_home.c b/src/screens/screen_home.c
index 133f26c..6f340ef 100644
--- a/src/screens/screen_home.c
+++ b/src/screens/screen_home.c
@@ -16,7 +16,6 @@ static uint32_t last_time = 0;
 static struct rtc_time rtc_time = {};
 static uint16_t moisture = 0;
 
-static char showbuf[20];
 static uint8_t showbuf_wp = 0;
 
 void screen_home(GuiEvent event)
@@ -26,7 +25,6 @@ void screen_home(GuiEvent event)
 
     switch (event) {
         case GUI_EVENT_SCREEN_INIT:
-            memset(showbuf, ' ', sizeof(showbuf));
             // pass
         case GUI_EVENT_SCREEN_TICK:
             if (elapsed >= 100) {
@@ -37,9 +35,8 @@ void screen_home(GuiEvent event)
             }
             break;
 
-        case GUI_EVENT_PAINT:
-            LcdBuffer_Write(&lcd, 0, 0, showbuf);
-
+        case GUI_EVENT_PAINT:;
+            // TODO
             uint32_t moisture_pt = ((uint32_t)(moisture > 2800 ? 0 : (2800 - moisture)) * 100) / (2800 - 1600);
 
             sprintf(stmp, " %2d:%02d:%02d    %3d%% 🌢 ", rtc_time.hour, rtc_time.minute, rtc_time.second, moisture_pt);
@@ -48,17 +45,11 @@ void screen_home(GuiEvent event)
             LcdBuffer_Write(&lcd, 1, 0, "Plán. závlaha 7:15");
             LcdBuffer_Write(&lcd, 2, 0, "❶Spustit ❷Přeskočit");
             LcdBuffer_Write(&lcd, 3, 0, "🅰Nastavení");
-
-//            LcdBuffer_Write(&lcd, 1, 0, "❶ Spustit cyklus");
-//            LcdBuffer_Write(&lcd, 2, 0, "❷ Ruční řízení");
-//            LcdBuffer_Write(&lcd, 3, 0, "🅰 Nastavení");
-
-//            LcdBuffer_Write(&lcd, 1, 0, "🅰Program  🅱Poměry");
-//            LcdBuffer_Write(&lcd, 2, 0, "🅲Vlhkoměr 🅳Čas");
             break;
 
         case GUI_EVENT_KEY_1:
-            switch_screen(screen_cyklus, true);
+            // TODO
+            switch_screen(screen_cyklus, true); // fake cycle
             break;
 
         case GUI_EVENT_KEY_2:
@@ -66,16 +57,7 @@ void screen_home(GuiEvent event)
             break;
 
         case GUI_EVENT_KEY_A:
-            // TODO
+            switch_screen(screen_settings, true);
             break;
-
-        default:
-            if (event >= 32) {
-                showbuf[showbuf_wp++] = event;
-                if (showbuf_wp == 20) {
-                    showbuf_wp = 0;
-                }
-                request_paint();
-            }
     }
 }
diff --git a/src/screens/screen_settings.c b/src/screens/screen_settings.c
new file mode 100644
index 0000000..82dc8e9
--- /dev/null
+++ b/src/screens/screen_settings.c
@@ -0,0 +1,144 @@
+/**
+ * TODO file description
+ */
+//
+// Created by MightyPork on 2023/04/09.
+//
+
+#include <stdio.h>
+#include <string.h>
+#include "app_gui.h"
+#include "gui_event.h"
+#include "ds_rtc.h"
+#include "app_io.h"
+#include "app_config.h"
+
+static int page = 1;
+
+#define PAGECOUNT 3
+
+static struct AppConfig scratch;
+
+/** Clear the top 3 lines in the LCD - this fixes some problems with utf8 allocations
+ * (char still held by a line later overwritten) */
+static void clear_menu_lines();
+
+void screen_settings(GuiEvent event)
+{
+    char buf[100];
+    switch (event) {
+        case GUI_EVENT_SCREEN_INIT:
+            page = 1;
+            memcpy(&scratch, &app_config, APPCONFIG_SIZE);
+            break;
+
+        case GUI_EVENT_PAINT:
+            switch (page) {
+                case 1:
+                    snprintf(buf, 100, "1. Program=%s", scratch.scheduler_enable ? "ZAP" : "VYP");
+                    LcdBuffer_Write(&lcd, 0, 0, buf);
+                    LcdBuffer_Write(&lcd, 1, 0, "2. Upravit program");
+                    LcdBuffer_Write(&lcd, 2, 0, "3. Nastavit čas");
+                    break;
+
+                case 2:
+                    LcdBuffer_Write(&lcd, 0, 0, "1. Délka zálivky");
+                    LcdBuffer_Write(&lcd, 1, 0, "2. Kompenzace tlaku");
+                    break;
+
+                case 3:
+                    snprintf(buf, 100, "1. Blok.vlhkostí=%s", scratch.moisture_enable ? "ZAP" : "VYP");
+                    LcdBuffer_Write(&lcd, 0, 0, buf);
+                    LcdBuffer_Write(&lcd, 1, 0, "2. Kalibrace vlhkom.");
+                    LcdBuffer_Write(&lcd, 2, 0, "3. Nastavit práh");
+                    break;
+            }
+
+            snprintf(buf, 100, "⊛←%d/%d→¤ 🅰Ulož 🅳Zruš", page, PAGECOUNT);
+            LcdBuffer_Write(&lcd, 3, 0, buf);
+            break;
+
+        case GUI_EVENT_KEY_B:
+        case GUI_EVENT_KEY_STAR:
+            if (page > 1) {
+                page--;
+                clear_menu_lines();
+                request_paint();
+            }
+            break;
+
+        case GUI_EVENT_KEY_C:
+        case GUI_EVENT_KEY_HASH:
+            if (page < PAGECOUNT) {
+                page++;
+                clear_menu_lines();
+                request_paint();
+            }
+            break;
+
+        case GUI_EVENT_KEY_A: // SAVE
+            memcpy(&app_config, &scratch, APPCONFIG_SIZE);
+            appconfig_save();
+            switch_screen(screen_home, true);
+            break;
+
+        case GUI_EVENT_KEY_D: // CANCEL
+            switch_screen(screen_home, true);
+            break;
+
+        default:
+            switch (page) {
+                case 1:
+                    switch (event) {
+                        case GUI_EVENT_KEY_1: // Program Zap/VYP
+                            scratch.scheduler_enable ^= 1;
+                            request_paint();
+                            break;
+
+                        case GUI_EVENT_KEY_2: // Upravit program
+                            // TODO
+                            break;
+
+                        case GUI_EVENT_KEY_3: // Nastavit cas
+                            // TODO
+                            break;
+                    }
+                    break;
+
+                case 2:
+                    switch (event) {
+                        case GUI_EVENT_KEY_1: // Délka zálivky
+                            break;
+
+                        case GUI_EVENT_KEY_2: // Kompenzace tlaku
+                            // TODO
+                            break;
+                    }
+                    break;
+
+                case 3:
+                    switch (event) {
+                        case GUI_EVENT_KEY_1: // Blokace vlhkosti Zap/VYP
+                            scratch.moisture_enable ^= 1;
+                            request_paint();
+                            break;
+
+                        case GUI_EVENT_KEY_2: // Kalibrace vlhkomeru
+                            // TODO
+                            break;
+
+                        case GUI_EVENT_KEY_3: // Nastavit prah
+                            // TODO
+                            break;
+                    }
+                    break;
+            }
+    }
+}
+
+static void clear_menu_lines()
+{
+    LcdBuffer_Write(&lcd, 0, 0, "                    ");
+    LcdBuffer_Write(&lcd, 1, 0, "                    ");
+    LcdBuffer_Write(&lcd, 2, 0, "                    ");
+}