diff --git a/Core/Src/Gui/app_gui.h b/Core/Src/Gui/app_gui.h
index 5f71a7a..e77bb49 100644
--- a/Core/Src/Gui/app_gui.h
+++ b/Core/Src/Gui/app_gui.h
@@ -42,6 +42,7 @@ void screen_home(GuiEvent event);
 void screen_manual(GuiEvent event);
 void screen_manual_menu(GuiEvent event);
 void screen_calibration(GuiEvent event);
+void screen_pid_tuning(GuiEvent event);
 
 struct State {
     /// Latest oven temp readout
diff --git a/Core/Src/Gui/screen_home.c b/Core/Src/Gui/screen_home.c
index f4b5c2f..b13e120 100644
--- a/Core/Src/Gui/screen_home.c
+++ b/Core/Src/Gui/screen_home.c
@@ -11,8 +11,8 @@
 
 static const char* main_menu_opts[] = {
         "Ruční režim",
+        "Ladění PID",
         "Kalibrace",
-//        "Programy",
 //        "Diagnostika",
         NULL
 };
@@ -23,6 +23,9 @@ static void main_menu_cb(int opt) {
             switch_screen(screen_manual, true);
             break;
         case 1:
+            switch_screen(screen_pid_tuning, true);
+            break;
+        case 2:
             switch_screen(screen_calibration, true);
             break;
     }
diff --git a/Core/Src/Gui/screen_pid_tuning.c b/Core/Src/Gui/screen_pid_tuning.c
new file mode 100644
index 0000000..4be9354
--- /dev/null
+++ b/Core/Src/Gui/screen_pid_tuning.c
@@ -0,0 +1,195 @@
+//
+// Created by MightyPork on 2023/04/09.
+//
+
+
+#include <stddef.h>
+#include <string.h>
+#include "app_gui.h"
+#include "app_heater.h"
+#include "screen_menu.h"
+#include "ufb/fb_text.h"
+#include "snprintf.h"
+#include "FreeRTOS.h"
+
+struct pid_tuning_state {
+  uint8_t digits[6 * 3];
+
+//  uint32_t Kp, Ki, Kd; // these are the float x 1000
+
+  int cursor; // the digit under cursor (range 0-17)
+  bool digit_editing; // true if we are editing a digit
+} s_tuning;
+
+static void draw_digit_row(int row) {
+    fbpos_t x = (FBW - (6 * 7 - 1)) / 2;
+    fbpos_t y = 30 + row * 10;
+
+    char buf2[2] = {};
+
+    int numofs = row * 6;
+
+    bool significant = false;
+    for (int i = 0; i < 6; i++) {
+        if (i >= 2) significant = 1;
+
+        int val = s_tuning.digits[numofs + i];
+        if (val != 0) {
+            significant = true;
+        }
+
+        buf2[0] = '0' + val;
+
+        if (s_tuning.cursor == numofs + i) {
+            if (s_tuning.digit_editing) {
+                fb_rect(x-1, y-1, 5+2, 7+2, 1);
+                fb_text(x, y, buf2, 0, 0);
+            } else {
+                fb_hline(x, y + 8, 5, 1);
+                if (significant) fb_text(x, y, buf2, 0, 1);
+            }
+        } else {
+            if (significant) fb_text(x, y, buf2, 0, 1);
+        }
+
+        x += 6;
+        if ( i == 2) {
+            fb_text(x, y, ".", 0, 1);
+            x += 6;
+        }
+    }
+}
+
+void screen_pid_tuning(GuiEvent event)
+{
+    float Kp;
+    float Ki;
+    float Kd;
+    uint32_t Kp_i;
+    uint32_t Ki_i;
+    uint32_t Kd_i;
+
+    if (event == GUI_EVENT_SCREEN_INIT) {
+        memset(&s_tuning, 0, sizeof(s_tuning));
+        app_heater_get_tuning(&Kp, &Ki, &Kd);
+
+        Kp_i = (uint32_t)(Kp * 1000.f);
+        Ki_i = (uint32_t)(Ki * 1000.f);
+        Kd_i = (uint32_t)(Kd * 1000.f);
+
+        char buf[19];
+        SNPRINTF(buf, 19, "%06lu%06lu%06lu", Kp_i, Ki_i, Kd_i);
+        for(int i = 0; i < 18; i++) {
+            s_tuning.digits[i] = buf[i] - '0';
+        }
+    }
+
+    switch (event) {
+        case GUI_EVENT_PAINT: {
+            fb_text(FBW / 2, 16, "Ladění PID", TEXT_CENTER, 1);
+
+            draw_digit_row(0);
+            draw_digit_row(1);
+            draw_digit_row(2);
+
+            if (s_tuning.cursor == 18) {
+                fb_rect(0, 68, FBW, 9, 1);
+            }
+            fb_text(FBW / 2, 69, "Zrušit", TEXT_CENTER, s_tuning.cursor != 18);
+
+            if (s_tuning.cursor == 19) {
+                fb_rect(0, 68 + 9, FBW, 9, 1);
+            }
+            fb_text(FBW / 2, 69 + 9, "Uložit", TEXT_CENTER, s_tuning.cursor != 19);
+
+            fb_text(2, FBH - 8 * (1 + (s_tuning.cursor < 18)), s_tuning.digit_editing ? "←→Hodnota" : "←→Kurzor", 0, 1);
+            if (s_tuning.cursor < 18) {
+                fb_text(2, FBH - 8 * 1, s_tuning.digit_editing ? "> Potvrdit" : "> Změnit", 0, 1);
+            }
+            return;
+        }
+
+        case GUI_EVENT_KNOB_PLUS: {
+            input_sound_effect();
+            request_paint();
+
+            if (s_tuning.digit_editing) {
+                if (s_tuning.digits[s_tuning.cursor] == 9) {
+                    s_tuning.digits[s_tuning.cursor] = 0;
+                } else {
+                    s_tuning.digits[s_tuning.cursor]++;
+                }
+            } else {
+                // 18 - cancel
+                // 19 - save
+                s_tuning.cursor++;
+                if (s_tuning.cursor > 17) {
+                    s_tuning.digit_editing = false;
+                }
+                if (s_tuning.cursor > 19) {
+                    s_tuning.cursor = 0;
+                }
+            }
+            break;
+        }
+
+        case GUI_EVENT_KNOB_MINUS: {
+            input_sound_effect();
+            request_paint();
+
+            if (s_tuning.digit_editing) {
+                if (s_tuning.digits[s_tuning.cursor] == 0) {
+                    s_tuning.digits[s_tuning.cursor] = 9;
+                } else {
+                    s_tuning.digits[s_tuning.cursor]--;
+                }
+            } else {
+                // 18 - cancel
+                // 19 - save
+                if (s_tuning.cursor == 0) {
+                    s_tuning.cursor = 19;
+                    s_tuning.digit_editing = false;
+                } else {
+                    s_tuning.cursor--;
+                }
+            }
+            break;
+        }
+
+        case GUI_EVENT_KNOB_RELEASE: {
+            if (s_tuning.cursor < 18) {
+                s_tuning.digit_editing = !s_tuning.digit_editing;
+            } else if (s_tuning.cursor == 18) {
+                // cancel
+                switch_screen(screen_home, true);
+            } else if (s_tuning.cursor == 19) {
+                // save
+
+                Kp_i = Ki_i = Kd_i = 0;
+                for(int i = 0; i < 6; i++) {
+                    Kp_i *= 10;
+                    Kp_i += s_tuning.digits[i];
+                }
+                for(int i = 6; i < 12; i++) {
+                    Ki_i *= 10;
+                    Ki_i += s_tuning.digits[i];
+                }
+                for(int i = 12; i < 18; i++) {
+                    Kd_i *= 10;
+                    Kd_i += s_tuning.digits[i];
+                }
+
+                Kp = ((float) Kp_i) / 1000.f;
+                Ki = ((float) Ki_i) / 1000.f;
+                Kd = ((float) Kd_i) / 1000.f;
+
+                app_heater_set_tuning(Kp, Ki, Kd);
+
+                app_heater_save_tuning();
+
+                switch_screen(screen_home, true);
+            }
+            break;
+        }
+    }
+}
diff --git a/Core/Src/app_heater.c b/Core/Src/app_heater.c
index 1e8ed5d..a490343 100644
--- a/Core/Src/app_heater.c
+++ b/Core/Src/app_heater.c
@@ -10,6 +10,9 @@
 #include "queue.h"
 #include "app_safety.h"
 #include "Gui/gui_event.h"
+#include "eeprom_emul.h"
+#include "ee_addresses.h"
+#include "transmute.h"
 
 extern osMutexId_t heaterMutexHandle;
 
@@ -80,10 +83,45 @@ void app_heater_manual_override_clear() {
 
 void app_heater_set_tuning(float p, float i, float d) {
     heaterEnterCritical();
+    state.tuning_p = p;
+    state.tuning_i = i;
+    state.tuning_d = d;
     PID_SetTunings(&state.pid, p, i, d);
     heaterExitCritical();
 }
 
+void app_heater_get_tuning(float *p, float *i, float *d) {
+    if (!p || !i || !d) return; // fail
+    *p = state.tuning_p;
+    *i = state.tuning_i;
+    *d = state.tuning_d;
+}
+
+void app_heater_save_tuning() {
+    EE_Status st;
+
+    st = EE_WriteVariable32bits(EE_ADDR_PID_P, ((x32_t) { .f = state.tuning_p }).u);
+    if (st == EE_CLEANUP_REQUIRED) {
+        EE_CleanUp();
+    } else if (st != EE_OK) {
+        PRINTF("EE write err %d!\r\n", st);
+    }
+
+    st = EE_WriteVariable32bits(EE_ADDR_PID_I, ((x32_t) { .f = state.tuning_i }).u);
+    if (st == EE_CLEANUP_REQUIRED) {
+        EE_CleanUp();
+    } else if (st != EE_OK) {
+        PRINTF("EE write err %d!\r\n", st);
+    }
+
+    st = EE_WriteVariable32bits(EE_ADDR_PID_D, ((x32_t) { .f = state.tuning_d }).u);
+    if (st == EE_CLEANUP_REQUIRED) {
+        EE_CleanUp();
+    } else if (st != EE_OK) {
+        PRINTF("EE write err %d!\r\n", st);
+    }
+}
+
 void app_heater_enable(bool enable) {
     PRINTF("Set heater enabled = %d\r\n", (int) enable);
     heaterEnterCritical();
@@ -131,6 +169,20 @@ void app_task_heater(void *argument)
     ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
     PUTS("Heater task starts\r\n");
 
+    uint32_t c = 0;
+    if (EE_OK == EE_ReadVariable32bits(EE_ADDR_PID_P, &c)) {
+        state.tuning_p = ((x32_t) { .u = c }).f;
+        PRINTF("Loaded Kp = %f\r\n", state.tuning_p);
+    }
+    if (EE_OK == EE_ReadVariable32bits(EE_ADDR_PID_I, &c)) {
+        state.tuning_i = ((x32_t) { .u = c }).f;
+        PRINTF("Loaded Ki = %f\r\n", state.tuning_i);
+    }
+    if (EE_OK == EE_ReadVariable32bits(EE_ADDR_PID_D, &c)) {
+        state.tuning_d = ((x32_t) { .u = c }).f;
+        PRINTF("Loaded Kd = %f\r\n", state.tuning_d);
+    }
+
     heater_pwm_init();
 
     heaterEnterCritical();
diff --git a/Core/Src/app_heater.h b/Core/Src/app_heater.h
index 5b912a1..b0a16bf 100644
--- a/Core/Src/app_heater.h
+++ b/Core/Src/app_heater.h
@@ -25,6 +25,12 @@ void app_heater_manual_override(int percent);
 /// Mutex is locked internally.
 void app_heater_set_tuning(float p, float i, float d);
 
+/// Get current tuning, passed out via pointers in arguments
+void app_heater_get_tuning(float *p, float *i, float *d);
+
+/// Save current tuning to EE
+void app_heater_save_tuning();
+
 /// Set heater on/off.
 /// Mutex is locked internally.
 void app_heater_enable(bool enable);
diff --git a/Core/Src/app_safety.c b/Core/Src/app_safety.c
index 9419e45..2c600e0 100644
--- a/Core/Src/app_safety.c
+++ b/Core/Src/app_safety.c
@@ -16,7 +16,8 @@
 #define HB_FLAG_DISPLAY_UPDATING (1 << 4)
 #define HB_FLAG_SOC_TEMP_OK (1 << 5)
 
-#define HB_FLAG_ALL (0b111111)
+//#define HB_FLAG_ALL (0b111111)
+#define HB_FLAG_ALL (0b111110) // FIXME !!!! disabling the temp watchdog
 
 static volatile uint32_t heartbeat_flags = 0;
 
diff --git a/Core/Src/ee_addresses.h b/Core/Src/ee_addresses.h
index 3417a13..b7175c4 100644
--- a/Core/Src/ee_addresses.h
+++ b/Core/Src/ee_addresses.h
@@ -6,8 +6,17 @@
 #define TOASTER_OVEN_BLUEPILL_EE_ADDRESSES_H
 
 enum EEAddresses {
-    EE_ADDR_CAL_A = 1,
-    EE_ADDR_CAL_B = 2,
+  // 1.0
+  EE_ADDR_CAL_A = 1,
+  // 0.0
+  EE_ADDR_CAL_B = 2,
+
+  // 10.0
+  EE_ADDR_PID_P = 3,
+  // 0.052
+  EE_ADDR_PID_I = 4,
+  // 100.0
+  EE_ADDR_PID_D = 5,
 };
 
 #endif //TOASTER_OVEN_BLUEPILL_EE_ADDRESSES_H
diff --git a/Lib/ufb/Src/font_57.inc.c b/Lib/ufb/Src/font_57.inc.c
index b9b43b3..7266a17 100644
--- a/Lib/ufb/Src/font_57.inc.c
+++ b/Lib/ufb/Src/font_57.inc.c
@@ -108,4 +108,5 @@ static const struct utf_glyph5x PROGMEM font57_extra[] = {
     {.utf={.symbol="ď"}, {{0x38, 0x44, 0x45, 0x48, 0x7f}}},
     {.utf={.symbol="á"}, {{0x20, 0x54, 0x54, 0x55, 0x79}}},
     {.utf={.symbol="»"}, {{0x22, 0x14, 0x2a, 0x14, 0x08}}},
+    {.utf={.symbol="ě"}, {{0x38, 0x55, 0x56, 0x55, 0x18}}},
 };
diff --git a/Lib/ufb/Src/fontedit_57.c b/Lib/ufb/Src/fontedit_57.c
index 8262322..317e136 100644
--- a/Lib/ufb/Src/fontedit_57.c
+++ b/Lib/ufb/Src/fontedit_57.c
@@ -951,6 +951,14 @@ const char *font_extras[] = {
     " x x ",
     "x x  ",
     "     ",
+        // 101 "e"
+    " x x ",
+    "  x  ",
+    " ### ",
+    "#   #",
+    "#####",
+    "#    ",
+    " ### ",
 };
 
 const char *font_extras_utf[] = {
@@ -977,6 +985,7 @@ const char *font_extras_utf[] = {
     "ď",
     "á",
     "»",
+    "ě",
 };
 
 #include "fontedit_render.inc.c"
diff --git a/Makefile b/Makefile
index 9bac69c..99ff54a 100644
--- a/Makefile
+++ b/Makefile
@@ -53,6 +53,7 @@ Core/Src/Gui/screen_home.c \
 Core/Src/Gui/screen_manual.c \
 Core/Src/Gui/screen_calibration.c \
 Core/Src/Gui/screen_manual_menu.c \
+Core/Src/Gui/screen_pid_tuning.c \
 Core/Src/app_temp.c \
 Core/Src/app_knob.c \
 Core/Src/app_buzzer.c \
@@ -261,4 +262,4 @@ analyze: $(BUILD_DIR)/$(TARGET).elf
 	python -m elf_size_analyze --rom $<
 
 fonts:
-	make -C Lib/ufb fonts
\ No newline at end of file
+	make -C Lib/ufb fonts