diff --git a/F3:F303/NitrogenFlooding/BMP280.c b/F3:F303/NitrogenFlooding/BMP280.c
index 4770a2b..7cf963d 100644
--- a/F3:F303/NitrogenFlooding/BMP280.c
+++ b/F3:F303/NitrogenFlooding/BMP280.c
@@ -359,6 +359,6 @@ int BMP280_getdata(float *T, float *P, float *H){
 
 // dewpoint calculation (T in degrC, H in percents)
 float Tdew(float T, float H){
-    float gamma = 17.27f * T / (237.7f + T) + log(H/100.f);
+    float gamma = 17.27f * T / (237.7f + T) + logf(H/100.f);
     return (237.7f * gamma)/(17.27 - gamma);
 }
diff --git a/F3:F303/NitrogenFlooding/buttons.c b/F3:F303/NitrogenFlooding/buttons.c
new file mode 100644
index 0000000..a1a0231
--- /dev/null
+++ b/F3:F303/NitrogenFlooding/buttons.c
@@ -0,0 +1,90 @@
+/*
+ * This file is part of the nitrogen project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "buttons.h"
+#include "hardware.h"
+
+typedef struct{
+    keyevent event;         // current key event
+    int16_t counter;        // press/release counter
+    uint32_t lastTms;       // time of last event change
+} keybase;
+
+static keybase allkeys[BTNSNO] = {0}; // array for buttons' states
+
+uint32_t lastUnsleep = 0; // last keys activity time
+
+void process_keys(){
+    static uint32_t lastT = 0;
+    if(Tms == lastT) return;
+    uint16_t d = (uint16_t)(Tms - lastT);
+    lastT = Tms;
+    for(int i = 0; i < BTNSNO; ++i){
+        keybase *k = &allkeys[i];
+        keyevent e = k->event;
+        if(BTN_state(i)){ // key is in pressed state
+            switch(e){
+                case EVT_NONE: // just pressed
+                case EVT_RELEASE:
+                    if((k->counter += d) > PRESSTHRESHOLD){
+                        k->event = EVT_PRESS;
+                    }
+                break;
+                case EVT_PRESS: // hold
+                    if((k->counter += d)> HOLDTHRESHOLD){
+                        k->event = EVT_HOLD;
+                    }
+                break;
+                default:
+                break;
+            }
+        }else{ // released
+            if(e == EVT_PRESS || e == EVT_HOLD){ // released
+                if(k->counter > PRESSTHRESHOLD) k->counter = PRESSTHRESHOLD;
+                else if((k->counter -= d) < 0){
+                    k->event = EVT_RELEASE; // button released
+                }
+            }
+        }
+        if(e != k->event){
+            k->lastTms = Tms;
+            lastUnsleep = Tms;
+        }
+    }
+}
+
+/**
+ * @brief keystate - curent key state
+ * @param k   - key number
+ * @param T   - last event changing time
+ * @return key event
+ */
+keyevent keystate(uint8_t k, uint32_t *T){
+    if(k >= BTNSNO) return EVT_NONE;
+    keyevent evt = allkeys[k].event;
+    // change state `release` to `none` after 1st check
+    if(evt == EVT_RELEASE) allkeys[k].event = EVT_NONE;
+    if(T) *T = allkeys[k].lastTms;
+    return evt;
+}
+
+// getter of keyevent for allkeys[]
+keyevent keyevt(uint8_t k){
+    if(k >= BTNSNO) return EVT_NONE;
+    return allkeys[k].event;
+}
diff --git a/F3:F303/NitrogenFlooding/buttons.h b/F3:F303/NitrogenFlooding/buttons.h
new file mode 100644
index 0000000..f981e30
--- /dev/null
+++ b/F3:F303/NitrogenFlooding/buttons.h
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the nitrogen project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stm32f3.h>
+
+// threshold in ms for press/hold
+#define PRESSTHRESHOLD  (9)
+#define HOLDTHRESHOLD   (199)
+
+// events
+typedef enum{
+    EVT_NONE,   // no events with given key
+    EVT_PRESS,  // pressed (hold more than PRESSTHRESHOLD ms)
+    EVT_HOLD,   // hold more than HOLDTHRESHOLD ms
+    EVT_RELEASE // released after press or hold state
+} keyevent;
+
+extern uint32_t lastUnsleep; // last keys activity time
+
+void process_keys();
+keyevent keystate(uint8_t k, uint32_t *T);
+keyevent keyevt(uint8_t k);
+
diff --git a/F3:F303/NitrogenFlooding/hardware.c b/F3:F303/NitrogenFlooding/hardware.c
index e31aefa..1ba7ef6 100644
--- a/F3:F303/NitrogenFlooding/hardware.c
+++ b/F3:F303/NitrogenFlooding/hardware.c
@@ -20,7 +20,7 @@
 #include "i2c.h"
 #include "spi.h"
 
-int LEDsON = 1;
+int LEDsON = 0;
 
 // setup here ALL GPIO pins (due to table in Readme.md)
 // leave SWD as default AF; high speed for CLK and some other AF; med speed for some another AF
@@ -161,7 +161,7 @@ void setPWM(int nch, uint16_t val){
     }
 }
 
-uint8_t getPWM(int nch){
+uint16_t getPWM(int nch){
     switch(nch){
         case 0:
             return TIM3->CCR1;
diff --git a/F3:F303/NitrogenFlooding/hardware.h b/F3:F303/NitrogenFlooding/hardware.h
index bfbbaa2..fe872fc 100644
--- a/F3:F303/NitrogenFlooding/hardware.h
+++ b/F3:F303/NitrogenFlooding/hardware.h
@@ -48,16 +48,18 @@
 #define LED_off(x)  do{pin_set(LEDs_port, 1<<(8+x));}while(0)
 #define LED_on(x)  do{if(LEDsON) pin_clear(LEDs_port, 1<<(8+x));}while(0)
 #define LED_get(x)  (LEDs_port->IDR & 1<<(8+x) ? 0 : 1)
+#define LEDS_OFF()  do{LEDsON = 0; for(int _ = 0; _ < 4; ++_) LED_off(_);}while(0)
+#define LEDS_ON()   do{LEDsON = 1;}while(0)
 
 // screen LEDon/off - PB12; reset - PB11; data/command - PB10
 #define SCRN_LED_pin    (1<<12)
 #define SCRN_LED_port   (GPIOB)
 #define SCRN_LED_set(a) do{if(a) pin_set(SCRN_LED_port, SCRN_LED_pin); else pin_clear(SCRN_LED_port, SCRN_LED_pin);}while(0)
 #define SCRN_LED_get()  (SCRN_LED_port->IDR & SCRN_LED_pin ? 1: 0)
-#define SCRN_RST_pin    (1<<11)
-#define SCRN_RST_port   (GPIOB)
-#define SCRN_RST_set(a) do{if(a) pin_set(SCRN_RST_port, SCRN_RST_pin); else pin_clear(SCRN_RST_port, SCRN_RST_pin);}while(0)
-#define SCRN_RST_get()  (SCRN_RST_port->IDR & SCRN_RST_pin ? 1: 0)
+#define SCRN_CS_pin     (1<<11)
+#define SCRN_CS_port    (GPIOB)
+#define SCRN_CS_set(a)  do{if(a) pin_set(SCRN_CS_port, SCRN_CS_pin); else pin_clear(SCRN_CS_port, SCRN_CS_pin);}while(0)
+#define SCRN_CS_get()  (SCRN_CS_port->IDR & SCRN_CS_pin ? 1: 0)
 #define SCRN_DCX_pin    (1<<10)
 #define SCRN_DCX_port   (GPIOB)
 #define SCRN_DCX_get()  (SCRN_DCX_port->IDR & SCRN_DCX_pin ? 1: 0)
@@ -77,6 +79,10 @@
 #define BTN6_pin    (1<<15)
 // state 0 - pressed, 1 - released
 #define BTN_state(x)    (BTNs_port->IDR & 1<<(9+x) ? 0 : 1)
+// timeout to turn off screen and LEDs after no keys activity - 300 seconds
+#define BTN_ACTIVITY_TIMEOUT    (300000)
+// refresh interval for BME280 and other data  - 2.5s
+#define SENSORS_DATA_TIMEOUT    (2500)
 
 // buzzer, ADC voltage
 #define BUZZER_port     GPIOB
@@ -96,4 +102,4 @@ uint8_t MSB(uint16_t val);
 void hw_setup();
 
 void setPWM(int nch, uint16_t val);
-uint8_t getPWM(int nch);
+uint16_t getPWM(int nch);
diff --git a/F3:F303/NitrogenFlooding/ili9341.c b/F3:F303/NitrogenFlooding/ili9341.c
index beaac7a..8e92f4d 100644
--- a/F3:F303/NitrogenFlooding/ili9341.c
+++ b/F3:F303/NitrogenFlooding/ili9341.c
@@ -79,6 +79,22 @@ int ili9341_init(){
     return 1;
 }
 
+// turn screen ON of OFF
+int ili9341_on(){
+    SCRN_LED_set(1);
+    if(!ili9341_writecmd(ILI9341_SLPOUT)) return 0;
+    if(!ili9341_writecmd(ILI9341_NORON)) return 0;
+    if(!ili9341_writecmd(ILI9341_DISPON)) return 0;
+    return 1;
+}
+
+int ili9341_off(){
+    SCRN_LED_set(0);
+    if(!ili9341_writecmd(ILI9341_SLPIN)) return 0;
+    if(!ili9341_writecmd(ILI9341_DISPOFF)) return 0;
+    return 1;
+}
+
 /**
  * @brief il9341_readreg - read data from register
  * @param reg - register
@@ -88,7 +104,7 @@ int ili9341_init(){
  */
 int ili9341_readreg(uint8_t reg, uint8_t *data, uint32_t N){
     SCRN_Command();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     int r = 0;
     do{
         if(!spi_write(&reg, 1)) break;
@@ -99,7 +115,7 @@ int ili9341_readreg(uint8_t reg, uint8_t *data, uint32_t N){
         r = 1;
     }while(0);
     SCRN_Command();
-    SCRN_RST_set(1);
+    SCRN_CS_set(1);
     return r;
 }
 
@@ -112,7 +128,7 @@ int ili9341_readreg(uint8_t reg, uint8_t *data, uint32_t N){
  */
 int ili9341_writereg(uint8_t reg, const uint8_t *data, uint32_t N){
     SCRN_Command();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     int r = 0;
     do{
         if(!spi_write(&reg, 1)) break;
@@ -123,14 +139,14 @@ int ili9341_writereg(uint8_t reg, const uint8_t *data, uint32_t N){
         r = 1;
     }while(0);
     SCRN_Command();
-    SCRN_RST_set(1);
+    SCRN_CS_set(1);
     return r;
 }
 
 // write register with uint16_t data (swap bytes)
 int ili9341_writereg16(uint8_t reg, const uint16_t data){
     SCRN_Command();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     int r = 0;
     do{
         if(!spi_write(&reg, 1)) break;
@@ -142,13 +158,13 @@ int ili9341_writereg16(uint8_t reg, const uint16_t data){
         r = 1;
     }while(0);
     SCRN_Command();
-    SCRN_RST_set(1);
+    SCRN_CS_set(1);
     return r;
 }
 
 int ili9341_writereg32(uint8_t reg, uint16_t data1, uint16_t data2){
     SCRN_Command();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     int r = 0;
     do{
         if(!spi_write(&reg, 1)) break;
@@ -162,21 +178,21 @@ int ili9341_writereg32(uint8_t reg, uint16_t data1, uint16_t data2){
         r = 1;
     }while(0);
     SCRN_Command();
-    SCRN_RST_set(1);
+    SCRN_CS_set(1);
     return r;
 }
 
 // write simple command
 int ili9341_writecmd(uint8_t cmd){
     SCRN_Command();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     int r = 0;
     do{
         if(!spi_write(&cmd, 1)) break;
         if(!spi_waitbsy()) break;
         r = 1;
     }while(0);
-    SCRN_RST_set(1);
+    SCRN_CS_set(1);
     return r;
 }
 
@@ -185,7 +201,7 @@ static int dmardwr(uint8_t *out, uint8_t *in, uint32_t N){
     if(!out || !N) return 0;
     if(in) bzero(out, N);
     SCRN_Data();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     uint32_t r = 0;
     do{
         if(!spi_write_dma((const uint8_t*)out, in, N)) break;
@@ -197,7 +213,7 @@ static int dmardwr(uint8_t *out, uint8_t *in, uint32_t N){
         else r = 1;
     }while(0);
     SCRN_Command();
-    SCRN_RST_set(1);
+    SCRN_CS_set(1);
     return r;
 }
 
@@ -214,7 +230,7 @@ int ili9341_readdata(uint8_t *data, uint32_t N){
 
 int ili9341_readregdma(uint8_t reg, uint8_t *data, uint32_t N){
     SCRN_Command();
-    SCRN_RST_set(0);
+    SCRN_CS_set(0);
     int r = 0;
     do{
         if(!spi_write(&reg, 1)) break;
diff --git a/F3:F303/NitrogenFlooding/ili9341.h b/F3:F303/NitrogenFlooding/ili9341.h
index ae5627e..853001d 100644
--- a/F3:F303/NitrogenFlooding/ili9341.h
+++ b/F3:F303/NitrogenFlooding/ili9341.h
@@ -173,6 +173,8 @@
 extern uint16_t colorbuf[];
 
 int ili9341_init();
+int ili9341_on();
+int ili9341_off();
 int ili9341_readreg(uint8_t reg, uint8_t *data, uint32_t N);
 int ili9341_writereg(uint8_t reg, const uint8_t *data, uint32_t N);
 int ili9341_writereg16(uint8_t reg, uint16_t data);
diff --git a/F3:F303/NitrogenFlooding/incication.h b/F3:F303/NitrogenFlooding/incication.h
new file mode 100644
index 0000000..afbf7a2
--- /dev/null
+++ b/F3:F303/NitrogenFlooding/incication.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the nitrogen project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+// temporary defines - should be stored in settings
+// temperature (degC) limits
+#define T_MIN       (-20.f)
+#define T_MAX       (40.f)
+// pressure (Pa) limit
+#define P_MAX       (120e3f)
+// humidity limit
+#define H_MAX       (90.f)
+// minimal difference above dew point
+#define DEW_MIN     (3.f)
+
+void indication_process();
diff --git a/F3:F303/NitrogenFlooding/indication.c b/F3:F303/NitrogenFlooding/indication.c
new file mode 100644
index 0000000..e6bacf0
--- /dev/null
+++ b/F3:F303/NitrogenFlooding/indication.c
@@ -0,0 +1,188 @@
+/*
+ * This file is part of the nitrogen project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "BMP280.h"
+#include "buttons.h"
+#include "hardware.h"
+#include "ili9341.h"
+#include "incication.h"
+#include "screen.h"
+#include "strfunc.h"
+#include "usb.h"
+
+/*
+ * LEDs:
+ * 0 - blinks all the time
+ * 1 - PWM2 state (blinks as longer as PWM larger)
+ * 2 - PWM3 state (-//-)
+ * 3 - ?
+ */
+// next state change time
+static uint32_t ledT[LEDS_AMOUNT] = {0};
+// arrays of high and low states' length
+static uint32_t ledH[LEDS_AMOUNT] = {199, 0, 0, 0};
+static uint32_t ledL[LEDS_AMOUNT] = {799, 1, 1, 1};
+
+// led blinking
+TRUE_INLINE void leds_proc(){
+    uint32_t v = getPWM(2);
+    ledH[1] = v*5; ledL[1] = (PWM_CCR_MAX - v) * 5;
+    v = getPWM(3);
+    ledH[2] = v*5; ledL[2] = (PWM_CCR_MAX - v) * 5;
+    for(int i = 0; i < LEDS_AMOUNT; ++i){
+        int state = LED_get(i);
+        if(state){ // shining
+            if(ledH[i] == 0) LED_off(i); // don't turn it on
+            else if(ledL[i] && Tms > ledT[i]){
+                LED_off(i);
+                ledT[i] = Tms + ledL[i];
+            }
+        }else{
+            if(ledL[i] == 0) LED_on(i); // don't turn it off
+            else if(ledH[i] && Tms > ledT[i]){
+                LED_on(i);
+                ledT[i] = Tms + ledH[i];
+            }
+        }
+    }
+}
+
+// Display state: main window or menu
+typedef enum{
+    DISP_MAINWIN,
+    DISP_MENU
+} display_state;
+
+static display_state dispstate = DISP_MAINWIN;
+static uint32_t lastTmeas = 0; // last measurement time
+
+static void cls(){ // set default colors (bg=0, fg=0xffff) and clear screen
+    setBGcolor(0);
+    setFGcolor(0xffff);
+    ClearScreen();
+}
+
+static void refresh_mainwin(){ // ask all parameters and refresh main window with new values
+    DBG("REFRESH main window");
+    cls();
+    float T, P, H;
+    BMP280_status s = BMP280_get_status();
+    if(s == BMP280_NOTINIT || s == BMP280_ERR) BMP280_init();
+    SetFontScale(1); // small menu items labels
+    setBGcolor(COLOR_BLACK); setFGcolor(COLOR_LIGHTGREEN);
+    PutStringAt(4, 16, "Temperature Pressure Humidity Dew point");
+    int y = 37;
+    uint16_t fgcolor;
+    if(s == BMP280_RDY && BMP280_getdata(&T, &P, &H)){ // show data
+        if(T < T_MIN || T > T_MAX) fgcolor = COLOR_RED;
+        else if(T < 0) fgcolor = COLOR_BLUE;
+        else fgcolor = COLOR_GREEN;
+        setFGcolor(fgcolor); PutStringAt(32, y, float2str(T, 2));
+        if(P > P_MAX) fgcolor = COLOR_RED;
+        else fgcolor = COLOR_YELLOW;
+        setFGcolor(fgcolor); PutStringAt(112, y, float2str(P, 1));
+        if(H > H_MAX) fgcolor = COLOR_RED;
+        else fgcolor = COLOR_CHOCOLATE;
+        setFGcolor(fgcolor); PutStringAt(192, y, float2str(H, 1));
+        float dew = Tdew(T, H);
+        if(T - dew < DEW_MIN) fgcolor = COLOR_RED;
+        else fgcolor = COLOR_LIGHTBLUE;
+        setFGcolor(fgcolor); PutStringAt(248, y, float2str(dew, 1));
+#ifdef EBUG
+        USB_sendstr("T="); USB_sendstr(float2str(T, 2)); USB_sendstr("\nP=");
+        USB_sendstr(float2str(P, 1));
+        P *= 0.00750062f; USB_sendstr("\nPmm="); USB_sendstr(float2str(P, 1));
+        USB_sendstr("\nH="); USB_sendstr(float2str(H, 1));
+        USB_sendstr("\nTdew="); USB_sendstr(float2str(dew, 1));
+        newline();
+#endif
+    }else{ // show "errr"
+        setBGcolor(COLOR_RED); setFGcolor(COLOR_CYAN);
+        CenterStringAt(y, "No signal");
+    }
+    // display all other data
+    SetFontScale(3);
+    // TODO: show current level
+    setFGcolor(COLOR_RED); CenterStringAt(130, "Level: NULL");
+    if(getPWM(2) || getPWM(3)){
+        setFGcolor(COLOR_GREEN);
+        CenterStringAt(220, "Processing");
+    }
+    UpdateScreen(0, SCRNH-1);
+    if(!BMP280_start()) BMP280_init(); // start new measurement
+}
+
+static void refresh_menu(){ // refresh menu with changed selection
+    DBG("REFRESH menu");
+    cls();
+}
+
+/*
+ * Custom keys:
+ * 0 - main screen
+ * 1 - up
+ * 2 - down
+ * 3 - select/menu
+ */
+TRUE_INLINE void btns_proc(){
+    uint8_t evtmask = 0; // bitmask for active buttons (==1)
+    for(int i = 0; i < BTNSNO; ++i){
+        keyevent evt = keystate(i, NULL); // T may be used for doubleclick detection
+        if(evt == EVT_PRESS || evt == EVT_HOLD) evtmask |= 1<<i;
+    }
+    // now check all buttons
+    if(evtmask & 1<<0){ // escape to main window or force refresh
+        if(dispstate == DISP_MENU){
+            dispstate = DISP_MAINWIN;
+        }
+        lastTmeas = Tms - SENSORS_DATA_TIMEOUT*2; // force refresh
+    }
+    if(dispstate == DISP_MENU){ // buttons 'up'/'down' works only in menu mode
+        if(evtmask & 1<<1){ // up
+            ;
+        }
+        if(evtmask & 1<<2){ // down
+            ;
+        }
+    }
+    if(evtmask & 1<<3){ // select/menu
+        if(dispstate == DISP_MAINWIN){ // switch to menu mode
+            dispstate = DISP_MENU;
+            refresh_menu();
+        }else{ // select
+            ;
+        }
+    }
+}
+
+void indication_process(){
+    if(!LEDsON) return;
+    leds_proc();
+    btns_proc();
+    switch(dispstate){
+        case DISP_MAINWIN:
+            if(Tms - lastTmeas > SENSORS_DATA_TIMEOUT){
+                refresh_mainwin();
+                lastTmeas = Tms;
+            }
+        break;
+        case DISP_MENU: // do nothing
+            ;
+        break;
+    }
+}
diff --git a/F3:F303/NitrogenFlooding/main.c b/F3:F303/NitrogenFlooding/main.c
index 39b5504..0dd74f7 100644
--- a/F3:F303/NitrogenFlooding/main.c
+++ b/F3:F303/NitrogenFlooding/main.c
@@ -18,11 +18,13 @@
 
 #include "adc.h"
 #include "BMP280.h"
-//#include "buttons.h"
+#include "buttons.h"
 //#include "can.h"
 //#include "flash.h"
 #include "hardware.h"
 #include "i2c.h"
+#include "ili9341.h"
+#include "incication.h"
 #include "proto.h"
 #include "screen.h"
 #include "strfunc.h"
@@ -54,14 +56,9 @@ int main(void){
     adc_setup();
     BMP280_setup(0);
     USBPU_ON();
-    uint32_t ctr = 0;
     // CAN_message *can_mesg;
     while(1){
         IWDG->KR = IWDG_REFRESH;
-        if(Tms - ctr > 499){
-            ctr = Tms;
-            LED_blink(0);
-        }
         /*CAN_proc();
         if(CAN_get_status() == CAN_FIFO_OVERRUN){
             USB_sendstr("CAN bus fifo overrun occured!\n");
@@ -94,21 +91,6 @@ int main(void){
         }
         //i2c_have_DMA_Rx(); // check if there's DMA Rx complete
         BMP280_process();
-        BMP280_status s = BMP280_get_status();
-        if(s == BMP280_RDY){ // data ready - get it
-            float T, P, H;
-            if(BMP280_getdata(&T, &P, &H)){
-                USB_sendstr("T="); USB_sendstr(float2str(T, 2)); USB_sendstr("\nP=");
-                USB_sendstr(float2str(P, 1));
-                P *= 0.00750062f; USB_sendstr("\nPmm="); USB_sendstr(float2str(P, 1));
-                USB_sendstr("\nH="); USB_sendstr(float2str(H, 1));
-                USB_sendstr("\nTdew="); USB_sendstr(float2str(Tdew(T, H), 1));
-                newline();
-            }else USB_sendstr("Can't read data\n");
-        }else if(s == BMP280_ERR){
-            USB_sendstr("BME280 error\n");
-            BMP280_init();
-        }
         int l = USB_receivestr(inbuff, MAXSTRLEN);
         if(l < 0) USB_sendstr("ERROR: USB buffer overflow or string was too long\n");
         else if(l){
@@ -116,6 +98,20 @@ int main(void){
             if(ans) USB_sendstr(ans);
         }
         process_screen();
-        //process_keys();
+        process_keys();
+        // turn off screen and LEDs if no keys was pressed last X ms
+        if(LEDsON){
+            if(Tms - lastUnsleep > BTN_ACTIVITY_TIMEOUT){ // timeout - turn off LEDs and screen
+                LEDS_OFF();
+                ili9341_off();
+            }else{ // check operation buttons for menu etc
+                indication_process();
+            }
+        }else{
+            if(Tms - lastUnsleep < BTN_ACTIVITY_TIMEOUT/2){ // recent activity - turn on indication
+                LEDS_ON();
+                ili9341_on();
+            }
+        }
     }
 }
diff --git a/F3:F303/NitrogenFlooding/nitrogen.bin b/F3:F303/NitrogenFlooding/nitrogen.bin
index 805c2d5..61c4c13 100755
Binary files a/F3:F303/NitrogenFlooding/nitrogen.bin and b/F3:F303/NitrogenFlooding/nitrogen.bin differ
diff --git a/F3:F303/NitrogenFlooding/nitrogen.files b/F3:F303/NitrogenFlooding/nitrogen.files
index ed85dc1..5b5717e 100644
--- a/F3:F303/NitrogenFlooding/nitrogen.files
+++ b/F3:F303/NitrogenFlooding/nitrogen.files
@@ -24,6 +24,8 @@ i2c.c
 i2c.h
 ili9341.c
 ili9341.h
+incication.h
+indication.c
 main.c
 pdnuart.c
 pdnuart.h
diff --git a/F3:F303/NitrogenFlooding/proto.c b/F3:F303/NitrogenFlooding/proto.c
index 9bb7975..542a505 100644
--- a/F3:F303/NitrogenFlooding/proto.c
+++ b/F3:F303/NitrogenFlooding/proto.c
@@ -17,6 +17,7 @@
  */
 
 #include "adc.h"
+#include "buttons.h"
 #include "BMP280.h"
 #include "hardware.h"
 #include "i2c.h"
@@ -70,8 +71,8 @@ static void sendkeyuhex(const char *cmd, int parno, uint32_t u){
 static int leds(const char *cmd, int parno, const char *c, int32_t i){
     if(parno < 0){ // enable/disable all
         if(c){
-            LEDsON = (i ? 1 : 0);
-            if(!LEDsON) for(int _ = 0; _ < 4; ++_) LED_off(_);
+            if(i) LEDS_ON();
+            else LEDS_OFF();
         }
         sendkey("LEDon", -1, LEDsON);
     }else{
@@ -212,12 +213,12 @@ static int scrndcr(const char *cmd, int _U_ parno, const char *c, int32_t i){
     }
     sendkeyu(cmd, -1, SCRN_DCX_get());
     return RET_GOOD;
-}
+}/*
 static int scrnrst(const char *cmd, int _U_ parno, const char *c, int32_t i){
-    if(c) SCRN_RST_set(i);
-    sendkeyu(cmd, -1, SCRN_RST_get());
+    if(c) SCRN_CS_set(i);
+    sendkeyu(cmd, -1, SCRN_CS_get());
     return RET_GOOD;
-}
+}*/
 static int scrnrdwr(const char *cmd, int parno, const char *c, int32_t i){
     if(parno < 0 || parno > 255) return RET_WRONGPARNO;
     if(c){
@@ -271,7 +272,13 @@ static int scrninit(const char _U_ *cmd, int _U_ parno, const char _U_ *c, int32
     USB_sendstr(OK);
     return RET_GOOD;
 }
-
+static int scrnonoff(const char _U_ *cmd, int _U_ parno, const char *c, int32_t i){
+    if(!c) return RET_WRONGARG;
+    int r = (i) ? ili9341_on() : ili9341_off();
+    if(!r) return RET_BAD;
+    sendkeyu(cmd, -1, i);
+    return RET_GOOD;
+}
 static int scrnfill(const char *cmd, int parno, const char *c, int32_t i){
     if(parno < 0) parno = RGB(0xf, 0x1f, 0xf);
     if(parno > 0xffff) return RET_WRONGPARNO;
@@ -332,6 +339,12 @@ static int scls(const char *cmd, int parno, const char *c, int32_t i){
     sendkeyuhex(cmd, parno, i);
     return RET_GOOD;
 }
+static int srefr(const char _U_ *cmd, int _U_ parno, const char _U_ *c, int32_t _U_ i){
+    UpdateScreen(0, SCRNH-1);
+    USB_sendstr(OK);
+    return RET_GOOD;
+}
+
 static int scolor(const char *cmd, int parno, const char *c, int32_t i){
     // fg=bg, default: fg=0xffff, bg=0
     if(parno < 0 || parno > 0xffff) parno = 0xffff;
@@ -381,6 +394,16 @@ static int sfscale(const char *cmd, int _U_ parno, const char _U_ *c, int32_t i)
     return RET_GOOD;
 }
 
+static int buttons(const char *cmd, int parno, const char _U_ *c, int32_t _U_ i){
+    if(parno < 0 || parno >= BTNSNO) return RET_WRONGPARNO;
+    uint32_t T;
+    keyevent evt = keystate((uint8_t)parno, &T);
+    sendkeyu(cmd, parno, evt);
+    if(evt != EVT_NONE){
+        USB_sendstr("Tevent="); USB_sendstr(u2str(T)); newline();
+    }
+    return RET_GOOD;
+}
 
 typedef struct{
     int (*fn)(const char*, int, const char*, int32_t);
@@ -393,8 +416,9 @@ commands cmdlist[] = {
     {NULL, "Different commands", NULL},
     {bme, "BME", "get pressure, temperature and humidity"},
     {bmefilter, "BMEf", "set filter (0..4)"},
+    {buttons, "button", "get buttonx state"},
     {buzzer, "buzzer", "get/set (0 - off, 1 - on) buzzer"},
-    {leds, "LED", "LEDx=y; where x=0..3 to work with single LED (then y=1-set, 0-reset, 2-toggle), absent to work with all (y=0 - disable, 1-enable)"},
+    {leds, "LED", "LEDx=y; where x=0..3 to work with single LED (then y=1-set, 0-reset, 2-toggle), absent to set LEDsON (y=0 - disable, 1-enable)"},
     {pwm, "pwm", "set/get x channel (0..3) pwm value (0..100)"},
     {reset, "reset", "reset MCU"},
     {tms, "tms", "print Tms"},
@@ -406,7 +430,7 @@ commands cmdlist[] = {
     {NULL, "Screen commands", NULL},
     {scrnled, "Sled", "turn on/off screen lights"},
     {scrndcr, "Sdcr", "set data(1)/command(0)"},
-    {scrnrst, "Srst", "reset (1/0)"},
+   // {scrnrst, "Srst", "reset (1/0)"},
     {scrnrdwr, "Sreg", "read/write 8-bit register"},
     {scrnrdwr4, "Sregx", "read/write 32-bit register"},
     {scrnrdn, "Sregn", "read from register x =n bytes"},
@@ -415,12 +439,14 @@ commands cmdlist[] = {
     {scrndata4, "Sdatn", "write x bytes of =data"},
     {sread, "Sread", "read "},
     {scrninit, "Sini", "init screen"},
+    {scrnonoff, "Spower", "=0 - off, =1 - on"},
     {scrnfill, "Sfill", "fill screen with color (=npix)"},
     {scrnfilln, "Sfilln", "fill screen (next) with color (=npix)"},
     {smadctl, "Smad", "change MADCTL"},
     {scol, "Scol", "set column limits (low=high)"},
     {srow, "Srow", "set row limits (low=high)"},
     {scls, "Scls", "clear screen fg=bg"},
+    {srefr, "Srefresh", "refresh full screen"},
     {scolor, "Scolor", "seg color fg=bg"},
     {sputstr, "Sstr", "put string y=string"},
     {sstate, "Sstate", "current screen state"},
diff --git a/F3:F303/NitrogenFlooding/screen.c b/F3:F303/NitrogenFlooding/screen.c
index c1ff253..63dcb40 100644
--- a/F3:F303/NitrogenFlooding/screen.c
+++ b/F3:F303/NitrogenFlooding/screen.c
@@ -90,7 +90,6 @@ void ClearScreen(){
         foreground[i] = fgColor;
         background[i] = bgColor;
     }
-    for(int i = SPRITE_SZ-40; i < SPRITE_SZ; ++i) foreground[i] = i;
     UpdateScreen(0, SCRNH-1);
 }
 
@@ -199,7 +198,7 @@ int strpixlen(const char *str){
         const uint8_t *c = font_char(*str++);
         if(c) l += *c;
     }
-    return l;
+    return l * fontscale;
 }
 
 // convert buffer  to update (return 0 if all sent)
diff --git a/F3:F303/NitrogenFlooding/screen.h b/F3:F303/NitrogenFlooding/screen.h
index a912f7f..fd2e567 100644
--- a/F3:F303/NitrogenFlooding/screen.h
+++ b/F3:F303/NitrogenFlooding/screen.h
@@ -42,6 +42,52 @@ typedef enum{ // screen states
 // maximal font scale
 #define FONTSCALEMAX    (10)
 
+// some base colors
+#define COLOR_BLACK 0x0000
+#define COLOR_BLUE 0x001F
+#define COLOR_BROWN 0xA145
+#define COLOR_CHOCOLATE 0xD343
+#define COLOR_CYAN 0x07FF
+#define COLOR_DARKBLUE 0x0011
+#define COLOR_DARKCYAN 0x03EF
+#define COLOR_DARKGRAY 0x8410
+#define COLOR_DARKGREEN 0x03E0
+#define COLOR_DARKMAGENTA 0x8811
+#define COLOR_DARKORANGE 0xFC60
+#define COLOR_DARKRED 0x8800
+#define COLOR_DARKVIOLET 0x901A
+#define COLOR_DEEPPINK 0xF8B2
+#define COLOR_GOLD 0xFEA0
+#define COLOR_GRAY 0xAD55
+#define COLOR_GREEN 0x07E0
+#define COLOR_GREENYELLOW 0xAFE5
+#define COLOR_INDIGO 0x4810
+#define COLOR_KHAKI 0xF731
+#define COLOR_LIGHTBLUE 0xAEDC
+#define COLOR_LIGHTCYAN 0xE7FF
+#define COLOR_LIGHTGREEN 0x9772
+#define COLOR_LIGHTGRAY 0xC618
+#define COLOR_LIGHTYELLOW 0xFFFC
+#define COLOR_MAGENTA 0xF81F
+#define COLOR_MEDIUMBLUE 0x0019
+#define COLOR_NAVY 0x000F
+#define COLOR_OLIVE 0x7BE0
+#define COLOR_ORANGE 0xFD20
+#define COLOR_ORANGERED 0xFA20
+#define COLOR_PALEGREEN 0x9FD3
+#define COLOR_PINK 0xF81F
+#define COLOR_PURPLE 0x780F
+#define COLOR_RED 0xf800
+#define COLOR_SEAGREEN 0x2C4A
+#define COLOR_SKYBLUE 0x867D
+#define COLOR_SPRINGGREEN 0x07EF
+#define COLOR_STEELBLUE 0x4416
+#define COLOR_TOMATO 0xFB08
+#define COLOR_WHITE 0xFFFF
+#define COLOR_YELLOW 0xFFE0
+#define COLOR_YELLOWGREEN 0x9E66
+
+
 screen_state getScreenState();
 void ClearScreen();
 void UpdateScreen(int y0, int y1);
diff --git a/F3:F303/NitrogenFlooding/version.inc b/F3:F303/NitrogenFlooding/version.inc
index 3a1d7b1..f64e00a 100644
--- a/F3:F303/NitrogenFlooding/version.inc
+++ b/F3:F303/NitrogenFlooding/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "242"
-#define BUILD_DATE "2023-05-11"
+#define BUILD_NUMBER "253"
+#define BUILD_DATE "2023-05-12"
diff --git a/makefile.stm32 b/makefile.stm32
index 6e51ee4..6fb8ab5 100644
--- a/makefile.stm32
+++ b/makefile.stm32
@@ -48,7 +48,7 @@ LIB_DIR		:= $(INC_DIR)/ld
 ###############################################################################
 # C flags
 CFLAGS		+= -O2 -D__thumb2__=1 -MD
-CFLAGS		+= -Wall -Wextra -Wshadow 
+CFLAGS		+= -Wall -Wextra -Wshadow -Wdouble-promotion
 CFLAGS		+= -fshort-enums -ffunction-sections -fdata-sections
 #CFLAGS		+= -fno-common -fno-stack-protector
 CFLAGS		+=  $(ARCH_FLAGS)