add long hold for trigger continuous ev reading

lightmeter.ino

@@ -49,6 +49,7 @@ BH1750 lightMeter;
 #define INCIDENTDELAY 100 //minimum delay between incident sensor (BH1750) readings
 #define DEBOUNCETIME 20 //time to not check for inputs after key press
 #define BUTTONTIMEHOLD 750 //time for button hold
+#define BUTTONTIMEHOLDLONG 3000 //time for button long hold
 
 #define VOLTAGE_WARN 3.4 //voltage per cell   //TODO implement warning
 
@@ -102,6 +103,10 @@ boolean button_hold_left=false;
 boolean button_hold_center=false;
 boolean button_hold_right=false;
 
+//even longer press
+boolean button_hold_long_trigger=false;
+long timebuttonpressed_trigger_long=0;
+
 float vbat=100;
 
 struct Settings {
@@ -362,11 +367,16 @@ void handleInputs()
   button_hold_center=false;
   button_hold_right=false;
 
+  //even longer press
+  button_hold_long_trigger=false;
+  
+
   if (millis()-millis_lastinput>DEBOUNCETIME) //Button debouncing
   {
     //Trigger
     if (timebuttonpressed_trigger == 0 && !digitalRead(PIN_TRIGGER)){ //first time pressed down. (low when pressed)
       timebuttonpressed_trigger=loopmillis; //set time of button press
+      timebuttonpressed_trigger_long=loopmillis; //set time of button press, for long hold timing
     }else if(timebuttonpressed_trigger != 0 && digitalRead(PIN_TRIGGER)){ //button released (was pressed)
       if (loopmillis-timebuttonpressed_trigger < BUTTONTIMEHOLD){ //short press
         button_trigger=true;
@@ -376,6 +386,12 @@ void handleInputs()
       button_hold_trigger=true;
       timebuttonpressed_trigger=-1; //-1 as flag for hold triggered
     }
+
+    if (timebuttonpressed_trigger_long>0 && loopmillis-timebuttonpressed_trigger_long >= BUTTONTIMEHOLDLONG  && !digitalRead(PIN_TRIGGER)) { //button held down even longer, set hold long flag for as long as button is down
+      button_hold_long_trigger=true;
+    }else if(timebuttonpressed_trigger_long>0 && digitalRead(PIN_TRIGGER)){ //released 
+      timebuttonpressed_trigger_long=0; //reset long hold timing
+    }
   
     //Left
     if (timebuttonpressed_left == 0 && !digitalRead(PIN_BTNLEFT)){ //first time pressed down. (low when pressed)
@@ -645,7 +661,7 @@ void handleInputs_Lightmeter()
     }
   }
 
-  if (button_trigger) { //Trigger
+  if (button_trigger || button_hold_long_trigger) { //Trigger or very long hold
     ev_last=ev;
     ev=getEV(); //set ev to current measurement by selected mode
     if (ev<ev_min || ev_min<-254){ //new ev is smaller than last or ev_min wasn set
@@ -659,10 +675,13 @@ void handleInputs_Lightmeter()
     //LED Brightness on trigger
     uint8_t triggerblinkbrightness=255;
     if (ev<4){ //dim led when dark
-      triggerblinkbrightness=map(ev,4,2,255,10);
+      triggerblinkbrightness=map(ev,2,4,5,255);
     }
     if (ev<2){
-      triggerblinkbrightness=10;
+      triggerblinkbrightness=5;
+    }
+    if (button_hold_long_trigger){ //low brightness on long hold
+      triggerblinkbrightness=5;
     }
     blinkLED(20,triggerblinkbrightness);
   }
@@ -679,6 +698,7 @@ void handleInputs_Lightmeter()
     blinkLED(400,triggerblinkbrightness);
   }
 
+
 }
 
 
@@ -1419,14 +1439,14 @@ void updateDisplay_Lightmeter() //Lightmeter display
 
   
   display.setCursor(xpos_debug+50,ypos_debug-5);
-  if (ev_min>-254) { //ev min set
+  if (ev_min>-254 && ev>=ev_min) { //ev min set
     display.print("-");
     display.print(ev-ev_min,1);
   }else{
     display.print("/");
   }
   display.print(" <> ");
-  if (ev_max>-254){
+  if (ev_max>-254 && ev<=ev_max){
     display.print("+");
     display.print(ev_max-ev,1);
   }else{