Improved display of particle values.

aqi.ino

@@ -166,7 +166,7 @@ void loop(void)
     }
 }
 
-// Force write data to screen.
+// Write data to screen.
 void update_screen(void)
 {
     col = row = 0;
@@ -175,15 +175,15 @@ void update_screen(void)
         lcd.setCursor(col, row);
         switch (values[current_screen][f]) {
         case pm_1p0:
-            lcd.print("1: ");
+            lcd.print("01: ");
             lcd.print(sen44_mes.pm1p0);
             break;
         case pm2p5:
-            lcd.print("2: ");
+            lcd.print("02: ");
             lcd.print(sen44_mes.pm2p5);
             break;
         case pm4p0:
-            lcd.print("4: ");
+            lcd.print("04: ");
             lcd.print(sen44_mes.pm4p0);
             break;
         case pm10p0: