notes in CanGrow.ino

Arduino/CanGrow/CanGrow.ino

@@ -976,7 +976,9 @@ void setup() {
   digitalWrite(PINled, LOW);
   digitalWrite(PINpump, LOW);
 
-  // set frequency lower to avoid annoying noises
+  // set PWM frequency lower to avoid annoying noises
+  // in combination with 47uF at fan output, 220Hz is kinda sweetspot
+  // 220Hz is note A3 btw. 
   analogWriteFreq(220);
 
   // Start Serial
@@ -2057,10 +2059,12 @@ void APIgetSensors() {
  *
  * 
  * - Sunrise and Sunset PWM if PWM is set
- * - PWM for fan control
  * - avoid using javascript to set the GrowName in the Menu and the time
  *   as well
  * - rework UseLEDrelais usage
+ * - when PWM for fan is set, set fan speed to regulate humidity and 
+ *   temperature
+ * - re-organize EEPROM saved values. 
  * 
  *    
 */