Define servoshutter behaviour without switch (or switch in open state).

ServoShutter/CHANGELOG.md

 # CHANGELOG
 
+## 1.2.0
+
+### Changed
+
+- Switch uses internal pullup for defined behavior.
+
+
 ## 1.1.0
 
 ### Added

ServoShutter/ServoShutter.ino

@@ -10,7 +10,7 @@ o? queries the current output state (independent whether it has been set via com
 "l" returns the current state and manual mode (tab separated)
 ****************************
 */
-const String version = "1.1.0"; // Version of this script
+const String version = "1.2.0"; // Version of this script
 
 // Servo setup
 #include <Servo.h> 
@@ -31,8 +31,8 @@ void setup()
 
   // Read initial state
   delay(100);
-  val = analogRead(switchPin);
-  if ( val >= 512 ){
+  pinMode(switchPin, INPUT_PULLUP);
+  if ( !digitalRead(switchPin) ){
     state = -2;
   }
 }
@@ -97,13 +97,13 @@ void loop()
   }
 
   if ( manual ){
-    val = analogRead(switchPin);
+    val = digitalRead(switchPin);
     // If the analog value changed from the known state or known switch, change shutter.
-    if(val >= 512 && (state == 0 || state == -1))
+    if( !val && (state == 0 || state == -1))
     {
       openShutter();
     }
-    else if(val < 512 && (state == 1 || state == -2))
+    else if( val && (state == 1 || state == -2))
     {
       closeShutter();
     }