add function to switch states, add example of switching after x amount of time, delete old locking timing functions

pointlights.ino

@@ -1,5 +1,6 @@
 enum ledStates {INCREASE, DECREASE, STAY, WAVE, OFF, ON}; // Here we make nicknames for the different states our program supports.
 enum ledStates ledState; // We define 'ledState' as type ledStates'
+enum ledStates previousLedState = ledState;
 
 unsigned long startMillis;  //some global variables available anywhere in the program
 unsigned long currentMillis;
@@ -21,12 +22,13 @@ void loop() {
   compose();
   delay(10);
   analogWrite(ledPin, brightness);
-
+  currentMillis = millis(); //store the current time since the program started
 }
 
 void compose() {
   // this is a state machine which allows us to decouple the various operations from timed loops. 
   // instead we just switch from state to state when particular conditions are met.
+  // we switch states by calling the changeState() function.
   
   switch (ledState){
 
@@ -36,7 +38,8 @@ void compose() {
     plot("INCREASING", brightness);
         
     if (brightness > 250){
-      ledState = WAVE;
+      //ledState = WAVE;
+      changeState(WAVE);
       }
     break;
    
@@ -44,14 +47,19 @@ void compose() {
     brightness = decrease_brightness(brightness, 0.5);
     plot("DECREASING", brightness);
       if (brightness == 0){
-      ledState = OFF;
+      changeState(OFF);
       }
      break;
 
   case WAVE:
     plot("WAVE", brightness);
-    doForMs(5000, wavyshine); // this you might want to do for number of pulses, rather than for duration
-    ledState = DECREASE;
+    
+    brightness = sinewave(1000,256,0); // you can tweak the parameters of the sinewave
+    analogWrite(ledPin, brightness);
+    
+    if (currentMillis - startMillis >= 5000){ //change state after 5 secs by comparing the time elapsed since we last change state
+      changeState(DECREASE);
+      }
     break;
     
   case STAY:
@@ -67,21 +75,17 @@ void compose() {
   case OFF:
     plot("OFF", brightness);
     brightness = 0;
-    doAfterMs(5000, goBackOn);
+    if (currentMillis - startMillis >= 1000){
+      changeState(INCREASE);
+      }
     break;
-    
-  
   }
 }
 
-void goBackOn(){
-  ledState=INCREASE;
-  }
-
-void wavyshine(){
-  plot("WAVE", brightness);
-  brightness = sinewave(1000,256,0); // you can tweak the parameters of the sinewave
-  analogWrite(ledPin, brightness);
+void changeState(ledStates newState){
+    // call to change state, will keep track of time since last state
+    startMillis = millis();
+    ledState = newState;
   }
   
 void plot(char *state, int brightness){
@@ -110,31 +114,3 @@ int sinewave(float duration, float amplitude, int offset){
     value = value + offset; //offset allows you to move the wave up and down on the Y-axis. Should not exceed the value of amplitude to prevent clipping.
     return value;
   }
-
-void doForMs(int duration, void (*function)()){
-  // this helper function allows us to execute another function for 'duration' amount of millisecs
-  bool doing = true;
-  startMillis = millis();
-  while(doing){
-    currentMillis = millis();
-    (*function)();
-    if (currentMillis - startMillis >= duration){
-      doing = false;
-      }
-    }
-   
-  }
-
-  void doAfterMs(int duration, void (*function)()){
-  // this helper function allows us to execute another function AFTER a 'duration' amount of millisecs
-  bool doing = true;
-  startMillis = millis();
-  while(doing){
-    currentMillis = millis();
-    if (currentMillis - startMillis >= duration){
-      doing = false;
-      (*function)();
-      }
-    }
-   
-  }