fix issue #752

include/button.h

@@ -7,6 +7,10 @@
 #include "display.h"
 #include "payload.h"
 
+#ifndef BUTTON_ACTIVEHIGH
+#define BUTTON_ACTIVEHIGH 0
+#endif
+
 void button_init(int pin);
 void readButton();
 

src/button.cpp

@@ -11,10 +11,10 @@ static const char TAG[] = __FILE__;
 static Button *b = NULL;
 
 void button_init(int pin) {
-#ifdef BUTTON_PULLDOWN
-  b = new Button(pin);
-#else
+#ifdef BUTTON_PULLUP
   b = new ButtonPullup(pin);
+#else
+  b = new Button(pin, !BUTTON_ACTIVEHIGH);
 #endif
 
   // attach events to the button