neu-implementierung. Funktioniert einigermaßen, interferiert aber mit anderen timer-basierten bibliotheken

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

examples/SendButton/SendButton.ino

@@ -0,0 +1,33 @@
+/*
+ This sketch demonstrates, how to use the SoftRS485 library.
+ This library makes use of Arduinos timer 1
+ */
+
+#include <SoftRS485.h>
+
+const int buttonPin = 10;     // the number of the pushbutton pin
+boolean button_state = true;
+
+void setup() {
+  Serial.begin(115200);
+
+  init485(2,3,4,5); // library initialization:
+  // connect pin 2 to RO of Max485
+  // connect pin 3 to ^RE of Max485
+  // connect pin 4 to DE of Max485
+  // connect pin 5 to DI of Max485
+
+  pinMode(buttonPin, INPUT_PULLUP);
+}
+
+void loop(){
+  boolean new_state = digitalRead(buttonPin);
+  if (new_state != button_state){
+    button_state = new_state;
+    if (new_state == LOW){
+      send485("Button pressed");
+    } else {
+      send485("Button released");
+    }
+  }
+}