Initial commit

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

rotoryEncoder.ino

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+#define SENS0_PIN 2
+#define SENS1_PIN 3
+#define ANALOGOUT_PIN 11
+#define HOMESW_PIN 10
+
+#define NUMOFTEATH 360
+#define DEGPERSTAP 3600/(NUMOFTEATH*2)
+
+int16_t angle = 0;
+
+/** setPWM
+ * set the pwm dutycyle
+ * 
+ * @arg value (uint8_t): value for PWM; between 0 - 255
+ */
+void setPWM(uint8_t value){
+  OCR2A = value;
+}
+
+void sens0(){
+  if(digitalRead(SENS0_PIN) != digitalRead(SENS1_PIN)){
+    angle += DEGPERSTAP * 10;
+  }
+}
+void sens1(){
+  if(digitalRead(SENS0_PIN) != digitalRead(SENS1_PIN)){
+    angle -= DEGPERSTAP * 10;
+  }
+}
+
+void setup(){
+  pinMode(HOMESW_PIN, INPUT_PULLUP);
+
+  // setup analog out
+  pinMode(ANALOGOUT_PIN, OUTPUT);
+  TCCR2A = _BV(COM2A1) | _BV(WGM20);
+  TCCR2B = _BV(CS22);
+  setPWM(0);
+
+  // setup rotory sensor
+  pinMode(SENS0_PIN, INPUT);
+  pinMode(SENS1_PIN, INPUT);
+  attachInterrupt(digitalPinToInterrupt(SENS0_PIN), sens0, CHANGE);
+  attachInterrupt(digitalPinToInterrupt(SENS1_PIN), sens1, CHANGE);
+}
+
+void loop(){
+  // delay while checking the home sw
+  for(uint8_t i = 200; i != 0; i--){
+    if(digitalRead(HOMESW_PIN) == LOW){
+      angle = 0;
+    }
+  }
+
+  // wrap angle around
+  if(angle > 3600)
+    angle -= 3600;
+  else if(angle < 0)
+    angle += 3600;
+
+  // update PWM
+  uint16_t a = angle;
+  setPWM(map(a, 0, 360, 0, 255));
+}