A new sample showing how to restict the rotator going outside a specific range and using steps of 2.

Author: mathertel

examples/LimitedRotator/LimitedRotator.ino

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+// -----
+// LimitedRotator.ino - Example for the RotaryEncoder library.
+// This class is implemented for use with the Arduino environment.
+// Copyright (c) by Matthias Hertel, http://www.mathertel.de
+// This work is licensed under a BSD style license. See http://www.mathertel.de/License.aspx
+// More information on: http://www.mathertel.de/Arduino
+// -----
+// 26.03.2017 created by Matthias Hertel
+// -----
+
+// This example checks the state of the rotary encoder in the loop() function.
+// The current position is printed on output when changed.
+// In addition to the SimplePollRotator example here the range of the rotator is limited to the range 0 - 16 and only incremental steps of 2 are realized.
+// To implement this limit the boundaries are checked and eventually the current position is adjusted.
+// The internal (physical) position of the rotary encoder library remains by stepping with the increment 1
+// so the the logical position is calculated by applying the ROTARYSTEPS factor.
+
+// Hardware setup:
+// Attach a rotary encoder with output pins to A2 and A3.
+// The common contact should be attached to ground.
+
+#include <RotaryEncoder.h>
+
+#define ROTARYSTEPS 2
+#define ROTARYMIN 0
+#define ROTARYMAX 16
+
+// Setup a RoraryEncoder for pins A2 and A3:
+RotaryEncoder encoder(A2, A3);
+
+// Last known rotary position.
+int lastPos = -1;
+
+void setup()
+{
+  Serial.begin(57600);
+  Serial.println("LimitedRotator example for the RotaryEncoder library.");
+  encoder.setPosition(10 / ROTARYSTEPS); // start with the value of 10.
+} // setup()
+
+
+// Read the current position of the encoder and print out when changed.
+void loop()
+{
+  encoder.tick();
+
+  // get the current physical position and calc the logical position
+  int newPos = encoder.getPosition() * ROTARYSTEPS;
+
+  if (newPos < ROTARYMIN) {
+    encoder.setPosition(ROTARYMIN / ROTARYSTEPS);
+    newPos = ROTARYMIN;
+
+  } else if (newPos > ROTARYMAX) {
+    encoder.setPosition(ROTARYMAX / ROTARYSTEPS);
+    newPos = ROTARYMAX;
+  } // if
+
+  if (lastPos != newPos) {
+    Serial.print(newPos);
+    Serial.println();
+    lastPos = newPos;
+  } // if
+} // loop ()
+
+// The End
+