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diff --git a/arduino/libraries/RotaryEncoder/SwRotaryEncoder.h b/arduino/libraries/RotaryEncoder/SwRotaryEncoder.h
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+++ b/arduino/libraries/RotaryEncoder/SwRotaryEncoder.h
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+/**************************************************************************/
+/*!
+    @file     SwRotaryEncoder.h
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, Adafruit Industries (adafruit.com)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+#ifndef SWROTARYENCODER_H_
+#define SWROTARYENCODER_H_
+
+#include "Arduino.h"
+
+#define SW_ROTARY_ENCODER_MAX_INSTANCE    4
+
+class SwRotaryEncoder
+{
+  public:
+    typedef void (*callback_t) (int step);
+
+    SwRotaryEncoder(void)
+    {
+      _pina = _pinb = 0;
+
+      _a_last = 0;
+      _last_read = _abs = 0;
+
+      _cb = NULL;
+    }
+
+    bool begin(uint8_t pina, uint8_t pinb);
+    void setCallback(callback_t fp);
+    void stop(void);
+
+    int32_t read(void);
+    int32_t readAbs(void);
+    void    writeAbs(int32_t value);
+    void    clearAbs(void);
+
+    // Internal API
+    void _irq_handler(void);
+
+  private:
+    uint8_t _pina, _pinb;
+
+    uint8_t _a_last;
+
+    int32_t _abs;
+    int32_t _last_read; // debouncing
+
+    callback_t _cb;
+};
+
+
+
+#endif /* SWROTARYENCODER_H_ */