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diff --git a/src/core/arithmetical.h b/src/core/arithmetical.h
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+#ifndef ARITHMETICAL_H_
+#define ARITHMETICAL_H_
+/**************************************************************************//**
+ * @file     arithmetical.h
+ * @brief    Arduino-like library for eXodusino(LPC1114)
+ * @version	v.0.50
+ * @date	3. May 2012.
+ * @author	@@lynxeyed_atsu
+ * @note	Copyright (c) 2011 Lynx-EyED's Klavier and Craft-works. <BR>
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions: <BR>
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.<BR>
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ******************************************************************************/
+#ifdef abs
+#undef abs
+#endif
+
+#define abs(x) ((x)>0?(x):-(x))
+#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
+#define round(x)     ((x)>=0?(long)((x)+0.5):(long)((x)-0.5))
+#define radians(deg) ((deg)*DEG_TO_RAD)
+#define degrees(rad) ((rad)*RAD_TO_DEG)
+#define sq(x) ((x)*(x))
+
+#define lowByte(w) ((uint8_t) ((w) & 0xff))
+#define highByte(w) ((uint8_t) ((w) >> 8))
+
+#define bitRead(value, bit) (((value) >> (bit)) & 0x01)
+#define bitSet(value, bit) ((value) |= (1UL << (bit)))
+#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
+#define bitWrite(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit))
+#define bit(b) (1UL << (b))
+#define map(x,in_min,in_max,out_min,out_max) \
+(((x) - (in_min)) * ((out_max) - (out_min)) / ((in_max) - (in_min)) + (out_min))
+
+
+#endif /* ARITHMETICAL_H_ */