diff --git a/simpleclock.ino b/simpleclock.ino
index d26846d..49a12f8 100644
--- a/simpleclock.ino
+++ b/simpleclock.ino
@@ -1,160 +1,160 @@
-/*  
- *           7 Segment 4 Digits clock with digit point separator
- *  
- *           It uses display module with common anode and DS1307
- *           RTC module to enhance time keeping ability of
- *           Atmega 328p based Arduino nano microcontroller and
- *           2 buttons for adjusting time.
- */
-
-/* This software distributed under BSD 2 Clause License
-
-Copyright (c) Sergei Fedosoff, All rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
-
-Redistributions of source code must retain the above copyright notice, this list
-of conditions and the following disclaimer. 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. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
-CONTRIBUTORS "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 OR
-CONTRIBUTORS 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.
-*/
-
-#include <SevSeg.h>
-#include <Wire.h>
-#include <TimeLib.h>
-// DS1307 lib by FrankieChu for Seeed RTC module
-#include <DS1307.h>
-
-DS1307 clock;
-SevSeg Display;
-
-unsigned long currentMillis;
-unsigned long previousMillis = 0;
-const long interval = 500;
-const int hrs_btn = A0;
-const int min_btn = A1;
-bool dot = true;
-uint8_t minutes;
-uint8_t hours;
-
-void setup()
-{
-	// setup display
-	byte hardwareConfig = COMMON_ANODE;
-	byte numDigits = 4;
-	byte digitPins[] = {9, 10, 11, 12};
-	byte segmentPins[] = {2, 3, 4, 5, 6, 7, 8, 13};
-	bool resistorsOnSegments = true;   // 8 resistors, 330 Ohms each
-	bool updateWithDelays = false;     // Default. Recommended
-	/* without it there is visual bug at 0 o'clock, and in current version of
-	 * SevSeg' setChars() does not dots at all */
-	bool leadingZeros = false;          
-
-	Display.begin(hardwareConfig, numDigits, digitPins, segmentPins,
-                      resistorsOnSegments, updateWithDelays, leadingZeros);
-	Display.setBrightness(90);
-
-	// setup clock
-	clock.begin();
-
-	// if rtc returns incorrect time, reset it to some default value
-	clock.getTime();
-
-	if (( clock.hour > 23 ) || (clock.minute > 59))
-	{
-		clock.fillByYMD(2019,2,23);  // 23 Feb 2013
-		clock.fillByHMS(15,52,30);   // 15:52 30"
-		clock.fillDayOfWeek(SAT);    // Saturday
-		clock.setTime();             // put date to rtc
-	}
-
-	// setup control buttons
-	pinMode(hrs_btn, INPUT_PULLUP);
-	pinMode(min_btn, INPUT_PULLUP);
-}
-
-
-void loop()
-{
-	unsigned long currentMillis = millis();
-	char str[4];
-	float d;
-	
-	if (currentMillis - previousMillis >= interval)
-	{
-		previousMillis = currentMillis;
-
-		if (dot == false)
-		{
-			dot = true;
-
-			if (digitalRead(hrs_btn) == LOW)
-			{
-				clock.getTime();
-				hours = clock.hour + 1;
-				(hours > 23)? hours = 0: hours;
-				clock.fillByHMS(hours, clock.minute, 0);
-				clock.setTime();
-			}
-
-			if (digitalRead(min_btn) == LOW)
-			{
-				clock.getTime();
-				minutes = clock.minute + 1;
-				(minutes > 59)? minutes = 0: minutes;
-				clock.fillByHMS(clock.hour, minutes, 0);
-				clock.setTime();
-			}
-		}
-		else
-		{
-			dot = false;
-		}
-	}
-
-	clock.getTime();
-
-	// make blinking dot
-	if (clock.hour > 0)
-	{
-		if (dot == true) 
-		{
-			Display.setNumber((clock.hour * 100 + clock.minute), 2);
-		}
-		else
-		{
-			Display.setNumber((clock.hour * 100 + clock.minute));
-		}
-	}
-	else
-	{
-		/* 0 o'clock is an exception, we dont want to see "00.00", we want see
-		 * "0.00" or "0 00", so we have to use this "hack" */
-		if (dot == true)
-		{
-			d = float(clock.minute) / 100;
-			Display.setNumber(d, 2);
-		}
-		else
-		{
-			sprintf(str, "%2d%02d", clock.hour, clock.minute);
-			Display.setChars(str);
-		}
-	}
-
-	Display.refreshDisplay();
-}
-
-/* vim: set filetype=cpp: */
+/*  
+ *           7 Segment 4 Digits clock with digit point separator
+ *  
+ *           It uses display module with common anode and DS1307
+ *           RTC module to enhance time keeping ability of
+ *           Atmega 328p based Arduino nano microcontroller and
+ *           2 buttons for adjusting time.
+ */
+
+/* This software distributed under BSD 2 Clause License
+
+Copyright (c) Sergei Fedosoff, All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+Redistributions of source code must retain the above copyright notice, this list
+of conditions and the following disclaimer. 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. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "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 OR
+CONTRIBUTORS 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.
+*/
+
+#include <SevSeg.h>
+#include <Wire.h>
+#include <TimeLib.h>
+// DS1307 lib by FrankieChu for Seeed RTC module
+#include <DS1307.h>
+
+DS1307 clock;
+SevSeg Display;
+
+unsigned long currentMillis;
+unsigned long previousMillis = 0;
+const long interval = 500;
+const int hrs_btn = A0;
+const int min_btn = A1;
+bool dot = true;
+uint8_t minutes;
+uint8_t hours;
+
+void setup()
+{
+	// setup display
+	byte hardwareConfig = COMMON_ANODE;
+	byte numDigits = 4;
+	byte digitPins[] = {9, 10, 11, 12};
+	byte segmentPins[] = {2, 3, 4, 5, 6, 7, 8, 13};
+	bool resistorsOnSegments = true;   // 8 resistors, 330 Ohms each
+	bool updateWithDelays = false;     // Default. Recommended
+	/* without it there is visual bug at 0 o'clock, and in current version of
+	 * SevSeg' setChars() does not dots at all */
+	bool leadingZeros = false;          
+
+	Display.begin(hardwareConfig, numDigits, digitPins, segmentPins,
+                      resistorsOnSegments, updateWithDelays, leadingZeros);
+	Display.setBrightness(90);
+
+	// setup clock
+	clock.begin();
+
+	// if rtc returns incorrect time, reset it to some default value
+	clock.getTime();
+
+	if (( clock.hour > 23 ) || (clock.minute > 59))
+	{
+		clock.fillByYMD(2019,2,23);  // 23 Feb 2013
+		clock.fillByHMS(15,52,30);   // 15:52 30"
+		clock.fillDayOfWeek(SAT);    // Saturday
+		clock.setTime();             // put date to rtc
+	}
+
+	// setup control buttons
+	pinMode(hrs_btn, INPUT_PULLUP);
+	pinMode(min_btn, INPUT_PULLUP);
+}
+
+
+void loop()
+{
+	unsigned long currentMillis = millis();
+	char str[4];
+	float d;
+	
+	if (currentMillis - previousMillis >= interval)
+	{
+		previousMillis = currentMillis;
+
+		if (dot == false)
+		{
+			dot = true;
+
+			if (digitalRead(hrs_btn) == LOW)
+			{
+				clock.getTime();
+				hours = clock.hour + 1;
+				(hours > 23)? hours = 0: hours;
+				clock.fillByHMS(hours, clock.minute, 0);
+				clock.setTime();
+			}
+
+			if (digitalRead(min_btn) == LOW)
+			{
+				clock.getTime();
+				minutes = clock.minute + 1;
+				(minutes > 59)? minutes = 0: minutes;
+				clock.fillByHMS(clock.hour, minutes, 0);
+				clock.setTime();
+			}
+		}
+		else
+		{
+			dot = false;
+		}
+	}
+
+	clock.getTime();
+
+	// make blinking dot
+	if (clock.hour > 0)
+	{
+		if (dot == true) 
+		{
+			Display.setNumber((clock.hour * 100 + clock.minute), 2);
+		}
+		else
+		{
+			Display.setNumber((clock.hour * 100 + clock.minute));
+		}
+	}
+	else
+	{
+		/* 0 o'clock is an exception, we dont want to see "00.00", we want see
+		 * "0.00" or "0 00", so we have to use this "hack" */
+		if (dot == true)
+		{
+			d = float(clock.minute) / 100;
+			Display.setNumber(d, 2);
+		}
+		else
+		{
+			sprintf(str, "%2d%02d", clock.hour, clock.minute);
+			Display.setChars(str);
+		}
+	}
+
+	Display.refreshDisplay();
+}
+
+/* vim: set filetype=cpp: */