Implement simple dim

* move Time Compensation feature under define
* translte last few eol to unix style
* make correction: in my case with bad chrystal rtc runs faster about
  9.5 seconds per day

simpleclock.ino

@@ -11,6 +11,13 @@
 #include <DS1307.h>
 #include <SevSeg.h>
 
+/* disable time compensation
+ * as we borrow more accurate chrystal and solder it to rtc breakboard
+ */
+//#define TIMECOMP
+/* 0.5 second/day compensation flag */
+//#define OFIVECOMP
+
 #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
 #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
 
@@ -29,16 +36,22 @@ unsigned long previousPushTimer = 0;
 /* dot blinking stuff */
 volatile bool dot = true;
 
+#ifdef TIMECOMP
 /* time inaccuracy compensation flag */
 volatile bool compflag1 = true;
 volatile bool compflag2 = false;
-const uint8_t timeSkew = 8;          // assume that clock runs faster than should
+const uint8_t timeSkew = 9;          // assume that clock runs faster than should
+#ifdef OFIVECOMP
 volatile bool timeSkewEven = false;  // comp. 1 additional second per 2 days
+#endif
+#endif
 
 /* ambient light compensation aka night mode */
 const int photoPin = A2;
 volatile bool measureAmbLight = true;
-unsigned int ambLight = 0;
+unsigned int ambLight = 0;           // actual value
+unsigned int ambLight2 = 0;          // previous med. value
+unsigned int ambLight3 = 0;          // pre-previous med. value
 unsigned long previousLightTimer = 0;
 const long refresh_interval = 40;    // refresh rate 25Hz
 
@@ -132,38 +145,48 @@ ISR(TIMER1_OVF_vect)
 	else
 		dot = true;
 
+#ifdef TIMECOMP
 /* time compensation magic */
 	if ((myhour == 21) and (myminute == 21) and (mysecond == 21)
 	    and (compflag2)) {
 		compflag1 = true;
+#ifdef OFIVECOMP
 		(timeSkewEven) ? timeSkewEven = false : timeSkewEven;
+#endif
 	}
 
 	if ((myhour == 21) and (myminute == 21) and (mysecond == 23)) {
 		compflag1 = false;
 		compflag2 = true;
 	}
+#endif
 }
 
 void loop()
 {
 	unsigned long currentMillis = millis();
 
+#ifdef TIMECOMP
 /*
  * Let's implement time compenstion for individual rtc module time
  * charachteristics. In in my case quartz resonator as inaccurate as
- * about +8.5 seconds per 24 hours
+ * about +9.5 seconds per 24 hours
  */
 	if (compflag1 && compflag2) {
+#ifdef OFIVECOMP
 		if (timeSkewEven) {
 			clock.fillByHMS(myhour, myminute, (mysecond - timeSkew - 1));
 		} else {
+#endif
 			clock.fillByHMS(myhour, myminute, (mysecond - timeSkew));
+#ifdef OFIVECOMP
 		}
+#endif
 
 		clock.setTime();
 		compflag2 = false;
 	}
+#endif
 
 	if (rtcsync) {
 		clock.getTime();
@@ -217,6 +240,7 @@ void loop()
 	    (previousLightTimer > currentMillis)) { // millis() reset every ~49 days
 		previousLightTimer = currentMillis;
 		ambLight = analogRead(photoPin);
+		ambLight = (ambLight + ambLight2 + ambLight3) / 3;
 
 /* Ambient light compensation
  * ambLight can be in range of 0..1023, if it 910+, it has point to use
@@ -248,16 +272,19 @@ void loop()
 		} else if ((ambLight < 350) and (ambLight >= 310)) {
 			Display.setBrightness(-3);
 		} else if ((ambLight < 300) and (ambLight >= 260)) {
-			Display.setBrightness(-5);
+			Display.setBrightness(-6);
 		} else if ((ambLight < 250) and (ambLight >= 210)) {
-			Display.setBrightness(-7);
+			Display.setBrightness(-10);
 		} else if ((ambLight < 200) and (ambLight >= 160)) {
-			Display.setBrightness(-9);
+			Display.setBrightness(-14);
 		} else if ((ambLight < 150) and (ambLight >= 110)) {
-			Display.setBrightness(-12);
+			Display.setBrightness(-18);
 		} else if (ambLight < 100) {
-			Display.setBrightness(-15);
+			Display.setBrightness(-22);
 		}
+
+		ambLight3 = ambLight2;
+		ambLight2 = ambLight;
 	}
 
 	Display.refreshDisplay();
@@ -265,27 +292,16 @@ void loop()
 
 void updateTimeStr(uint8_t h, uint8_t m)
 {
-	char str[4];
-	float d;
-
-	// make blinking dot
-	if (h > 0) {
-		if (dot) {
-			Display.setNumber((h * 100 + m), 2);
-		} else {
-			Display.setNumber((h * 100 + m));
-		}
+	if (dot) {
+		char str[5];
+		sprintf(str, "%2d.%02d", h, m);
+		Display.setChars(str);
 	} else {
-		/* 0 o'clock is an exception, we don't want to see "00.00", we
-		   want see "0.00" or "0 00", so we have to use this "hack" */
-		if (dot) {
-			d = float(m) / 100;
-			Display.setNumber(d, 2);
-		} else {
-			sprintf(str, "%2d%02d", h, m);
-			Display.setChars(str);
-		}
+		char str[4];
+		sprintf(str, "%2d%02d", h, m);
+		Display.setChars(str);
 	}
-	
 }
+
+
 /* vim: set filetype=cpp: */