V2.1

lib/SolarCalculator/examples/SolarTrackingTimeLib/SolarTrackingTimeLib.ino

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+//======================================================================================================================
+// SolarCalculator Library for Arduino example sketch: SolarTrackingTimeLib.ino
+//
+// Monitor the Sun's position in the sky for any location on Earth.
+//
+// Tested with Arduino IDE 1.8.19 and Arduino Uno
+//======================================================================================================================
+
+#include <SolarCalculator.h>
+#include <TimeLib.h>
+
+// Location
+double latitude = 45.55;
+double longitude = -73.633;
+int utc_offset = -5;
+
+// Refresh interval, in seconds
+int interval = 10;
+
+void setup()
+{
+  Serial.begin(9600);
+
+  // Set system time to compile time
+  setTime(toUtc(compileTime()));
+
+  // Set time manually (hr, min, sec, day, mo, yr)
+  //setTime(0, 0, 0, 1, 1, 2022);
+}
+
+void loop()
+{
+  static unsigned long next_millis = 0;
+
+  // At every interval
+  if (millis() > next_millis)
+  {
+    time_t utc = now();
+    double az, el;
+
+    // Calculate the solar position, in degrees
+    calcHorizontalCoordinates(utc, latitude, longitude, az, el);
+
+    // Print results
+    Serial.print(F("Az: "));
+    Serial.print(az);
+    Serial.print(F("°  El: "));
+    Serial.print(el);
+    Serial.println(F("°"));
+
+    next_millis = millis() + interval * 1000L;
+  }
+}
+
+time_t toUtc(time_t local)
+{
+  return local - utc_offset * 3600L;
+}
+
+// Code from JChristensen/Timezone Clock example
+time_t compileTime()
+{
+  const uint8_t COMPILE_TIME_DELAY = 8;
+  const char *compDate = __DATE__, *compTime = __TIME__, *months = "JanFebMarAprMayJunJulAugSepOctNovDec";
+  char chMon[4], *m;
+  tmElements_t tm;
+
+  strncpy(chMon, compDate, 3);
+  chMon[3] = '\0';
+  m = strstr(months, chMon);
+  tm.Month = ((m - months) / 3 + 1);
+
+  tm.Day = atoi(compDate + 4);
+  tm.Year = atoi(compDate + 7) - 1970;
+  tm.Hour = atoi(compTime);
+  tm.Minute = atoi(compTime + 3);
+  tm.Second = atoi(compTime + 6);
+  time_t t = makeTime(tm);
+  return t + COMPILE_TIME_DELAY;
+}