Sync retrieving air quality to whole minutes

clock.py

@@ -337,6 +337,9 @@ class MyClockWidget(FloatLayout):
         else:
             print("Error retrieving air quality; got response " + str(response))
 
+    def sync_air_quality(self, *args):
+        Clock.schedule_interval(self.get_air_quality, 60)
+
     def update_background_automatic_sunrise(self):
         background = self.ids["background"]
         self.draw_list_curr_frame.append(["canvas.clear()", background])
@@ -1568,7 +1571,12 @@ class MyApp(App):
         Clock.schedule_interval(clock_widget.update_display, 1.0/update_rate)
 
         Clock.schedule_once(clock_widget.get_air_quality, 0)
-        Clock.schedule_interval(clock_widget.get_air_quality, 60)
+
+        t = datetime.datetime.now()
+        delay = 60 - (t.second + t.microsecond / 1000000)
+        if delay < 0:
+            delay = delay + 60
+        Clock.schedule_once(clock_widget.sync_air_quality, delay)
 
         if is_arm():
             Window.borderless = True