using datetime for color change scheduling

Circadian_Pi_Desk_Light/Circadian_Pi_Desk_Light.py

@@ -1,28 +1,49 @@
+import datetime
+import time
 import board
 import neopixel
-import sys
-import datetime
 
 pi_pin = board.D18
 numpix = 144
 brightness = 1.0
-pixels = neopixel.NeoPixel(pi_pin, numpix, brightness=brightness) # Raspberry Pi wiring!
+pixels = neopixel.NeoPixel(pi_pin, numpix, brightness=brightness)
 
-# valid argument check and color assignment
-# morning == blue
-# night == red
-# off == all LEDs off
-if len(sys.argv) == 2:
-    if sys.argv[1] == "morning" :
+# morning BLUE light hours
+# BLUE light is stimulating
+start_morning = "06:00:00"
+end_morning = "10:00:00"
+
+# evening RED light hours
+# RED light is calming allows melatonin production to increase
+start_night = "18:00:00"
+end_night = "22:00:00"
+
+color_change = False
+
+while True:
+    date_string = datetime.datetime.now().strftime("%H:%M:%S" )
+
+    if date_string == start_morning:
         color = (0, 0, 255)
-    elif sys.argv[1] == "night" :
-        color = (255, 0, 0)
-    elif sys.argv[1] == "day" :
-        color = (255, 255, 255)
-    elif sys.argv[1] == "off" :
+        color_change = True
+
+    elif date_string == end_morning:
         color = (0, 0, 0)
+        color_change = True
 
-    pixels.fill(color)
+    elif date_string == start_night:
+        color = (255, 0, 0)
+        color_change = True
 
-else:
-    print("valid arguments are morning, night or off")
+    elif date_string == end_night:
+        color = (0, 0, 0)
+        color_change = True
+
+    else:
+        time.sleep(1)
+
+    # update neopixel strip with new colors
+    if color_change:
+        pixels.fill(color)
+        color_change = False
+        time.sleep(1)