Adding code for traffic light wearable

adding code for the traffic light wearable project.

Author: BlitzCityDIY

Traffic_Light_Wearable/code.py

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+import time
+import board
+import alarm
+from digitalio import DigitalInOut, Direction, Pull
+#  setup pins for the traffic light LEDs
+red_light = DigitalInOut(board.A1)
+yellow_light = DigitalInOut(board.SCL1)
+green_light = DigitalInOut(board.A2)
+#  array of LEDs
+lights = [red_light, yellow_light, green_light]
+#  the traffic light is common anode
+#  the pins will need to be pulled down to ground
+#  to turn on the LEDs. they are setup as inputs
+#  so that the pull can be toggled
+#  Pull.UP turns the LEDs off to start
+for light in lights:
+    light.direction = Direction.INPUT
+    light.pull = Pull.UP
+#  button pin setup
+pin_alarm = alarm.pin.PinAlarm(pin=board.SDA1, value=False, pull=True)
+#  count to track which light is on
+count = 2
+#  tracks the last light
+last_count = 1
+while True:
+    #  increase count by 1, loop through 0-2
+    count = (count+1) % 3
+    #  turn off the last LED
+    lights[last_count].pull = Pull.UP
+    #  turn on the current LED
+    lights[count].pull = Pull.DOWN
+    #  print(count)
+    #  delay to keep count
+    time.sleep(1)
+    #  reset last LED for next loop
+    last_count = count
+    #  go into light sleep mode until button is pressed again
+    alarm.light_sleep_until_alarms(pin_alarm)