clock.py

#!/usr/bin/python
import RPi.GPIO as GPIO
from datetime import datetime
import time

#https://stackoverflow.com/questions/1969240/mapping-a-range-of-values-to-another
def translate(sensor_val, in_from, in_to, out_from, out_to):
    out_range = out_to - out_from
    in_range = in_to - in_from
    in_val = sensor_val - in_from
    val=(float(in_val)/in_range)*out_range
    out_val = out_from+val
    return out_val

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)
hour = GPIO.PWM(23, 50)
hour.start(4)
GPIO.setup(18, GPIO.OUT)
minute = GPIO.PWM(18, 50)
minute.start(4)
GPIO.setup(25, GPIO.OUT)
second = GPIO.PWM(25, 50)
second.start(4)
GPIO.setup(24, GPIO.OUT)
ampm = GPIO.PWM(24, 50)
ampm.start(4)


while True:
  hour.start(translate(int(datetime.now().strftime("%I")), 0, 12, 0, 7))
  minute.start(translate(int(datetime.now().strftime("%M")), 0, 60, 0, 7))
  second.start(translate(int(datetime.now().strftime("%-S")), 0, 60, 0, 7))
  if datetime.now().strftime("%p") == "PM":
    ampm.start(11.5)
  else:
    ampm.start(0)
  time.sleep(.5)