Raspberry Pi time lapse and pan camera

timelapse.py

#!/usr/bin/env python

import smbus
import calendar
import time
import picamera
import os, errno

wait = 5.0
iso = 100
bus = smbus.SMBus(1)
addr = 0x40
camera = picamera.PiCamera(resolution=(1920, 1080))
photo_dir = '/home/pi/' + str(calendar.timegm(time.gmtime()))

#############################################################
# Functions
#############################################################

def pan(pwm):
        bus.write_word_data(addr, 0x06, 0)
        bus.write_word_data(addr, 0x08, pwm)

def tilt(pwm):
        bus.write_word_data(addr, 0x0a, 0)
        bus.write_word_data(addr, 0x0c, pwm)

def deg2pwm(deg):
        if deg < 0:
                deg = 0
        elif deg > 180:
                deg = 180
        return ((deg * 834) / 180) + 833

#############################################################
# Main
#############################################################

# Create directory for pictures
try:
	os.makedirs(photo_dir)
except OSError as e:
	if e.errno != errno.EEXIST:
		raise

# enable the PC9685 and enable autoincrement
bus.write_byte_data(addr, 0, 0x20)
bus.write_byte_data(addr, 0xfe, 0x1e)

# Set servos to default positions
pan(deg2pwm(0))
tilt(deg2pwm(90))
time.sleep(1)

# Set ISO and let camera automatically set other config
# NOTE: Disabled for all-automatic mode. White balance may change over time.
#print 'Configuring camera'
#camera.iso = iso
#time.sleep(2)
#camera.shutter_speed = camera.exposure_speed
#camera.exposure_mode = 'off'
#g = camera.awb_gains
#camera.awb_mode = 'off'
#camera.awb_gains = g

# Commence timelapse!
print 'Starting timelapse'
for i in range(0, 835):
	pan(i + 833)
	time.sleep(wait / 2)
	filename = photo_dir + '/'
	if i < 10:
		filename += '00'
	elif i < 100:
		filename += '0'
	filename += str(i) + '.jpg' 
	camera.capture(filename)
	time.sleep(wait / 2)