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#!/usr/bin/env python

import io
import time
import picamera
import picamera.array
import numpy as np
from PIL import Image, ImageDraw

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from __future__ import division

import picamera
import picamera.array
import numpy as np

class MyAnalysis(picamera.array.PiRGBAnalysis):
    def __init__(self, camera):
        super(MyAnalysis, self).__init__(camera)
        self.frame_num = 0

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import picamera
import numpy as np
from picamera.array import PiRGBAnalysis
from picamera.color import Color

class MyColorAnalyzer(PiRGBAnalysis):
    def __init__(self, camera):
        super(MyColorAnalyzer, self).__init__(camera)
        self.last_color = 'none'

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from gpiozero import RyanteckRobot, Button
from signal import pause

robot = RyanteckRobot()

button_actions = {
    Button(26): robot.forward,
    Button(16): robot.left,
    Button(21): robot.right,
    Button(20): robot.backward,

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from gpiozero import LED, MotionSensor, LightSensor
from signal import pause
pir = MotionSensor(21)
ldr = LightSensor(26)
light = LED(25)
def daytime():
    pir.when_motion = None
    pir.when_no_motion = None
    light.off()
def nighttime():

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import ctypes as ct
from signal import pause
import numpy as np

from picamera import mmal, PiRenderer
from picamera.exc import (
    PiCameraRuntimeError,
    PiCameraValueError,
    mmal_check,
    )

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from gpiozero import TrafficLights
from time import sleep
from itertools import cycle, chain
from signal import pause

lights = TrafficLights(12, 16, 19, pwm=True)

def slow(gen):
    for item in gen:
        yield item

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from __future__ import (
    unicode_literals,
    absolute_import,
    print_function,
    division,
    )
str = type('')

from picamera import PiCamera
import curses

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from __future__ import (
    unicode_literals,
    absolute_import,
    print_function,
    division,
    )

from itertools import tee
from collections import deque
from time import sleep

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Delay

The demo script (delay.py) produces a "delayed" preview, with recording facilities. The pot (connected to the MCP3008) is used to control the amount by which the preview is delayed (can vary between 0 and 60 seconds), whilst one button is used to toggle recording (GPIO22), and the other to terminate the script (GPIO17).

Recording is written to "output.h264" in the current directory. This file is wiped when the script starts, and all recording is written to it (i.e. stopping the recording, then starting it again continues the recording from where it left off).