Python beginner opens and closes interlocking camera with Raspberry Pi

title: Security Pi date:2016-08-12 category:raspberry pi tags:raspberry pi,python

Nice to meet you. This is Nioh. I tried Python for the first time and electronic work for the first time. ..

Reason to make

Since we are a micro-enterprise, people who open and close the cash register are currently self-reported. Fortunately, there is no excess or deficiency of cash at present, but I'm still worried when people aren't watching ...

So I wanted to make a camera that opens and closes the cash register.

Why Raspberry Pi

The functions required to make an open / close interlocking camera this time

――I want to post the photos I took on Slack --I want to detect opening and closing (using GPIO) ――I don't know how to link it with the cash register of the mother ship ...

So I used a Raspberry Pi with many examples.

First of all, purchase knowledge

Actually, I didn't even understand Python at all, so I studied on the page python-izm. The rest was googled.

Things necessary

--Raspberry Pi body --SD card (16GB) -LOGICOOL Webcam HD image quality 1.2 million pixels C270 -Amon Open / Close Interlocking Switch 1588 --Breadboard, jumper wire, resistor (1kΩ? I don't know)

principle

1. The door opens
2. The open / close detection switch turns on
3. Take a picture with the webcam 2 seconds after turning on
4. Post the captured image to Slack

I wish I could do it in this way.

Installation of prerequisite applications, etc.

--Pi update

sudo apt-get update
sudo apt-get upgrade

--Installing RPi.GPIO

sudo pip install rpi.gpio

--Installing fswebcam

sudo apt-get install fswebcam

--Installing slacker

sudo pip install slacker

wiring

This time I will use GPIO2.

Slacker settings

I made a surveillance camera with my first Raspberry PI. There is an item of Slacker setting in, so read it and set it. OK if you know the Token and Channel ID It's a good idea to start Python interactively and copy and paste it.

Creating a storage directory

Create a suitable directory for saving

sudo mkdir /home/pi/camera

Write a script

Open it with a suitable name in a suitable editor, copy and paste it, and save it as utf-8. I tried using Atom Editor.

#!/usr/bin/env python
# -*- coding: utf-8 -*-

#Loading the required libraries
import RPi.GPIO as GPIO
from slacker import Slacker
import subprocess
import datetime
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(2,GPIO.IN)

def camcapslack():

    #1 Take a photo with your webcam and save it
    today = datetime.datetime.today()
    now =  today.strftime("%Y%m%d%H%M")
    cmd = "fswebcam [Directory you want to save(/home/pi/camera/etc)]%s.jpg " % now
    jpgdir = "[Directory you want to save(/home/pi/camera/etc)]%s.jpg " % now
    bolean = subprocess.call(cmd, shell=True)
    if bolean == 0:
        pass
    else:
        subprocess.call(cmd,shell=True)

#Post the photos you took to Slack

    token = "[Token ID]"
    slacker = Slacker(token)
    channel = '[channel ID]'
    result = slacker.files.upload(jpgdir,channels=['[channel ID]'])
    slacker.pins.add(channel='[channel ID]',file_=result.body['file']['id'])

while True:

    flag_GPIO = GPIO.input(2)

    if flag_GPIO == 0:
        time.sleep(2)
        camcapslack()

GPIO.cleaup()

All you have to do is register at startup and restart. This may be described later.

Features you want to add in the future

--SD card protection (temporarily use Pi's RAM and delete the image after shooting) --Number of trials when saving failed (Because I didn't know how to do it more than once now) ――Think about whether or not the video is better.

Finally

To be honest, since I first touched Python or the programming language itself, I don't know if I understand all the meanings of this script **

I am new to Atom Editor and I am writing while learning Markdown notation.

I made the current script while fixing it in my own way.

I posted it on Qiita with the hope that it would be easier to understand and that it would be faster, so I would appreciate it if you could point out various things.

Thank you very much.