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Raspberry Pi Embedded Projects Hotshot

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Raspberry Pi Embedded Projects Hotshot

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Raspberry Pi Embedded Projects Hotshot
Feb, 2015 | 250 pages
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Table of Contents (20 chapters)
Raspberry Pi Mechatronics Projects HOTSHOT
Raspberry Pi Mechatronics Projects HOTSHOT
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Hello World
Hello World
A quick introduction to the Raspberry Pi
Where can I buy a Raspberry Pi?
Mission briefing
Hunting and gathering
Setting up the GPIO
GPIO programming using Python
Electrical output of our program
Mission accomplished
Hotshot challenge
2
A Raspberry WebIDE Example
A Raspberry WebIDE Example
Mission briefing
Installation, features, and usage of the Occidentalis operating system from Adafruit
Setup of a remote login into the Raspberry Pi
Installation of the Raspberry Pi WebIDE
Python development on the WebIDE
Test and debugging examples using the WebIDE
Mission accomplished
Hotshot challenge
3
The Arduino Raspberry Pi Interface
The Arduino Raspberry Pi Interface
Mission briefing
Installing the Arduino IDE
Programming the Arduino using the Raspberry Pi
Raspberry Pi AlaMode
The Weasley weather clock
Controlling the stepper using the Arduino
Controlling the RGB LED Strip using the Arduino
I2C Communication using the Arduino (optional)
Serial port communication with the Raspberry Pi
Mission accomplished
Hotshot challenge
4
Christmas Light Sequencer
Christmas Light Sequencer
Mission briefing
Interface the devices to the Raspberry Pi
Setting up the digitally addressable RGB matrix
Interface of an audio device
Installing the web server
Interfacing the web server
Mission accomplished
5
Internet of Things Example – An E-mail Alert Water Fountain
Internet of Things Example – An E-mail Alert Water Fountain
Mission briefing
Installation of the Flask framework
Controlling RGB LEDs from a web page
Setup of the e-mail alerts in the fountain
Mission accomplished
Hotshot challenge
6
Raspberry Pi as a Personal Assistant
Raspberry Pi as a Personal Assistant
Mission briefing
Setting up the e-mail feed parser
Setting up the parser for reminders and events
Designing an enclosure design for the personal assistant
Setting up the assembly for the dish monitor
Setting up sensors for the key alert system
Mission accomplished
Hotshot challenges
References
7
Raspberry Pi-based Line Following Robot
Raspberry Pi-based Line Following Robot
Mission briefing
Assembly of the Pi Plate for the line following robot
Sensor selection, interface, and data interpretation
Implementation of line following logic based on sensor data
Testing the motor driver circuit
Preparation of the line following course
Designing the chassis for the line following robot
A step-by-step assembly of the robot
Mission accomplished
Hotshot challenge
8
Connect Four Desktop Game using Raspberry Pi
Connect Four Desktop Game using Raspberry Pi
Mission briefing
Hello world example with the pygame
Getting started with the Connect Four game (UI and sound effects)
Interfacing game inputs using the PiFace module
A brief description of the Connect Four Game AI
Marquee design and control (optional)
Setup of the switches using a cardboard box
Mission accomplished
Hotshot challenge
9
The Raspberry Pi-enabled Pet/Wildlife Monitor
The Raspberry Pi-enabled Pet/Wildlife Monitor
Mission briefing
Installing and testing the python-twisted framework
Setting up and testing Spark Core to interact with appliances
Installing and testing the Google Coder project on the Raspberry Pi
A brief overview of a bird feeder that triggers a camera
Mission accomplished
Hotshot challenge
10
Raspberry Pi Personal Health Monitor
Raspberry Pi Personal Health Monitor
Mission briefing
Setting up a web server to record health parameters
A simple exercise tool using the Raspberry Pi
Setting up an e-mail feed parser to refill a prescription as well as remind the user about an upcoming doctor's appointment
A simple tool that reminds a person to take his/her pills
Mission accomplished
Hotshot challenge
11
Home Automation using Raspberry Pi
Home Automation using Raspberry Pi
Mission briefing
A simple example that controls limited indoor and outdoor lighting in the evening
A customary web server example
Turning on a lawn sprinkler only when there is no rain forecast!
Mission accomplished
12
Using a Raspberry Pi for Science and Education
Using a Raspberry Pi for Science and Education
Mission briefing
Improving your vocabulary using the Raspberry Pi
Raspberry Pi and Khan Academy
Building a science fair exhibit using the Raspberry Pi
Hotshot challenge
13
Tips and Tricks
Tips and Tricks
Mission briefing
Setting up Raspberry Pi as a development platform
Remotely logging in the Raspberry Pi from anywhere on the Internet
Problems that might be encountered while using Raspberry Pi
Cool add-on hardware sources developed for the Raspberry Pi platform
Project ideas that can be implemented over a weekend
Useful resources for the Raspberry Pi
Mission accomplished
Index
Index

Setting up the assembly for the dish monitor

In this task, we will set up a monitor over the kitchen sink. We will check whether there are dishes in the sink and send LED alerts to the user. Since we have installed OpenCV already, we will get started with the set up of the monitor.

This task was inspired by a hacker based in London who built a dish detector to alert users of a communal kitchen.

Note

The code sample for this function has been borrowed from the OpenCV Dish Detector project by Tom: http://beagleboard.org/blog/2013-11-26-project-spotlight-dirty-dish-detector/

Prepare for lift off

We will get started by mounting a camera on top of the sink and connecting it to an overhead camera, as shown in the following image:

An overhead camera on top of the sink

Engage thrusters

  1. We will get started by importing the OpenCV module:

    import time
import sys
import cv2.cv as cv

  2. We will initialize the camera to capture frames:

    capture = cv.CaptureFromCAM(0)

  3. After initialization, we will grab a frame for processing...

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